release(core): 1.2.30 (#36770)

Ports https://github.com/langchain-ai/langchain/pull/36621

Co-authored-by: Mason Daugherty <mason@langchain.dev>

.github/pr-file-labeler.yml

@@ -1,128 +0,0 @@
-# Label PRs (config)
-# Automatically applies labels based on changed files and branch patterns
-
-# Core packages
-core:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/core/**/*"
-
-langchain-classic:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/langchain/**/*"
-
-langchain:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/langchain_v1/**/*"
-
-standard-tests:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/standard-tests/**/*"
-
-model-profiles:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/model-profiles/**/*"
-
-text-splitters:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/text-splitters/**/*"
-
-# Partner integrations
-integration:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/**/*"
-
-anthropic:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/anthropic/**/*"
-
-chroma:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/chroma/**/*"
-
-deepseek:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/deepseek/**/*"
-
-exa:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/exa/**/*"
-
-fireworks:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/fireworks/**/*"
-
-groq:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/groq/**/*"
-
-huggingface:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/huggingface/**/*"
-
-mistralai:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/mistralai/**/*"
-
-nomic:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/nomic/**/*"
-
-ollama:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/ollama/**/*"
-
-openai:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/openai/**/*"
-
-openrouter:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/openrouter/**/*"
-
-perplexity:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/perplexity/**/*"
-
-qdrant:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/qdrant/**/*"
-
-xai:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "libs/partners/xai/**/*"
-
-github_actions:
-  - changed-files:
-      - any-glob-to-any-file:
-          - ".github/workflows/**/*"
-          - ".github/actions/**/*"
-
-dependencies:
-  - changed-files:
-      - any-glob-to-any-file:
-          - "**/pyproject.toml"
-          - "uv.lock"
-          - "**/requirements*.txt"
-          - "**/poetry.lock"

.github/scripts/check_diff.py

@@ -33,18 +33,22 @@ LANGCHAIN_DIRS = [
     "libs/model-profiles",
 ]
 
+# Packages with VCR cassette-backed integration tests.
+# These get a playback-only CI check to catch stale cassettes.
+VCR_PACKAGES = {
+    "libs/partners/openai",
+}
+
 # When set to True, we are ignoring core dependents
 # in order to be able to get CI to pass for each individual
 # package that depends on core
 # e.g. if you touch core, we don't then add textsplitters/etc to CI
 IGNORE_CORE_DEPENDENTS = False
 
-# ignored partners are removed from dependents
-# but still run if directly edited
+# Ignored partners are removed from dependents but still run if directly edited
 IGNORED_PARTNERS = [
     # remove huggingface from dependents because of CI instability
     # specifically in huggingface jobs
-    # https://github.com/langchain-ai/langchain/issues/25558
     "huggingface",
 ]
 
@@ -128,12 +132,23 @@ def _get_configs_for_single_dir(job: str, dir_: str) -> List[Dict[str, str]]:
         return _get_pydantic_test_configs(dir_)
 
     if job == "codspeed":
-        py_versions = ["3.13"]
-    elif dir_ == "libs/core":
+        # CPU simulation (<1% variance, Valgrind-based) is the default.
+        # Partners with heavy SDK inits use walltime instead to keep CI fast.
+        CODSPEED_WALLTIME_DIRS = {
+            "libs/core",
+            "libs/partners/fireworks",  # ~328s under simulation
+            "libs/partners/openai",  # 6 benchmarks, ~6 min under simulation
+        }
+        mode = "walltime" if dir_ in CODSPEED_WALLTIME_DIRS else "simulation"
+        return [
+            {
+                "working-directory": dir_,
+                "python-version": "3.13",
+                "codspeed-mode": mode,
+            }
+        ]
+    if dir_ == "libs/core":
         py_versions = ["3.10", "3.11", "3.12", "3.13", "3.14"]
-    # custom logic for specific directories
-    elif dir_ in {"libs/partners/chroma"}:
-        py_versions = ["3.10", "3.13"]
     else:
         py_versions = ["3.10", "3.14"]
 
@@ -211,6 +226,14 @@ def _get_configs_for_multi_dirs(
         dirs = list(dirs_to_run["extended-test"])
     elif job == "codspeed":
         dirs = list(dirs_to_run["codspeed"])
+    elif job == "vcr-tests":
+        # Only run VCR tests for packages that have cassettes and are affected
+        all_affected = set(
+            add_dependents(
+                dirs_to_run["test"] | dirs_to_run["extended-test"], dependents
+            )
+        )
+        dirs = [d for d in VCR_PACKAGES if d in all_affected]
     else:
         raise ValueError(f"Unknown job: {job}")
 
@@ -325,6 +348,7 @@ if __name__ == "__main__":
             "dependencies",
             "test-pydantic",
             "codspeed",
+            "vcr-tests",
         ]
     }
 

.github/scripts/get_min_versions.py

@@ -48,7 +48,7 @@ def get_pypi_versions(package_name: str) -> List[str]:
         KeyError: If package not found or response format unexpected
     """
     pypi_url = f"https://pypi.org/pypi/{package_name}/json"
-    response = requests.get(pypi_url)
+    response = requests.get(pypi_url, timeout=10.0)
     response.raise_for_status()
     return list(response.json()["releases"].keys())
 

.github/scripts/pr-labeler-config.json

@@ -0,0 +1,84 @@
+{
+  "trustedThreshold": 5,
+  "labelColor": "b76e79",
+  "sizeThresholds": [
+    { "label": "size: XS", "max": 50 },
+    { "label": "size: S", "max": 200 },
+    { "label": "size: M", "max": 500 },
+    { "label": "size: L", "max": 1000 },
+    { "label": "size: XL" }
+  ],
+  "excludedFiles": ["uv.lock"],
+  "excludedPaths": ["docs/"],
+  "typeToLabel": {
+    "feat": "feature",
+    "fix": "fix",
+    "docs": "documentation",
+    "style": "linting",
+    "refactor": "refactor",
+    "perf": "performance",
+    "test": "tests",
+    "build": "infra",
+    "ci": "infra",
+    "chore": "infra",
+    "revert": "revert",
+    "release": "release",
+    "hotfix": "hotfix",
+    "breaking": "breaking"
+  },
+  "scopeToLabel": {
+    "core": "core",
+    "langchain": "langchain",
+    "langchain-classic": "langchain-classic",
+    "model-profiles": "model-profiles",
+    "standard-tests": "standard-tests",
+    "text-splitters": "text-splitters",
+    "anthropic": "anthropic",
+    "chroma": "chroma",
+    "deepseek": "deepseek",
+    "exa": "exa",
+    "fireworks": "fireworks",
+    "groq": "groq",
+    "huggingface": "huggingface",
+    "mistralai": "mistralai",
+    "nomic": "nomic",
+    "ollama": "ollama",
+    "openai": "openai",
+    "openrouter": "openrouter",
+    "perplexity": "perplexity",
+    "qdrant": "qdrant",
+    "xai": "xai",
+    "deps": "dependencies",
+    "docs": "documentation",
+    "infra": "infra"
+  },
+  "fileRules": [
+    { "label": "core", "prefix": "libs/core/", "skipExcludedFiles": true },
+    { "label": "langchain-classic", "prefix": "libs/langchain/", "skipExcludedFiles": true },
+    { "label": "langchain", "prefix": "libs/langchain_v1/", "skipExcludedFiles": true },
+    { "label": "standard-tests", "prefix": "libs/standard-tests/", "skipExcludedFiles": true },
+    { "label": "model-profiles", "prefix": "libs/model-profiles/", "skipExcludedFiles": true },
+    { "label": "text-splitters", "prefix": "libs/text-splitters/", "skipExcludedFiles": true },
+    { "label": "integration", "prefix": "libs/partners/", "skipExcludedFiles": true },
+    { "label": "anthropic", "prefix": "libs/partners/anthropic/", "skipExcludedFiles": true },
+    { "label": "chroma", "prefix": "libs/partners/chroma/", "skipExcludedFiles": true },
+    { "label": "deepseek", "prefix": "libs/partners/deepseek/", "skipExcludedFiles": true },
+    { "label": "exa", "prefix": "libs/partners/exa/", "skipExcludedFiles": true },
+    { "label": "fireworks", "prefix": "libs/partners/fireworks/", "skipExcludedFiles": true },
+    { "label": "groq", "prefix": "libs/partners/groq/", "skipExcludedFiles": true },
+    { "label": "huggingface", "prefix": "libs/partners/huggingface/", "skipExcludedFiles": true },
+    { "label": "mistralai", "prefix": "libs/partners/mistralai/", "skipExcludedFiles": true },
+    { "label": "nomic", "prefix": "libs/partners/nomic/", "skipExcludedFiles": true },
+    { "label": "ollama", "prefix": "libs/partners/ollama/", "skipExcludedFiles": true },
+    { "label": "openai", "prefix": "libs/partners/openai/", "skipExcludedFiles": true },
+    { "label": "openrouter", "prefix": "libs/partners/openrouter/", "skipExcludedFiles": true },
+    { "label": "perplexity", "prefix": "libs/partners/perplexity/", "skipExcludedFiles": true },
+    { "label": "qdrant", "prefix": "libs/partners/qdrant/", "skipExcludedFiles": true },
+    { "label": "xai", "prefix": "libs/partners/xai/", "skipExcludedFiles": true },
+    { "label": "github_actions", "prefix": ".github/workflows/" },
+    { "label": "github_actions", "prefix": ".github/actions/" },
+    { "label": "dependencies", "suffix": "pyproject.toml" },
+    { "label": "dependencies", "exact": "uv.lock" },
+    { "label": "dependencies", "pattern": "(?:^|/)requirements[^/]*\\.txt$" }
+  ]
+}

.github/scripts/pr-labeler.js

@@ -0,0 +1,278 @@
+// Shared helpers for pr_labeler.yml and tag-external-issues.yml.
+//
+// Usage from actions/github-script (requires actions/checkout first):
+//   const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+const fs = require('fs');
+const path = require('path');
+
+function loadConfig() {
+  const configPath = path.join(__dirname, 'pr-labeler-config.json');
+  let raw;
+  try {
+    raw = fs.readFileSync(configPath, 'utf8');
+  } catch (e) {
+    throw new Error(`Failed to read ${configPath}: ${e.message}`);
+  }
+  let config;
+  try {
+    config = JSON.parse(raw);
+  } catch (e) {
+    throw new Error(`Failed to parse pr-labeler-config.json: ${e.message}`);
+  }
+  const required = [
+    'labelColor', 'sizeThresholds', 'fileRules',
+    'typeToLabel', 'scopeToLabel', 'trustedThreshold',
+    'excludedFiles', 'excludedPaths',
+  ];
+  const missing = required.filter(k => !(k in config));
+  if (missing.length > 0) {
+    throw new Error(`pr-labeler-config.json missing required keys: ${missing.join(', ')}`);
+  }
+  return config;
+}
+
+function init(github, owner, repo, config, core) {
+  if (!core) {
+    throw new Error('init() requires a `core` parameter (e.g., from actions/github-script)');
+  }
+  const {
+    trustedThreshold,
+    labelColor,
+    sizeThresholds,
+    scopeToLabel,
+    typeToLabel,
+    fileRules: fileRulesDef,
+    excludedFiles,
+    excludedPaths,
+  } = config;
+
+  const sizeLabels = sizeThresholds.map(t => t.label);
+  const allTypeLabels = [...new Set(Object.values(typeToLabel))];
+  const tierLabels = ['new-contributor', 'trusted-contributor'];
+
+  // ── Label management ──────────────────────────────────────────────
+
+  async function ensureLabel(name, color = labelColor) {
+    try {
+      await github.rest.issues.getLabel({ owner, repo, name });
+    } catch (e) {
+      if (e.status !== 404) throw e;
+      try {
+        await github.rest.issues.createLabel({ owner, repo, name, color });
+      } catch (createErr) {
+        // 422 = label created by a concurrent run between our get and create
+        if (createErr.status !== 422) throw createErr;
+        core.info(`Label "${name}" creation returned 422 (likely already exists)`);
+      }
+    }
+  }
+
+  // ── Size calculation ──────────────────────────────────────────────
+
+  function getSizeLabel(totalChanged) {
+    for (const t of sizeThresholds) {
+      if (t.max != null && totalChanged < t.max) return t.label;
+    }
+    // Last entry has no max — it's the catch-all
+    return sizeThresholds[sizeThresholds.length - 1].label;
+  }
+
+  function computeSize(files) {
+    const excluded = new Set(excludedFiles);
+    const totalChanged = files.reduce((sum, f) => {
+      const p = f.filename ?? '';
+      const base = p.split('/').pop();
+      if (excluded.has(base)) return sum;
+      for (const prefix of excludedPaths) {
+        if (p.startsWith(prefix)) return sum;
+      }
+      return sum + (f.additions ?? 0) + (f.deletions ?? 0);
+    }, 0);
+    return { totalChanged, sizeLabel: getSizeLabel(totalChanged) };
+  }
+
+  // ── File-based labels ─────────────────────────────────────────────
+
+  function buildFileRules() {
+    return fileRulesDef.map((rule, i) => {
+      let test;
+      if (rule.prefix) test = p => p.startsWith(rule.prefix);
+      else if (rule.suffix) test = p => p.endsWith(rule.suffix);
+      else if (rule.exact) test = p => p === rule.exact;
+      else if (rule.pattern) {
+        const re = new RegExp(rule.pattern);
+        test = p => re.test(p);
+      } else {
+        throw new Error(
+          `fileRules[${i}] (label: "${rule.label}") has no recognized matcher ` +
+          `(expected one of: prefix, suffix, exact, pattern)`
+        );
+      }
+      return { label: rule.label, test, skipExcluded: !!rule.skipExcludedFiles };
+    });
+  }
+
+  function matchFileLabels(files, fileRules) {
+    const rules = fileRules || buildFileRules();
+    const excluded = new Set(excludedFiles);
+    const labels = new Set();
+    for (const rule of rules) {
+      // skipExcluded: ignore files whose basename is in the top-level
+      // "excludedFiles" list (e.g. uv.lock) so lockfile-only changes
+      // don't trigger package labels.
+      const candidates = rule.skipExcluded
+        ? files.filter(f => !excluded.has((f.filename ?? '').split('/').pop()))
+        : files;
+      if (candidates.some(f => rule.test(f.filename ?? ''))) {
+        labels.add(rule.label);
+      }
+    }
+    return labels;
+  }
+
+  // ── Title-based labels ────────────────────────────────────────────
+
+  function matchTitleLabels(title) {
+    const labels = new Set();
+    const m = (title ?? '').match(/^(\w+)(?:\(([^)]+)\))?(!)?:/);
+    if (!m) return { labels, type: null, typeLabel: null, scopes: [], breaking: false };
+
+    const type = m[1].toLowerCase();
+    const scopeStr = m[2] ?? '';
+    const breaking = !!m[3];
+
+    const typeLabel = typeToLabel[type] || null;
+    if (typeLabel) labels.add(typeLabel);
+    if (breaking) labels.add('breaking');
+
+    const scopes = scopeStr.split(',').map(s => s.trim()).filter(Boolean);
+    for (const scope of scopes) {
+      const sl = scopeToLabel[scope];
+      if (sl) labels.add(sl);
+    }
+
+    return { labels, type, typeLabel, scopes, breaking };
+  }
+
+  // ── Org membership ────────────────────────────────────────────────
+
+  async function checkMembership(author, userType) {
+    if (userType === 'Bot') {
+      console.log(`${author} is a Bot — treating as internal`);
+      return { isExternal: false };
+    }
+
+    try {
+      const membership = await github.rest.orgs.getMembershipForUser({
+        org: 'langchain-ai',
+        username: author,
+      });
+      const isExternal = membership.data.state !== 'active';
+      console.log(
+        isExternal
+          ? `${author} has pending membership — treating as external`
+          : `${author} is an active member of langchain-ai`,
+      );
+      return { isExternal };
+    } catch (e) {
+      if (e.status === 404) {
+        console.log(`${author} is not a member of langchain-ai`);
+        return { isExternal: true };
+      }
+      // Non-404 errors (rate limit, auth failure, server error) must not
+      // silently default to external — rethrow to fail the step.
+      throw new Error(
+        `Membership check failed for ${author} (${e.status}): ${e.message}`,
+      );
+    }
+  }
+
+  // ── Contributor analysis ──────────────────────────────────────────
+
+  async function getContributorInfo(contributorCache, author, userType) {
+    if (contributorCache.has(author)) return contributorCache.get(author);
+
+    const { isExternal } = await checkMembership(author, userType);
+
+    let mergedCount = null;
+    if (isExternal) {
+      try {
+        const result = await github.rest.search.issuesAndPullRequests({
+          q: `repo:${owner}/${repo} is:pr is:merged author:"${author}"`,
+          per_page: 1,
+        });
+        mergedCount = result?.data?.total_count ?? null;
+      } catch (e) {
+        if (e?.status !== 422) throw e;
+        core.warning(`Search failed for ${author}; skipping tier.`);
+      }
+    }
+
+    const info = { isExternal, mergedCount };
+    contributorCache.set(author, info);
+    return info;
+  }
+
+  // ── Tier label resolution ───────────────────────────────────────────
+
+  async function applyTierLabel(issueNumber, author, { skipNewContributor = false } = {}) {
+    let mergedCount;
+    try {
+      const result = await github.rest.search.issuesAndPullRequests({
+        q: `repo:${owner}/${repo} is:pr is:merged author:"${author}"`,
+        per_page: 1,
+      });
+      mergedCount = result?.data?.total_count;
+    } catch (error) {
+      if (error?.status !== 422) throw error;
+      core.warning(`Search failed for ${author}; skipping tier label.`);
+      return;
+    }
+
+    if (mergedCount == null) {
+      core.warning(`Search response missing total_count for ${author}; skipping tier label.`);
+      return;
+    }
+
+    let tierLabel = null;
+    if (mergedCount >= trustedThreshold) tierLabel = 'trusted-contributor';
+    else if (mergedCount === 0 && !skipNewContributor) tierLabel = 'new-contributor';
+
+    if (tierLabel) {
+      await ensureLabel(tierLabel);
+      await github.rest.issues.addLabels({
+        owner, repo, issue_number: issueNumber, labels: [tierLabel],
+      });
+      console.log(`Applied '${tierLabel}' to #${issueNumber} (${mergedCount} merged PRs)`);
+    } else {
+      console.log(`No tier label for ${author} (${mergedCount} merged PRs)`);
+    }
+
+    return tierLabel;
+  }
+
+  return {
+    ensureLabel,
+    getSizeLabel,
+    computeSize,
+    buildFileRules,
+    matchFileLabels,
+    matchTitleLabels,
+    allTypeLabels,
+    checkMembership,
+    getContributorInfo,
+    applyTierLabel,
+    sizeLabels,
+    tierLabels,
+    trustedThreshold,
+    labelColor,
+  };
+}
+
+function loadAndInit(github, owner, repo, core) {
+  const config = loadConfig();
+  return { config, h: init(github, owner, repo, config, core) };
+}
+
+module.exports = { loadConfig, init, loadAndInit };

.github/scripts/test_release_options.py

@@ -0,0 +1,48 @@
+"""Verify _release.yml dropdown options match actual package directories."""
+
+from pathlib import Path
+
+import yaml
+
+REPO_ROOT = Path(__file__).resolve().parents[2]
+
+
+def _get_release_options() -> list[str]:
+    workflow = REPO_ROOT / ".github" / "workflows" / "_release.yml"
+    with open(workflow) as f:
+        data = yaml.safe_load(f)
+    try:
+        # PyYAML (YAML 1.1) parses the bare key `on` as boolean True
+        return data[True]["workflow_dispatch"]["inputs"]["working-directory"]["options"]
+    except (KeyError, TypeError) as e:
+        msg = f"Could not find workflow_dispatch options in {workflow}: {e}"
+        raise AssertionError(msg) from e
+
+
+def _get_package_dirs() -> set[str]:
+    libs = REPO_ROOT / "libs"
+    dirs: set[str] = set()
+    # Top-level packages (libs/core, libs/langchain, etc.)
+    for p in libs.iterdir():
+        if p.is_dir() and (p / "pyproject.toml").exists():
+            dirs.add(f"libs/{p.name}")
+    # Partner packages (libs/partners/*)
+    partners = libs / "partners"
+    if partners.exists():
+        for p in partners.iterdir():
+            if p.is_dir() and (p / "pyproject.toml").exists():
+                dirs.add(f"libs/partners/{p.name}")
+    return dirs
+
+
+def test_release_options_match_packages() -> None:
+    options = set(_get_release_options())
+    packages = _get_package_dirs()
+    missing_from_dropdown = packages - options
+    extra_in_dropdown = options - packages
+    assert not missing_from_dropdown, (
+        f"Packages on disk missing from _release.yml dropdown: {missing_from_dropdown}"
+    )
+    assert not extra_in_dropdown, (
+        f"Dropdown options with no matching package directory: {extra_in_dropdown}"
+    )

.github/workflows/_compile_integration_test.yml

@@ -35,7 +35,7 @@ jobs:
     timeout-minutes: 20
     name: "Python ${{ inputs.python-version }}"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: "🐍 Set up Python ${{ inputs.python-version }} + UV"
         uses: "./.github/actions/uv_setup"

.github/workflows/_lint.yml

@@ -38,7 +38,7 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: "📋 Checkout Code"
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: "🐍 Set up Python ${{ inputs.python-version }} + UV"
         uses: "./.github/actions/uv_setup"

.github/workflows/_refresh_model_profiles.yml

@@ -0,0 +1,202 @@
+# Reusable workflow: refreshes model profile data for any repo that uses the
+# `langchain-profiles` CLI. Creates (or updates) a pull request with the
+# resulting changes.
+#
+# Callers MUST set `permissions: { contents: write, pull-requests: write }` —
+# reusable workflows cannot escalate the caller's token permissions.
+#
+# ── Example: external repo (langchain-google) ──────────────────────────
+#
+#   jobs:
+#     refresh-profiles:
+#       uses: langchain-ai/langchain/.github/workflows/_refresh_model_profiles.yml@master
+#       with:
+#         providers: >-
+#           [
+#             {"provider":"google",        "data_dir":"libs/genai/langchain_google_genai/data"},
+#           ]
+#       secrets:
+#         MODEL_PROFILE_BOT_APP_ID:      ${{ secrets.MODEL_PROFILE_BOT_APP_ID }}
+#         MODEL_PROFILE_BOT_PRIVATE_KEY: ${{ secrets.MODEL_PROFILE_BOT_PRIVATE_KEY }}
+
+name: "Refresh Model Profiles (reusable)"
+
+on:
+  workflow_call:
+    inputs:
+      providers:
+        description: >-
+          JSON array of objects, each with `provider` (models.dev provider ID)
+          and `data_dir` (path relative to repo root where `_profiles.py` and
+          `profile_augmentations.toml` live).
+        required: true
+        type: string
+      cli-path:
+        description: >-
+          Path (relative to workspace) to an existing `libs/model-profiles`
+          checkout.  When set the workflow skips cloning the langchain repo and
+          uses this directory for the CLI instead.  Useful when the caller IS
+          the langchain monorepo.
+        required: false
+        type: string
+        default: ""
+      cli-ref:
+        description: >-
+          Git ref of langchain-ai/langchain to checkout for the CLI.
+          Ignored when `cli-path` is set.
+        required: false
+        type: string
+        default: master
+      add-paths:
+        description: "Glob for files to stage in the PR commit."
+        required: false
+        type: string
+        default: "**/_profiles.py"
+      pr-branch:
+        description: "Branch name for the auto-created PR."
+        required: false
+        type: string
+        default: bot/refresh-model-profiles
+      pr-title:
+        description: "PR / commit title."
+        required: false
+        type: string
+        default: "chore(model-profiles): refresh model profile data"
+      pr-body:
+        description: "PR body."
+        required: false
+        type: string
+        default: |
+          Automated refresh of model profile data via `langchain-profiles refresh`.
+
+          🤖 Generated by the `refresh_model_profiles` workflow.
+      pr-labels:
+        description: "Comma-separated labels to apply to the PR."
+        required: false
+        type: string
+        default: bot
+    secrets:
+      MODEL_PROFILE_BOT_APP_ID:
+        required: true
+      MODEL_PROFILE_BOT_PRIVATE_KEY:
+        required: true
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  refresh-profiles:
+    name: refresh model profiles
+    runs-on: ubuntu-latest
+    steps:
+      - name: "📋 Checkout"
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: "📋 Checkout langchain-profiles CLI"
+        if: inputs.cli-path == ''
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        with:
+          repository: langchain-ai/langchain
+          ref: ${{ inputs.cli-ref }}
+          sparse-checkout: libs/model-profiles
+          path: _langchain-cli
+
+      - name: "🔧 Resolve CLI directory"
+        id: cli
+        env:
+          CLI_PATH: ${{ inputs.cli-path }}
+        run: |
+          if [ -n "${CLI_PATH}" ]; then
+            resolved="${GITHUB_WORKSPACE}/${CLI_PATH}"
+            if [ ! -d "${resolved}" ]; then
+              echo "::error::cli-path '${CLI_PATH}' does not exist at ${resolved}"
+              exit 1
+            fi
+            echo "dir=${CLI_PATH}" >> "$GITHUB_OUTPUT"
+          else
+            echo "dir=_langchain-cli/libs/model-profiles" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: "🐍 Set up Python + uv"
+        uses: astral-sh/setup-uv@0ca8f610542aa7f4acaf39e65cf4eb3c35091883 # v7
+        with:
+          version: "0.5.25"
+          python-version: "3.12"
+          enable-cache: true
+          cache-dependency-glob: "**/model-profiles/uv.lock"
+
+      - name: "📦 Install langchain-profiles CLI"
+        working-directory: ${{ steps.cli.outputs.dir }}
+        run: uv sync --frozen --no-group test --no-group dev --no-group lint
+
+      - name: "✅ Validate providers input"
+        env:
+          PROVIDERS_JSON: ${{ inputs.providers }}
+        run: |
+          echo "${PROVIDERS_JSON}" | jq -e 'type == "array" and length > 0' > /dev/null || {
+            echo "::error::providers input must be a non-empty JSON array"
+            exit 1
+          }
+          echo "${PROVIDERS_JSON}" | jq -e 'all(has("provider") and has("data_dir"))' > /dev/null || {
+            echo "::error::every entry in providers must have 'provider' and 'data_dir' keys"
+            exit 1
+          }
+
+      - name: "🔄 Refresh profiles"
+        env:
+          PROVIDERS_JSON: ${{ inputs.providers }}
+        run: |
+          cli_dir="${GITHUB_WORKSPACE}/${{ steps.cli.outputs.dir }}"
+          failed=""
+          mapfile -t rows < <(echo "${PROVIDERS_JSON}" | jq -c '.[]')
+          for row in "${rows[@]}"; do
+            provider=$(echo "${row}" | jq -r '.provider')
+            data_dir=$(echo "${row}" | jq -r '.data_dir')
+            echo "--- Refreshing ${provider} -> ${data_dir} ---"
+            if ! echo y | uv run --frozen --project "${cli_dir}" \
+              langchain-profiles refresh \
+              --provider "${provider}" \
+              --data-dir "${GITHUB_WORKSPACE}/${data_dir}"; then
+              echo "::error::Failed to refresh provider: ${provider}"
+              failed="${failed} ${provider}"
+            fi
+          done
+          if [ -n "${failed}" ]; then
+            echo "::error::The following providers failed:${failed}"
+            exit 1
+          fi
+
+      - name: "🔑 Generate GitHub App token"
+        id: app-token
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3
+        with:
+          app-id: ${{ secrets.MODEL_PROFILE_BOT_APP_ID }}
+          private-key: ${{ secrets.MODEL_PROFILE_BOT_PRIVATE_KEY }}
+
+      - name: "🔀 Create pull request"
+        id: create-pr
+        uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # v8
+        with:
+          token: ${{ steps.app-token.outputs.token }}
+          branch: ${{ inputs.pr-branch }}
+          commit-message: ${{ inputs.pr-title }}
+          title: ${{ inputs.pr-title }}
+          body: ${{ inputs.pr-body }}
+          labels: ${{ inputs.pr-labels }}
+          add-paths: ${{ inputs.add-paths }}
+
+      - name: "📝 Summary"
+        if: always()
+        env:
+          PR_OP: ${{ steps.create-pr.outputs.pull-request-operation }}
+          PR_URL: ${{ steps.create-pr.outputs.pull-request-url }}
+          JOB_STATUS: ${{ job.status }}
+        run: |
+          if [ "${PR_OP}" = "created" ] || [ "${PR_OP}" = "updated" ]; then
+            echo "### ✅ PR ${PR_OP}: ${PR_URL}" >> "$GITHUB_STEP_SUMMARY"
+          elif [ -z "${PR_OP}" ] && [ "${JOB_STATUS}" = "success" ]; then
+            echo "### ⏭️ Skipped: profiles already up to date" >> "$GITHUB_STEP_SUMMARY"
+          elif [ "${JOB_STATUS}" = "failure" ]; then
+            echo "### ❌ Job failed — check step logs for details" >> "$GITHUB_STEP_SUMMARY"
+          fi

.github/workflows/_release.yml

@@ -17,9 +17,31 @@ on:
     inputs:
       working-directory:
         required: true
-        type: string
+        type: choice
         description: "From which folder this pipeline executes"
         default: "libs/langchain_v1"
+        options:
+          - libs/core
+          - libs/langchain
+          - libs/langchain_v1
+          - libs/text-splitters
+          - libs/standard-tests
+          - libs/model-profiles
+          - libs/partners/anthropic
+          - libs/partners/chroma
+          - libs/partners/deepseek
+          - libs/partners/exa
+          - libs/partners/fireworks
+          - libs/partners/groq
+          - libs/partners/huggingface
+          - libs/partners/mistralai
+          - libs/partners/nomic
+          - libs/partners/ollama
+          - libs/partners/openai
+          - libs/partners/openrouter
+          - libs/partners/perplexity
+          - libs/partners/qdrant
+          - libs/partners/xai
       release-version:
         required: true
         type: string
@@ -37,7 +59,7 @@ env:
   UV_NO_SYNC: "true"
 
 permissions:
-  contents: write # Required for creating GitHub releases
+  contents: read # Job-level overrides grant write only where needed (mark-release)
 
 jobs:
   # Build the distribution package and extract version info
@@ -54,7 +76,7 @@ jobs:
       version: ${{ steps.check-version.outputs.version }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Python + uv
         uses: "./.github/actions/uv_setup"
@@ -64,6 +86,7 @@ jobs:
       # We want to keep this build stage *separate* from the release stage,
       # so that there's no sharing of permissions between them.
       # (Release stage has trusted publishing and GitHub repo contents write access,
+      # which the build stage must not have access to.)
       #
       # Otherwise, a malicious `build` step (e.g. via a compromised dependency)
       # could get access to our GitHub or PyPI credentials.
@@ -77,7 +100,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
       - name: Upload build
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -107,7 +130,7 @@ jobs:
     outputs:
       release-body: ${{ steps.generate-release-body.outputs.release-body }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           repository: langchain-ai/langchain
           path: langchain
@@ -210,9 +233,9 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -241,7 +264,7 @@ jobs:
       contents: read
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       # We explicitly *don't* set up caching here. This ensures our tests are
       # maximally sensitive to catching breakage.
@@ -262,7 +285,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -273,15 +296,7 @@ jobs:
         env:
           PKG_NAME: ${{ needs.build.outputs.pkg-name }}
           VERSION: ${{ needs.build.outputs.version }}
-        # Here we use:
-        # - The default regular PyPI index as the *primary* index, meaning
-        #   that it takes priority (https://pypi.org/simple)
-        # - The test PyPI index as an extra index, so that any dependencies that
-        #   are not found on test PyPI can be resolved and installed anyway.
-        #   (https://test.pypi.org/simple). This will include the PKG_NAME==VERSION
-        #   package because VERSION will not have been uploaded to regular PyPI yet.
-        # - attempt install again after 5 seconds if it fails because there is
-        #   sometimes a delay in availability on test pypi
+        # Install directly from the locally-built wheel (no index resolution needed)
         run: |
           uv venv
           VIRTUAL_ENV=.venv uv pip install dist/*.whl
@@ -419,7 +434,7 @@ jobs:
       AZURE_OPENAI_EMBEDDINGS_DEPLOYMENT_NAME: ${{ secrets.AZURE_OPENAI_EMBEDDINGS_DEPLOYMENT_NAME }}
       LANGCHAIN_TESTS_USER_AGENT: ${{ secrets.LANGCHAIN_TESTS_USER_AGENT }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       # We implement this conditional as Github Actions does not have good support
       # for conditionally needing steps. https://github.com/actions/runner/issues/491
@@ -437,7 +452,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         if: startsWith(inputs.working-directory, 'libs/core')
         with:
           name: dist
@@ -502,11 +517,11 @@ jobs:
     # No API keys needed for now - deepagents `make test` only runs unit tests
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           path: langchain
 
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           repository: ${{ matrix.package.repo }}
           path: ${{ matrix.package.name }}
@@ -516,7 +531,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           name: dist
           path: dist/
@@ -563,14 +578,14 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Python + uv
         uses: "./.github/actions/uv_setup"
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -592,7 +607,7 @@ jobs:
       - test-pypi-publish
       - pre-release-checks
       - publish
-    # Run if all needed jobs succeeded or were skipped (test-dependents only runs for core/langchain_v1)
+    # Run if all needed jobs succeeded or were skipped
     if: ${{ !cancelled() && !failure() }}
     runs-on: ubuntu-latest
     permissions:
@@ -605,20 +620,20 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Python + uv
         uses: "./.github/actions/uv_setup"
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Create Tag
-        uses: ncipollo/release-action@b7eabc95ff50cbeeedec83973935c8f306dfcd0b # v1
+        uses: ncipollo/release-action@339a81892b84b4eeb0f6e744e4574d79d0d9b8dd # v1
         with:
           artifacts: "dist/*"
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/_test.yml

@@ -33,7 +33,7 @@ jobs:
     name: "Python ${{ inputs.python-version }}"
     steps:
       - name: "📋 Checkout Code"
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: "🐍 Set up Python ${{ inputs.python-version }} + UV"
         uses: "./.github/actions/uv_setup"
@@ -50,7 +50,7 @@ jobs:
       - name: "🧪 Run Core Unit Tests"
         shell: bash
         run: |
-          make test
+          make test PYTEST_EXTRA=-q
 
       - name: "🔍 Calculate Minimum Dependency Versions"
         working-directory: ${{ inputs.working-directory }}
@@ -69,7 +69,7 @@ jobs:
           MIN_VERSIONS: ${{ steps.min-version.outputs.min-versions }}
         run: |
           VIRTUAL_ENV=.venv uv pip install $MIN_VERSIONS
-          make tests
+          make tests PYTEST_EXTRA=-q
         working-directory: ${{ inputs.working-directory }}
 
       - name: "🧹 Verify Clean Working Directory"

.github/workflows/_test_pydantic.yml

@@ -36,7 +36,7 @@ jobs:
     name: "Pydantic ~=${{ inputs.pydantic-version }}"
     steps:
       - name: "📋 Checkout Code"
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: "🐍 Set up Python ${{ inputs.python-version }} + UV"
         uses: "./.github/actions/uv_setup"

.github/workflows/_test_vcr.yml

@@ -0,0 +1,66 @@
+# Runs VCR cassette-backed integration tests in playback-only mode.
+#
+# No API keys needed — catches stale cassettes caused by test input
+# changes without re-recording.
+#
+# Called as part of check_diffs.yml workflow.
+
+name: "📼 VCR Cassette Tests"
+
+on:
+  workflow_call:
+    inputs:
+      working-directory:
+        required: true
+        type: string
+        description: "From which folder this pipeline executes"
+      python-version:
+        required: true
+        type: string
+        description: "Python version to use"
+
+permissions:
+  contents: read
+
+env:
+  UV_FROZEN: "true"
+
+jobs:
+  build:
+    defaults:
+      run:
+        working-directory: ${{ inputs.working-directory }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    name: "Python ${{ inputs.python-version }}"
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: "🐍 Set up Python ${{ inputs.python-version }} + UV"
+        uses: "./.github/actions/uv_setup"
+        with:
+          python-version: ${{ inputs.python-version }}
+          cache-suffix: test-vcr-${{ inputs.working-directory }}
+          working-directory: ${{ inputs.working-directory }}
+
+      - name: "📦 Install Test Dependencies"
+        shell: bash
+        run: uv sync --group test
+
+      - name: "📼 Run VCR Cassette Tests (playback-only)"
+        shell: bash
+        env:
+          OPENAI_API_KEY: sk-fake
+        run: make test_vcr
+
+      - name: "🧹 Verify Clean Working Directory"
+        shell: bash
+        run: |
+          set -eu
+
+          STATUS="$(git status)"
+          echo "$STATUS"
+
+          # grep will exit non-zero if the target message isn't found,
+          # and `set -e` above will cause the step to fail.
+          echo "$STATUS" | grep 'nothing to commit, working tree clean'

.github/workflows/auto-label-by-package.yml

@@ -15,14 +15,20 @@ jobs:
 
     steps:
       - name: Sync package labels
-        uses: actions/github-script@v8
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
         with:
           script: |
             const body = context.payload.issue.body || "";
 
-            // Extract text under "### Package" (handles " (Required)" suffix and being last section)
-            const match = body.match(/### Package[^\n]*\n([\s\S]*?)(?:\n###|$)/i);
-            if (!match) return;
+            // Extract text under "## Package" or "### Package" (handles " (Required)" suffix and being last section)
+            const match = body.match(/#{2,3} Package[^\n]*\n([\s\S]*?)(?:\n#{2,3} |$)/i);
+            if (!match) {
+              core.setFailed(
+                `Could not find "## Package" section in issue #${context.issue.number} body. ` +
+                `The issue template may have changed — update the regex in this workflow.`
+              );
+              return;
+            }
 
             const packageSection = match[1].trim();
 

.github/workflows/check_agents_sync.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "📋 Checkout Code"
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: "🔍 Check CLAUDE.md and AGENTS.md are in sync"
         run: |

.github/workflows/check_core_versions.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: "✅ Verify pyproject.toml & version.py Match"
         run: |

.github/workflows/check_diffs.yml

@@ -8,7 +8,6 @@
 # - Pydantic compatibility tests (_test_pydantic.yml)
 # - Integration test compilation checks (_compile_integration_test.yml)
 # - Extended test suites that require additional dependencies
-# - Codspeed benchmarks (if not labeled 'codspeed-ignore')
 #
 # Reports status to GitHub checks and PR status.
 
@@ -47,9 +46,9 @@ jobs:
     if: ${{ !contains(github.event.pull_request.labels.*.name, 'ci-ignore') }}
     steps:
       - name: "📋 Checkout Code"
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: "🐍 Setup Python 3.11"
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: "3.11"
       - name: "📂 Get Changed Files"
@@ -67,7 +66,7 @@ jobs:
       compile-integration-tests: ${{ steps.set-matrix.outputs.compile-integration-tests }}
       dependencies: ${{ steps.set-matrix.outputs.dependencies }}
       test-pydantic: ${{ steps.set-matrix.outputs.test-pydantic }}
-      codspeed: ${{ steps.set-matrix.outputs.codspeed }}
+      vcr-tests: ${{ steps.set-matrix.outputs.vcr-tests }}
   # Run linting only on packages that have changed files
   lint:
     needs: [build]
@@ -125,6 +124,21 @@ jobs:
       python-version: ${{ matrix.job-configs.python-version }}
     secrets: inherit
 
+  # Run VCR cassette-backed integration tests in playback-only mode (no API keys)
+  vcr-tests:
+    name: "VCR Cassette Tests"
+    needs: [build]
+    if: ${{ needs.build.outputs.vcr-tests != '[]' }}
+    strategy:
+      matrix:
+        job-configs: ${{ fromJson(needs.build.outputs.vcr-tests) }}
+      fail-fast: false
+    uses: ./.github/workflows/_test_vcr.yml
+    with:
+      working-directory: ${{ matrix.job-configs.working-directory }}
+      python-version: ${{ matrix.job-configs.python-version }}
+    secrets: inherit
+
   # Run extended test suites that require additional dependencies
   extended-tests:
     name: "Extended Tests"
@@ -141,7 +155,7 @@ jobs:
       run:
         working-directory: ${{ matrix.job-configs.working-directory }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: "🐍 Set up Python ${{ matrix.job-configs.python-version }} + UV"
         uses: "./.github/actions/uv_setup"
@@ -171,72 +185,20 @@ jobs:
           # and `set -e` above will cause the step to fail.
           echo "$STATUS" | grep 'nothing to commit, working tree clean'
 
-  # Run codspeed benchmarks only on packages that have changed files
-  codspeed:
-    name: "⚡ CodSpeed Benchmarks"
-    needs: [build]
-    if: ${{ needs.build.outputs.codspeed != '[]' && !contains(github.event.pull_request.labels.*.name, 'codspeed-ignore') }}
+  # Verify _release.yml dropdown options stay in sync with package directories
+  check-release-options:
+    name: "Validate Release Options"
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        job-configs: ${{ fromJson(needs.build.outputs.codspeed) }}
-      fail-fast: false
     steps:
-      - uses: actions/checkout@v6
-
-      - name: "📦 Install UV Package Manager"
-        uses: astral-sh/setup-uv@0ca8f610542aa7f4acaf39e65cf4eb3c35091883 # v7
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+      - name: "🐍 Setup Python 3.11"
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
-          # Pinned to 3.13.11 to work around CodSpeed walltime segfault on 3.13.12+
-          # See: https://github.com/CodSpeedHQ/pytest-codspeed/issues/106
-          python-version: "3.13.11"
-
-      - uses: actions/setup-python@v6
-        with:
-          # Pinned to 3.13.11 to work around CodSpeed walltime segfault on 3.13.12+
-          # See: https://github.com/CodSpeedHQ/pytest-codspeed/issues/106
-          python-version: "3.13.11"
-
-      - name: "📦 Install Test Dependencies"
-        run: uv sync --group test
-        working-directory: ${{ matrix.job-configs.working-directory }}
-
-      - name: "⚡ Run Benchmarks: ${{ matrix.job-configs.working-directory }}"
-        uses: CodSpeedHQ/action@a50965600eafa04edcd6717761f55b77e52aafbd # v4
-        env:
-          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
-          ANTHROPIC_FILES_API_IMAGE_ID: ${{ secrets.ANTHROPIC_FILES_API_IMAGE_ID }}
-          ANTHROPIC_FILES_API_PDF_ID: ${{ secrets.ANTHROPIC_FILES_API_PDF_ID }}
-          AZURE_OPENAI_API_VERSION: ${{ secrets.AZURE_OPENAI_API_VERSION }}
-          AZURE_OPENAI_API_BASE: ${{ secrets.AZURE_OPENAI_API_BASE }}
-          AZURE_OPENAI_API_KEY: ${{ secrets.AZURE_OPENAI_API_KEY }}
-          AZURE_OPENAI_CHAT_DEPLOYMENT_NAME: ${{ secrets.AZURE_OPENAI_CHAT_DEPLOYMENT_NAME }}
-          AZURE_OPENAI_LEGACY_CHAT_DEPLOYMENT_NAME: ${{ secrets.AZURE_OPENAI_LEGACY_CHAT_DEPLOYMENT_NAME }}
-          AZURE_OPENAI_LLM_DEPLOYMENT_NAME: ${{ secrets.AZURE_OPENAI_LLM_DEPLOYMENT_NAME }}
-          AZURE_OPENAI_EMBEDDINGS_DEPLOYMENT_NAME: ${{ secrets.AZURE_OPENAI_EMBEDDINGS_DEPLOYMENT_NAME }}
-          COHERE_API_KEY: ${{ secrets.COHERE_API_KEY }}
-          DEEPSEEK_API_KEY: ${{ secrets.DEEPSEEK_API_KEY }}
-          EXA_API_KEY: ${{ secrets.EXA_API_KEY }}
-          FIREWORKS_API_KEY: ${{ secrets.FIREWORKS_API_KEY }}
-          GROQ_API_KEY: ${{ secrets.GROQ_API_KEY }}
-          HUGGINGFACEHUB_API_TOKEN: ${{ secrets.HUGGINGFACEHUB_API_TOKEN }}
-          MISTRAL_API_KEY: ${{ secrets.MISTRAL_API_KEY }}
-          NOMIC_API_KEY: ${{ secrets.NOMIC_API_KEY }}
-          OLLAMA_API_KEY: ${{ secrets.OLLAMA_API_KEY }}
-          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
-          OPENROUTER_API_KEY: ${{ secrets.OPENROUTER_API_KEY }}
-          PPLX_API_KEY: ${{ secrets.PPLX_API_KEY }}
-          XAI_API_KEY: ${{ secrets.XAI_API_KEY }}
-        with:
-          token: ${{ secrets.CODSPEED_TOKEN }}
-          run: |
-            cd ${{ matrix.job-configs.working-directory }}
-            if [ "${{ matrix.job-configs.working-directory }}" = "libs/core" ]; then
-              uv run --no-sync pytest ./tests/benchmarks --codspeed
-            else
-              uv run --no-sync pytest ./tests/ --codspeed
-            fi
-          mode: ${{ matrix.job-configs.working-directory == 'libs/core' && 'walltime' || 'instrumentation' }}
+          python-version: "3.11"
+      - name: "📦 Install Dependencies"
+        run: python -m pip install pyyaml pytest
+      - name: "🔍 Check release dropdown matches packages"
+        run: python -m pytest .github/scripts/test_release_options.py -v
 
   # Final status check - ensures all required jobs passed before allowing merge
   ci_success:
@@ -247,9 +209,10 @@ jobs:
         lint,
         test,
         compile-integration-tests,
+        vcr-tests,
         extended-tests,
         test-pydantic,
-        codspeed,
+        check-release-options,
       ]
     if: |
       always()

.github/workflows/close_unchecked_issues.yml

@@ -0,0 +1,106 @@
+# Auto-close issues that bypass or ignore the issue template checkboxes.
+#
+# GitHub issue forms enforce `required: true` checkboxes in the web UI,
+# but the API bypasses form validation entirely — bots/scripts can open
+# issues with every box unchecked or skip the template altogether.
+#
+# Rules:
+#   1. Checkboxes present, none checked → close
+#   2. No checkboxes at all → close unless author is an org member or bot
+#
+# Org membership check reuses the shared helper from pr-labeler.js and
+# the same GitHub App used by tag-external-issues.yml.
+
+name: Close Unchecked Issues
+
+on:
+  issues:
+    types: [opened]
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.issue.number }}
+  cancel-in-progress: true
+
+jobs:
+  check-boxes:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3
+        with:
+          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
+          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
+
+      - name: Validate issue checkboxes
+        if: steps.app-token.outcome == 'success'
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const body = context.payload.issue.body ?? '';
+            const checked = (body.match(/- \[x\]/gi) || []).length;
+
+            if (checked > 0) {
+              console.log(`Found ${checked} checked checkbox(es) — OK`);
+              return;
+            }
+
+            const unchecked = (body.match(/- \[ \]/g) || []).length;
+
+            // No checkboxes at all — allow org members and bots, close everyone else
+            if (unchecked === 0) {
+              const { owner, repo } = context.repo;
+              const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+              const author = context.payload.sender.login;
+              const { isExternal } = await h.checkMembership(
+                author, context.payload.sender.type,
+              );
+
+              if (!isExternal) {
+                console.log(`No checkboxes, but ${author} is internal — OK`);
+                return;
+              }
+              console.log(`No checkboxes and ${author} is external — closing`);
+            } else {
+              console.log(`Found 0 checked and ${unchecked} unchecked checkbox(es) — closing`);
+            }
+
+            const { owner, repo } = context.repo;
+            const issue_number = context.payload.issue.number;
+
+            const reason = unchecked > 0
+              ? 'none of the required checkboxes were checked'
+              : 'no issue template was used';
+
+            // Close before commenting — a closed issue without a comment is
+            // less confusing than an open issue with a false "auto-closed" message
+            // if the second API call fails.
+            await github.rest.issues.update({
+              owner,
+              repo,
+              issue_number,
+              state: 'closed',
+              state_reason: 'not_planned',
+            });
+
+            await github.rest.issues.createComment({
+              owner,
+              repo,
+              issue_number,
+              body: [
+                `This issue was automatically closed because ${reason}.`,
+                '',
+                `Please use one of the [issue templates](https://github.com/${owner}/${repo}/issues/new/choose) and complete the checklist.`,
+              ].join('\n'),
+            });

.github/workflows/codspeed.yml

@@ -0,0 +1,85 @@
+# CodSpeed performance benchmarks.
+#
+# Runs benchmarks on changed packages and uploads results to CodSpeed.
+# Separated from the main CI workflow so that push-to-master baseline runs
+# are never cancelled by subsequent merges (cancel-in-progress is only
+# enabled for pull_request events).
+
+name: "⚡ CodSpeed"
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+# On PRs, cancel stale runs when new commits are pushed.
+# On push-to-master, never cancel — these runs populate CodSpeed baselines.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'push' && github.sha || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+permissions:
+  contents: read
+
+env:
+  UV_FROZEN: "true"
+  UV_NO_SYNC: "true"
+
+jobs:
+  build:
+    name: "Detect Changes"
+    runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.pull_request.labels.*.name, 'codspeed-ignore') }}
+    steps:
+      - name: "📋 Checkout Code"
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+      - name: "🐍 Setup Python 3.11"
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
+        with:
+          python-version: "3.11"
+      - name: "📂 Get Changed Files"
+        id: files
+        uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
+      - name: "🔍 Analyze Changed Files"
+        id: set-matrix
+        run: |
+          python -m pip install packaging requests
+          python .github/scripts/check_diff.py ${{ steps.files.outputs.all }} >> $GITHUB_OUTPUT
+    outputs:
+      codspeed: ${{ steps.set-matrix.outputs.codspeed }}
+
+  benchmarks:
+    name: "⚡ CodSpeed Benchmarks"
+    needs: [build]
+    if: ${{ needs.build.outputs.codspeed != '[]' }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        job-configs: ${{ fromJson(needs.build.outputs.codspeed) }}
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: "📦 Install UV Package Manager"
+        uses: astral-sh/setup-uv@0ca8f610542aa7f4acaf39e65cf4eb3c35091883 # v7
+        with:
+          # Pinned to 3.13.11 to work around CodSpeed walltime segfault on 3.13.12+
+          # See: https://github.com/CodSpeedHQ/pytest-codspeed/issues/106
+          python-version: "3.13.11"
+
+      - name: "📦 Install Test Dependencies"
+        run: uv sync --group test
+        working-directory: ${{ matrix.job-configs.working-directory }}
+
+      - name: "⚡ Run Benchmarks: ${{ matrix.job-configs.working-directory }}"
+        uses: CodSpeedHQ/action@a50965600eafa04edcd6717761f55b77e52aafbd # v4
+        with:
+          token: ${{ secrets.CODSPEED_TOKEN }}
+          run: |
+            cd ${{ matrix.job-configs.working-directory }}
+            if [ "${{ matrix.job-configs.working-directory }}" = "libs/core" ]; then
+              uv run --no-sync pytest ./tests/benchmarks --codspeed
+            else
+              uv run --no-sync pytest ./tests/unit_tests/ -m benchmark --codspeed
+            fi
+          mode: ${{ matrix.job-configs.codspeed-mode }}

.github/workflows/integration_tests.yml

@@ -92,12 +92,12 @@ jobs:
         working-directory: ${{ fromJSON(needs.compute-matrix.outputs.matrix).working-directory }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           path: langchain
 
       # These libraries exist outside of the monorepo and need to be checked out separately
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           repository: langchain-ai/langchain-google
           path: langchain-google
@@ -106,12 +106,12 @@ jobs:
         uses: google-github-actions/auth@7c6bc770dae815cd3e89ee6cdf493a5fab2cc093 # v3
         with:
           credentials_json: "${{ secrets.GOOGLE_CREDENTIALS }}"
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           repository: langchain-ai/langchain-aws
           path: langchain-aws
       - name: "🔐 Configure AWS Credentials"
-        uses: aws-actions/configure-aws-credentials@fb7eb401298e393da51cdcb2feb1ed0183619014 # v6
+        uses: aws-actions/configure-aws-credentials@8df5847569e6427dd6c4fb1cf565c83acfa8afa7 # v6
         with:
           aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
           aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
@@ -234,11 +234,11 @@ jobs:
             path: libs/deepagents
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           path: langchain
 
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           repository: ${{ matrix.package.repo }}
           path: ${{ matrix.package.name }}

.github/workflows/pr_labeler.yml

@@ -0,0 +1,213 @@
+# Unified PR labeler — applies size, file-based, title-based, and
+# contributor classification labels in a single sequential workflow.
+#
+# Consolidates pr_labeler_file.yml, pr_labeler_title.yml,
+# pr_size_labeler.yml, and PR-handling from tag-external-contributions.yml
+# into one workflow to eliminate race conditions from concurrent label
+# mutations. tag-external-issues.yml remains active for issue-only
+# labeling. Backfill lives in pr_labeler_backfill.yml.
+#
+# Config and shared logic live in .github/scripts/pr-labeler-config.json
+# and .github/scripts/pr-labeler.js — update those when adding partners.
+#
+# Setup Requirements:
+# 1. Create a GitHub App with permissions:
+#    - Repository: Pull requests (write)
+#    - Repository: Issues (write)
+#    - Organization: Members (read)
+# 2. Install the app on your organization and this repository
+# 3. Add these repository secrets:
+#    - ORG_MEMBERSHIP_APP_ID: Your app's ID
+#    - ORG_MEMBERSHIP_APP_PRIVATE_KEY: Your app's private key
+#
+# The GitHub App token is required to check private organization membership
+# and to propagate label events to downstream workflows.
+
+name: "🏷️ PR Labeler"
+
+on:
+  # Safe since we're not checking out or running the PR's code.
+  # NEVER CHECK OUT UNTRUSTED CODE FROM A PR's HEAD IN A pull_request_target JOB.
+  # Doing so would allow attackers to execute arbitrary code in the context of your repository.
+  pull_request_target:
+    types: [opened, synchronize, reopened, edited]
+
+permissions:
+  contents: read
+
+concurrency:
+  # Separate opened events so external/tier labels are never lost to cancellation
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}-${{ github.event.action == 'opened' && 'opened' || 'update' }}
+  cancel-in-progress: ${{ github.event.action != 'opened' }}
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
+
+    steps:
+      # Checks out the BASE branch (safe for pull_request_target — never
+      # the PR head). Needed to load .github/scripts/pr-labeler*.
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Generate GitHub App token
+        if: github.event.action == 'opened'
+        id: app-token
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3
+        with:
+          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
+          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
+
+      - name: Verify App token
+        if: github.event.action == 'opened'
+        run: |
+          if [ -z "${{ steps.app-token.outputs.token }}" ]; then
+            echo "::error::GitHub App token generation failed — cannot classify contributor"
+            exit 1
+          fi
+
+      - name: Check org membership
+        if: github.event.action == 'opened'
+        id: check-membership
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+            const author = context.payload.sender.login;
+            const { isExternal } = await h.checkMembership(
+              author, context.payload.sender.type,
+            );
+            core.setOutput('is-external', isExternal ? 'true' : 'false');
+
+      - name: Apply PR labels
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        env:
+          IS_EXTERNAL: ${{ steps.check-membership.outputs.is-external }}
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { owner, repo } = context.repo;
+            const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+            const pr = context.payload.pull_request;
+            if (!pr) return;
+            const prNumber = pr.number;
+            const action = context.payload.action;
+
+            const toAdd = new Set();
+            const toRemove = new Set();
+
+            const currentLabels = (await github.paginate(
+              github.rest.issues.listLabelsOnIssue,
+              { owner, repo, issue_number: prNumber, per_page: 100 },
+            )).map(l => l.name ?? '');
+
+            // ── Size + file labels (skip on 'edited' — files unchanged) ──
+            if (action !== 'edited') {
+              for (const sl of h.sizeLabels) await h.ensureLabel(sl);
+
+              const files = await github.paginate(github.rest.pulls.listFiles, {
+                owner, repo, pull_number: prNumber, per_page: 100,
+              });
+
+              const { totalChanged, sizeLabel } = h.computeSize(files);
+              toAdd.add(sizeLabel);
+              for (const sl of h.sizeLabels) {
+                if (currentLabels.includes(sl) && sl !== sizeLabel) toRemove.add(sl);
+              }
+              console.log(`Size: ${totalChanged} changed lines → ${sizeLabel}`);
+
+              for (const label of h.matchFileLabels(files)) {
+                toAdd.add(label);
+              }
+            }
+
+            // ── Title-based labels ──
+            const { labels: titleLabels, typeLabel } = h.matchTitleLabels(pr.title || '');
+            for (const label of titleLabels) toAdd.add(label);
+
+            // Remove stale type labels only when a type was detected
+            if (typeLabel) {
+              for (const tl of h.allTypeLabels) {
+                if (currentLabels.includes(tl) && !titleLabels.has(tl)) toRemove.add(tl);
+              }
+            }
+
+            // ── Internal label (only on open, non-external contributors) ──
+            // IS_EXTERNAL is empty string on non-opened events (step didn't
+            // run), so this guard is only true for opened + internal.
+            if (action === 'opened' && process.env.IS_EXTERNAL === 'false') {
+              toAdd.add('internal');
+            }
+
+            // ── Apply changes ──
+            // Ensure all labels we're about to add exist (addLabels returns
+            // 422 if any label in the batch is missing, which would prevent
+            // ALL labels from being applied).
+            for (const name of toAdd) {
+              await h.ensureLabel(name);
+            }
+
+            for (const name of toRemove) {
+              if (toAdd.has(name)) continue;
+              try {
+                await github.rest.issues.removeLabel({
+                  owner, repo, issue_number: prNumber, name,
+                });
+              } catch (e) {
+                if (e.status !== 404) throw e;
+              }
+            }
+
+            const addList = [...toAdd];
+            if (addList.length > 0) {
+              await github.rest.issues.addLabels({
+                owner, repo, issue_number: prNumber, labels: addList,
+              });
+            }
+
+            const removed = [...toRemove].filter(r => !toAdd.has(r));
+            console.log(`PR #${prNumber}: +[${addList.join(', ')}] -[${removed.join(', ')}]`);
+
+      # Apply tier label BEFORE the external label so that
+      # "trusted-contributor" is already present when the "external" labeled
+      # event fires and triggers require_issue_link.yml.
+      - name: Apply contributor tier label
+        if: github.event.action == 'opened' && steps.check-membership.outputs.is-external == 'true'
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+            const pr = context.payload.pull_request;
+            await h.applyTierLabel(pr.number, pr.user.login);
+
+      - name: Add external label
+        if: github.event.action == 'opened' && steps.check-membership.outputs.is-external == 'true'
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          # Use App token so the "labeled" event propagates to downstream
+          # workflows (e.g. require_issue_link.yml). Events created by the
+          # default GITHUB_TOKEN do not trigger additional workflow runs.
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const prNumber = context.payload.pull_request.number;
+
+            const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+            await h.ensureLabel('external');
+            await github.rest.issues.addLabels({
+              owner, repo,
+              issue_number: prNumber,
+              labels: ['external'],
+            });
+            console.log(`Added 'external' label to PR #${prNumber}`);

.github/workflows/pr_labeler_backfill.yml

@@ -0,0 +1,130 @@
+# Backfill PR labels on all open PRs.
+#
+# Manual-only workflow that applies the same labels as pr_labeler.yml
+# (size, file, title, contributor classification) to existing open PRs.
+# Reuses shared logic from .github/scripts/pr-labeler.js.
+
+name: "🏷️ PR Labeler Backfill"
+
+on:
+  workflow_dispatch:
+    inputs:
+      max_items:
+        description: "Maximum number of open PRs to process"
+        default: "100"
+        type: string
+
+permissions:
+  contents: read
+
+jobs:
+  backfill:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3
+        with:
+          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
+          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
+
+      - name: Backfill labels on open PRs
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const rawMax = '${{ inputs.max_items }}';
+            const maxItems = parseInt(rawMax, 10);
+            if (isNaN(maxItems) || maxItems <= 0) {
+              core.setFailed(`Invalid max_items: "${rawMax}" — must be a positive integer`);
+              return;
+            }
+
+            const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+            for (const name of [...h.sizeLabels, ...h.tierLabels]) {
+              await h.ensureLabel(name);
+            }
+
+            const contributorCache = new Map();
+            const fileRules = h.buildFileRules();
+
+            const prs = await github.paginate(github.rest.pulls.list, {
+              owner, repo, state: 'open', per_page: 100,
+            });
+
+            let processed = 0;
+            let failures = 0;
+            for (const pr of prs) {
+              if (processed >= maxItems) break;
+              try {
+                const author = pr.user.login;
+                const info = await h.getContributorInfo(contributorCache, author, pr.user.type);
+                const labels = new Set();
+
+                labels.add(info.isExternal ? 'external' : 'internal');
+                if (info.isExternal && info.mergedCount != null && info.mergedCount >= h.trustedThreshold) {
+                  labels.add('trusted-contributor');
+                } else if (info.isExternal && info.mergedCount === 0) {
+                  labels.add('new-contributor');
+                }
+
+                // Size + file labels
+                const files = await github.paginate(github.rest.pulls.listFiles, {
+                  owner, repo, pull_number: pr.number, per_page: 100,
+                });
+                const { sizeLabel } = h.computeSize(files);
+                labels.add(sizeLabel);
+
+                for (const label of h.matchFileLabels(files, fileRules)) {
+                  labels.add(label);
+                }
+
+                // Title labels
+                const { labels: titleLabels } = h.matchTitleLabels(pr.title ?? '');
+                for (const tl of titleLabels) labels.add(tl);
+
+                // Ensure all labels exist before batch add
+                for (const name of labels) {
+                  await h.ensureLabel(name);
+                }
+
+                // Remove stale managed labels
+                const currentLabels = (await github.paginate(
+                  github.rest.issues.listLabelsOnIssue,
+                  { owner, repo, issue_number: pr.number, per_page: 100 },
+                )).map(l => l.name ?? '');
+
+                const managed = [...h.sizeLabels, ...h.tierLabels, ...h.allTypeLabels];
+                for (const name of currentLabels) {
+                  if (managed.includes(name) && !labels.has(name)) {
+                    try {
+                      await github.rest.issues.removeLabel({
+                        owner, repo, issue_number: pr.number, name,
+                      });
+                    } catch (e) {
+                      if (e.status !== 404) throw e;
+                    }
+                  }
+                }
+
+                await github.rest.issues.addLabels({
+                  owner, repo, issue_number: pr.number, labels: [...labels],
+                });
+                console.log(`PR #${pr.number} (${author}): ${[...labels].join(', ')}`);
+                processed++;
+              } catch (e) {
+                failures++;
+                core.warning(`Failed to process PR #${pr.number}: ${e.message}`);
+              }
+            }
+
+            console.log(`\nBackfill complete. Processed ${processed} PRs, ${failures} failures. ${contributorCache.size} unique authors.`);

.github/workflows/pr_labeler_file.yml

@@ -1,31 +0,0 @@
-# Label PRs based on changed files.
-#
-# See `.github/pr-file-labeler.yml` to see rules for each label/directory.
-
-name: "🏷️ Pull Request Labeler"
-
-on:
-  # Safe since we're not checking out or running the PR's code
-  # Never check out the PR's head in a pull_request_target job
-  pull_request_target:
-    types: [opened, synchronize, reopened]
-
-permissions:
-  contents: read
-
-jobs:
-  labeler:
-    name: "label"
-    permissions:
-      contents: read
-      pull-requests: write
-      issues: write
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Label Pull Request
-        uses: actions/labeler@v6
-        with:
-          repo-token: "${{ secrets.GITHUB_TOKEN }}"
-          configuration-path: .github/pr-file-labeler.yml
-          sync-labels: false

.github/workflows/pr_labeler_title.yml

@@ -1,47 +0,0 @@
-# Label PRs based on their titles.
-#
-# Uses conventional commit types from PR titles to apply labels.
-# Note: Scope-based labeling (e.g., integration labels) is handled by pr_labeler_file.yml
-
-name: "🏷️ PR Title Labeler"
-
-on:
-  # Safe since we're not checking out or running the PR's code
-  # Never check out the PR's head in a pull_request_target job
-  pull_request_target:
-    types: [opened, edited]
-
-permissions:
-  contents: read
-
-jobs:
-  pr-title-labeler:
-    name: "label"
-    permissions:
-      contents: read
-      pull-requests: write
-      issues: write
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Label PR based on title
-        uses: bcoe/conventional-release-labels@b503ca473654e07521c051628c5f1f969e7436da # v1
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          type_labels: >-
-            {
-              "feat": "feature",
-              "fix": "fix",
-              "docs": "documentation",
-              "style": "linting",
-              "refactor": "refactor",
-              "perf": "performance",
-              "test": "tests",
-              "build": "infra",
-              "ci": "infra",
-              "chore": "infra",
-              "revert": "revert",
-              "release": "release",
-              "breaking": "breaking"
-            }
-          ignored_types: '[]'

.github/workflows/pr_lint.yml

@@ -31,7 +31,7 @@
 #   core, langchain, langchain-classic, model-profiles,
 #   standard-tests, text-splitters, docs, anthropic, chroma, deepseek, exa,
 #   fireworks, groq, huggingface, mistralai, nomic, ollama, openai,
-#   perplexity, qdrant, xai, infra, deps
+#   perplexity, qdrant, xai, infra, deps, partners
 #
 # Multiple scopes can be used by separating them with a comma. For example:
 #
@@ -66,6 +66,15 @@ jobs:
     name: "validate format"
     runs-on: ubuntu-latest
     steps:
+      - name: "🚫 Reject empty scope"
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+        run: |
+          if [[ "$PR_TITLE" =~ ^[a-z]+\(\)[!]?: ]]; then
+            echo "::error::PR title has empty scope parentheses: '$PR_TITLE'"
+            echo "Either remove the parentheses or provide a scope (e.g., 'fix(core): ...')."
+            exit 1
+          fi
       - name: "✅ Validate Conventional Commits Format"
         uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6
         env:
@@ -110,6 +119,7 @@ jobs:
             xai
             infra
             deps
+            partners
           requireScope: false
           disallowScopes: |
             release

.github/workflows/pr_size_labeler.yml

@@ -1,174 +0,0 @@
-# Label PRs by size (changed lines, excluding lockfiles and docs).
-#
-# Size thresholds:
-#   XS: < 50, S: < 200, M: < 500, L: < 1000, XL: >= 1000
-
-name: "📏 PR Size Labeler"
-
-on:
-  pull_request_target:
-    types: [opened, synchronize, reopened]
-  workflow_dispatch:
-    inputs:
-      max_items:
-        description: "Maximum number of open PRs to process"
-        default: "100"
-        type: string
-
-permissions:
-  contents: read
-
-jobs:
-  size-label:
-    if: github.event_name != 'workflow_dispatch'
-    runs-on: ubuntu-latest
-    permissions:
-      pull-requests: write
-      issues: write
-
-    steps:
-      - name: Apply PR size label
-        uses: actions/github-script@v8
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            const { owner, repo } = context.repo;
-            const pullRequest = context.payload.pull_request;
-            if (!pullRequest) return;
-
-            const sizeLabels = ['size: XS', 'size: S', 'size: M', 'size: L', 'size: XL'];
-            const labelColor = 'b76e79';
-
-            // Ensure labels exist
-            for (const name of sizeLabels) {
-              try {
-                await github.rest.issues.getLabel({ owner, repo, name });
-              } catch (error) {
-                if (error?.status !== 404) throw error;
-                await github.rest.issues.createLabel({
-                  owner, repo, name, color: labelColor,
-                });
-              }
-            }
-
-            const files = await github.paginate(github.rest.pulls.listFiles, {
-              owner, repo, pull_number: pullRequest.number, per_page: 100,
-            });
-
-            const excludedFiles = new Set(['poetry.lock', 'uv.lock']);
-            const totalChangedLines = files.reduce((total, file) => {
-              const path = file.filename ?? '';
-              if (path.startsWith('docs/') || excludedFiles.has(path)) return total;
-              return total + (file.additions ?? 0) + (file.deletions ?? 0);
-            }, 0);
-
-            let targetSizeLabel = 'size: XL';
-            if (totalChangedLines < 50) targetSizeLabel = 'size: XS';
-            else if (totalChangedLines < 200) targetSizeLabel = 'size: S';
-            else if (totalChangedLines < 500) targetSizeLabel = 'size: M';
-            else if (totalChangedLines < 1000) targetSizeLabel = 'size: L';
-
-            // Remove stale size labels
-            const currentLabels = await github.paginate(
-              github.rest.issues.listLabelsOnIssue,
-              { owner, repo, issue_number: pullRequest.number, per_page: 100 },
-            );
-            for (const label of currentLabels) {
-              const name = label.name ?? '';
-              if (sizeLabels.includes(name) && name !== targetSizeLabel) {
-                await github.rest.issues.removeLabel({
-                  owner, repo, issue_number: pullRequest.number, name,
-                });
-              }
-            }
-
-            await github.rest.issues.addLabels({
-              owner, repo, issue_number: pullRequest.number, labels: [targetSizeLabel],
-            });
-
-            console.log(`PR #${pullRequest.number}: ${totalChangedLines} changed lines → ${targetSizeLabel}`);
-
-  backfill:
-    if: github.event_name == 'workflow_dispatch'
-    runs-on: ubuntu-latest
-    permissions:
-      pull-requests: write
-      issues: write
-
-    steps:
-      - name: Backfill size labels on open PRs
-        uses: actions/github-script@v8
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            const { owner, repo } = context.repo;
-            const maxItems = parseInt('${{ inputs.max_items }}') || 100;
-
-            const sizeLabels = ['size: XS', 'size: S', 'size: M', 'size: L', 'size: XL'];
-            const labelColor = 'b76e79';
-
-            // Ensure labels exist
-            for (const name of sizeLabels) {
-              try {
-                await github.rest.issues.getLabel({ owner, repo, name });
-              } catch (error) {
-                if (error?.status !== 404) throw error;
-                await github.rest.issues.createLabel({
-                  owner, repo, name, color: labelColor,
-                });
-                console.log(`Created label: ${name}`);
-              }
-            }
-
-            function getSizeLabel(totalChangedLines) {
-              if (totalChangedLines < 50) return 'size: XS';
-              if (totalChangedLines < 200) return 'size: S';
-              if (totalChangedLines < 500) return 'size: M';
-              if (totalChangedLines < 1000) return 'size: L';
-              return 'size: XL';
-            }
-
-            const prs = await github.paginate(github.rest.pulls.list, {
-              owner, repo, state: 'open', per_page: 100,
-            });
-
-            let processed = 0;
-            for (const pr of prs) {
-              if (processed >= maxItems) break;
-
-              const files = await github.paginate(github.rest.pulls.listFiles, {
-                owner, repo, pull_number: pr.number, per_page: 100,
-              });
-
-              const excludedFiles = new Set(['poetry.lock', 'uv.lock']);
-              const totalChangedLines = files.reduce((total, file) => {
-                const path = file.filename ?? '';
-                if (path.startsWith('docs/') || excludedFiles.has(path)) return total;
-                return total + (file.additions ?? 0) + (file.deletions ?? 0);
-              }, 0);
-
-              const targetSizeLabel = getSizeLabel(totalChangedLines);
-
-              // Remove stale size labels
-              const currentLabels = await github.paginate(
-                github.rest.issues.listLabelsOnIssue,
-                { owner, repo, issue_number: pr.number, per_page: 100 },
-              );
-              for (const label of currentLabels) {
-                const name = label.name ?? '';
-                if (sizeLabels.includes(name) && name !== targetSizeLabel) {
-                  await github.rest.issues.removeLabel({
-                    owner, repo, issue_number: pr.number, name,
-                  });
-                }
-              }
-
-              await github.rest.issues.addLabels({
-                owner, repo, issue_number: pr.number, labels: [targetSizeLabel],
-              });
-
-              console.log(`PR #${pr.number}: ${totalChangedLines} changed lines → ${targetSizeLabel}`);
-              processed++;
-            }
-
-            console.log(`\nBackfill complete. Processed ${processed} PRs.`);

.github/workflows/refresh_model_profiles.yml

@@ -18,55 +18,28 @@ permissions:
 
 jobs:
   refresh-profiles:
-    name: "refresh all partner profiles"
-    runs-on: ubuntu-latest
-    steps:
-      - name: "📋 Checkout"
-        uses: actions/checkout@v6
+    uses: ./.github/workflows/_refresh_model_profiles.yml
+    with:
+      providers: >-
+        [
+          {"provider":"anthropic",    "data_dir":"libs/partners/anthropic/langchain_anthropic/data"},
+          {"provider":"deepseek",     "data_dir":"libs/partners/deepseek/langchain_deepseek/data"},
+          {"provider":"fireworks-ai", "data_dir":"libs/partners/fireworks/langchain_fireworks/data"},
+          {"provider":"groq",         "data_dir":"libs/partners/groq/langchain_groq/data"},
+          {"provider":"huggingface",  "data_dir":"libs/partners/huggingface/langchain_huggingface/data"},
+          {"provider":"mistral",      "data_dir":"libs/partners/mistralai/langchain_mistralai/data"},
+          {"provider":"openai",       "data_dir":"libs/partners/openai/langchain_openai/data"},
+          {"provider":"openrouter",   "data_dir":"libs/partners/openrouter/langchain_openrouter/data"},
+          {"provider":"perplexity",   "data_dir":"libs/partners/perplexity/langchain_perplexity/data"},
+          {"provider":"xai",          "data_dir":"libs/partners/xai/langchain_xai/data"}
+        ]
+      cli-path: libs/model-profiles
+      add-paths: libs/partners/**/data/_profiles.py
+      pr-body: |
+        Automated refresh of model profile data for all in-monorepo partner
+        integrations via `langchain-profiles refresh`.
 
-      - name: "🐍 Set up Python + uv"
-        uses: ./.github/actions/uv_setup
-        with:
-          python-version: "3.12"
-          working-directory: libs/model-profiles
-
-      - name: "📦 Install langchain-profiles CLI"
-        working-directory: libs/model-profiles
-        run: uv sync
-
-      - name: "🔄 Refresh profiles"
-        working-directory: libs/model-profiles
-        run: make refresh-profiles
-
-      - name: "🔑 Generate GitHub App token"
-        id: app-token
-        uses: actions/create-github-app-token@v2
-        with:
-          app-id: ${{ secrets.MODEL_PROFILE_BOT_APP_ID }}
-          private-key: ${{ secrets.MODEL_PROFILE_BOT_PRIVATE_KEY }}
-
-      - name: "🔀 Create pull request"
-        id: create-pr
-        uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # v8
-        with:
-          token: ${{ steps.app-token.outputs.token }}
-          branch: bot/refresh-model-profiles
-          commit-message: "chore(model-profiles): refresh model profile data"
-          title: "chore(model-profiles): refresh model profile data"
-          body: |
-            Automated refresh of model profile data for all in-monorepo partner
-            integrations via `langchain-profiles refresh`.
-
-            🤖 Generated by the `refresh_model_profiles` workflow.
-          labels: bot
-          add-paths: libs/partners/**/data/_profiles.py
-
-      - name: "📝 Summary"
-        run: |
-          op="${{ steps.create-pr.outputs.pull-request-operation }}"
-          url="${{ steps.create-pr.outputs.pull-request-url }}"
-          if [ "$op" = "created" ] || [ "$op" = "updated" ]; then
-            echo "### ✅ PR ${op}: ${url}" >> "$GITHUB_STEP_SUMMARY"
-          else
-            echo "### ⏭️ Skipped: profiles already up to date" >> "$GITHUB_STEP_SUMMARY"
-          fi
+        🤖 Generated by the `refresh_model_profiles` workflow.
+    secrets:
+      MODEL_PROFILE_BOT_APP_ID: ${{ secrets.MODEL_PROFILE_BOT_APP_ID }}
+      MODEL_PROFILE_BOT_PRIVATE_KEY: ${{ secrets.MODEL_PROFILE_BOT_PRIVATE_KEY }}

.github/workflows/reopen_on_assignment.yml

@@ -0,0 +1,195 @@
+# Reopen PRs that were auto-closed by require_issue_link.yml when the
+# contributor was not assigned to the linked issue. When a maintainer
+# assigns the contributor to the issue, this workflow finds matching
+# closed PRs, verifies the issue link, and reopens them.
+#
+# Uses the default GITHUB_TOKEN (not a PAT or app token) so that the
+# reopen and label-removal events do NOT re-trigger other workflows.
+# GitHub suppresses events created by the default GITHUB_TOKEN within
+# workflow runs to prevent infinite loops.
+
+name: Reopen PR on Issue Assignment
+
+on:
+  issues:
+    types: [assigned]
+
+permissions:
+  contents: read
+
+jobs:
+  reopen-linked-prs:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+      pull-requests: write
+
+    steps:
+      - name: Find and reopen matching PRs
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const issueNumber = context.payload.issue.number;
+            const assignee = context.payload.assignee.login;
+
+            console.log(
+              `Issue #${issueNumber} assigned to ${assignee} — searching for closed PRs to reopen`,
+            );
+
+            const q = [
+              `is:pr`,
+              `is:closed`,
+              `author:${assignee}`,
+              `label:missing-issue-link`,
+              `repo:${owner}/${repo}`,
+            ].join(' ');
+
+            let data;
+            try {
+              ({ data } = await github.rest.search.issuesAndPullRequests({
+                q,
+                per_page: 30,
+              }));
+            } catch (e) {
+              throw new Error(
+                `Failed to search for closed PRs to reopen after assigning ${assignee} ` +
+                `to #${issueNumber} (HTTP ${e.status ?? 'unknown'}): ${e.message}`,
+              );
+            }
+
+            if (data.total_count === 0) {
+              console.log('No matching closed PRs found');
+              return;
+            }
+
+            console.log(`Found ${data.total_count} candidate PR(s)`);
+
+            // Must stay in sync with the identical pattern in require_issue_link.yml
+            const pattern = /(?:close[sd]?|fix(?:e[sd])?|resolve[sd]?)\s*#(\d+)/gi;
+
+            for (const item of data.items) {
+              const prNumber = item.number;
+              const body = item.body || '';
+              const matches = [...body.matchAll(pattern)];
+              const referencedIssues = matches.map(m => parseInt(m[1], 10));
+
+              if (!referencedIssues.includes(issueNumber)) {
+                console.log(`PR #${prNumber} does not reference #${issueNumber} — skipping`);
+                continue;
+              }
+
+              // Skip if already bypassed
+              const labels = item.labels.map(l => l.name);
+              if (labels.includes('bypass-issue-check')) {
+                console.log(`PR #${prNumber} already has bypass-issue-check — skipping`);
+                continue;
+              }
+
+              // Reopen first, remove label second — a closed PR that still has
+              // missing-issue-link is recoverable; a closed PR with the label
+              // stripped is invisible to both workflows.
+              try {
+                await github.rest.pulls.update({
+                  owner,
+                  repo,
+                  pull_number: prNumber,
+                  state: 'open',
+                });
+                console.log(`Reopened PR #${prNumber}`);
+              } catch (e) {
+                if (e.status === 422) {
+                  // Head branch deleted — PR is unrecoverable. Notify the
+                  // contributor so they know to open a new PR.
+                  core.warning(`Cannot reopen PR #${prNumber}: head branch was likely deleted`);
+                  try {
+                    await github.rest.issues.createComment({
+                      owner,
+                      repo,
+                      issue_number: prNumber,
+                      body:
+                        `You have been assigned to #${issueNumber}, but this PR could not be ` +
+                        `reopened because the head branch has been deleted. Please open a new ` +
+                        `PR referencing the issue.`,
+                    });
+                  } catch (commentErr) {
+                    core.warning(
+                      `Also failed to post comment on PR #${prNumber}: ${commentErr.message}`,
+                    );
+                  }
+                  continue;
+                }
+                // Transient errors (rate limit, 5xx) should fail the job so
+                // the label is NOT removed and the run can be retried.
+                throw e;
+              }
+
+              // Remove missing-issue-link label only after successful reopen
+              try {
+                await github.rest.issues.removeLabel({
+                  owner,
+                  repo,
+                  issue_number: prNumber,
+                  name: 'missing-issue-link',
+                });
+                console.log(`Removed missing-issue-link from PR #${prNumber}`);
+              } catch (e) {
+                if (e.status !== 404) throw e;
+              }
+
+              // Minimize stale enforcement comment (best-effort;
+              // sync w/ require_issue_link.yml minimize blocks)
+              try {
+                const marker = '<!-- require-issue-link -->';
+                const comments = await github.paginate(
+                  github.rest.issues.listComments,
+                  { owner, repo, issue_number: prNumber, per_page: 100 },
+                );
+                const stale = comments.find(c => c.body && c.body.includes(marker));
+                if (stale) {
+                  await github.graphql(`
+                    mutation($id: ID!) {
+                      minimizeComment(input: {subjectId: $id, classifier: OUTDATED}) {
+                        minimizedComment { isMinimized }
+                      }
+                    }
+                  `, { id: stale.node_id });
+                  console.log(`Minimized stale enforcement comment ${stale.id} as outdated`);
+                }
+              } catch (e) {
+                core.warning(`Could not minimize stale comment on PR #${prNumber}: ${e.message}`);
+              }
+
+              // Re-run the failed require_issue_link check so it picks up the
+              // new assignment.  The re-run uses the original event payload but
+              // fetches live issue data, so the assignment check will pass.
+              //
+              // Limitation: we look up runs by the PR's current head SHA.  If the
+              // contributor pushed new commits while the PR was closed, head.sha
+              // won't match the SHA of the original failed run and the query will
+              // return 0 results.  This is acceptable because any push after reopen
+              // triggers a fresh require_issue_link run against the new SHA.
+              try {
+                const { data: pr } = await github.rest.pulls.get({
+                  owner, repo, pull_number: prNumber,
+                });
+                const { data: runs } = await github.rest.actions.listWorkflowRuns({
+                  owner, repo,
+                  workflow_id: 'require_issue_link.yml',
+                  head_sha: pr.head.sha,
+                  status: 'failure',
+                  per_page: 1,
+                });
+                if (runs.workflow_runs.length > 0) {
+                  await github.rest.actions.reRunWorkflowFailedJobs({
+                    owner, repo,
+                    run_id: runs.workflow_runs[0].id,
+                  });
+                  console.log(`Re-ran failed require_issue_link run ${runs.workflow_runs[0].id} for PR #${prNumber}`);
+                } else {
+                  console.log(`No failed require_issue_link runs found for PR #${prNumber} — skipping re-run`);
+                }
+              } catch (e) {
+                core.warning(`Could not re-run require_issue_link check for PR #${prNumber} (HTTP ${e.status ?? 'unknown'}): ${e.message}`);
+              }
+            }

.github/workflows/require_issue_link.yml

@@ -1,63 +1,223 @@
-# Require external PRs to link to an approved issue or discussion using
-# GitHub auto-close keywords (Fixes #NNN, Closes #NNN, Resolves #NNN),
-# AND require that the PR author is assigned to the linked issue.
+# Require external PRs to reference an approved issue (e.g. Fixes #NNN) and
+# the PR author to be assigned to that issue. On failure the PR is
+# labeled "missing-issue-link", commented on, and closed.
 #
-# - Reacts to the "external" label applied by tag-external-contributions.yml,
-#   avoiding a duplicate org membership check.
-# - Also re-checks on PR edits/reopens for PRs that already have the label.
-# - Bypasses the check for PRs with the "trusted-contributor" label, and
-#   automatically reopens/cleans up PRs that receive it after enforcement.
-# - Validates the PR author is an assignee on at least one linked issue.
-# - Adds a "missing-issue-link" label on failure; removes it on pass.
-# - Automatically reopens PRs that were closed by this workflow once the
-#   check passes (e.g. author edits the body to add a valid issue link).
-# - Posts a comment explaining the requirement on failure.
-# - Deduplicates comments via an HTML marker so re-runs don't spam.
+# Maintainer override: an org member can reopen the PR or remove
+# "missing-issue-link" — both add "bypass-issue-check" and reopen.
 #
-# Dependency: tag-external-contributions.yml must run first to apply the
-# "external" label on new PRs. Both workflows trigger on pull_request_target
-# opened events; this workflow additionally listens for the "labeled" event
-# to chain off the external classification.
+# Dependency: pr_labeler.yml must apply the "external" label first. This
+# workflow does NOT trigger on "opened" (new PRs have no labels yet, so the
+# gate would always skip).
 
 name: Require Issue Link
 
 on:
   pull_request_target:
-    types: [opened, edited, reopened, labeled]
+    # NEVER CHECK OUT UNTRUSTED CODE FROM A PR's HEAD IN A pull_request_target JOB.
+    # Doing so would allow attackers to execute arbitrary code in the context of your repository.
+    types: [edited, reopened, labeled, unlabeled]
+
+# ──────────────────────────────────────────────────────────────────────────────
+# Enforcement gate: set to 'true' to activate the issue link requirement.
+# When 'false', the workflow still runs the check logic (useful for dry-run
+# visibility) but will NOT label, comment, close, or fail PRs.
+# ──────────────────────────────────────────────────────────────────────────────
+env:
+  ENFORCE_ISSUE_LINK: "true"
 
 permissions:
   contents: read
 
 jobs:
   check-issue-link:
-    # Run when the "external" label is added, or on edit/reopen if already labeled.
-    # Skip entirely when the PR already carries "trusted-contributor".
+    # Run when the "external" label is added, on edit/reopen if already labeled,
+    # or when "missing-issue-link" is removed (triggers maintainer override check).
+    # Skip entirely when the PR already carries "trusted-contributor" or
+    # "bypass-issue-check".
     if: >-
       !contains(github.event.pull_request.labels.*.name, 'trusted-contributor') &&
+      !contains(github.event.pull_request.labels.*.name, 'bypass-issue-check') &&
       (
         (github.event.action == 'labeled' && github.event.label.name == 'external') ||
-        (github.event.action != 'labeled' && contains(github.event.pull_request.labels.*.name, 'external'))
+        (github.event.action == 'unlabeled' && github.event.label.name == 'missing-issue-link' && contains(github.event.pull_request.labels.*.name, 'external')) ||
+        (github.event.action != 'labeled' && github.event.action != 'unlabeled' && contains(github.event.pull_request.labels.*.name, 'external'))
       )
     runs-on: ubuntu-latest
     permissions:
+      actions: write
       pull-requests: write
 
     steps:
       - name: Check for issue link and assignee
         id: check-link
-        uses: actions/github-script@v8
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
         with:
           script: |
             const { owner, repo } = context.repo;
             const prNumber = context.payload.pull_request.number;
+            const action = context.payload.action;
 
-            // Fetch live labels to handle the race where "external" fires
-            // before "trusted-contributor" appears in the event payload.
+            // ── Helper: ensure a label exists, then add it to the PR ────────
+            async function ensureAndAddLabel(labelName, color) {
+              try {
+                await github.rest.issues.getLabel({ owner, repo, name: labelName });
+              } catch (e) {
+                if (e.status !== 404) throw e;
+                try {
+                  await github.rest.issues.createLabel({ owner, repo, name: labelName, color });
+                } catch (createErr) {
+                  // 422 = label was created by a concurrent run between our
+                  // GET and POST — safe to ignore.
+                  if (createErr.status !== 422) throw createErr;
+                }
+              }
+              await github.rest.issues.addLabels({
+                owner, repo, issue_number: prNumber, labels: [labelName],
+              });
+            }
+
+            // ── Helper: check if the user who triggered this event (reopened
+            // the PR / removed the label) has write+ access on the repo ───
+            // Uses the repo collaborator permission endpoint instead of the
+            // org membership endpoint. The org endpoint requires the caller
+            // to be an org member, which GITHUB_TOKEN (an app installation
+            // token) never is — so it always returns 403.
+            async function senderIsOrgMember() {
+              const sender = context.payload.sender?.login;
+              if (!sender) {
+                throw new Error('Event has no sender — cannot check permissions');
+              }
+              try {
+                const { data } = await github.rest.repos.getCollaboratorPermissionLevel({
+                  owner, repo, username: sender,
+                });
+                const perm = data.permission;
+                if (['admin', 'maintain', 'write'].includes(perm)) {
+                  console.log(`${sender} has ${perm} permission — treating as maintainer`);
+                  return { isMember: true, login: sender };
+                }
+                console.log(`${sender} has ${perm} permission — not a maintainer`);
+                return { isMember: false, login: sender };
+              } catch (e) {
+                if (e.status === 404) {
+                  console.log(`Cannot check permissions for ${sender} — treating as non-maintainer`);
+                  return { isMember: false, login: sender };
+                }
+                const status = e.status ?? 'unknown';
+                throw new Error(
+                  `Permission check failed for ${sender} (HTTP ${status}): ${e.message}`,
+                );
+              }
+            }
+
+            // ── Helper: apply maintainer bypass (shared by both override paths) ──
+            async function applyMaintainerBypass(reason) {
+              console.log(reason);
+
+              // Remove missing-issue-link if present
+              try {
+                await github.rest.issues.removeLabel({
+                  owner, repo, issue_number: prNumber, name: 'missing-issue-link',
+                });
+              } catch (e) {
+                if (e.status !== 404) throw e;
+              }
+
+              // Reopen before adding bypass label — a failed reopen is more
+              // actionable than a closed PR with a bypass label stuck on it.
+              if (context.payload.pull_request.state === 'closed') {
+                try {
+                  await github.rest.pulls.update({
+                    owner, repo, pull_number: prNumber, state: 'open',
+                  });
+                  console.log(`Reopened PR #${prNumber}`);
+                } catch (e) {
+                  // 422 if head branch deleted; 403 if permissions insufficient.
+                  // Bypass labels still apply — maintainer can reopen manually.
+                  core.warning(
+                    `Could not reopen PR #${prNumber} (HTTP ${e.status ?? 'unknown'}): ${e.message}. ` +
+                    `Bypass labels were applied — a maintainer may need to reopen manually.`,
+                  );
+                }
+              }
+
+              // Add bypass-issue-check so future triggers skip enforcement
+              await ensureAndAddLabel('bypass-issue-check', '0e8a16');
+
+              // Minimize stale enforcement comment (best-effort; must not
+              // abort bypass — sync w/ reopen_on_assignment.yml & step below)
+              try {
+                const marker = '<!-- require-issue-link -->';
+                const comments = await github.paginate(
+                  github.rest.issues.listComments,
+                  { owner, repo, issue_number: prNumber, per_page: 100 },
+                );
+                const stale = comments.find(c => c.body && c.body.includes(marker));
+                if (stale) {
+                  await github.graphql(`
+                    mutation($id: ID!) {
+                      minimizeComment(input: {subjectId: $id, classifier: OUTDATED}) {
+                        minimizedComment { isMinimized }
+                      }
+                    }
+                  `, { id: stale.node_id });
+                  console.log(`Minimized stale enforcement comment ${stale.id} as outdated`);
+                }
+              } catch (e) {
+                core.warning(`Could not minimize stale comment on PR #${prNumber}: ${e.message}`);
+              }
+
+              core.setOutput('has-link', 'true');
+              core.setOutput('is-assigned', 'true');
+            }
+
+            // ── Maintainer override: removed "missing-issue-link" label ─────
+            if (action === 'unlabeled') {
+              const { isMember, login } = await senderIsOrgMember();
+              if (isMember) {
+                await applyMaintainerBypass(
+                  `Maintainer ${login} removed missing-issue-link from PR #${prNumber} — bypassing enforcement`,
+                );
+                return;
+              }
+              // Non-member removed the label — re-add it defensively and
+              // set failure outputs so downstream steps (comment, close) fire.
+              // NOTE: addLabels fires a "labeled" event, but the job-level gate
+              // only matches labeled events for "external", so no re-trigger.
+              console.log(`Non-member ${login} removed missing-issue-link — re-adding`);
+              try {
+                await ensureAndAddLabel('missing-issue-link', 'b76e79');
+              } catch (e) {
+                core.warning(
+                  `Failed to re-add missing-issue-link (HTTP ${e.status ?? 'unknown'}): ${e.message}. ` +
+                  `Downstream step will retry.`,
+                );
+              }
+              core.setOutput('has-link', 'false');
+              core.setOutput('is-assigned', 'false');
+              return;
+            }
+
+            // ── Maintainer override: reopened PR with "missing-issue-link" ──
+            const prLabels = context.payload.pull_request.labels.map(l => l.name);
+            if (action === 'reopened' && prLabels.includes('missing-issue-link')) {
+              const { isMember, login } = await senderIsOrgMember();
+              if (isMember) {
+                await applyMaintainerBypass(
+                  `Maintainer ${login} reopened PR #${prNumber} — bypassing enforcement`,
+                );
+                return;
+              }
+              console.log(`Non-member ${login} reopened PR — proceeding with check`);
+            }
+
+            // ── Fetch live labels (race guard) ──────────────────────────────
             const { data: liveLabels } = await github.rest.issues.listLabelsOnIssue({
               owner, repo, issue_number: prNumber,
             });
-            if (liveLabels.some(l => l.name === 'trusted-contributor')) {
-              console.log('PR has trusted-contributor label — bypassing issue link check');
+            const liveNames = liveLabels.map(l => l.name);
+            if (liveNames.includes('trusted-contributor') || liveNames.includes('bypass-issue-check')) {
+              console.log('PR has trusted-contributor or bypass-issue-check label — bypassing');
               core.setOutput('has-link', 'true');
               core.setOutput('is-assigned', 'true');
               return;
@@ -80,7 +240,14 @@ jobs:
 
             // Check whether the PR author is assigned to at least one linked issue
             const prAuthor = context.payload.pull_request.user.login;
-            const issueNumbers = [...new Set(matches.map(m => parseInt(m[1], 10)))];
+            const MAX_ISSUES = 5;
+            const allIssueNumbers = [...new Set(matches.map(m => parseInt(m[1], 10)))];
+            const issueNumbers = allIssueNumbers.slice(0, MAX_ISSUES);
+            if (allIssueNumbers.length > MAX_ISSUES) {
+              core.warning(
+                `PR references ${allIssueNumbers.length} issues — only checking the first ${MAX_ISSUES}`,
+              );
+            }
 
             let assignedToAny = false;
             for (const num of issueNumbers) {
@@ -97,26 +264,55 @@ jobs:
                   console.log(`PR author "${prAuthor}" is NOT assigned to #${num} (assignees: ${assignees.join(', ') || 'none'})`);
                 }
               } catch (error) {
-                console.log(`Could not fetch issue #${num}: ${error.message}`);
+                if (error.status === 404) {
+                  console.log(`Issue #${num} not found — skipping`);
+                } else {
+                  // Non-404 errors (rate limit, server error) must not be
+                  // silently skipped — they could cause false enforcement
+                  // (closing a legitimate PR whose assignment can't be verified).
+                  throw new Error(
+                    `Cannot verify assignee for issue #${num} (${error.status}): ${error.message}`,
+                  );
+                }
               }
             }
 
             core.setOutput('is-assigned', assignedToAny ? 'true' : 'false');
 
       - name: Add missing-issue-link label
-        if: steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true'
-        uses: actions/github-script@v8
+        if: >-
+          env.ENFORCE_ISSUE_LINK == 'true' &&
+          (steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true')
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
         with:
           script: |
             const { owner, repo } = context.repo;
             const prNumber = context.payload.pull_request.number;
+            const labelName = 'missing-issue-link';
+
+            // Ensure the label exists (no checkout/shared helper available)
+            try {
+              await github.rest.issues.getLabel({ owner, repo, name: labelName });
+            } catch (e) {
+              if (e.status !== 404) throw e;
+              try {
+                await github.rest.issues.createLabel({
+                  owner, repo, name: labelName, color: 'b76e79',
+                });
+              } catch (createErr) {
+                if (createErr.status !== 422) throw createErr;
+              }
+            }
+
             await github.rest.issues.addLabels({
-              owner, repo, issue_number: prNumber, labels: ['missing-issue-link'],
+              owner, repo, issue_number: prNumber, labels: [labelName],
             });
 
       - name: Remove missing-issue-link label and reopen PR
-        if: steps.check-link.outputs.has-link == 'true' && steps.check-link.outputs.is-assigned == 'true'
-        uses: actions/github-script@v8
+        if: >-
+          env.ENFORCE_ISSUE_LINK == 'true' &&
+          steps.check-link.outputs.has-link == 'true' && steps.check-link.outputs.is-assigned == 'true'
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
         with:
           script: |
             const { owner, repo } = context.repo;
@@ -129,7 +325,9 @@ jobs:
               if (error.status !== 404) throw error;
             }
 
-            // Reopen PR only if it was previously closed by this workflow
+            // Reopen if this workflow previously closed the PR. We check the
+            // event payload labels (not live labels) because we already removed
+            // missing-issue-link above; the payload still reflects pre-step state.
             const labels = context.payload.pull_request.labels.map(l => l.name);
             if (context.payload.pull_request.state === 'closed' && labels.includes('missing-issue-link')) {
               await github.rest.pulls.update({
@@ -141,9 +339,34 @@ jobs:
               console.log(`Reopened PR #${prNumber}`);
             }
 
+            // Minimize stale enforcement comment (best-effort;
+            // sync w/ applyMaintainerBypass above & reopen_on_assignment.yml)
+            try {
+              const marker = '<!-- require-issue-link -->';
+              const comments = await github.paginate(
+                github.rest.issues.listComments,
+                { owner, repo, issue_number: prNumber, per_page: 100 },
+              );
+              const stale = comments.find(c => c.body && c.body.includes(marker));
+              if (stale) {
+                await github.graphql(`
+                  mutation($id: ID!) {
+                    minimizeComment(input: {subjectId: $id, classifier: OUTDATED}) {
+                      minimizedComment { isMinimized }
+                    }
+                  }
+                `, { id: stale.node_id });
+                console.log(`Minimized stale enforcement comment ${stale.id} as outdated`);
+              }
+            } catch (e) {
+              core.warning(`Could not minimize stale comment on PR #${prNumber}: ${e.message}`);
+            }
+
       - name: Post comment, close PR, and fail
-        if: steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true'
-        uses: actions/github-script@v8
+        if: >-
+          env.ENFORCE_ISSUE_LINK == 'true' &&
+          (steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true')
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
         with:
           script: |
             const { owner, repo } = context.repo;
@@ -162,6 +385,8 @@ jobs:
                 '1. Find or [open an issue](https://github.com/' + owner + '/' + repo + '/issues/new/choose) describing the change',
                 '2. Wait for a maintainer to approve and assign you',
                 '3. Add `Fixes #<issue_number>`, `Closes #<issue_number>`, or `Resolves #<issue_number>` to your PR description and the PR will be reopened automatically',
+                '',
+                '*Maintainers: reopen this PR or remove the `missing-issue-link` label to bypass this check.*',
               ];
             } else {
               lines = [
@@ -170,7 +395,9 @@ jobs:
                 '',
                 'External contributors must be assigned to an issue before opening a PR for it. Please:',
                 '1. Comment on the linked issue to request assignment from a maintainer',
-                '2. Once assigned, edit your PR description and the PR will be reopened automatically',
+                '2. Once assigned, your PR will be reopened automatically',
+                '',
+                '*Maintainers: reopen this PR or remove the `missing-issue-link` label to bypass this check.*',
               ];
             }
 
@@ -214,39 +441,27 @@ jobs:
               console.log(`Closed PR #${prNumber}`);
             }
 
+            // Cancel all other in-progress and queued workflow runs for this PR
+            const headSha = context.payload.pull_request.head.sha;
+            for (const status of ['in_progress', 'queued']) {
+              const runs = await github.paginate(
+                github.rest.actions.listWorkflowRunsForRepo,
+                { owner, repo, head_sha: headSha, status, per_page: 100 },
+              );
+              for (const run of runs) {
+                if (run.id === context.runId) continue;
+                try {
+                  await github.rest.actions.cancelWorkflowRun({
+                    owner, repo, run_id: run.id,
+                  });
+                  console.log(`Cancelled ${status} run ${run.id} (${run.name})`);
+                } catch (err) {
+                  console.log(`Could not cancel run ${run.id}: ${err.message}`);
+                }
+              }
+            }
+
             const reason = !hasLink
               ? 'PR must reference an issue using auto-close keywords (e.g., "Fixes #123").'
               : 'PR author must be assigned to the linked issue.';
             core.setFailed(reason);
-
-  # When a trusted-contributor label is added to a PR that was previously
-  # closed by check-issue-link, clean up and reopen it.
-  bypass-trusted-contributor:
-    if: github.event.action == 'labeled' && github.event.label.name == 'trusted-contributor'
-    runs-on: ubuntu-latest
-    permissions:
-      pull-requests: write
-
-    steps:
-      - name: Remove missing-issue-link label and reopen PR
-        uses: actions/github-script@v8
-        with:
-          script: |
-            const { owner, repo } = context.repo;
-            const prNumber = context.payload.pull_request.number;
-
-            try {
-              await github.rest.issues.removeLabel({
-                owner, repo, issue_number: prNumber, name: 'missing-issue-link',
-              });
-              console.log('Removed missing-issue-link label');
-            } catch (error) {
-              if (error.status !== 404) throw error;
-            }
-
-            if (context.payload.pull_request.state === 'closed') {
-              await github.rest.pulls.update({
-                owner, repo, pull_number: prNumber, state: 'open',
-              });
-              console.log(`Reopened PR #${prNumber}`);
-            }

.github/workflows/tag-external-contributions.yml

@@ -1,421 +0,0 @@
-# Automatically tag issues and pull requests as "external" or "internal"
-# based on whether the author is a member of the langchain-ai
-# GitHub organization, and apply contributor tier labels to external
-# contributors based on their merged PR history.
-#
-# Setup Requirements:
-# 1. Create a GitHub App with permissions:
-#    - Repository: Issues (write), Pull requests (write)
-#    - Organization: Members (read)
-# 2. Install the app on your organization and this repository
-# 3. Add these repository secrets:
-#    - ORG_MEMBERSHIP_APP_ID: Your app's ID
-#    - ORG_MEMBERSHIP_APP_PRIVATE_KEY: Your app's private key
-#
-# The GitHub App token is required to check private organization membership.
-# Without it, the workflow will fail.
-#
-# Contributor tier thresholds:
-#   - trusted-contributor: >= 5 merged PRs
-
-name: Tag External Contributions
-
-on:
-  issues:
-    types: [opened]
-  pull_request_target:
-    types: [opened]
-  workflow_dispatch:
-    inputs:
-      backfill_type:
-        description: "Backfill type (for initial run)"
-        default: "both"
-        type: choice
-        options:
-          - prs
-          - issues
-          - both
-      max_items:
-        description: "Maximum number of items to process"
-        default: "100"
-        type: string
-
-permissions:
-  contents: read
-
-jobs:
-  tag-external:
-    if: github.event_name != 'workflow_dispatch'
-    runs-on: ubuntu-latest
-    permissions:
-      issues: write
-      pull-requests: write
-
-    steps:
-      - name: Generate GitHub App token
-        id: app-token
-        uses: actions/create-github-app-token@v2
-        with:
-          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
-          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
-
-      - name: Check if contributor is external
-        id: check-membership
-        uses: actions/github-script@v8
-        with:
-          github-token: ${{ steps.app-token.outputs.token }}
-          script: |
-            const { owner, repo } = context.repo;
-            const author = context.payload.sender.login;
-
-            // GitHub App bots (e.g. model-profile-bot) are not org members
-            // but should be treated as internal — skip the membership check.
-            const senderType = context.payload.sender.type;
-            if (senderType === 'Bot') {
-              console.log(`Sender ${author} is a Bot — treating as internal`);
-              core.setOutput('is-external', 'false');
-              return;
-            }
-
-            try {
-              // Check if the author is a member of the langchain-ai organization
-              // This requires org:read permissions to see private memberships
-              const membership = await github.rest.orgs.getMembershipForUser({
-                org: 'langchain-ai',
-                username: author
-              });
-
-              // Check if membership is active (not just pending invitation)
-              if (membership.data.state === 'active') {
-                console.log(`User ${author} is an active member of langchain-ai organization`);
-                core.setOutput('is-external', 'false');
-              } else {
-                console.log(`User ${author} has pending membership in langchain-ai organization`);
-                core.setOutput('is-external', 'true');
-              }
-            } catch (error) {
-              if (error.status === 404) {
-                console.log(`User ${author} is not a member of langchain-ai organization`);
-                core.setOutput('is-external', 'true');
-              } else {
-                console.error('Error checking membership:', error);
-                console.log('Status:', error.status);
-                console.log('Message:', error.message);
-                // If we can't determine membership due to API error, assume external for safety
-                core.setOutput('is-external', 'true');
-              }
-            }
-
-      # Apply tier label BEFORE the external/internal labels so that
-      # "trusted-contributor" is already present when the "external" labeled
-      # event fires and triggers require_issue_link.yml.
-      - name: Apply contributor tier label
-        if: steps.check-membership.outputs.is-external == 'true'
-        uses: actions/github-script@v8
-        with:
-          # Use App token so the "labeled" event propagates to downstream
-          # workflows (e.g. require_issue_link.yml bypass-trusted-contributor).
-          github-token: ${{ steps.app-token.outputs.token }}
-          script: |
-            const { owner, repo } = context.repo;
-            const isPR = context.eventName === 'pull_request_target';
-            const item = isPR
-              ? context.payload.pull_request
-              : context.payload.issue;
-            const author = item.user.login;
-            const issueNumber = item.number;
-
-            const TRUSTED_THRESHOLD = 5;
-
-            const mergedQuery = `repo:${owner}/${repo} is:pr is:merged author:"${author}"`;
-            let mergedCount = 0;
-            try {
-              const result = await github.rest.search.issuesAndPullRequests({
-                q: mergedQuery,
-                per_page: 1,
-              });
-              mergedCount = result?.data?.total_count ?? 0;
-            } catch (error) {
-              if (error?.status !== 422) throw error;
-              core.warning(`Search failed for ${author}; skipping tier label.`);
-              return;
-            }
-
-            const label = mergedCount >= TRUSTED_THRESHOLD ? 'trusted-contributor' : null;
-
-            if (label) {
-              await github.rest.issues.addLabels({
-                owner,
-                repo,
-                issue_number: issueNumber,
-                labels: [label],
-              });
-              console.log(`Applied '${label}' to #${issueNumber} (${mergedCount} merged PRs)`);
-            } else {
-              console.log(`No tier label for ${author} (${mergedCount} merged PRs)`);
-            }
-
-      - name: Add external label to issue
-        if: steps.check-membership.outputs.is-external == 'true' && github.event_name == 'issues'
-        uses: actions/github-script@v8
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            const { owner, repo } = context.repo;
-            const issue_number = context.payload.issue.number;
-
-            await github.rest.issues.addLabels({
-              owner,
-              repo,
-              issue_number,
-              labels: ['external']
-            });
-
-            console.log(`Added 'external' label to issue #${issue_number}`);
-
-      - name: Add external label to pull request
-        if: steps.check-membership.outputs.is-external == 'true' && github.event_name == 'pull_request_target'
-        uses: actions/github-script@v8
-        with:
-          # Use App token so the "labeled" event propagates to downstream
-          # workflows (e.g. require_issue_link.yml). Events created by the
-          # default GITHUB_TOKEN do not trigger additional workflow runs.
-          github-token: ${{ steps.app-token.outputs.token }}
-          script: |
-            const { owner, repo } = context.repo;
-            const pull_number = context.payload.pull_request.number;
-
-            await github.rest.issues.addLabels({
-              owner,
-              repo,
-              issue_number: pull_number,
-              labels: ['external']
-            });
-
-            console.log(`Added 'external' label to pull request #${pull_number}`);
-
-      - name: Add internal label to issue
-        if: steps.check-membership.outputs.is-external == 'false' && github.event_name == 'issues'
-        uses: actions/github-script@v8
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            const { owner, repo } = context.repo;
-            const issue_number = context.payload.issue.number;
-
-            await github.rest.issues.addLabels({
-              owner,
-              repo,
-              issue_number,
-              labels: ['internal']
-            });
-
-            console.log(`Added 'internal' label to issue #${issue_number}`);
-
-      - name: Add internal label to pull request
-        if: steps.check-membership.outputs.is-external == 'false' && github.event_name == 'pull_request_target'
-        uses: actions/github-script@v8
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            const { owner, repo } = context.repo;
-            const pull_number = context.payload.pull_request.number;
-
-            await github.rest.issues.addLabels({
-              owner,
-              repo,
-              issue_number: pull_number,
-              labels: ['internal']
-            });
-
-            console.log(`Added 'internal' label to pull request #${pull_number}`);
-
-  backfill:
-    if: github.event_name == 'workflow_dispatch'
-    runs-on: ubuntu-latest
-    permissions:
-      issues: write
-      pull-requests: write
-
-    steps:
-      - name: Generate GitHub App token
-        id: app-token
-        uses: actions/create-github-app-token@v2
-        with:
-          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
-          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
-
-      - name: Backfill labels
-        uses: actions/github-script@v8
-        with:
-          github-token: ${{ steps.app-token.outputs.token }}
-          script: |
-            const { owner, repo } = context.repo;
-            const maxItems = parseInt('${{ inputs.max_items }}') || 100;
-            const backfillType = '${{ inputs.backfill_type }}';
-
-            const TRUSTED_THRESHOLD = 5;
-            const LABEL_COLOR = 'b76e79';
-
-            const sizeLabels = ['size: XS', 'size: S', 'size: M', 'size: L', 'size: XL'];
-            const tierLabels = ['trusted-contributor'];
-
-            // Ensure tier and size labels exist
-            for (const name of [...tierLabels, ...sizeLabels]) {
-              try {
-                await github.rest.issues.getLabel({ owner, repo, name });
-              } catch (error) {
-                if (error?.status !== 404) throw error;
-                await github.rest.issues.createLabel({
-                  owner, repo, name, color: LABEL_COLOR,
-                });
-                console.log(`Created label: ${name}`);
-              }
-            }
-
-            // Cache: author -> { isExternal, mergedCount }
-            const contributorCache = new Map();
-
-            async function getContributorInfo(author, userType) {
-              if (contributorCache.has(author)) return contributorCache.get(author);
-
-              // Bots are always internal
-              if (userType === 'Bot') {
-                const info = { isExternal: false, mergedCount: 0 };
-                contributorCache.set(author, info);
-                return info;
-              }
-
-              let isExternal = true;
-              try {
-                const membership = await github.rest.orgs.getMembershipForUser({
-                  org: 'langchain-ai',
-                  username: author,
-                });
-                isExternal = membership.data.state !== 'active';
-              } catch (error) {
-                if (error.status !== 404) {
-                  core.warning(`Membership check failed for ${author}: ${error.message}`);
-                }
-              }
-
-              let mergedCount = 0;
-              if (isExternal) {
-                try {
-                  const result = await github.rest.search.issuesAndPullRequests({
-                    q: `repo:${owner}/${repo} is:pr is:merged author:"${author}"`,
-                    per_page: 1,
-                  });
-                  mergedCount = result?.data?.total_count ?? 0;
-                } catch (error) {
-                  if (error?.status !== 422) throw error;
-                  core.warning(`Search failed for ${author}; skipping tier.`);
-                }
-              }
-
-              const info = { isExternal, mergedCount };
-              contributorCache.set(author, info);
-              return info;
-            }
-
-            function getTierLabel(mergedCount) {
-              return mergedCount >= TRUSTED_THRESHOLD ? 'trusted-contributor' : null;
-            }
-
-            function getSizeLabel(totalChangedLines) {
-              if (totalChangedLines < 50) return 'size: XS';
-              if (totalChangedLines < 200) return 'size: S';
-              if (totalChangedLines < 500) return 'size: M';
-              if (totalChangedLines < 1000) return 'size: L';
-              return 'size: XL';
-            }
-
-            async function removeStaleLabels(issueNumber, labelsToKeep, labelSets) {
-              const currentLabels = await github.paginate(
-                github.rest.issues.listLabelsOnIssue,
-                { owner, repo, issue_number: issueNumber, per_page: 100 },
-              );
-              for (const label of currentLabels) {
-                const name = label.name ?? '';
-                const inManagedSet = labelSets.some((s) => s.includes(name));
-                if (inManagedSet && !labelsToKeep.includes(name)) {
-                  await github.rest.issues.removeLabel({
-                    owner, repo, issue_number: issueNumber, name,
-                  });
-                }
-              }
-            }
-
-            let processed = 0;
-
-            // Backfill PRs
-            if (backfillType === 'prs' || backfillType === 'both') {
-              const prs = await github.paginate(github.rest.pulls.list, {
-                owner, repo, state: 'open', per_page: 100,
-              });
-
-              for (const pr of prs) {
-                if (processed >= maxItems) break;
-                const author = pr.user.login;
-                const info = await getContributorInfo(author, pr.user.type);
-
-                const labels = [];
-                labels.push(info.isExternal ? 'external' : 'internal');
-
-                if (info.isExternal) {
-                  const tier = getTierLabel(info.mergedCount);
-                  if (tier) labels.push(tier);
-                }
-
-                // Compute size label
-                const files = await github.paginate(github.rest.pulls.listFiles, {
-                  owner, repo, pull_number: pr.number, per_page: 100,
-                });
-                const excludedFiles = new Set(['poetry.lock', 'uv.lock']);
-                const totalChangedLines = files.reduce((total, file) => {
-                  const path = file.filename ?? '';
-                  if (path.startsWith('docs/') || excludedFiles.has(path)) return total;
-                  return total + (file.additions ?? 0) + (file.deletions ?? 0);
-                }, 0);
-                labels.push(getSizeLabel(totalChangedLines));
-
-                await removeStaleLabels(pr.number, labels, [sizeLabels, tierLabels]);
-                await github.rest.issues.addLabels({
-                  owner, repo, issue_number: pr.number, labels,
-                });
-                console.log(`PR #${pr.number} (${author}): ${labels.join(', ')}`);
-                processed++;
-              }
-            }
-
-            // Backfill issues
-            if (backfillType === 'issues' || backfillType === 'both') {
-              const issues = await github.paginate(github.rest.issues.listForRepo, {
-                owner, repo, state: 'open', per_page: 100,
-              });
-
-              for (const issue of issues) {
-                if (processed >= maxItems) break;
-                if (issue.pull_request) continue;
-
-                const author = issue.user.login;
-                const info = await getContributorInfo(author, issue.user.type);
-
-                const labels = [];
-                labels.push(info.isExternal ? 'external' : 'internal');
-
-                if (info.isExternal) {
-                  const tier = getTierLabel(info.mergedCount);
-                  if (tier) labels.push(tier);
-                }
-
-                await removeStaleLabels(issue.number, labels, [tierLabels]);
-                await github.rest.issues.addLabels({
-                  owner, repo, issue_number: issue.number, labels,
-                });
-                console.log(`Issue #${issue.number} (${author}): ${labels.join(', ')}`);
-                processed++;
-              }
-            }
-
-            console.log(`\nBackfill complete. Processed ${processed} items. Cache hits: ${contributorCache.size} unique authors.`);

.github/workflows/tag-external-issues.yml

@@ -0,0 +1,205 @@
+# Automatically tag issues as "external" or "internal" based on whether
+# the author is a member of the langchain-ai GitHub organization, and
+# apply contributor tier labels to external contributors based on their
+# merged PR history.
+#
+# NOTE: PR labeling (including external/internal, tier, size, file, and
+# title labels) is handled by pr_labeler.yml. This workflow handles
+# issues only.
+#
+# Config (trustedThreshold, labelColor) is read from
+# .github/scripts/pr-labeler-config.json to stay in sync with
+# pr_labeler.yml.
+#
+# Setup Requirements:
+# 1. Create a GitHub App with permissions:
+#    - Repository: Issues (write)
+#    - Organization: Members (read)
+# 2. Install the app on your organization and this repository
+# 3. Add these repository secrets:
+#    - ORG_MEMBERSHIP_APP_ID: Your app's ID
+#    - ORG_MEMBERSHIP_APP_PRIVATE_KEY: Your app's private key
+#
+# The GitHub App token is required to check private organization membership.
+# Without it, the workflow will fail.
+
+name: Tag External Issues
+
+on:
+  issues:
+    types: [opened]
+  workflow_dispatch:
+    inputs:
+      max_items:
+        description: "Maximum number of open issues to process"
+        default: "100"
+        type: string
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.issue.number || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  tag-external:
+    if: github.event_name != 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3
+        with:
+          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
+          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
+
+      - name: Check if contributor is external
+        if: steps.app-token.outcome == 'success'
+        id: check-membership
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+            const author = context.payload.sender.login;
+            const { isExternal } = await h.checkMembership(
+              author, context.payload.sender.type,
+            );
+            core.setOutput('is-external', isExternal ? 'true' : 'false');
+
+      - name: Apply contributor tier label
+        if: steps.check-membership.outputs.is-external == 'true'
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          # GITHUB_TOKEN is fine here — no downstream workflow chains
+          # off tier labels on issues (unlike PRs where App token is
+          # needed for require_issue_link.yml).
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { owner, repo } = context.repo;
+            const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+            const issue = context.payload.issue;
+            // new-contributor is only meaningful on PRs, not issues
+            await h.applyTierLabel(issue.number, issue.user.login, { skipNewContributor: true });
+
+      - name: Add external/internal label
+        if: steps.check-membership.outputs.is-external != ''
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { owner, repo } = context.repo;
+            const issue_number = context.payload.issue.number;
+
+            const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+            const label = '${{ steps.check-membership.outputs.is-external }}' === 'true'
+              ? 'external' : 'internal';
+            await h.ensureLabel(label);
+            await github.rest.issues.addLabels({
+              owner, repo, issue_number, labels: [label],
+            });
+            console.log(`Added '${label}' label to issue #${issue_number}`);
+
+  backfill:
+    if: github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3
+        with:
+          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
+          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
+
+      - name: Backfill labels on open issues
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        with:
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const rawMax = '${{ inputs.max_items }}';
+            const maxItems = parseInt(rawMax, 10);
+            if (isNaN(maxItems) || maxItems <= 0) {
+              core.setFailed(`Invalid max_items: "${rawMax}" — must be a positive integer`);
+              return;
+            }
+
+            const { h } = require('./.github/scripts/pr-labeler.js').loadAndInit(github, owner, repo, core);
+
+            const tierLabels = ['trusted-contributor'];
+            for (const name of tierLabels) {
+              await h.ensureLabel(name);
+            }
+
+            const contributorCache = new Map();
+
+            const issues = await github.paginate(github.rest.issues.listForRepo, {
+              owner, repo, state: 'open', per_page: 100,
+            });
+
+            let processed = 0;
+            let failures = 0;
+            for (const issue of issues) {
+              if (processed >= maxItems) break;
+              if (issue.pull_request) continue;
+
+              try {
+                const author = issue.user.login;
+                const info = await h.getContributorInfo(contributorCache, author, issue.user.type);
+
+                const labels = [info.isExternal ? 'external' : 'internal'];
+                if (info.isExternal && info.mergedCount != null && info.mergedCount >= h.trustedThreshold) {
+                  labels.push('trusted-contributor');
+                }
+
+                // Ensure all labels exist before batch add
+                for (const name of labels) {
+                  await h.ensureLabel(name);
+                }
+
+                // Remove stale tier labels
+                const currentLabels = (await github.paginate(
+                  github.rest.issues.listLabelsOnIssue,
+                  { owner, repo, issue_number: issue.number, per_page: 100 },
+                )).map(l => l.name ?? '');
+                for (const name of currentLabels) {
+                  if (tierLabels.includes(name) && !labels.includes(name)) {
+                    try {
+                      await github.rest.issues.removeLabel({
+                        owner, repo, issue_number: issue.number, name,
+                      });
+                    } catch (e) {
+                      if (e.status !== 404) throw e;
+                    }
+                  }
+                }
+
+                await github.rest.issues.addLabels({
+                  owner, repo, issue_number: issue.number, labels,
+                });
+                console.log(`Issue #${issue.number} (${author}): ${labels.join(', ')}`);
+                processed++;
+              } catch (e) {
+                failures++;
+                core.warning(`Failed to process issue #${issue.number}: ${e.message}`);
+              }
+            }
+
+            console.log(`\nBackfill complete. Processed ${processed} issues, ${failures} failures. ${contributorCache.size} unique authors.`);

.github/workflows/v03_api_doc_build.yml

@@ -26,12 +26,12 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           ref: v0.3
           path: langchain
 
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           repository: langchain-ai/langchain-api-docs-html
           path: langchain-api-docs-html
@@ -39,7 +39,7 @@ jobs:
 
       - name: "📋 Extract Repository List with yq"
         id: get-unsorted-repos
-        uses: mikefarah/yq@88a31ae8c6b34aad77d2efdecc146113cb3315d0 # master
+        uses: mikefarah/yq@17f66dc6c6a177fafd8b71a6abea6d6340aa1e16 # master
         with:
           cmd: |
             # Extract repos from packages.yml that are in the langchain-ai org
@@ -94,7 +94,7 @@ jobs:
           done
 
       - name: "🐍 Setup Python ${{ env.PYTHON_VERSION }}"
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         id: setup-python
         with:
           python-version: ${{ env.PYTHON_VERSION }}
@@ -161,7 +161,7 @@ jobs:
           rm -rf ../langchain-api-docs-html/_build/
 
       # Commit and push changes to langchain-api-docs-html repo
-      - uses: EndBug/add-and-commit@a94899bca583c204427a224a7af87c02f9b325d5 # v9
+      - uses: EndBug/add-and-commit@290ea2c423ad77ca9c62ae0f5b224379612c0321 # v10.0.0
         with:
           cwd: langchain-api-docs-html
           message: "Update API docs build from v0.3 branch"

AGENTS.md

@@ -44,7 +44,7 @@ This monorepo uses `uv` for dependency management. Local development uses editab
 
 Each package in `libs/` has its own `pyproject.toml` and `uv.lock`.
 
-Before running your tests, setup all packages by running:
+Before running your tests, set up all packages by running:
 
 ```bash
 # For all groups
@@ -229,10 +229,10 @@ Releases are triggered manually via `.github/workflows/_release.yml` with `worki
 
 **Auto-labeling:**
 
-- `.github/workflows/pr_labeler_file.yml`
-- `.github/workflows/pr_labeler_title.yml`
-- `.github/workflows/auto-label-by-package.yml`
-- `.github/workflows/tag-external-contributions.yml`
+- `.github/workflows/pr_labeler.yml` – Unified PR labeler (size, file, title, external/internal, contributor tier)
+- `.github/workflows/pr_labeler_backfill.yml` – Manual backfill of PR labels on open PRs
+- `.github/workflows/auto-label-by-package.yml` – Issue labeling by package
+- `.github/workflows/tag-external-issues.yml` – Issue external/internal classification
 
 ### Adding a new partner to CI
 
@@ -240,7 +240,7 @@ When adding a new partner package, update these files:
 
 - `.github/ISSUE_TEMPLATE/*.yml` – Add to package dropdown
 - `.github/dependabot.yml` – Add dependency update entry
-- `.github/pr-file-labeler.yml` – Add file-to-label mapping
+- `.github/scripts/pr-labeler-config.json` – Add file rule and scope-to-label mapping
 - `.github/workflows/_release.yml` – Add API key secrets if needed
 - `.github/workflows/auto-label-by-package.yml` – Add package label
 - `.github/workflows/check_diffs.yml` – Add to change detection

CLAUDE.md

@@ -44,7 +44,7 @@ This monorepo uses `uv` for dependency management. Local development uses editab
 
 Each package in `libs/` has its own `pyproject.toml` and `uv.lock`.
 
-Before running your tests, setup all packages by running:
+Before running your tests, set up all packages by running:
 
 ```bash
 # For all groups
@@ -229,10 +229,10 @@ Releases are triggered manually via `.github/workflows/_release.yml` with `worki
 
 **Auto-labeling:**
 
-- `.github/workflows/pr_labeler_file.yml`
-- `.github/workflows/pr_labeler_title.yml`
-- `.github/workflows/auto-label-by-package.yml`
-- `.github/workflows/tag-external-contributions.yml`
+- `.github/workflows/pr_labeler.yml` – Unified PR labeler (size, file, title, external/internal, contributor tier)
+- `.github/workflows/pr_labeler_backfill.yml` – Manual backfill of PR labels on open PRs
+- `.github/workflows/auto-label-by-package.yml` – Issue labeling by package
+- `.github/workflows/tag-external-issues.yml` – Issue external/internal classification
 
 ### Adding a new partner to CI
 
@@ -240,7 +240,7 @@ When adding a new partner package, update these files:
 
 - `.github/ISSUE_TEMPLATE/*.yml` – Add to package dropdown
 - `.github/dependabot.yml` – Add dependency update entry
-- `.github/pr-file-labeler.yml` – Add file-to-label mapping
+- `.github/scripts/pr-labeler-config.json` – Add file rule and scope-to-label mapping
 - `.github/workflows/_release.yml` – Add API key secrets if needed
 - `.github/workflows/auto-label-by-package.yml` – Add package label
 - `.github/workflows/check_diffs.yml` – Add to change detection

README.md

@@ -1,8 +1,8 @@
 <div align="center">
-  <a href="https://www.langchain.com/">
+  <a href="https://docs.langchain.com/oss/python/langchain/overview">
     <picture>
-      <source media="(prefers-color-scheme: light)" srcset=".github/images/logo-light.svg">
       <source media="(prefers-color-scheme: dark)" srcset=".github/images/logo-dark.svg">
+      <source media="(prefers-color-scheme: light)" srcset=".github/images/logo-light.svg">
       <img alt="LangChain Logo" src=".github/images/logo-dark.svg" width="50%">
     </picture>
   </a>
@@ -16,23 +16,60 @@
   <a href="https://opensource.org/licenses/MIT" target="_blank"><img src="https://img.shields.io/pypi/l/langchain" alt="PyPI - License"></a>
   <a href="https://pypistats.org/packages/langchain" target="_blank"><img src="https://img.shields.io/pepy/dt/langchain" alt="PyPI - Downloads"></a>
   <a href="https://pypi.org/project/langchain/#history" target="_blank"><img src="https://img.shields.io/pypi/v/langchain?label=%20" alt="Version"></a>
-  <a href="https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url=https://github.com/langchain-ai/langchain" target="_blank"><img src="https://img.shields.io/static/v1?label=Dev%20Containers&message=Open&color=blue&logo=visualstudiocode" alt="Open in Dev Containers"></a>
-  <a href="https://codespaces.new/langchain-ai/langchain" target="_blank"><img src="https://github.com/codespaces/badge.svg" alt="Open in Github Codespace" title="Open in Github Codespace" width="150" height="20"></a>
-  <a href="https://codspeed.io/langchain-ai/langchain" target="_blank"><img src="https://img.shields.io/endpoint?url=https://codspeed.io/badge.json" alt="CodSpeed Badge"></a>
   <a href="https://x.com/langchain" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a>
 </div>
 
-LangChain is a framework for building agents and LLM-powered applications. It helps you chain together interoperable components and third-party integrations to simplify AI application development – all while future-proofing decisions as the underlying technology evolves.
+<br>
+
+LangChain is a framework for building agents and LLM-powered applications. It helps you chain together interoperable components and third-party integrations to simplify AI application development — all while future-proofing decisions as the underlying technology evolves.
+
+> [!NOTE]
+> Looking for the JS/TS library? Check out [LangChain.js](https://github.com/langchain-ai/langchainjs).
+
+## Quickstart
 
 ```bash
 pip install langchain
+# or
+uv add langchain
+```
+
+```python
+from langchain.chat_models import init_chat_model
+
+model = init_chat_model("openai:gpt-5.4")
+result = model.invoke("Hello, world!")
 ```
 
 If you're looking for more advanced customization or agent orchestration, check out [LangGraph](https://docs.langchain.com/oss/python/langgraph/overview), our framework for building controllable agent workflows.
 
+> [!TIP]
+> For developing, debugging, and deploying AI agents and LLM applications, see [LangSmith](https://docs.langchain.com/langsmith/home).
+
+## LangChain ecosystem
+
+While the LangChain framework can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools when building LLM applications.
+
+- **[Deep Agents](https://github.com/langchain-ai/deepagents)** — Build agents that can plan, use subagents, and leverage file systems for complex tasks
+- **[LangGraph](https://docs.langchain.com/oss/python/langgraph/overview)** — Build agents that can reliably handle complex tasks with our low-level agent orchestration framework
+- **[Integrations](https://docs.langchain.com/oss/python/integrations/providers/overview)** — Chat & embedding models, tools & toolkits, and more
+- **[LangSmith](https://www.langchain.com/langsmith)** — Agent evals, observability, and debugging for LLM apps
+- **[LangSmith Deployment](https://docs.langchain.com/langsmith/deployments)** — Deploy and scale agents with a purpose-built platform for long-running, stateful workflows
+
+## Why use LangChain?
+
+LangChain helps developers build applications powered by LLMs through a standard interface for models, embeddings, vector stores, and more.
+
+- **Real-time data augmentation** — Easily connect LLMs to diverse data sources and external/internal systems, drawing from LangChain's vast library of integrations with model providers, tools, vector stores, retrievers, and more
+- **Model interoperability** — Swap models in and out as your engineering team experiments to find the best choice for your application's needs. As the industry frontier evolves, adapt quickly — LangChain's abstractions keep you moving without losing momentum
+- **Rapid prototyping** — Quickly build and iterate on LLM applications with LangChain's modular, component-based architecture. Test different approaches and workflows without rebuilding from scratch, accelerating your development cycle
+- **Production-ready features** — Deploy reliable applications with built-in support for monitoring, evaluation, and debugging through integrations like LangSmith. Scale with confidence using battle-tested patterns and best practices
+- **Vibrant community and ecosystem** — Leverage a rich ecosystem of integrations, templates, and community-contributed components. Benefit from continuous improvements and stay up-to-date with the latest AI developments through an active open-source community
+- **Flexible abstraction layers** — Work at the level of abstraction that suits your needs — from high-level chains for quick starts to low-level components for fine-grained control. LangChain grows with your application's complexity
+
 ---
 
-**Documentation**:
+## Documentation
 
 - [docs.langchain.com](https://docs.langchain.com/oss/python/langchain/overview) – Comprehensive documentation, including conceptual overviews and guides
 - [reference.langchain.com/python](https://reference.langchain.com/python) – API reference docs for LangChain packages
@@ -40,37 +77,8 @@ If you're looking for more advanced customization or agent orchestration, check
 
 **Discussions**: Visit the [LangChain Forum](https://forum.langchain.com) to connect with the community and share all of your technical questions, ideas, and feedback.
 
-> [!NOTE]
-> Looking for the JS/TS library? Check out [LangChain.js](https://github.com/langchain-ai/langchainjs).
-
-## Why use LangChain?
-
-LangChain helps developers build applications powered by LLMs through a standard interface for models, embeddings, vector stores, and more.
-
-Use LangChain for:
-
-- **Real-time data augmentation**. Easily connect LLMs to diverse data sources and external/internal systems, drawing from LangChain's vast library of integrations with model providers, tools, vector stores, retrievers, and more.
-- **Model interoperability**. Swap models in and out as your engineering team experiments to find the best choice for your application's needs. As the industry frontier evolves, adapt quickly – LangChain's abstractions keep you moving without losing momentum.
-- **Rapid prototyping**. Quickly build and iterate on LLM applications with LangChain's modular, component-based architecture. Test different approaches and workflows without rebuilding from scratch, accelerating your development cycle.
-- **Production-ready features**. Deploy reliable applications with built-in support for monitoring, evaluation, and debugging through integrations like LangSmith. Scale with confidence using battle-tested patterns and best practices.
-- **Vibrant community and ecosystem**. Leverage a rich ecosystem of integrations, templates, and community-contributed components. Benefit from continuous improvements and stay up-to-date with the latest AI developments through an active open-source community.
-- **Flexible abstraction layers**. Work at the level of abstraction that suits your needs - from high-level chains for quick starts to low-level components for fine-grained control. LangChain grows with your application's complexity.
-
-## LangChain ecosystem
-
-While the LangChain framework can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools when building LLM applications.
-
-To improve your LLM application development, pair LangChain with:
-
-- [Deep Agents](https://github.com/langchain-ai/deepagents) *(new!)* – Build agents that can plan, use subagents, and leverage file systems for complex tasks
-- [LangGraph](https://docs.langchain.com/oss/python/langgraph/overview) – Build agents that can reliably handle complex tasks with LangGraph, our low-level agent orchestration framework. LangGraph offers customizable architecture, long-term memory, and human-in-the-loop workflows – and is trusted in production by companies like LinkedIn, Uber, Klarna, and GitLab.
-- [Integrations](https://docs.langchain.com/oss/python/integrations/providers/overview) – List of LangChain integrations, including chat & embedding models, tools & toolkits, and more
-- [LangSmith](https://www.langchain.com/langsmith) – Helpful for agent evals and observability. Debug poor-performing LLM app runs, evaluate agent trajectories, gain visibility in production, and improve performance over time.
-- [LangSmith Deployment](https://docs.langchain.com/langsmith/deployments) – Deploy and scale agents effortlessly with a purpose-built deployment platform for long-running, stateful workflows. Discover, reuse, configure, and share agents across teams – and iterate quickly with visual prototyping in [LangSmith Studio](https://docs.langchain.com/langsmith/studio).
-
 ## Additional resources
 
-- [API Reference](https://reference.langchain.com/python) – Detailed reference on navigating base packages and integrations for LangChain.
 - [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview) – Learn how to contribute to LangChain projects and find good first issues.
 - [Code of Conduct](https://github.com/langchain-ai/langchain/?tab=coc-ov-file) – Our community guidelines and standards for participation.
 - [LangChain Academy](https://academy.langchain.com/) – Comprehensive, free courses on LangChain libraries and products, made by the LangChain team.

libs/core/Makefile

@@ -5,6 +5,7 @@ all: help
 
 # Define a variable for the test file path.
 TEST_FILE ?= tests/unit_tests/
+PYTEST_EXTRA ?=
 
 .EXPORT_ALL_VARIABLES:
 UV_FROZEN = true
@@ -16,7 +17,7 @@ test tests:
 	-u LANGSMITH_API_KEY \
 	-u LANGSMITH_TRACING \
 	-u LANGCHAIN_PROJECT \
-	uv run --group test pytest -n auto --disable-socket --allow-unix-socket $(TEST_FILE)
+	uv run --group test pytest -n auto $(PYTEST_EXTRA) --disable-socket --allow-unix-socket $(TEST_FILE)
 
 test_watch:
 	env \
@@ -52,19 +53,22 @@ lint_diff format_diff: PYTHON_FILES=$(shell git diff --relative=libs/core --name
 lint_package: PYTHON_FILES=langchain_core
 lint_tests: PYTHON_FILES=tests
 lint_tests: MYPY_CACHE=.mypy_cache_test
+UV_RUN_LINT = uv run --all-groups
+UV_RUN_TYPE = uv run --all-groups
+lint_package lint_tests: UV_RUN_LINT = uv run --group lint
 
 lint lint_diff lint_package lint_tests:
 	./scripts/lint_imports.sh
-	[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff check $(PYTHON_FILES)
-	[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff format $(PYTHON_FILES) --diff
-	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE) && uv run --all-groups mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	[ "$(PYTHON_FILES)" = "" ] || $(UV_RUN_LINT) ruff check $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || $(UV_RUN_LINT) ruff format $(PYTHON_FILES) --diff
+	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE) && $(UV_RUN_TYPE) mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
 type:
-	mkdir -p $(MYPY_CACHE) && uv run --all-groups mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	mkdir -p $(MYPY_CACHE) && $(UV_RUN_TYPE) mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
 format format_diff:
-	[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff format $(PYTHON_FILES)
-	[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff check --fix $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || $(UV_RUN_LINT) ruff format $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || $(UV_RUN_LINT) ruff check --fix $(PYTHON_FILES)
 
 benchmark:
 	uv run pytest tests/benchmarks --codspeed

libs/core/langchain_core/_security/__init__.py

@@ -0,0 +1,36 @@
+"""SSRF protection and security utilities.
+
+This is an **internal** module (note the `_security` prefix). It is NOT part of
+the public `langchain-core` API and may change or be removed at any time without
+notice. External code should not import from or depend on anything in this
+module. Any vulnerability reports should target the public APIs that use these
+utilities, not this internal module directly.
+"""
+
+from langchain_core._security._exceptions import SSRFBlockedError
+from langchain_core._security._policy import (
+    SSRFPolicy,
+    validate_hostname,
+    validate_resolved_ip,
+    validate_url,
+    validate_url_sync,
+)
+from langchain_core._security._transport import (
+    SSRFSafeSyncTransport,
+    SSRFSafeTransport,
+    ssrf_safe_async_client,
+    ssrf_safe_client,
+)
+
+__all__ = [
+    "SSRFBlockedError",
+    "SSRFPolicy",
+    "SSRFSafeSyncTransport",
+    "SSRFSafeTransport",
+    "ssrf_safe_async_client",
+    "ssrf_safe_client",
+    "validate_hostname",
+    "validate_resolved_ip",
+    "validate_url",
+    "validate_url_sync",
+]

libs/core/langchain_core/_security/_exceptions.py

@@ -0,0 +1,9 @@
+"""SSRF protection exceptions."""
+
+
+class SSRFBlockedError(Exception):
+    """Raised when a request is blocked by SSRF protection policy."""
+
+    def __init__(self, reason: str) -> None:
+        self.reason = reason
+        super().__init__(f"SSRF blocked: {reason}")

libs/core/langchain_core/_security/_policy.py

@@ -0,0 +1,290 @@
+"""SSRF protection policy with IP validation and DNS-aware URL checking."""
+
+import asyncio
+import dataclasses
+import ipaddress
+import os
+import socket
+import urllib.parse
+
+from langchain_core._security._exceptions import SSRFBlockedError
+
+# ---------------------------------------------------------------------------
+# Blocklist constants
+# ---------------------------------------------------------------------------
+
+_BLOCKED_IPV4_NETWORKS: tuple[ipaddress.IPv4Network, ...] = tuple(
+    ipaddress.IPv4Network(n)
+    for n in (
+        "10.0.0.0/8",  # RFC 1918 - private class A
+        "172.16.0.0/12",  # RFC 1918 - private class B
+        "192.168.0.0/16",  # RFC 1918 - private class C
+        "127.0.0.0/8",  # RFC 1122 - loopback
+        "169.254.0.0/16",  # RFC 3927 - link-local
+        "0.0.0.0/8",  # RFC 1122 - "this network"
+        "100.64.0.0/10",  # RFC 6598 - shared/CGN address space
+        "192.0.0.0/24",  # RFC 6890 - IETF protocol assignments
+        "192.0.2.0/24",  # RFC 5737 - TEST-NET-1 (documentation)
+        "198.18.0.0/15",  # RFC 2544 - benchmarking
+        "198.51.100.0/24",  # RFC 5737 - TEST-NET-2 (documentation)
+        "203.0.113.0/24",  # RFC 5737 - TEST-NET-3 (documentation)
+        "224.0.0.0/4",  # RFC 5771 - multicast
+        "240.0.0.0/4",  # RFC 1112 - reserved for future use
+        "255.255.255.255/32",  # RFC 919  - limited broadcast
+    )
+)
+
+_BLOCKED_IPV6_NETWORKS: tuple[ipaddress.IPv6Network, ...] = tuple(
+    ipaddress.IPv6Network(n)
+    for n in (
+        "::1/128",  # RFC 4291 - loopback
+        "fc00::/7",  # RFC 4193 - unique local addresses (ULA)
+        "fe80::/10",  # RFC 4291 - link-local
+        "ff00::/8",  # RFC 4291 - multicast
+        "::ffff:0:0/96",  # RFC 4291 - IPv4-mapped IPv6 addresses
+        "::0.0.0.0/96",  # RFC 4291 - IPv4-compatible IPv6 (deprecated)
+        "64:ff9b::/96",  # RFC 6052 - NAT64 well-known prefix
+        "64:ff9b:1::/48",  # RFC 8215 - NAT64 discovery prefix
+    )
+)
+
+_CLOUD_METADATA_IPS: frozenset[str] = frozenset(
+    {
+        "169.254.169.254",
+        "169.254.170.2",
+        "100.100.100.200",
+        "fd00:ec2::254",
+    }
+)
+
+_CLOUD_METADATA_HOSTNAMES: frozenset[str] = frozenset(
+    {
+        "metadata.google.internal",
+        "metadata.amazonaws.com",
+        "metadata",
+        "instance-data",
+    }
+)
+
+_LOCALHOST_NAMES: frozenset[str] = frozenset(
+    {
+        "localhost",
+        "localhost.localdomain",
+        "host.docker.internal",
+    }
+)
+
+_K8S_SUFFIX = ".svc.cluster.local"
+
+_LOOPBACK_IPV4 = ipaddress.IPv4Network("127.0.0.0/8")
+_LOOPBACK_IPV6 = ipaddress.IPv6Address("::1")
+
+# NAT64 well-known prefixes
+_NAT64_PREFIX = ipaddress.IPv6Network("64:ff9b::/96")
+_NAT64_DISCOVERY_PREFIX = ipaddress.IPv6Network("64:ff9b:1::/48")
+
+
+# ---------------------------------------------------------------------------
+# SSRFPolicy
+# ---------------------------------------------------------------------------
+
+
+@dataclasses.dataclass(frozen=True)
+class SSRFPolicy:
+    """Immutable policy controlling which URLs/IPs are considered safe."""
+
+    allowed_schemes: frozenset[str] = frozenset({"http", "https"})
+    block_private_ips: bool = True
+    block_localhost: bool = True
+    block_cloud_metadata: bool = True
+    block_k8s_internal: bool = True
+    allowed_hosts: frozenset[str] = frozenset()
+    additional_blocked_cidrs: tuple[
+        ipaddress.IPv4Network | ipaddress.IPv6Network, ...
+    ] = ()
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+
+def _extract_embedded_ipv4(
+    addr: ipaddress.IPv6Address,
+) -> ipaddress.IPv4Address | None:
+    """Extract an embedded IPv4 from IPv4-mapped or NAT64 IPv6 addresses."""
+    # Check ipv4_mapped first (covers ::ffff:x.x.x.x)
+    if addr.ipv4_mapped is not None:
+        return addr.ipv4_mapped
+
+    # Check NAT64 prefixes — embedded IPv4 is in the last 4 bytes
+    if addr in _NAT64_PREFIX or addr in _NAT64_DISCOVERY_PREFIX:
+        raw = addr.packed
+        return ipaddress.IPv4Address(raw[-4:])
+
+    return None
+
+
+def _ip_in_blocked_networks(
+    addr: ipaddress.IPv4Address | ipaddress.IPv6Address,
+    policy: SSRFPolicy,
+) -> str | None:
+    """Return a reason string if *addr* falls in a blocked range, else None."""
+    # NOTE: if profiling shows this is a hot path, consider memoising with
+    # @functools.lru_cache (key on (addr, id(policy))).
+    if isinstance(addr, ipaddress.IPv4Address):
+        if policy.block_private_ips:
+            for net in _BLOCKED_IPV4_NETWORKS:
+                if addr in net:
+                    return "private IP range"
+        for net in policy.additional_blocked_cidrs:  # type: ignore[assignment]
+            if isinstance(net, ipaddress.IPv4Network) and addr in net:
+                return "blocked CIDR"
+    else:
+        if policy.block_private_ips:
+            for net in _BLOCKED_IPV6_NETWORKS:  # type: ignore[assignment]
+                if addr in net:
+                    return "private IP range"
+        for net in policy.additional_blocked_cidrs:  # type: ignore[assignment]
+            if isinstance(net, ipaddress.IPv6Network) and addr in net:
+                return "blocked CIDR"
+
+    # Loopback check — independent of block_private_ips so that
+    # block_localhost=True still catches 127.x.x.x / ::1 even when
+    # private IPs are allowed.
+    if policy.block_localhost:
+        if isinstance(addr, ipaddress.IPv4Address) and (
+            addr in _LOOPBACK_IPV4 or addr in ipaddress.IPv4Network("0.0.0.0/8")
+        ):
+            return "localhost address"
+        if isinstance(addr, ipaddress.IPv6Address) and addr == _LOOPBACK_IPV6:
+            return "localhost address"
+
+    # Cloud metadata IP check
+    if policy.block_cloud_metadata and str(addr) in _CLOUD_METADATA_IPS:
+        return "cloud metadata endpoint"
+
+    return None
+
+
+# ---------------------------------------------------------------------------
+# Public validation functions
+# ---------------------------------------------------------------------------
+
+
+def validate_resolved_ip(ip_str: str, policy: SSRFPolicy) -> None:
+    """Validate a resolved IP address against the SSRF policy.
+
+    Raises SSRFBlockedError if the IP is blocked.
+    """
+    try:
+        addr = ipaddress.ip_address(ip_str)
+    except ValueError as exc:
+        raise SSRFBlockedError("invalid IP address") from exc
+
+    if isinstance(addr, ipaddress.IPv6Address):
+        inner = _extract_embedded_ipv4(addr)
+        if inner is not None:
+            addr = inner
+
+    reason = _ip_in_blocked_networks(addr, policy)
+    if reason is not None:
+        raise SSRFBlockedError(reason)
+
+
+def validate_hostname(hostname: str, policy: SSRFPolicy) -> None:
+    """Validate a hostname against the SSRF policy.
+
+    Raises SSRFBlockedError if the hostname is blocked.
+    """
+    lower = hostname.lower()
+
+    if policy.block_localhost and lower in _LOCALHOST_NAMES:
+        raise SSRFBlockedError("localhost address")
+
+    if policy.block_cloud_metadata and lower in _CLOUD_METADATA_HOSTNAMES:
+        raise SSRFBlockedError("cloud metadata endpoint")
+
+    if policy.block_k8s_internal and lower.endswith(_K8S_SUFFIX):
+        raise SSRFBlockedError("Kubernetes internal DNS")
+
+
+def _effective_allowed_hosts(policy: SSRFPolicy) -> frozenset[str]:
+    """Return allowed_hosts, augmented for local environments."""
+    extra: set[str] = set()
+    if os.environ.get("LANGCHAIN_ENV", "").startswith("local"):
+        extra.update({"localhost", "testserver"})
+    if extra:
+        return policy.allowed_hosts | frozenset(extra)
+    return policy.allowed_hosts
+
+
+async def validate_url(url: str, policy: SSRFPolicy = SSRFPolicy()) -> None:
+    """Validate a URL against the SSRF policy, including DNS resolution.
+
+    This is the primary entry-point for async code paths. It delegates
+    scheme/hostname/allowed-hosts checks to ``validate_url_sync``, then
+    resolves DNS and validates every resolved IP.
+
+    Raises:
+        SSRFBlockedError: If the URL violates the policy.
+    """
+    parsed = urllib.parse.urlparse(url)
+    hostname = parsed.hostname or ""
+
+    validate_url_sync(url, policy)
+
+    allowed = {h.lower() for h in _effective_allowed_hosts(policy)}
+    if hostname.lower() in allowed:
+        return
+
+    scheme = (parsed.scheme or "").lower()
+    port = parsed.port or (443 if scheme == "https" else 80)
+    try:
+        addrinfo = await asyncio.to_thread(
+            socket.getaddrinfo, hostname, port, type=socket.SOCK_STREAM
+        )
+    except socket.gaierror as exc:
+        msg = "DNS resolution failed"
+        raise SSRFBlockedError(msg) from exc
+
+    for _family, _type, _proto, _canonname, sockaddr in addrinfo:
+        validate_resolved_ip(str(sockaddr[0]), policy)
+
+
+def validate_url_sync(url: str, policy: SSRFPolicy = SSRFPolicy()) -> None:
+    """Synchronous URL validation (no DNS resolution).
+
+    Suitable for Pydantic validators and other sync contexts. Checks scheme
+    and hostname patterns only - use ``validate_url`` for full DNS-aware checking.
+
+    Raises:
+        SSRFBlockedError: If the URL violates the policy.
+    """
+    parsed = urllib.parse.urlparse(url)
+
+    scheme = (parsed.scheme or "").lower()
+    if scheme not in policy.allowed_schemes:
+        msg = f"scheme '{scheme}' not allowed"
+        raise SSRFBlockedError(msg)
+
+    hostname = parsed.hostname
+    if not hostname:
+        msg = "missing hostname"
+        raise SSRFBlockedError(msg)
+
+    allowed = _effective_allowed_hosts(policy)
+    if hostname.lower() in {h.lower() for h in allowed}:
+        return
+
+    try:
+        ipaddress.ip_address(hostname)
+        validate_resolved_ip(hostname, policy)
+    except SSRFBlockedError:
+        raise
+    except ValueError:
+        pass
+    else:
+        return
+
+    validate_hostname(hostname, policy)

libs/core/langchain_core/_security/_ssrf_protection.py

@@ -1,28 +1,8 @@
-"""SSRF Protection for validating URLs against Server-Side Request Forgery attacks.
+"""SSRF Protection - thin wrapper raising ValueError for internal callers.
 
-This module provides utilities to validate user-provided URLs and prevent SSRF attacks
-by blocking requests to:
-- Private IP ranges (RFC 1918, loopback, link-local)
-- Cloud metadata endpoints (AWS, GCP, Azure, etc.)
-- Localhost addresses
-- Invalid URL schemes
-
-Usage:
-    from lc_security.ssrf_protection import validate_safe_url, is_safe_url
-
-    # Validate a URL (raises ValueError if unsafe)
-    safe_url = validate_safe_url("https://example.com/webhook")
-
-    # Check if URL is safe (returns bool)
-    if is_safe_url("http://192.168.1.1"):
-        # URL is safe
-        pass
-
-    # Allow private IPs for development/testing (still blocks cloud metadata)
-    safe_url = validate_safe_url("http://localhost:8080", allow_private=True)
+Delegates all validation to `langchain_core._security._policy`.
 """
 
-import ipaddress
 import os
 import socket
 from typing import Annotated, Any
@@ -34,105 +14,28 @@ from pydantic import (
     HttpUrl,
 )
 
-# Private IP ranges (RFC 1918, RFC 4193, RFC 3927, loopback)
-PRIVATE_IP_RANGES = [
-    ipaddress.ip_network("10.0.0.0/8"),  # Private Class A
-    ipaddress.ip_network("172.16.0.0/12"),  # Private Class B
-    ipaddress.ip_network("192.168.0.0/16"),  # Private Class C
-    ipaddress.ip_network("127.0.0.0/8"),  # Loopback
-    ipaddress.ip_network("169.254.0.0/16"),  # Link-local (includes cloud metadata)
-    ipaddress.ip_network("0.0.0.0/8"),  # Current network
-    ipaddress.ip_network("::1/128"),  # IPv6 loopback
-    ipaddress.ip_network("fc00::/7"),  # IPv6 unique local
-    ipaddress.ip_network("fe80::/10"),  # IPv6 link-local
-    ipaddress.ip_network("ff00::/8"),  # IPv6 multicast
-]
-
-# Cloud provider metadata endpoints
-CLOUD_METADATA_IPS = [
-    "169.254.169.254",  # AWS, GCP, Azure, DigitalOcean, Oracle Cloud
-    "169.254.170.2",  # AWS ECS task metadata
-    "100.100.100.200",  # Alibaba Cloud metadata
-]
-
-CLOUD_METADATA_HOSTNAMES = [
-    "metadata.google.internal",  # GCP
-    "metadata",  # Generic
-    "instance-data",  # AWS EC2
-]
-
-# Localhost variations
-LOCALHOST_NAMES = [
-    "localhost",
-    "localhost.localdomain",
-]
+from langchain_core._security._exceptions import SSRFBlockedError
+from langchain_core._security._policy import (
+    SSRFPolicy,
+)
+from langchain_core._security._policy import (
+    validate_resolved_ip as _validate_resolved_ip,
+)
+from langchain_core._security._policy import (
+    validate_url_sync as _validate_url_sync,
+)
 
 
-def is_private_ip(ip_str: str) -> bool:
-    """Check if an IP address is in a private range.
-
-    Args:
-        ip_str: IP address as a string (e.g., "192.168.1.1")
-
-    Returns:
-        True if IP is in a private range, False otherwise
-    """
-    try:
-        ip = ipaddress.ip_address(ip_str)
-        return any(ip in range_ for range_ in PRIVATE_IP_RANGES)
-    except ValueError:
-        return False
-
-
-def is_cloud_metadata(hostname: str, ip_str: str | None = None) -> bool:
-    """Check if hostname or IP is a cloud metadata endpoint.
-
-    Args:
-        hostname: Hostname to check
-        ip_str: Optional IP address to check
-
-    Returns:
-        True if hostname or IP is a known cloud metadata endpoint
-    """
-    # Check hostname
-    if hostname.lower() in CLOUD_METADATA_HOSTNAMES:
-        return True
-
-    # Check IP
-    if ip_str and ip_str in CLOUD_METADATA_IPS:  # noqa: SIM103
-        return True
-
-    return False
-
-
-def is_localhost(hostname: str, ip_str: str | None = None) -> bool:
-    """Check if hostname or IP is localhost.
-
-    Args:
-        hostname: Hostname to check
-        ip_str: Optional IP address to check
-
-    Returns:
-        True if hostname or IP is localhost
-    """
-    # Check hostname
-    if hostname.lower() in LOCALHOST_NAMES:
-        return True
-
-    # Check IP
-    if ip_str:
-        try:
-            ip = ipaddress.ip_address(ip_str)
-            # Check if loopback
-            if ip.is_loopback:
-                return True
-            # Also check common localhost IPs
-            if ip_str in ("127.0.0.1", "::1", "0.0.0.0"):  # noqa: S104
-                return True
-        except ValueError:
-            pass
-
-    return False
+def _policy_for(*, allow_private: bool, allow_http: bool) -> SSRFPolicy:
+    """Build an `SSRFPolicy` from the legacy flag interface."""
+    schemes = frozenset({"http", "https"}) if allow_http else frozenset({"https"})
+    return SSRFPolicy(
+        allowed_schemes=schemes,
+        block_private_ips=not allow_private,
+        block_localhost=not allow_private,
+        block_cloud_metadata=True,
+        block_k8s_internal=True,
+    )
 
 
 def validate_safe_url(
@@ -147,54 +50,22 @@ def validate_safe_url(
     by blocking requests to private networks and cloud metadata endpoints.
 
     Args:
-        url: The URL to validate (string or Pydantic HttpUrl)
-        allow_private: If True, allows private IPs and localhost (for development).
+        url: The URL to validate (string or Pydantic HttpUrl).
+        allow_private: If ``True``, allows private IPs and localhost (for development).
                       Cloud metadata endpoints are ALWAYS blocked.
-        allow_http: If True, allows both HTTP and HTTPS. If False, only HTTPS.
+        allow_http: If ``True``, allows both HTTP and HTTPS.  If ``False``, only HTTPS.
 
     Returns:
-        The validated URL as a string
+        The validated URL as a string.
 
     Raises:
-        ValueError: If URL is invalid or potentially dangerous
-
-    Examples:
-        >>> validate_safe_url("https://hooks.slack.com/services/xxx")
-        'https://hooks.slack.com/services/xxx'
-
-        >>> validate_safe_url("http://127.0.0.1:8080")
-        ValueError: Localhost URLs are not allowed
-
-        >>> validate_safe_url("http://192.168.1.1")
-        ValueError: URL resolves to private IP: 192.168.1.1
-
-        >>> validate_safe_url("http://169.254.169.254/latest/meta-data/")
-        ValueError: URL resolves to cloud metadata IP: 169.254.169.254
-
-        >>> validate_safe_url("http://localhost:8080", allow_private=True)
-        'http://localhost:8080'
+        ValueError: If URL is invalid or potentially dangerous.
     """
     url_str = str(url)
     parsed = urlparse(url_str)
+    hostname = parsed.hostname or ""
 
-    # Validate URL scheme
-    if not allow_http and parsed.scheme != "https":
-        msg = "Only HTTPS URLs are allowed"
-        raise ValueError(msg)
-
-    if parsed.scheme not in ("http", "https"):
-        msg = f"Only HTTP/HTTPS URLs are allowed, got scheme: {parsed.scheme}"
-        raise ValueError(msg)
-
-    # Extract hostname
-    hostname = parsed.hostname
-    if not hostname:
-        msg = "URL must have a valid hostname"
-        raise ValueError(msg)
-
-    # Special handling for test environments - allow test server hostnames
-    # testserver is used by FastAPI/Starlette test clients and doesn't resolve via DNS
-    # Only enabled when LANGCHAIN_ENV=local_test (set in conftest.py)
+    # Test-environment bypass (preserved from original implementation)
     if (
         os.environ.get("LANGCHAIN_ENV") == "local_test"
         and hostname.startswith("test")
@@ -202,51 +73,34 @@ def validate_safe_url(
     ):
         return url_str
 
-    # ALWAYS block cloud metadata endpoints (even with allow_private=True)
-    if is_cloud_metadata(hostname):
-        msg = f"Cloud metadata endpoints are not allowed: {hostname}"
-        raise ValueError(msg)
+    policy = _policy_for(allow_private=allow_private, allow_http=allow_http)
 
-    # Check for localhost
-    if is_localhost(hostname) and not allow_private:
-        msg = f"Localhost URLs are not allowed: {hostname}"
-        raise ValueError(msg)
-
-    # Resolve hostname to IP addresses and validate each one.
-    # Note: DNS resolution results are cached by the OS, so repeated calls are fast.
+    # Synchronous scheme + hostname checks
+    try:
+        _validate_url_sync(url_str, policy)
+    except SSRFBlockedError as exc:
+        raise ValueError(str(exc)) from exc
+
+    # DNS resolution and IP validation
     try:
-        # Get all IP addresses for this hostname
         addr_info = socket.getaddrinfo(
             hostname,
             parsed.port or (443 if parsed.scheme == "https" else 80),
-            socket.AF_UNSPEC,  # Allow both IPv4 and IPv6
+            socket.AF_UNSPEC,
             socket.SOCK_STREAM,
         )
 
         for result in addr_info:
             ip_str: str = result[4][0]  # type: ignore[assignment]
-
-            # ALWAYS block cloud metadata IPs
-            if is_cloud_metadata(hostname, ip_str):
-                msg = f"URL resolves to cloud metadata IP: {ip_str}"
-                raise ValueError(msg)
-
-            # Check for localhost IPs
-            if is_localhost(hostname, ip_str) and not allow_private:
-                msg = f"URL resolves to localhost IP: {ip_str}"
-                raise ValueError(msg)
-
-            # Check for private IPs
-            if not allow_private and is_private_ip(ip_str):
-                msg = f"URL resolves to private IP address: {ip_str}"
-                raise ValueError(msg)
+            try:
+                _validate_resolved_ip(ip_str, policy)
+            except SSRFBlockedError as exc:
+                raise ValueError(str(exc)) from exc
 
     except socket.gaierror as e:
-        # DNS resolution failed - fail closed for security
         msg = f"Failed to resolve hostname '{hostname}': {e}"
         raise ValueError(msg) from e
     except OSError as e:
-        # Other network errors - fail closed
         msg = f"Network error while validating URL: {e}"
         raise ValueError(msg) from e
 
@@ -259,26 +113,7 @@ def is_safe_url(
     allow_private: bool = False,
     allow_http: bool = True,
 ) -> bool:
-    """Check if a URL is safe (non-throwing version of validate_safe_url).
-
-    Args:
-        url: The URL to check
-        allow_private: If True, allows private IPs and localhost
-        allow_http: If True, allows both HTTP and HTTPS
-
-    Returns:
-        True if URL is safe, False otherwise
-
-    Examples:
-        >>> is_safe_url("https://example.com")
-        True
-
-        >>> is_safe_url("http://127.0.0.1:8080")
-        False
-
-        >>> is_safe_url("http://localhost:8080", allow_private=True)
-        True
-    """
+    """Non-throwing version of `validate_safe_url`."""
     try:
         validate_safe_url(url, allow_private=allow_private, allow_http=allow_http)
     except ValueError:
@@ -295,7 +130,6 @@ def _validate_url_ssrf_strict(v: Any) -> Any:
 
 
 def _validate_url_ssrf_https_only(v: Any) -> Any:
-    """Validate URL for SSRF protection (HTTPS only, strict mode)."""
     if isinstance(v, str):
         validate_safe_url(v, allow_private=False, allow_http=False)
     return v
@@ -310,52 +144,12 @@ def _validate_url_ssrf_relaxed(v: Any) -> Any:
 
 # Annotated types with SSRF protection
 SSRFProtectedUrl = Annotated[HttpUrl, BeforeValidator(_validate_url_ssrf_strict)]
-"""A Pydantic HttpUrl type with built-in SSRF protection.
-
-This blocks private IPs, localhost, and cloud metadata endpoints.
-
-Example:
-    class WebhookSchema(BaseModel):
-        url: SSRFProtectedUrl  # Automatically validated for SSRF
-        headers: dict[str, str] | None = None
-"""
-
 SSRFProtectedUrlRelaxed = Annotated[
     HttpUrl, BeforeValidator(_validate_url_ssrf_relaxed)
 ]
-"""A Pydantic HttpUrl with relaxed SSRF protection (allows private IPs).
-
-Use this for development/testing webhooks where localhost/private IPs are needed.
-Cloud metadata endpoints are still blocked.
-
-Example:
-    class DevWebhookSchema(BaseModel):
-        url: SSRFProtectedUrlRelaxed  # Allows localhost, blocks cloud metadata
-"""
-
 SSRFProtectedHttpsUrl = Annotated[
     HttpUrl, BeforeValidator(_validate_url_ssrf_https_only)
 ]
-"""A Pydantic HttpUrl with SSRF protection that only allows HTTPS.
-
-This blocks private IPs, localhost, cloud metadata endpoints, and HTTP URLs.
-
-Example:
-    class SecureWebhookSchema(BaseModel):
-        url: SSRFProtectedHttpsUrl  # Only HTTPS, blocks private IPs
-"""
-
 SSRFProtectedHttpsUrlStr = Annotated[
     str, BeforeValidator(_validate_url_ssrf_https_only)
 ]
-"""A string type with SSRF protection that only allows HTTPS URLs.
-
-Same as SSRFProtectedHttpsUrl but returns a string instead of HttpUrl.
-Useful for FastAPI query parameters where you need a string URL.
-
-Example:
-    @router.get("/proxy")
-    async def proxy_get(url: SSRFProtectedHttpsUrlStr):
-        async with httpx.AsyncClient() as client:
-            resp = await client.get(url)
-"""

libs/core/langchain_core/_security/_transport.py

@@ -0,0 +1,252 @@
+"""SSRF-safe httpx transport with DNS resolution and IP pinning."""
+
+import asyncio
+import socket
+
+import httpx
+
+from langchain_core._security._exceptions import SSRFBlockedError
+from langchain_core._security._policy import (
+    SSRFPolicy,
+    _effective_allowed_hosts,
+    validate_resolved_ip,
+    validate_url_sync,
+)
+
+# Keys that AsyncHTTPTransport accepts (forwarded from factory kwargs).
+_TRANSPORT_KWARGS = frozenset(
+    {
+        "verify",
+        "cert",
+        "trust_env",
+        "http1",
+        "http2",
+        "limits",
+        "retries",
+    }
+)
+
+
+class SSRFSafeTransport(httpx.AsyncBaseTransport):
+    """httpx async transport that validates DNS results against an SSRF policy.
+
+    For every outgoing request the transport:
+    1. Checks the URL scheme against ``policy.allowed_schemes``.
+    2. Validates the hostname against blocked patterns.
+    3. Resolves DNS and validates **all** returned IPs.
+    4. Rewrites the request to connect to the first valid IP while
+       preserving the original ``Host`` header and TLS SNI hostname.
+
+    Redirects are re-validated on each hop because ``follow_redirects``
+    is set on the *client*, causing ``handle_async_request`` to be called
+    again for each redirect target.
+    """
+
+    def __init__(
+        self,
+        policy: SSRFPolicy = SSRFPolicy(),
+        **transport_kwargs: object,
+    ) -> None:
+        self._policy = policy
+        self._inner = httpx.AsyncHTTPTransport(**transport_kwargs)  # type: ignore[arg-type]
+
+    # ------------------------------------------------------------------ #
+    # Core request handler
+    # ------------------------------------------------------------------ #
+
+    async def handle_async_request(
+        self,
+        request: httpx.Request,
+    ) -> httpx.Response:
+        hostname = request.url.host or ""
+        scheme = request.url.scheme.lower()
+
+        # 1-3. Scheme, hostname, and pattern checks (reuse sync validator).
+        try:
+            validate_url_sync(str(request.url), self._policy)
+        except SSRFBlockedError:
+            raise
+
+        # Allowed-hosts bypass - skip DNS/IP validation entirely.
+        allowed = {h.lower() for h in _effective_allowed_hosts(self._policy)}
+        if hostname.lower() in allowed:
+            return await self._inner.handle_async_request(request)
+
+        # 4. DNS resolution
+        port = request.url.port or (443 if scheme == "https" else 80)
+        try:
+            addrinfo = await asyncio.to_thread(
+                socket.getaddrinfo,
+                hostname,
+                port,
+                type=socket.SOCK_STREAM,
+            )
+        except socket.gaierror as exc:
+            raise SSRFBlockedError("DNS resolution failed") from exc
+
+        if not addrinfo:
+            raise SSRFBlockedError("DNS resolution returned no results")
+
+        # 5. Validate ALL resolved IPs - any blocked means reject.
+        for _family, _type, _proto, _canonname, sockaddr in addrinfo:
+            ip_str: str = sockaddr[0]  # type: ignore[assignment]
+            validate_resolved_ip(ip_str, self._policy)
+
+        # 6. Pin to first resolved IP.
+        pinned_ip = addrinfo[0][4][0]
+
+        # 7. Rewrite URL to use pinned IP, preserving Host header and SNI.
+        pinned_url = request.url.copy_with(host=pinned_ip)
+
+        # Build extensions dict, adding sni_hostname for HTTPS so TLS
+        # certificate validation uses the original hostname.
+        extensions = dict(request.extensions)
+        if scheme == "https":
+            extensions["sni_hostname"] = hostname.encode("ascii")
+
+        pinned_request = httpx.Request(
+            method=request.method,
+            url=pinned_url,
+            headers=request.headers,  # Host header already set to original
+            content=request.content,
+            extensions=extensions,
+        )
+
+        return await self._inner.handle_async_request(pinned_request)
+
+    # ------------------------------------------------------------------ #
+    # Lifecycle
+    # ------------------------------------------------------------------ #
+
+    async def aclose(self) -> None:
+        await self._inner.aclose()
+
+
+# ---------------------------------------------------------------------- #
+# Factory
+# ---------------------------------------------------------------------- #
+
+
+class SSRFSafeSyncTransport(httpx.BaseTransport):
+    """httpx sync transport that validates DNS results against an SSRF policy.
+
+    Sync mirror of `SSRFSafeTransport`. See that class for full documentation.
+    """
+
+    def __init__(
+        self,
+        policy: SSRFPolicy = SSRFPolicy(),
+        **transport_kwargs: object,
+    ) -> None:
+        self._policy = policy
+        self._inner = httpx.HTTPTransport(**transport_kwargs)  # type: ignore[arg-type]
+
+    def handle_request(
+        self,
+        request: httpx.Request,
+    ) -> httpx.Response:
+        hostname = request.url.host or ""
+        scheme = request.url.scheme.lower()
+
+        validate_url_sync(str(request.url), self._policy)
+
+        allowed = {h.lower() for h in _effective_allowed_hosts(self._policy)}
+        if hostname.lower() in allowed:
+            return self._inner.handle_request(request)
+
+        port = request.url.port or (443 if scheme == "https" else 80)
+        try:
+            addrinfo = socket.getaddrinfo(
+                hostname,
+                port,
+                type=socket.SOCK_STREAM,
+            )
+        except socket.gaierror as exc:
+            raise SSRFBlockedError("DNS resolution failed") from exc
+
+        if not addrinfo:
+            raise SSRFBlockedError("DNS resolution returned no results")
+
+        for _family, _type, _proto, _canonname, sockaddr in addrinfo:
+            ip_str: str = sockaddr[0]  # type: ignore[assignment]
+            validate_resolved_ip(ip_str, self._policy)
+
+        pinned_ip = addrinfo[0][4][0]
+        pinned_url = request.url.copy_with(host=pinned_ip)
+
+        extensions = dict(request.extensions)
+        if scheme == "https":
+            extensions["sni_hostname"] = hostname.encode("ascii")
+
+        pinned_request = httpx.Request(
+            method=request.method,
+            url=pinned_url,
+            headers=request.headers,
+            content=request.content,
+            extensions=extensions,
+        )
+
+        return self._inner.handle_request(pinned_request)
+
+    def close(self) -> None:
+        self._inner.close()
+
+
+# ---------------------------------------------------------------------- #
+# Factories
+# ---------------------------------------------------------------------- #
+
+
+def ssrf_safe_client(
+    policy: SSRFPolicy = SSRFPolicy(),
+    **kwargs: object,
+) -> httpx.Client:
+    """Create an `httpx.Client` with SSRF protection."""
+    transport_kwargs: dict[str, object] = {}
+    client_kwargs: dict[str, object] = {}
+    for key, value in kwargs.items():
+        if key in _TRANSPORT_KWARGS:
+            transport_kwargs[key] = value
+        else:
+            client_kwargs[key] = value
+
+    transport = SSRFSafeSyncTransport(policy=policy, **transport_kwargs)
+
+    client_kwargs.setdefault("follow_redirects", True)
+    client_kwargs.setdefault("max_redirects", 10)
+
+    return httpx.Client(
+        transport=transport,
+        **client_kwargs,  # type: ignore[arg-type]
+    )
+
+
+def ssrf_safe_async_client(
+    policy: SSRFPolicy = SSRFPolicy(),
+    **kwargs: object,
+) -> httpx.AsyncClient:
+    """Create an ``httpx.AsyncClient`` with SSRF protection.
+
+    Drop-in replacement for ``httpx.AsyncClient(...)`` - callers just swap
+    the constructor call.  Transport-specific kwargs (``verify``, ``cert``,
+    ``retries``, etc.) are forwarded to the inner ``AsyncHTTPTransport``;
+    everything else goes to the ``AsyncClient``.
+    """
+    transport_kwargs: dict[str, object] = {}
+    client_kwargs: dict[str, object] = {}
+    for key, value in kwargs.items():
+        if key in _TRANSPORT_KWARGS:
+            transport_kwargs[key] = value
+        else:
+            client_kwargs[key] = value
+
+    transport = SSRFSafeTransport(policy=policy, **transport_kwargs)
+
+    # Apply defaults only if not overridden by caller.
+    client_kwargs.setdefault("follow_redirects", True)
+    client_kwargs.setdefault("max_redirects", 10)
+
+    return httpx.AsyncClient(
+        transport=transport,
+        **client_kwargs,  # type: ignore[arg-type]
+    )

libs/core/langchain_core/caches.py

@@ -166,14 +166,14 @@ class InMemoryCache(BaseCache):
         # Update cache
         cache.update(
             prompt="What is the capital of France?",
-            llm_string="model='gpt-3.5-turbo', temperature=0.1",
+            llm_string="model='gpt-5.4-mini',
             return_val=[Generation(text="Paris")],
         )
 
         # Lookup cache
         result = cache.lookup(
             prompt="What is the capital of France?",
-            llm_string="model='gpt-3.5-turbo', temperature=0.1",
+            llm_string="model='gpt-5.4-mini',
         )
         # result is [Generation(text="Paris")]
         ```

libs/core/langchain_core/language_models/base.py

@@ -69,6 +69,8 @@ class LangSmithParams(TypedDict, total=False):
 
     ls_stop: list[str] | None
     """Stop words for generation."""
+    ls_integration: str
+    """Integration that created the trace."""
 
 
 @cache  # Cache the tokenizer
@@ -299,6 +301,22 @@ class BaseLanguageModel(
         # generate responses that match a given schema.
         raise NotImplementedError
 
+    def _get_ls_params(
+        self,
+        stop: list[str] | None = None,  # noqa: ARG002
+        **kwargs: Any,  # noqa: ARG002
+    ) -> LangSmithParams:
+        """Get standard params for tracing."""
+        return LangSmithParams()
+
+    def _get_ls_params_with_defaults(
+        self,
+        stop: list[str] | None = None,
+        **kwargs: Any,
+    ) -> LangSmithParams:
+        """Wrap _get_ls_params to include any additional default parameters."""
+        return self._get_ls_params(stop=stop, **kwargs)
+
     @property
     def _identifying_params(self) -> Mapping[str, Any]:
         """Get the identifying parameters."""

libs/core/langchain_core/language_models/chat_models.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import asyncio
+import contextlib
 import inspect
 import json
 from abc import ABC, abstractmethod
@@ -11,8 +12,8 @@ from functools import cached_property
 from operator import itemgetter
 from typing import TYPE_CHECKING, Any, Literal, cast
 
-from pydantic import BaseModel, ConfigDict, Field
-from typing_extensions import override
+from pydantic import BaseModel, ConfigDict, Field, model_validator
+from typing_extensions import Self, override
 
 from langchain_core.caches import BaseCache
 from langchain_core.callbacks import (
@@ -32,7 +33,10 @@ from langchain_core.language_models.base import (
     LangSmithParams,
     LanguageModelInput,
 )
-from langchain_core.language_models.model_profile import ModelProfile
+from langchain_core.language_models.model_profile import (
+    ModelProfile,
+    _warn_unknown_profile_keys,
+)
 from langchain_core.load import dumpd, dumps
 from langchain_core.messages import (
     AIMessage,
@@ -357,6 +361,54 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
         arbitrary_types_allowed=True,
     )
 
+    def _resolve_model_profile(self) -> ModelProfile | None:
+        """Return the default model profile, or `None` if unavailable.
+
+        Override this in subclasses instead of `_set_model_profile`. The base
+        validator calls it automatically and handles assignment. This avoids
+        coupling partner code to Pydantic validator mechanics.
+
+        Each partner needs its own override because things can vary per-partner,
+        such as the attribute that identifies the model (e.g., `model`,
+        `model_name`, `model_id`, `deployment_name`) and the partner-local
+        `_get_default_model_profile` function that reads from each partner's own
+        profile data.
+        """
+        # TODO: consider adding a `_model_identifier` property on BaseChatModel
+        # to standardize how partners identify their model, which could allow a
+        # default implementation here that calls a shared
+        # profile-loading mechanism.
+        return None
+
+    @model_validator(mode="after")
+    def _set_model_profile(self) -> Self:
+        """Populate `profile` from `_resolve_model_profile` if not provided.
+
+        Partners should override `_resolve_model_profile` rather than this
+        validator. Overriding this with a new `@model_validator` replaces the
+        base validator (Pydantic v2 behavior), bypassing the standard resolution
+        path. A plain method override does not prevent the base validator from
+        running.
+        """
+        if self.profile is None:
+            # Suppress errors from partner overrides (e.g., missing profile
+            # files, broken imports) so model construction never fails over an
+            # optional field.
+            with contextlib.suppress(Exception):
+                self.profile = self._resolve_model_profile()
+        return self
+
+    # NOTE: _check_profile_keys must be defined AFTER _set_model_profile.
+    # Pydantic v2 runs mode="after" validators in definition order.
+    @model_validator(mode="after")
+    def _check_profile_keys(self) -> Self:
+        """Warn on unrecognized profile keys."""
+        # isinstance guard: ModelProfile is a TypedDict (always a dict), but
+        # protects against unexpected types from partner overrides.
+        if self.profile and isinstance(self.profile, dict):
+            _warn_unknown_profile_keys(self.profile)
+        return self
+
     @cached_property
     def _serialized(self) -> dict[str, Any]:
         # self is always a Serializable object in this case, thus the result is
@@ -505,7 +557,7 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
             options = {"stop": stop, **kwargs, **ls_structured_output_format_dict}
             inheritable_metadata = {
                 **(config.get("metadata") or {}),
-                **self._get_ls_params(stop=stop, **kwargs),
+                **self._get_ls_params_with_defaults(stop=stop, **kwargs),
             }
             callback_manager = CallbackManager.configure(
                 config.get("callbacks"),
@@ -633,7 +685,7 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
         options = {"stop": stop, **kwargs, **ls_structured_output_format_dict}
         inheritable_metadata = {
             **(config.get("metadata") or {}),
-            **self._get_ls_params(stop=stop, **kwargs),
+            **self._get_ls_params_with_defaults(stop=stop, **kwargs),
         }
         callback_manager = AsyncCallbackManager.configure(
             config.get("callbacks"),
@@ -827,6 +879,16 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
 
         return ls_params
 
+    def _get_ls_params_with_defaults(
+        self,
+        stop: list[str] | None = None,
+        **kwargs: Any,
+    ) -> LangSmithParams:
+        """Wrap _get_ls_params to always include ls_integration."""
+        ls_params = self._get_ls_params(stop=stop, **kwargs)
+        ls_params["ls_integration"] = "langchain_chat_model"
+        return ls_params
+
     def _get_llm_string(self, stop: list[str] | None = None, **kwargs: Any) -> str:
         if self.is_lc_serializable():
             params = {**kwargs, "stop": stop}
@@ -899,7 +961,7 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
         options = {"stop": stop, **ls_structured_output_format_dict}
         inheritable_metadata = {
             **(metadata or {}),
-            **self._get_ls_params(stop=stop, **kwargs),
+            **self._get_ls_params_with_defaults(stop=stop, **kwargs),
         }
 
         callback_manager = CallbackManager.configure(
@@ -1022,7 +1084,7 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
         options = {"stop": stop, **ls_structured_output_format_dict}
         inheritable_metadata = {
             **(metadata or {}),
-            **self._get_ls_params(stop=stop, **kwargs),
+            **self._get_ls_params_with_defaults(stop=stop, **kwargs),
         }
 
         callback_manager = AsyncCallbackManager.configure(

libs/core/langchain_core/language_models/llms.py

@@ -527,7 +527,7 @@ class BaseLLM(BaseLanguageModel[str], ABC):
             options = {"stop": stop}
             inheritable_metadata = {
                 **(config.get("metadata") or {}),
-                **self._get_ls_params(stop=stop, **kwargs),
+                **self._get_ls_params_with_defaults(stop=stop, **kwargs),
             }
             callback_manager = CallbackManager.configure(
                 config.get("callbacks"),
@@ -597,7 +597,7 @@ class BaseLLM(BaseLanguageModel[str], ABC):
         options = {"stop": stop}
         inheritable_metadata = {
             **(config.get("metadata") or {}),
-            **self._get_ls_params(stop=stop, **kwargs),
+            **self._get_ls_params_with_defaults(stop=stop, **kwargs),
         }
         callback_manager = AsyncCallbackManager.configure(
             config.get("callbacks"),
@@ -906,14 +906,14 @@ class BaseLLM(BaseLanguageModel[str], ABC):
             metadata = [
                 {
                     **(meta or {}),
-                    **self._get_ls_params(stop=stop, **kwargs),
+                    **self._get_ls_params_with_defaults(stop=stop, **kwargs),
                 }
                 for meta in metadata
             ]
         elif isinstance(metadata, dict):
             metadata = {
                 **(metadata or {}),
-                **self._get_ls_params(stop=stop, **kwargs),
+                **self._get_ls_params_with_defaults(stop=stop, **kwargs),
             }
         if (
             isinstance(callbacks, list)
@@ -1173,14 +1173,14 @@ class BaseLLM(BaseLanguageModel[str], ABC):
             metadata = [
                 {
                     **(meta or {}),
-                    **self._get_ls_params(stop=stop, **kwargs),
+                    **self._get_ls_params_with_defaults(stop=stop, **kwargs),
                 }
                 for meta in metadata
             ]
         elif isinstance(metadata, dict):
             metadata = {
                 **(metadata or {}),
-                **self._get_ls_params(stop=stop, **kwargs),
+                **self._get_ls_params_with_defaults(stop=stop, **kwargs),
             }
         # Create callback managers
         if isinstance(callbacks, list) and (

libs/core/langchain_core/language_models/model_profile.py

@@ -1,7 +1,14 @@
 """Model profile types and utilities."""
 
+import logging
+import warnings
+from typing import get_type_hints
+
+from pydantic import ConfigDict
 from typing_extensions import TypedDict
 
+logger = logging.getLogger(__name__)
+
 
 class ModelProfile(TypedDict, total=False):
     """Model profile.
@@ -14,6 +21,25 @@ class ModelProfile(TypedDict, total=False):
     and supported features.
     """
 
+    __pydantic_config__ = ConfigDict(extra="allow")  # type: ignore[misc]
+
+    # --- Model metadata ---
+
+    name: str
+    """Human-readable model name."""
+
+    status: str
+    """Model status (e.g., `'active'`, `'deprecated'`)."""
+
+    release_date: str
+    """Model release date (ISO 8601 format, e.g., `'2025-06-01'`)."""
+
+    last_updated: str
+    """Date the model was last updated (ISO 8601 format)."""
+
+    open_weights: bool
+    """Whether the model weights are openly available."""
+
     # --- Input constraints ---
 
     max_input_tokens: int
@@ -86,6 +112,45 @@ class ModelProfile(TypedDict, total=False):
     """Whether the model supports a native [structured output](https://docs.langchain.com/oss/python/langchain/models#structured-outputs)
     feature"""
 
+    # --- Other capabilities ---
+
+    attachment: bool
+    """Whether the model supports file attachments."""
+
+    temperature: bool
+    """Whether the model supports a temperature parameter."""
+
 
 ModelProfileRegistry = dict[str, ModelProfile]
 """Registry mapping model identifiers or names to their ModelProfile."""
+
+
+def _warn_unknown_profile_keys(profile: ModelProfile) -> None:
+    """Warn if `profile` contains keys not declared on `ModelProfile`.
+
+    Args:
+        profile: The model profile dict to check for undeclared keys.
+    """
+    if not isinstance(profile, dict):
+        return
+
+    try:
+        declared = frozenset(get_type_hints(ModelProfile).keys())
+    except (TypeError, NameError):
+        # get_type_hints raises NameError on unresolvable forward refs and
+        # TypeError when annotations evaluate to non-type objects.
+        logger.debug(
+            "Could not resolve type hints for ModelProfile; "
+            "skipping unknown-key check.",
+            exc_info=True,
+        )
+        return
+
+    extra = sorted(set(profile) - declared)
+    if extra:
+        warnings.warn(
+            f"Unrecognized keys in model profile: {extra}. "
+            f"This may indicate a version mismatch between langchain-core "
+            f"and your provider package. Consider upgrading langchain-core.",
+            stacklevel=2,
+        )

libs/core/langchain_core/load/load.py

@@ -109,6 +109,7 @@ from langchain_core.load.mapping import (
     SERIALIZABLE_MAPPING,
 )
 from langchain_core.load.serializable import Serializable
+from langchain_core.load.validators import CLASS_INIT_VALIDATORS
 
 DEFAULT_NAMESPACES = [
     "langchain",
@@ -480,6 +481,19 @@ class Reviver:
                 msg = f"Invalid namespace: {value}"
                 raise ValueError(msg)
 
+            # We don't need to recurse on kwargs
+            # as json.loads will do that for us.
+            kwargs = value.get("kwargs", {})
+
+            # Run class-specific validators before the general init_validator.
+            # These run before importing to fail fast on security violations.
+            if mapping_key in CLASS_INIT_VALIDATORS:
+                CLASS_INIT_VALIDATORS[mapping_key](mapping_key, kwargs)
+
+            # Also run general init_validator (e.g., jinja2 blocking)
+            if self.init_validator is not None:
+                self.init_validator(mapping_key, kwargs)
+
             mod = importlib.import_module(".".join(import_dir))
 
             cls = getattr(mod, name)
@@ -489,13 +503,6 @@ class Reviver:
                 msg = f"Invalid namespace: {value}"
                 raise ValueError(msg)
 
-            # We don't need to recurse on kwargs
-            # as json.loads will do that for us.
-            kwargs = value.get("kwargs", {})
-
-            if self.init_validator is not None:
-                self.init_validator(mapping_key, kwargs)
-
             return cls(**kwargs)
 
         return value

libs/core/langchain_core/load/mapping.py

@@ -283,6 +283,11 @@ SERIALIZABLE_MAPPING: dict[tuple[str, ...], tuple[str, ...]] = {
         "chat_models",
         "ChatXAI",
     ),
+    ("langchain_baseten", "chat_models", "ChatBaseten"): (
+        "langchain_baseten",
+        "chat_models",
+        "ChatBaseten",
+    ),
     ("langchain", "chat_models", "fireworks", "ChatFireworks"): (
         "langchain_fireworks",
         "chat_models",
@@ -316,6 +321,12 @@ SERIALIZABLE_MAPPING: dict[tuple[str, ...], tuple[str, ...]] = {
         "bedrock",
         "ChatBedrock",
     ),
+    ("langchain_aws", "chat_models", "ChatBedrockConverse"): (
+        "langchain_aws",
+        "chat_models",
+        "bedrock_converse",
+        "ChatBedrockConverse",
+    ),
     ("langchain_google_genai", "chat_models", "ChatGoogleGenerativeAI"): (
         "langchain_google_genai",
         "chat_models",
@@ -375,6 +386,12 @@ SERIALIZABLE_MAPPING: dict[tuple[str, ...], tuple[str, ...]] = {
         "bedrock",
         "BedrockLLM",
     ),
+    ("langchain", "llms", "bedrock", "BedrockLLM"): (
+        "langchain_aws",
+        "llms",
+        "bedrock",
+        "BedrockLLM",
+    ),
     ("langchain", "llms", "fireworks", "Fireworks"): (
         "langchain_fireworks",
         "llms",

libs/core/langchain_core/load/validators.py

@@ -0,0 +1,77 @@
+"""Init validators for deserialization security.
+
+This module contains extra validators that are called during deserialization,
+ex. to prevent security issues such as SSRF attacks.
+
+Each validator is a callable matching the `InitValidator` protocol: it takes a
+class path tuple and kwargs dict, returns `None` on success, and raises
+`ValueError` if the deserialization should be blocked.
+"""
+
+from typing import TYPE_CHECKING, Any
+
+if TYPE_CHECKING:
+    from langchain_core.load.load import InitValidator
+
+
+def _bedrock_validator(class_path: tuple[str, ...], kwargs: dict[str, Any]) -> None:
+    """Constructor kwargs validator for AWS Bedrock integrations.
+
+    Blocks deserialization if `endpoint_url` or `base_url` parameters are
+    present, which could enable SSRF attacks.
+
+    Args:
+        class_path: The class path tuple being deserialized.
+        kwargs: The kwargs dict for the class constructor.
+
+    Raises:
+        ValueError: If `endpoint_url` or `base_url` parameters are present.
+    """
+    dangerous_params = ["endpoint_url", "base_url"]
+    found_params = [p for p in dangerous_params if p in kwargs]
+
+    if found_params:
+        class_name = class_path[-1] if class_path else "Unknown"
+        param_str = ", ".join(found_params)
+        msg = (
+            f"Deserialization of {class_name} with {param_str} is not allowed "
+            f"for security reasons. These parameters can enable Server-Side Request "
+            f"Forgery (SSRF) attacks by directing network requests to arbitrary "
+            f"endpoints during initialization. If you need to use a custom endpoint, "
+            f"instantiate {class_name} directly rather than deserializing it."
+        )
+        raise ValueError(msg)
+
+
+# Keys must cover both serialized IDs (SERIALIZABLE_MAPPING keys) and resolved
+# import paths (SERIALIZABLE_MAPPING values) to prevent bypass via direct paths.
+CLASS_INIT_VALIDATORS: dict[tuple[str, ...], "InitValidator"] = {
+    # Serialized (legacy) keys
+    ("langchain", "chat_models", "bedrock", "BedrockChat"): _bedrock_validator,
+    ("langchain", "chat_models", "bedrock", "ChatBedrock"): _bedrock_validator,
+    (
+        "langchain",
+        "chat_models",
+        "anthropic_bedrock",
+        "ChatAnthropicBedrock",
+    ): _bedrock_validator,
+    ("langchain_aws", "chat_models", "ChatBedrockConverse"): _bedrock_validator,
+    ("langchain", "llms", "bedrock", "Bedrock"): _bedrock_validator,
+    ("langchain", "llms", "bedrock", "BedrockLLM"): _bedrock_validator,
+    # Resolved import paths (from ALL_SERIALIZABLE_MAPPINGS values) to defend
+    # against payloads that use the target tuple directly as the "id".
+    (
+        "langchain_aws",
+        "chat_models",
+        "bedrock_converse",
+        "ChatBedrockConverse",
+    ): _bedrock_validator,
+    (
+        "langchain_aws",
+        "chat_models",
+        "anthropic",
+        "ChatAnthropicBedrock",
+    ): _bedrock_validator,
+    ("langchain_aws", "chat_models", "ChatBedrock"): _bedrock_validator,
+    ("langchain_aws", "llms", "bedrock", "BedrockLLM"): _bedrock_validator,
+}

libs/core/langchain_core/messages/block_translators/openai.py

@@ -103,11 +103,13 @@ def convert_to_openai_data_block(
                 # Backward compat
                 file["filename"] = extras["filename"]
             else:
-                # Can't infer filename
+                # Can't infer filename; set a placeholder default for compatibility.
+                file["filename"] = "LC_AUTOGENERATED"
                 warnings.warn(
                     "OpenAI may require a filename for file uploads. Specify a filename"
                     " in the content block, e.g.: {'type': 'file', 'mime_type': "
-                    "'...', 'base64': '...', 'filename': 'my-file.pdf'}",
+                    "'...', 'base64': '...', 'filename': 'my-file.pdf'}. "
+                    "Using placeholder filename 'LC_AUTOGENERATED'.",
                     stacklevel=1,
                 )
             formatted_block = {"type": "file", "file": file}
@@ -333,10 +335,9 @@ def _convert_from_v03_ai_message(message: AIMessage) -> AIMessage:
 
     # Reasoning
     if reasoning := message.additional_kwargs.get("reasoning"):
-        if isinstance(message, AIMessageChunk) and message.chunk_position != "last":
-            buckets["reasoning"].append({**reasoning, "type": "reasoning"})
-        else:
-            buckets["reasoning"].append(reasoning)
+        if "type" not in reasoning:
+            reasoning = {**reasoning, "type": "reasoning"}
+        buckets["reasoning"].append(reasoning)
 
     # Refusal
     if refusal := message.additional_kwargs.get("refusal"):

libs/core/langchain_core/messages/utils.py

@@ -874,9 +874,9 @@ def filter_messages(
 
         filter_messages(
             messages,
-            incl_names=("example_user", "example_assistant"),
-            incl_types=("system",),
-            excl_ids=("bar",),
+            include_names=("example_user", "example_assistant"),
+            include_types=("system",),
+            exclude_ids=("bar",),
         )
         ```
 
@@ -1551,7 +1551,7 @@ def convert_to_openai_messages(
             {
                 "role": "user",
                 "content": [
-                    {"type": "text", "text": "whats in this"},
+                    {"type": "text", "text": "what's in this"},
                     {
                         "type": "image_url",
                         "image_url": {"url": "data:image/png;base64,'/9j/4AAQSk'"},
@@ -1570,15 +1570,15 @@ def convert_to_openai_messages(
                 ],
             ),
             ToolMessage("foobar", tool_call_id="1", name="bar"),
-            {"role": "assistant", "content": "thats nice"},
+            {"role": "assistant", "content": "that's nice"},
         ]
         oai_messages = convert_to_openai_messages(messages)
         # -> [
         #   {'role': 'system', 'content': 'foo'},
-        #   {'role': 'user', 'content': [{'type': 'text', 'text': 'whats in this'}, {'type': 'image_url', 'image_url': {'url': "data:image/png;base64,'/9j/4AAQSk'"}}]},
+        #   {'role': 'user', 'content': [{'type': 'text', 'text': 'what's in this'}, {'type': 'image_url', 'image_url': {'url': "data:image/png;base64,'/9j/4AAQSk'"}}]},
         #   {'role': 'assistant', 'tool_calls': [{'type': 'function', 'id': '1','function': {'name': 'analyze', 'arguments': '{"baz": "buz"}'}}], 'content': ''},
         #   {'role': 'tool', 'name': 'bar', 'content': 'foobar'},
-        #   {'role': 'assistant', 'content': 'thats nice'}
+        #   {'role': 'assistant', 'content': 'that's nice'}
         # ]
         ```
 

libs/core/langchain_core/prompts/base.py

@@ -15,6 +15,7 @@ import yaml
 from pydantic import BaseModel, ConfigDict, Field, model_validator
 from typing_extensions import Self, override
 
+from langchain_core._api import deprecated
 from langchain_core.exceptions import ErrorCode, create_message
 from langchain_core.load import dumpd
 from langchain_core.output_parsers.base import BaseOutputParser  # noqa: TC001
@@ -350,6 +351,12 @@ class BasePromptTemplate(
             prompt_dict["_type"] = self._prompt_type
         return prompt_dict
 
+    @deprecated(
+        since="1.2.21",
+        removal="2.0.0",
+        alternative="Use `dumpd`/`dumps` from `langchain_core.load` to serialize "
+        "prompts and `load`/`loads` to deserialize them.",
+    )
     def save(self, file_path: Path | str) -> None:
         """Save the prompt.
 
@@ -382,11 +389,12 @@ class BasePromptTemplate(
         directory_path = save_path.parent
         directory_path.mkdir(parents=True, exist_ok=True)
 
-        if save_path.suffix == ".json":
-            with save_path.open("w", encoding="utf-8") as f:
+        resolved_path = save_path.resolve()
+        if resolved_path.suffix == ".json":
+            with resolved_path.open("w", encoding="utf-8") as f:
                 json.dump(prompt_dict, f, indent=4)
-        elif save_path.suffix.endswith((".yaml", ".yml")):
-            with save_path.open("w", encoding="utf-8") as f:
+        elif resolved_path.suffix.endswith((".yaml", ".yml")):
+            with resolved_path.open("w", encoding="utf-8") as f:
                 yaml.dump(prompt_dict, f, default_flow_style=False)
         else:
             msg = f"{save_path} must be json or yaml"

libs/core/langchain_core/prompts/chat.py

@@ -22,6 +22,7 @@ from pydantic import (
 )
 from typing_extensions import Self, override
 
+from langchain_core._api import deprecated
 from langchain_core.messages import (
     AIMessage,
     AnyMessage,
@@ -1305,6 +1306,12 @@ class ChatPromptTemplate(BaseChatPromptTemplate):
         """Name of prompt type. Used for serialization."""
         return "chat"
 
+    @deprecated(
+        since="1.2.21",
+        removal="2.0.0",
+        alternative="Use `dumpd`/`dumps` from `langchain_core.load` to serialize "
+        "prompts and `load`/`loads` to deserialize them.",
+    )
     def save(self, file_path: Path | str) -> None:
         """Save prompt to file.
 

libs/core/langchain_core/prompts/dict.py

@@ -4,6 +4,7 @@ import warnings
 from functools import cached_property
 from typing import Any, Literal, cast
 
+from pydantic import model_validator
 from typing_extensions import override
 
 from langchain_core.load import dumpd
@@ -21,11 +22,35 @@ class DictPromptTemplate(RunnableSerializable[dict, dict]):
     Recognizes variables in f-string or mustache formatted string dict values.
 
     Does NOT recognize variables in dict keys. Applies recursively.
+
+    Example:
+        ```python
+        prompt = DictPromptTemplate(
+            template={
+                "type": "text",
+                "text": "Hello {name}",
+                "metadata": {"source": "{source}"},
+            },
+            template_format="f-string",
+        )
+        prompt.format(name="Alice", source="docs")
+        # {
+        #     "type": "text",
+        #     "text": "Hello Alice",
+        #     "metadata": {"source": "docs"},
+        # }
+        ```
     """
 
     template: dict[str, Any]
     template_format: Literal["f-string", "mustache"]
 
+    @model_validator(mode="after")
+    def validate_template(self) -> "DictPromptTemplate":
+        """Validate that the template structure contains only safe variables."""
+        _get_input_variables(self.template, self.template_format)
+        return self
+
     @property
     def input_variables(self) -> list[str]:
         """Template input variables."""

libs/core/langchain_core/prompts/few_shot.py

@@ -12,6 +12,7 @@ from pydantic import (
 )
 from typing_extensions import override
 
+from langchain_core._api import deprecated
 from langchain_core.example_selectors import BaseExampleSelector
 from langchain_core.messages import BaseMessage, get_buffer_string
 from langchain_core.prompts.chat import BaseChatPromptTemplate
@@ -237,6 +238,12 @@ class FewShotPromptTemplate(_FewShotPromptTemplateMixin, StringPromptTemplate):
         """Return the prompt type key."""
         return "few_shot"
 
+    @deprecated(
+        since="1.2.21",
+        removal="2.0.0",
+        alternative="Use `dumpd`/`dumps` from `langchain_core.load` to serialize "
+        "prompts and `load`/`loads` to deserialize them.",
+    )
     def save(self, file_path: Path | str) -> None:
         """Save the prompt template to a file.
 

libs/core/langchain_core/prompts/few_shot_with_templates.py

@@ -6,6 +6,7 @@ from typing import Any
 from pydantic import ConfigDict, model_validator
 from typing_extensions import Self
 
+from langchain_core._api import deprecated
 from langchain_core.example_selectors import BaseExampleSelector
 from langchain_core.prompts.prompt import PromptTemplate
 from langchain_core.prompts.string import (
@@ -215,6 +216,12 @@ class FewShotPromptWithTemplates(StringPromptTemplate):
         """Return the prompt type key."""
         return "few_shot_with_templates"
 
+    @deprecated(
+        since="1.2.21",
+        removal="2.0.0",
+        alternative="Use `dumpd`/`dumps` from `langchain_core.load` to serialize "
+        "prompts and `load`/`loads` to deserialize them.",
+    )
     def save(self, file_path: Path | str) -> None:
         """Save the prompt to a file.
 

libs/core/langchain_core/prompts/image.py

@@ -9,12 +9,25 @@ from langchain_core.prompts.base import BasePromptTemplate
 from langchain_core.prompts.string import (
     DEFAULT_FORMATTER_MAPPING,
     PromptTemplateFormat,
+    get_template_variables,
 )
 from langchain_core.runnables import run_in_executor
 
 
 class ImagePromptTemplate(BasePromptTemplate[ImageURL]):
-    """Image prompt template for a multimodal model."""
+    """Image prompt template for a multimodal model.
+
+    Example:
+        ```python
+        prompt = ImagePromptTemplate(
+            input_variables=["image_id"],
+            template={"url": "https://example.com/{image_id}.png", "detail": "high"},
+            template_format="f-string",
+        )
+        prompt.format(image_id="cat")
+        # {"url": "https://example.com/cat.png", "detail": "high"}
+        ```
+    """
 
     template: dict = Field(default_factory=dict)
     """Template for the prompt."""
@@ -43,6 +56,13 @@ class ImagePromptTemplate(BasePromptTemplate[ImageURL]):
                 f" Found: {overlap}"
             )
             raise ValueError(msg)
+
+        template = kwargs.get("template", {})
+        template_format = kwargs.get("template_format", "f-string")
+        for value in template.values():
+            if isinstance(value, str):
+                get_template_variables(value, template_format)
+
         super().__init__(**kwargs)
 
     @property

libs/core/langchain_core/prompts/loading.py

@@ -7,6 +7,7 @@ from pathlib import Path
 
 import yaml
 
+from langchain_core._api import deprecated
 from langchain_core.output_parsers.string import StrOutputParser
 from langchain_core.prompts.base import BasePromptTemplate
 from langchain_core.prompts.chat import ChatPromptTemplate
@@ -17,11 +18,51 @@ URL_BASE = "https://raw.githubusercontent.com/hwchase17/langchain-hub/master/pro
 logger = logging.getLogger(__name__)
 
 
-def load_prompt_from_config(config: dict) -> BasePromptTemplate:
+def _validate_path(path: Path) -> None:
+    """Reject absolute paths and ``..`` traversal components.
+
+    Args:
+        path: The path to validate.
+
+    Raises:
+        ValueError: If the path is absolute or contains ``..`` components.
+    """
+    if path.is_absolute():
+        msg = (
+            f"Path '{path}' is absolute. Absolute paths are not allowed "
+            f"when loading prompt configurations to prevent path traversal "
+            f"attacks. Use relative paths instead, or pass "
+            f"`allow_dangerous_paths=True` if you trust the input."
+        )
+        raise ValueError(msg)
+    if ".." in path.parts:
+        msg = (
+            f"Path '{path}' contains '..' components. Directory traversal "
+            f"sequences are not allowed when loading prompt configurations. "
+            f"Use direct relative paths instead, or pass "
+            f"`allow_dangerous_paths=True` if you trust the input."
+        )
+        raise ValueError(msg)
+
+
+@deprecated(
+    since="1.2.21",
+    removal="2.0.0",
+    alternative="Use `dumpd`/`dumps` from `langchain_core.load` to serialize "
+    "prompts and `load`/`loads` to deserialize them.",
+)
+def load_prompt_from_config(
+    config: dict, *, allow_dangerous_paths: bool = False
+) -> BasePromptTemplate:
     """Load prompt from config dict.
 
     Args:
         config: Dict containing the prompt configuration.
+        allow_dangerous_paths: If ``False`` (default), file paths in the
+            config (such as ``template_path``, ``examples``, and
+            ``example_prompt_path``) are validated to reject absolute paths
+            and directory traversal (``..``) sequences. Set to ``True`` only
+            if you trust the source of the config.
 
     Returns:
         A `PromptTemplate` object.
@@ -38,10 +79,12 @@ def load_prompt_from_config(config: dict) -> BasePromptTemplate:
         raise ValueError(msg)
 
     prompt_loader = type_to_loader_dict[config_type]
-    return prompt_loader(config)
+    return prompt_loader(config, allow_dangerous_paths=allow_dangerous_paths)
 
 
-def _load_template(var_name: str, config: dict) -> dict:
+def _load_template(
+    var_name: str, config: dict, *, allow_dangerous_paths: bool = False
+) -> dict:
     """Load template from the path if applicable."""
     # Check if template_path exists in config.
     if f"{var_name}_path" in config:
@@ -51,9 +94,14 @@ def _load_template(var_name: str, config: dict) -> dict:
             raise ValueError(msg)
         # Pop the template path from the config.
         template_path = Path(config.pop(f"{var_name}_path"))
+        if not allow_dangerous_paths:
+            _validate_path(template_path)
+        # Resolve symlinks before checking the suffix so that a symlink named
+        # "exploit.txt" pointing to a non-.txt file is caught.
+        resolved_path = template_path.resolve()
         # Load the template.
-        if template_path.suffix == ".txt":
-            template = template_path.read_text(encoding="utf-8")
+        if resolved_path.suffix == ".txt":
+            template = resolved_path.read_text(encoding="utf-8")
         else:
             raise ValueError
         # Set the template variable to the extracted variable.
@@ -61,12 +109,14 @@ def _load_template(var_name: str, config: dict) -> dict:
     return config
 
 
-def _load_examples(config: dict) -> dict:
+def _load_examples(config: dict, *, allow_dangerous_paths: bool = False) -> dict:
     """Load examples if necessary."""
     if isinstance(config["examples"], list):
         pass
     elif isinstance(config["examples"], str):
         path = Path(config["examples"])
+        if not allow_dangerous_paths:
+            _validate_path(path)
         with path.open(encoding="utf-8") as f:
             if path.suffix == ".json":
                 examples = json.load(f)
@@ -92,11 +142,17 @@ def _load_output_parser(config: dict) -> dict:
     return config
 
 
-def _load_few_shot_prompt(config: dict) -> FewShotPromptTemplate:
+def _load_few_shot_prompt(
+    config: dict, *, allow_dangerous_paths: bool = False
+) -> FewShotPromptTemplate:
     """Load the "few shot" prompt from the config."""
     # Load the suffix and prefix templates.
-    config = _load_template("suffix", config)
-    config = _load_template("prefix", config)
+    config = _load_template(
+        "suffix", config, allow_dangerous_paths=allow_dangerous_paths
+    )
+    config = _load_template(
+        "prefix", config, allow_dangerous_paths=allow_dangerous_paths
+    )
     # Load the example prompt.
     if "example_prompt_path" in config:
         if "example_prompt" in config:
@@ -105,19 +161,30 @@ def _load_few_shot_prompt(config: dict) -> FewShotPromptTemplate:
                 "be specified."
             )
             raise ValueError(msg)
-        config["example_prompt"] = load_prompt(config.pop("example_prompt_path"))
+        example_prompt_path = Path(config.pop("example_prompt_path"))
+        if not allow_dangerous_paths:
+            _validate_path(example_prompt_path)
+        config["example_prompt"] = load_prompt(
+            example_prompt_path, allow_dangerous_paths=allow_dangerous_paths
+        )
     else:
-        config["example_prompt"] = load_prompt_from_config(config["example_prompt"])
+        config["example_prompt"] = load_prompt_from_config(
+            config["example_prompt"], allow_dangerous_paths=allow_dangerous_paths
+        )
     # Load the examples.
-    config = _load_examples(config)
+    config = _load_examples(config, allow_dangerous_paths=allow_dangerous_paths)
     config = _load_output_parser(config)
     return FewShotPromptTemplate(**config)
 
 
-def _load_prompt(config: dict) -> PromptTemplate:
+def _load_prompt(
+    config: dict, *, allow_dangerous_paths: bool = False
+) -> PromptTemplate:
     """Load the prompt template from config."""
     # Load the template from disk if necessary.
-    config = _load_template("template", config)
+    config = _load_template(
+        "template", config, allow_dangerous_paths=allow_dangerous_paths
+    )
     config = _load_output_parser(config)
 
     template_format = config.get("template_format", "f-string")
@@ -134,12 +201,28 @@ def _load_prompt(config: dict) -> PromptTemplate:
     return PromptTemplate(**config)
 
 
-def load_prompt(path: str | Path, encoding: str | None = None) -> BasePromptTemplate:
+@deprecated(
+    since="1.2.21",
+    removal="2.0.0",
+    alternative="Use `dumpd`/`dumps` from `langchain_core.load` to serialize "
+    "prompts and `load`/`loads` to deserialize them.",
+)
+def load_prompt(
+    path: str | Path,
+    encoding: str | None = None,
+    *,
+    allow_dangerous_paths: bool = False,
+) -> BasePromptTemplate:
     """Unified method for loading a prompt from LangChainHub or local filesystem.
 
     Args:
         path: Path to the prompt file.
         encoding: Encoding of the file.
+        allow_dangerous_paths: If ``False`` (default), file paths referenced
+            inside the loaded config (such as ``template_path``, ``examples``,
+            and ``example_prompt_path``) are validated to reject absolute paths
+            and directory traversal (``..``) sequences. Set to ``True`` only
+            if you trust the source of the config.
 
     Returns:
         A `PromptTemplate` object.
@@ -154,11 +237,16 @@ def load_prompt(path: str | Path, encoding: str | None = None) -> BasePromptTemp
             "instead."
         )
         raise RuntimeError(msg)
-    return _load_prompt_from_file(path, encoding)
+    return _load_prompt_from_file(
+        path, encoding, allow_dangerous_paths=allow_dangerous_paths
+    )
 
 
 def _load_prompt_from_file(
-    file: str | Path, encoding: str | None = None
+    file: str | Path,
+    encoding: str | None = None,
+    *,
+    allow_dangerous_paths: bool = False,
 ) -> BasePromptTemplate:
     """Load prompt from file."""
     # Convert file to a Path object.
@@ -174,10 +262,14 @@ def _load_prompt_from_file(
         msg = f"Got unsupported file type {file_path.suffix}"
         raise ValueError(msg)
     # Load the prompt from the config now.
-    return load_prompt_from_config(config)
+    return load_prompt_from_config(config, allow_dangerous_paths=allow_dangerous_paths)
 
 
-def _load_chat_prompt(config: dict) -> ChatPromptTemplate:
+def _load_chat_prompt(
+    config: dict,
+    *,
+    allow_dangerous_paths: bool = False,  # noqa: ARG001
+) -> ChatPromptTemplate:
     """Load chat prompt from config."""
     messages = config.pop("messages")
     template = messages[0]["prompt"].pop("template") if messages else None
@@ -190,7 +282,7 @@ def _load_chat_prompt(config: dict) -> ChatPromptTemplate:
     return ChatPromptTemplate.from_template(template=template, **config)
 
 
-type_to_loader_dict: dict[str, Callable[[dict], BasePromptTemplate]] = {
+type_to_loader_dict: dict[str, Callable[..., BasePromptTemplate]] = {
     "prompt": _load_prompt,
     "few_shot": _load_few_shot_prompt,
     "chat": _load_chat_prompt,

libs/core/langchain_core/prompts/string.py

@@ -219,6 +219,46 @@ DEFAULT_VALIDATOR_MAPPING: dict[str, Callable] = {
 }
 
 
+def _parse_f_string_fields(template: str) -> list[tuple[str, str | None]]:
+    fields: list[tuple[str, str | None]] = []
+    for _, field_name, format_spec, _ in Formatter().parse(template):
+        if field_name is not None:
+            fields.append((field_name, format_spec))
+    return fields
+
+
+def validate_f_string_template(template: str) -> list[str]:
+    """Validate an f-string template and return its input variables."""
+    input_variables = set()
+    for var, format_spec in _parse_f_string_fields(template):
+        if "." in var or "[" in var or "]" in var:
+            msg = (
+                f"Invalid variable name {var!r} in f-string template. "
+                f"Variable names cannot contain attribute "
+                f"access (.) or indexing ([])."
+            )
+            raise ValueError(msg)
+
+        if var.isdigit():
+            msg = (
+                f"Invalid variable name {var!r} in f-string template. "
+                f"Variable names cannot be all digits as they are interpreted "
+                f"as positional arguments."
+            )
+            raise ValueError(msg)
+
+        if format_spec and ("{" in format_spec or "}" in format_spec):
+            msg = (
+                "Invalid format specifier in f-string template. "
+                "Nested replacement fields are not allowed."
+            )
+            raise ValueError(msg)
+
+        input_variables.add(var)
+
+    return sorted(input_variables)
+
+
 def check_valid_template(
     template: str, template_format: str, input_variables: list[str]
 ) -> None:
@@ -243,6 +283,8 @@ def check_valid_template(
             f" {list(DEFAULT_FORMATTER_MAPPING)}."
         )
         raise ValueError(msg) from exc
+    if template_format == "f-string":
+        validate_f_string_template(template)
     try:
         validator_func(template, input_variables)
     except (KeyError, IndexError) as exc:
@@ -268,43 +310,18 @@ def get_template_variables(template: str, template_format: str) -> list[str]:
     Raises:
         ValueError: If the template format is not supported.
     """
+    input_variables: list[str] | set[str]
     if template_format == "jinja2":
         # Get the variables for the template
-        input_variables = _get_jinja2_variables_from_template(template)
+        input_variables = sorted(_get_jinja2_variables_from_template(template))
     elif template_format == "f-string":
-        input_variables = {
-            v for _, v, _, _ in Formatter().parse(template) if v is not None
-        }
+        input_variables = validate_f_string_template(template)
     elif template_format == "mustache":
         input_variables = mustache_template_vars(template)
     else:
         msg = f"Unsupported template format: {template_format}"
         raise ValueError(msg)
 
-    # For f-strings, block attribute access and indexing syntax
-    # This prevents template injection attacks via accessing dangerous attributes
-    if template_format == "f-string":
-        for var in input_variables:
-            # Formatter().parse() returns field names with dots/brackets if present
-            # e.g., "obj.attr" or "obj[0]" - we need to block these
-            if "." in var or "[" in var or "]" in var:
-                msg = (
-                    f"Invalid variable name {var!r} in f-string template. "
-                    f"Variable names cannot contain attribute "
-                    f"access (.) or indexing ([])."
-                )
-                raise ValueError(msg)
-
-            # Block variable names that are all digits (e.g., "0", "100")
-            # These are interpreted as positional arguments, not keyword arguments
-            if var.isdigit():
-                msg = (
-                    f"Invalid variable name {var!r} in f-string template. "
-                    f"Variable names cannot be all digits as they are interpreted "
-                    f"as positional arguments."
-                )
-                raise ValueError(msg)
-
     return sorted(input_variables)
 
 

libs/core/langchain_core/runnables/__init__.py

@@ -3,7 +3,7 @@
 The LangChain Expression Language (LCEL) offers a declarative method to build
 production-grade programs that harness the power of LLMs.
 
-Programs created using LCEL and LangChain `Runnable` objects inherently suppor
+Programs created using LCEL and LangChain `Runnable` objects inherently support
 synchronous asynchronous, batch, and streaming operations.
 
 Support for **async** allows servers hosting LCEL based programs to scale bette for

libs/core/langchain_core/runnables/configurable.py

@@ -499,7 +499,7 @@ class RunnableConfigurableAlternatives(DynamicRunnable[Input, Output]):
         # When invoking the created RunnableSequence, you can pass in the
         # value for your ConfigurableField's id which in this case will either be
         # `joke` or `poem`.
-        chain = prompt | ChatOpenAI(model="gpt-3.5-turbo-0125", temperature=0)
+        chain = prompt | ChatOpenAI(model="gpt-5.4-mini")
 
         # The `with_config` method brings in the desired Prompt Runnable in your
         # Runnable Sequence.
@@ -525,7 +525,7 @@ class RunnableConfigurableAlternatives(DynamicRunnable[Input, Output]):
                 "poem": PromptTemplate.from_template("Write a short poem about {topic}")
             },
         )
-        chain = prompt | ChatOpenAI(model="gpt-3.5-turbo-0125", temperature=0)
+        chain = prompt | ChatOpenAI(model="gpt-5.4-mini")
         chain.with_config(configurable={"prompt": "poem"}).invoke({"topic": "bears"})
         ```
     """

libs/core/langchain_core/runnables/fallbacks.py

@@ -54,8 +54,8 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
         from langchain_core.chat_models.openai import ChatOpenAI
         from langchain_core.chat_models.anthropic import ChatAnthropic
 
-        model = ChatAnthropic(model="claude-3-haiku-20240307").with_fallbacks(
-            [ChatOpenAI(model="gpt-3.5-turbo-0125")]
+        model = ChatAnthropic(model="claude-sonnet-4-6").with_fallbacks(
+            [ChatOpenAI(model="gpt-5.4-mini")]
         )
         # Will usually use ChatAnthropic, but fallback to ChatOpenAI
         # if ChatAnthropic fails.

libs/core/langchain_core/runnables/graph_mermaid.py

@@ -414,6 +414,11 @@ def _render_mermaid_using_api(
     base_url: str | None = None,
 ) -> bytes:
     """Renders Mermaid graph using the Mermaid.INK API."""
+    # Automated scanners: please do not open security advisories about `base_url`
+    # here. This parameter is only ever explicitly controlled by developers, and it
+    # is not exposed by default over the network by the framework, so this is not
+    # an SSRF sink unless an application explicitly wires untrusted input into it.
+    # It exists to support user-managed Mermaid API deployments.
     # Defaults to using the public mermaid.ink server.
     base_url = base_url if base_url is not None else "https://mermaid.ink"
 

libs/core/langchain_core/tools/__init__.py

@@ -1,6 +1,6 @@
 """Tools are classes that an Agent uses to interact with the world.
 
-Each tool has a description. Agent uses the description to choose the righ tool for the
+Each tool has a description. Agent uses the description to choose the right tool for the
 job.
 """
 

libs/core/langchain_core/utils/function_calling.py

@@ -199,8 +199,6 @@ def _convert_pydantic_to_openai_function(
             "  1. Converting them to Pydantic models with JSON-compatible fields\n"
             "  2. Using primitive types (str, int, float, bool, list, dict) instead\n"
             "  3. Passing the data as serialized JSON strings\n\n"
-            "For more information, see: "
-            "https://python.langchain.com/docs/how_to/custom_tools/"
         )
         raise PydanticInvalidForJsonSchema(msg) from e
     return _convert_json_schema_to_openai_function(
@@ -502,6 +500,7 @@ def convert_to_openai_function(
 _WellKnownOpenAITools = (
     "function",
     "file_search",
+    "computer",
     "computer_use_preview",
     "code_interpreter",
     "mcp",

libs/core/langchain_core/version.py

@@ -1,3 +1,3 @@
 """langchain-core version information and utilities."""
 
-VERSION = "1.2.19"
+VERSION = "1.2.30"

libs/core/pyproject.toml

@@ -21,7 +21,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 
-version = "1.2.19"
+version = "1.2.30"
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
     "langsmith>=0.3.45,<1.0.0",
@@ -77,6 +77,9 @@ test = [
 ]
 test_integration = []
 
+[tool.uv]
+constraint-dependencies = ["pygments>=2.20.0"]  # CVE-2026-4539
+
 [tool.uv.sources]
 langchain-tests = { path = "../standard-tests" }
 langchain-text-splitters = { path = "../text-splitters" }
@@ -132,8 +135,10 @@ ignore-var-parameters = true  # ignore missing documentation for *args and **kwa
 "langchain_core/utils/mustache.py" = [ "PLW0603",]
 "langchain_core/sys_info.py" = [ "T201",]
 "tests/unit_tests/test_tools.py" = [ "ARG",]
-"tests/**" = [ "D1", "PLR2004", "S", "SLF",]
+"tests/**" = [ "ARG", "D1", "PLR2004", "S", "SLF",]
 "scripts/**" = [ "INP", "S", "T201",]
+"langchain_core/_security/_policy.py" = [ "EM101", "EM102", "TRY003", "B008", "TRY300",]
+"langchain_core/_security/_transport.py" = [ "EM101", "EM102", "TRY003", "TRY203", "B008",]
 
 [tool.coverage.run]
 omit = [ "tests/*",]

libs/core/scripts/lint_imports.sh

@@ -6,8 +6,9 @@ set -eu
 errors=0
 
 # make sure not importing from langchain or langchain_experimental
-git --no-pager grep '^from langchain\.' . && errors=$((errors+1))
-git --no-pager grep '^from langchain_experimental\.' . && errors=$((errors+1))
+# allow langchain.agents and langchain.tools (v1 middleware)
+git --no-pager grep "^from langchain\." . | grep -v ":from langchain\.agents" | grep -v ":from langchain\.tools" && errors=$((errors+1))
+git --no-pager grep "^from langchain_experimental\." . && errors=$((errors+1))
 
 # Decide on an exit status based on the errors
 if [ "$errors" -gt 0 ]; then

libs/core/tests/unit_tests/conftest.py

@@ -17,9 +17,6 @@ def blockbuster() -> Iterator[BlockBuster]:
                 bb.functions[func]
                 .can_block_in("langchain_core/_api/internal.py", "is_caller_internal")
                 .can_block_in("langchain_core/runnables/base.py", "__repr__")
-                .can_block_in(
-                    "langchain_core/beta/runnables/context.py", "aconfig_with_context"
-                )
             )
 
         for func in ["os.stat", "io.TextIOWrapper.read"]:

libs/core/tests/unit_tests/language_models/chat_models/test_base.py

@@ -6,7 +6,8 @@ from collections.abc import AsyncIterator, Iterator
 from typing import TYPE_CHECKING, Any, Literal
 
 import pytest
-from typing_extensions import override
+from pydantic import model_validator
+from typing_extensions import Self, override
 
 from langchain_core.callbacks import (
     CallbackManagerForLLMRun,
@@ -22,6 +23,7 @@ from langchain_core.language_models.fake_chat_models import (
     FakeListChatModelError,
     GenericFakeChatModel,
 )
+from langchain_core.language_models.model_profile import ModelProfile
 from langchain_core.messages import (
     AIMessage,
     AIMessageChunk,
@@ -1230,6 +1232,76 @@ def test_model_profiles() -> None:
     assert model_with_profile.profile == {"max_input_tokens": 100}
 
 
+def test_resolve_model_profile_hook_populates_profile() -> None:
+    """_resolve_model_profile is called when profile is None."""
+
+    class ResolverModel(GenericFakeChatModel):
+        def _resolve_model_profile(self) -> ModelProfile | None:
+            return {"max_input_tokens": 500}
+
+    model = ResolverModel(messages=iter([]))
+    assert model.profile == {"max_input_tokens": 500}
+
+
+def test_resolve_model_profile_hook_skipped_when_explicit() -> None:
+    """_resolve_model_profile is NOT called when profile is set explicitly."""
+
+    class ResolverModel(GenericFakeChatModel):
+        def _resolve_model_profile(self) -> ModelProfile | None:
+            return {"max_input_tokens": 500}
+
+    model = ResolverModel(messages=iter([]), profile={"max_input_tokens": 999})
+    assert model.profile is not None
+    assert model.profile["max_input_tokens"] == 999
+
+
+def test_resolve_model_profile_hook_exception_is_caught() -> None:
+    """Model is still usable if _resolve_model_profile raises."""
+
+    class BrokenProfileModel(GenericFakeChatModel):
+        def _resolve_model_profile(self) -> ModelProfile | None:
+            msg = "profile file not found"
+            raise RuntimeError(msg)
+
+    with warnings.catch_warnings(record=True):
+        warnings.simplefilter("always")
+        model = BrokenProfileModel(messages=iter([]))
+
+    assert model.profile is None
+
+
+def test_check_profile_keys_runs_despite_partner_override() -> None:
+    """Verify _check_profile_keys fires even when _set_model_profile is overridden.
+
+    Because _check_profile_keys has a distinct validator name from
+    _set_model_profile, a partner override of the latter does not suppress
+    the key-checking validator.
+    """
+
+    class PartnerModel(GenericFakeChatModel):
+        """Simulates a partner that overrides _set_model_profile."""
+
+        @model_validator(mode="after")
+        def _set_model_profile(self) -> Self:
+            if self.profile is None:
+                profile: dict[str, Any] = {
+                    "max_input_tokens": 100,
+                    "partner_only_field": True,
+                }
+                self.profile = profile  # type: ignore[assignment]
+            return self
+
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter("always")
+        model = PartnerModel(messages=iter([]))
+
+    assert model.profile is not None
+    assert model.profile.get("partner_only_field") is True
+    profile_warnings = [x for x in w if "Unrecognized keys" in str(x.message)]
+    assert len(profile_warnings) == 1
+    assert "partner_only_field" in str(profile_warnings[0].message)
+
+
 class MockResponse:
     """Mock response for testing _generate_response_from_error."""
 

libs/core/tests/unit_tests/language_models/test_model_profile.py

@@ -0,0 +1,87 @@
+"""Tests for model profile types and utilities."""
+
+import warnings
+from typing import Any
+from unittest.mock import patch
+
+from pydantic import BaseModel, ConfigDict, Field
+
+from langchain_core.language_models.model_profile import (
+    ModelProfile,
+    _warn_unknown_profile_keys,
+)
+
+
+class TestModelProfileExtraAllow:
+    """Verify extra='allow' on ModelProfile TypedDict."""
+
+    def test_accepts_declared_keys(self) -> None:
+        profile: ModelProfile = {"max_input_tokens": 100, "tool_calling": True}
+        assert profile["max_input_tokens"] == 100
+
+    def test_extra_keys_accepted_via_typed_dict(self) -> None:
+        """ModelProfile TypedDict allows extra keys at construction."""
+        profile = ModelProfile(
+            max_input_tokens=100,
+            unknown_future_field="value",  # type: ignore[typeddict-unknown-key]
+        )
+        assert profile["unknown_future_field"] == "value"  # type: ignore[typeddict-item]
+
+    def test_extra_keys_survive_pydantic_validation(self) -> None:
+        """Extra keys pass through even when parent model forbids extras."""
+
+        class StrictModel(BaseModel):
+            model_config = ConfigDict(extra="forbid")
+            profile: ModelProfile | None = Field(default=None)
+
+        m = StrictModel(
+            profile={
+                "max_input_tokens": 100,
+                "unknown_future_field": True,
+            }
+        )
+        assert m.profile is not None
+        assert m.profile.get("unknown_future_field") is True
+
+
+class TestWarnUnknownProfileKeys:
+    """Tests for _warn_unknown_profile_keys."""
+
+    def test_warns_on_extra_keys(self) -> None:
+        profile: dict[str, Any] = {
+            "max_input_tokens": 100,
+            "future_field": True,
+            "another": "val",
+        }
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter("always")
+            _warn_unknown_profile_keys(profile)  # type: ignore[arg-type]
+
+        assert len(w) == 1
+        assert "another" in str(w[0].message)
+        assert "future_field" in str(w[0].message)
+        assert "upgrading langchain-core" in str(w[0].message)
+
+    def test_silent_on_declared_keys_only(self) -> None:
+        profile: ModelProfile = {"max_input_tokens": 100, "tool_calling": True}
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter("always")
+            _warn_unknown_profile_keys(profile)
+
+        assert len(w) == 0
+
+    def test_silent_on_empty_profile(self) -> None:
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter("always")
+            _warn_unknown_profile_keys({})
+
+        assert len(w) == 0
+
+    def test_survives_get_type_hints_failure(self) -> None:
+        """Falls back to silent skip on TypeError from get_type_hints."""
+        profile: dict[str, Any] = {"max_input_tokens": 100, "extra": True}
+        with patch(
+            "langchain_core.language_models.model_profile.get_type_hints",
+            side_effect=TypeError("broken"),
+        ):
+            _warn_unknown_profile_keys(profile)  # type: ignore[arg-type]

libs/core/tests/unit_tests/load/test_serializable.py

@@ -1,3 +1,4 @@
+import contextlib
 import json
 from typing import Any
 
@@ -6,7 +7,9 @@ from pydantic import BaseModel, ConfigDict, Field, SecretStr
 
 from langchain_core.documents import Document
 from langchain_core.load import InitValidator, Serializable, dumpd, dumps, load, loads
+from langchain_core.load.load import ALL_SERIALIZABLE_MAPPINGS
 from langchain_core.load.serializable import _is_field_useful
+from langchain_core.load.validators import CLASS_INIT_VALIDATORS, _bedrock_validator
 from langchain_core.messages import AIMessage
 from langchain_core.outputs import ChatGeneration, Generation
 from langchain_core.prompts import (
@@ -891,3 +894,267 @@ class TestJinja2SecurityBlocking:
         # jinja2 should be blocked by default
         with pytest.raises(ValueError, match="Jinja2 templates are not allowed"):
             load(serialized_jinja2, allowed_objects=[PromptTemplate])
+
+
+class TestClassSpecificValidatorsInLoad:
+    """Tests that load() properly integrates with class-specific validators."""
+
+    def test_validator_registry_keys_in_serializable_mapping(self) -> None:
+        """All CLASS_INIT_VALIDATORS keys must exist in ALL_SERIALIZABLE_MAPPINGS."""
+        all_known_paths = set(ALL_SERIALIZABLE_MAPPINGS.keys()) | set(
+            ALL_SERIALIZABLE_MAPPINGS.values()
+        )
+        for key in CLASS_INIT_VALIDATORS:
+            assert key in all_known_paths, (
+                f"{key} in CLASS_INIT_VALIDATORS but not in "
+                f"ALL_SERIALIZABLE_MAPPINGS keys or values"
+            )
+
+    def test_init_validator_still_called_without_class_validator(self) -> None:
+        """Test init_validator fires for classes without a class-specific validator."""
+        msg = AIMessage(content="test")
+        serialized = dumpd(msg)
+
+        init_validator_called = []
+
+        def custom_init_validator(
+            _class_path: tuple[str, ...], _kwargs: dict[str, Any]
+        ) -> None:
+            init_validator_called.append(True)
+
+        loaded = load(
+            serialized,
+            allowed_objects=[AIMessage],
+            init_validator=custom_init_validator,
+        )
+        assert loaded == msg
+        assert len(init_validator_called) == 1
+
+    def test_load_blocks_bedrock_with_endpoint_url(self) -> None:
+        """Test that load() blocks Bedrock deserialization with `endpoint_url`."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain", "chat_models", "bedrock", "ChatBedrock"],
+            "kwargs": {
+                "model_id": "anthropic.claude-v2",
+                "endpoint_url": "http://169.254.169.254/latest/meta-data",
+            },
+        }
+        with pytest.raises(ValueError, match="SSRF"):
+            load(payload, allowed_objects="all")
+
+    def test_load_blocks_bedrock_chat_legacy_alias(self) -> None:
+        """Test that load() blocks BedrockChat (legacy alias) with `endpoint_url`."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain", "chat_models", "bedrock", "BedrockChat"],
+            "kwargs": {
+                "model_id": "anthropic.claude-v2",
+                "endpoint_url": "http://169.254.169.254/latest/meta-data",
+            },
+        }
+        with pytest.raises(ValueError, match="SSRF"):
+            load(payload, allowed_objects="all")
+
+    def test_load_blocks_bedrock_converse_with_base_url(self) -> None:
+        """Test that load() blocks ChatBedrockConverse with `base_url`."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain_aws", "chat_models", "ChatBedrockConverse"],
+            "kwargs": {
+                "model": "anthropic.claude-v2",
+                "base_url": "http://malicious-site.com",
+            },
+        }
+        with pytest.raises(ValueError, match="SSRF"):
+            load(payload, allowed_objects="all")
+
+    def test_load_blocks_anthropic_bedrock_legacy_alias(self) -> None:
+        """Test load() blocks ChatAnthropicBedrock with `endpoint_url`."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": [
+                "langchain",
+                "chat_models",
+                "anthropic_bedrock",
+                "ChatAnthropicBedrock",
+            ],
+            "kwargs": {
+                "model_id": "anthropic.claude-v2",
+                "endpoint_url": "http://169.254.169.254/latest/meta-data",
+            },
+        }
+        with pytest.raises(ValueError, match="SSRF"):
+            load(payload, allowed_objects="all")
+
+    def test_load_blocks_anthropic_bedrock_via_resolved_path(self) -> None:
+        """Test load() blocks ChatAnthropicBedrock via resolved import path."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": [
+                "langchain_aws",
+                "chat_models",
+                "anthropic",
+                "ChatAnthropicBedrock",
+            ],
+            "kwargs": {
+                "model_id": "anthropic.claude-v2",
+                "base_url": "http://malicious-site.com",
+            },
+        }
+        with pytest.raises(ValueError, match="SSRF"):
+            load(payload, allowed_objects="all")
+
+    def test_load_blocks_bedrock_via_resolved_import_path(self) -> None:
+        """Test load() blocks Bedrock via resolved import path (bypass defense)."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": [
+                "langchain_aws",
+                "chat_models",
+                "bedrock_converse",
+                "ChatBedrockConverse",
+            ],
+            "kwargs": {
+                "model": "anthropic.claude-v2",
+                "endpoint_url": "http://169.254.169.254/latest/meta-data",
+            },
+        }
+        with pytest.raises(ValueError, match="SSRF"):
+            load(payload, allowed_objects="all")
+
+    def test_both_class_and_general_validators_fire(self) -> None:
+        """Test both class-specific and general init_validator fire together."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain", "llms", "bedrock", "Bedrock"],
+            "kwargs": {
+                "model_id": "anthropic.claude-v2",
+                "region_name": "us-west-2",
+            },
+        }
+
+        init_validator_called: list[bool] = []
+
+        def custom_init_validator(
+            _class_path: tuple[str, ...], _kwargs: dict[str, Any]
+        ) -> None:
+            init_validator_called.append(True)
+
+        # May fail at import time if langchain_aws not installed, that's OK.
+        # We only care that the init_validator was called before that point.
+        with contextlib.suppress(ModuleNotFoundError):
+            load(
+                payload,
+                allowed_objects="all",
+                init_validator=custom_init_validator,
+            )
+
+        assert len(init_validator_called) == 1
+
+    def test_load_blocks_bedrock_llm_via_resolved_path(self) -> None:
+        """Test load() blocks BedrockLLM via resolved import path."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain_aws", "llms", "bedrock", "BedrockLLM"],
+            "kwargs": {
+                "model_id": "anthropic.claude-v2",
+                "endpoint_url": "http://169.254.169.254/latest/meta-data",
+            },
+        }
+        with pytest.raises(ValueError, match="SSRF"):
+            load(payload, allowed_objects="all")
+
+    def test_load_blocks_chat_bedrock_via_resolved_path(self) -> None:
+        """Test load() blocks ChatBedrock via resolved JS import path."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain_aws", "chat_models", "ChatBedrock"],
+            "kwargs": {
+                "model_id": "anthropic.claude-v2",
+                "base_url": "http://malicious-site.com",
+            },
+        }
+        with pytest.raises(ValueError, match="SSRF"):
+            load(payload, allowed_objects="all")
+
+    def test_class_validator_fires_with_init_validator_none(self) -> None:
+        """Class-specific validators cannot be bypassed via init_validator=None."""
+        payload = {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain", "chat_models", "bedrock", "ChatBedrock"],
+            "kwargs": {
+                "model_id": "anthropic.claude-v2",
+                "endpoint_url": "http://169.254.169.254/latest/meta-data",
+            },
+        }
+        with pytest.raises(ValueError, match="SSRF"):
+            load(payload, allowed_objects="all", init_validator=None)
+
+
+class TestBedrockValidators:
+    """Tests for Bedrock SSRF protection validator."""
+
+    def test_bedrock_validator_blocks_endpoint_url(self) -> None:
+        """Test that `_bedrock_validator` blocks `endpoint_url` parameter."""
+        class_path = ("langchain", "llms", "bedrock", "BedrockLLM")
+        kwargs = {
+            "model_id": "us.anthropic.claude-sonnet-4-5-20250929-v1:0",
+            "region_name": "us-west-2",
+            "endpoint_url": "http://169.254.169.254/latest/meta-data",
+        }
+
+        with pytest.raises(ValueError, match=r"endpoint_url.*SSRF"):
+            _bedrock_validator(class_path, kwargs)
+
+    def test_bedrock_validator_blocks_base_url(self) -> None:
+        """Test that `_bedrock_validator` blocks `base_url` parameter."""
+        class_path = ("langchain_aws", "chat_models", "ChatBedrockConverse")
+        kwargs = {
+            "model": "us.anthropic.claude-sonnet-4-5-20250929-v1:0",
+            "region_name": "us-west-2",
+            "base_url": "http://malicious-site.com",
+        }
+
+        with pytest.raises(ValueError, match=r"base_url.*SSRF"):
+            _bedrock_validator(class_path, kwargs)
+
+    def test_bedrock_validator_blocks_both_parameters(self) -> None:
+        """Test that `_bedrock_validator` blocks when both params are present."""
+        class_path = ("langchain", "chat_models", "bedrock", "ChatBedrock")
+        kwargs = {
+            "model_id": "us.anthropic.claude-sonnet-4-5-20250929-v1:0",
+            "region_name": "us-west-2",
+            "endpoint_url": "http://attacker.com",
+            "base_url": "http://another-attacker.com",
+        }
+
+        with pytest.raises(ValueError, match="SSRF") as exc_info:
+            _bedrock_validator(class_path, kwargs)
+
+        error_msg = str(exc_info.value)
+        assert "endpoint_url" in error_msg
+        assert "base_url" in error_msg
+
+    def test_bedrock_validator_allows_safe_parameters(self) -> None:
+        """Test that `_bedrock_validator` allows safe parameters through."""
+        class_path = ("langchain", "llms", "bedrock", "Bedrock")
+        kwargs = {
+            "model_id": "us.anthropic.claude-sonnet-4-5-20250929-v1:0",
+            "region_name": "us-west-2",
+            "credentials_profile_name": "default",
+            "streaming": True,
+            "model_kwargs": {"temperature": 0.7},
+        }
+
+        _bedrock_validator(class_path, kwargs)

libs/core/tests/unit_tests/output_parsers/test_openai_tools.py

@@ -815,7 +815,7 @@ def test_parse_with_different_pydantic_2_v1() -> None:
         temperature: int
         forecast: str
 
-    # Can't get pydantic to work here due to the odd typing of tryig to support
+    # Can't get pydantic to work here due to the odd typing of trying to support
     # both v1 and v2 in the same codebase.
     parser = PydanticToolsParser(tools=[Forecast])
     message = AIMessage(
@@ -848,7 +848,7 @@ def test_parse_with_different_pydantic_2_proper() -> None:
         temperature: int
         forecast: str
 
-    # Can't get pydantic to work here due to the odd typing of tryig to support
+    # Can't get pydantic to work here due to the odd typing of trying to support
     # both v1 and v2 in the same codebase.
     parser = PydanticToolsParser(tools=[Forecast])
     message = AIMessage(

libs/core/tests/unit_tests/prompts/test_chat.py

@@ -1951,6 +1951,24 @@ def test_fstring_rejects_invalid_identifier_variable_names() -> None:
         assert result.messages[0].content == expected  # type: ignore[attr-defined]
 
 
+def test_fstring_rejects_nested_replacement_field_in_image_url() -> None:
+    with pytest.raises(ValueError, match="Nested replacement fields are not allowed"):
+        ChatPromptTemplate.from_messages(
+            [
+                (
+                    "human",
+                    [
+                        {
+                            "type": "image_url",
+                            "image_url": {"url": "{img:{img.__class__.__name__}}"},
+                        }
+                    ],
+                )
+            ],
+            template_format="f-string",
+        )
+
+
 def test_mustache_template_attribute_access_vulnerability() -> None:
     """Test that Mustache template injection is blocked.
 

libs/core/tests/unit_tests/prompts/test_dict.py

@@ -1,4 +1,9 @@
-from langchain_core.load import load
+import json
+
+import pytest
+
+from langchain_core.load import load, loads
+from langchain_core.prompts import PromptTemplate
 from langchain_core.prompts.dict import DictPromptTemplate
 
 
@@ -32,3 +37,82 @@ def test_deserialize_legacy() -> None:
         template={"type": "audio", "audio": "{audio_data}"}, template_format="f-string"
     )
     assert load(ser, allowed_objects=[DictPromptTemplate]) == expected
+
+
+def test_dict_prompt_template_rejects_attribute_access_to_rich_objects() -> None:
+    with pytest.raises(ValueError, match="Variable names cannot contain attribute"):
+        DictPromptTemplate(
+            template={"output": "{message.additional_kwargs[secret]}"},
+            template_format="f-string",
+        )
+
+
+def test_dict_prompt_template_loads_payload_rejects_attribute_access() -> None:
+    payload = json.dumps(
+        {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain_core", "prompts", "dict", "DictPromptTemplate"],
+            "kwargs": {
+                "template": {"output": "{message.additional_kwargs[secret]}"},
+                "template_format": "f-string",
+            },
+        }
+    )
+
+    with pytest.raises(ValueError, match="Variable names cannot contain attribute"):
+        loads(payload)
+
+
+def test_dict_prompt_template_dumpd_round_trip_rejects_attribute_access() -> None:
+    payload = {
+        "lc": 1,
+        "type": "constructor",
+        "id": ["langchain_core", "prompts", "dict", "DictPromptTemplate"],
+        "kwargs": {
+            "template": {"output": "{message.additional_kwargs[secret]}"},
+            "template_format": "f-string",
+        },
+    }
+
+    with pytest.raises(ValueError, match="Variable names cannot contain attribute"):
+        load(payload, allowed_objects=[DictPromptTemplate])
+
+
+def test_dict_prompt_template_deserialization_rejects_attribute_access() -> None:
+    payload = json.dumps(
+        {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain_core", "prompts", "dict", "DictPromptTemplate"],
+            "kwargs": {
+                "template": {"output": "{name.__class__.__name__}"},
+                "template_format": "f-string",
+            },
+        }
+    )
+
+    with pytest.raises(ValueError, match="Variable names cannot contain attribute"):
+        loads(payload)
+
+
+def test_dict_prompt_template_legacy_deserialization_rejects_attribute_access() -> None:
+    ser = {
+        "type": "constructor",
+        "lc": 1,
+        "id": ["langchain_core", "prompts", "message", "_DictMessagePromptTemplate"],
+        "kwargs": {
+            "template_format": "f-string",
+            "template": {"output": "{name.__class__.__name__}"},
+        },
+    }
+
+    with pytest.raises(ValueError, match="Variable names cannot contain attribute"):
+        load(ser, allowed_objects=[DictPromptTemplate])
+
+
+def test_prompt_template_blocks_attribute_access() -> None:
+    with pytest.raises(
+        ValueError, match="Variable names cannot contain attribute access"
+    ):
+        PromptTemplate.from_template("{name.__class__}", template_format="f-string")

libs/core/tests/unit_tests/prompts/test_image.py

@@ -1,7 +1,10 @@
 import json
 
+import pytest
+
 from langchain_core.load import dump, loads
 from langchain_core.prompts import ChatPromptTemplate
+from langchain_core.prompts.image import ImagePromptTemplate
 
 
 def test_image_prompt_template_deserializable() -> None:
@@ -107,3 +110,31 @@ def test_image_prompt_template_deserializable_old() -> None:
             }
         ),
     )
+
+
+def test_image_prompt_template_rejects_attribute_access_in_template_values() -> None:
+    with pytest.raises(ValueError, match="Variable names cannot contain attribute"):
+        ImagePromptTemplate(
+            input_variables=["image"],
+            template={"url": "https://example.com/{image.__class__.__name__}.png"},
+        )
+
+
+def test_image_prompt_template_deserialization_rejects_attribute_access() -> None:
+    payload = json.dumps(
+        {
+            "lc": 1,
+            "type": "constructor",
+            "id": ["langchain", "prompts", "image", "ImagePromptTemplate"],
+            "kwargs": {
+                "template": {
+                    "url": "https://example.com/{image.__class__.__name__}.png"
+                },
+                "input_variables": ["image"],
+                "template_format": "f-string",
+            },
+        }
+    )
+
+    with pytest.raises(ValueError, match="Variable names cannot contain attribute"):
+        loads(payload)

libs/core/tests/unit_tests/prompts/test_loading.py

@@ -1,5 +1,6 @@
 """Test loading functionality."""
 
+import json
 import os
 from collections.abc import Iterator
 from contextlib import contextmanager
@@ -7,8 +8,14 @@ from pathlib import Path
 
 import pytest
 
+from langchain_core._api import suppress_langchain_deprecation_warning
 from langchain_core.prompts.few_shot import FewShotPromptTemplate
-from langchain_core.prompts.loading import load_prompt
+from langchain_core.prompts.loading import (
+    _load_examples,
+    _load_template,
+    load_prompt,
+    load_prompt_from_config,
+)
 from langchain_core.prompts.prompt import PromptTemplate
 
 EXAMPLE_DIR = (Path(__file__).parent.parent / "examples").absolute()
@@ -27,7 +34,8 @@ def change_directory(dir_path: Path) -> Iterator[None]:
 
 def test_loading_from_yaml() -> None:
     """Test loading from yaml file."""
-    prompt = load_prompt(EXAMPLE_DIR / "simple_prompt.yaml")
+    with suppress_langchain_deprecation_warning():
+        prompt = load_prompt(EXAMPLE_DIR / "simple_prompt.yaml")
     expected_prompt = PromptTemplate(
         input_variables=["adjective"],
         partial_variables={"content": "dogs"},
@@ -38,7 +46,8 @@ def test_loading_from_yaml() -> None:
 
 def test_loading_from_json() -> None:
     """Test loading from json file."""
-    prompt = load_prompt(EXAMPLE_DIR / "simple_prompt.json")
+    with suppress_langchain_deprecation_warning():
+        prompt = load_prompt(EXAMPLE_DIR / "simple_prompt.json")
     expected_prompt = PromptTemplate(
         input_variables=["adjective", "content"],
         template="Tell me a {adjective} joke about {content}.",
@@ -49,14 +58,20 @@ def test_loading_from_json() -> None:
 def test_loading_jinja_from_json() -> None:
     """Test that loading jinja2 format prompts from JSON raises ValueError."""
     prompt_path = EXAMPLE_DIR / "jinja_injection_prompt.json"
-    with pytest.raises(ValueError, match=r".*can lead to arbitrary code execution.*"):
+    with (
+        suppress_langchain_deprecation_warning(),
+        pytest.raises(ValueError, match=r".*can lead to arbitrary code execution.*"),
+    ):
         load_prompt(prompt_path)
 
 
 def test_loading_jinja_from_yaml() -> None:
     """Test that loading jinja2 format prompts from YAML raises ValueError."""
     prompt_path = EXAMPLE_DIR / "jinja_injection_prompt.yaml"
-    with pytest.raises(ValueError, match=r".*can lead to arbitrary code execution.*"):
+    with (
+        suppress_langchain_deprecation_warning(),
+        pytest.raises(ValueError, match=r".*can lead to arbitrary code execution.*"),
+    ):
         load_prompt(prompt_path)
 
 
@@ -66,8 +81,9 @@ def test_saving_loading_round_trip(tmp_path: Path) -> None:
         input_variables=["adjective", "content"],
         template="Tell me a {adjective} joke about {content}.",
     )
-    simple_prompt.save(file_path=tmp_path / "prompt.yaml")
-    loaded_prompt = load_prompt(tmp_path / "prompt.yaml")
+    with suppress_langchain_deprecation_warning():
+        simple_prompt.save(file_path=tmp_path / "prompt.yaml")
+        loaded_prompt = load_prompt(tmp_path / "prompt.yaml")
     assert loaded_prompt == simple_prompt
 
     few_shot_prompt = FewShotPromptTemplate(
@@ -83,15 +99,18 @@ def test_saving_loading_round_trip(tmp_path: Path) -> None:
         ],
         suffix="Input: {adjective}\nOutput:",
     )
-    few_shot_prompt.save(file_path=tmp_path / "few_shot.yaml")
-    loaded_prompt = load_prompt(tmp_path / "few_shot.yaml")
+    with suppress_langchain_deprecation_warning():
+        few_shot_prompt.save(file_path=tmp_path / "few_shot.yaml")
+        loaded_prompt = load_prompt(tmp_path / "few_shot.yaml")
     assert loaded_prompt == few_shot_prompt
 
 
 def test_loading_with_template_as_file() -> None:
     """Test loading when the template is a file."""
-    with change_directory(EXAMPLE_DIR):
-        prompt = load_prompt("simple_prompt_with_template_file.json")
+    with change_directory(EXAMPLE_DIR), suppress_langchain_deprecation_warning():
+        prompt = load_prompt(
+            "simple_prompt_with_template_file.json", allow_dangerous_paths=True
+        )
         expected_prompt = PromptTemplate(
             input_variables=["adjective", "content"],
             template="Tell me a {adjective} joke about {content}.",
@@ -99,10 +118,233 @@ def test_loading_with_template_as_file() -> None:
         assert prompt == expected_prompt
 
 
+def test_load_template_rejects_absolute_path(tmp_path: Path) -> None:
+    secret = tmp_path / "secret.txt"
+    secret.write_text("SECRET")
+    config = {"template_path": str(secret)}
+    with pytest.raises(ValueError, match="is absolute"):
+        _load_template("template", config)
+
+
+def test_load_template_rejects_traversal() -> None:
+    config = {"template_path": "../../etc/secret.txt"}
+    with pytest.raises(ValueError, match=r"contains '\.\.' components"):
+        _load_template("template", config)
+
+
+def test_load_template_allows_dangerous_paths_when_opted_in(tmp_path: Path) -> None:
+    secret = tmp_path / "secret.txt"
+    secret.write_text("SECRET")
+    config = {"template_path": str(secret)}
+    result = _load_template("template", config, allow_dangerous_paths=True)
+    assert result["template"] == "SECRET"
+
+
+def test_load_examples_rejects_absolute_path(tmp_path: Path) -> None:
+    examples_file = tmp_path / "examples.json"
+    examples_file.write_text(json.dumps([{"input": "a", "output": "b"}]))
+    config = {"examples": str(examples_file)}
+    with pytest.raises(ValueError, match="is absolute"):
+        _load_examples(config)
+
+
+def test_load_examples_rejects_traversal() -> None:
+    config = {"examples": "../../secrets/data.json"}
+    with pytest.raises(ValueError, match=r"contains '\.\.' components"):
+        _load_examples(config)
+
+
+def test_load_examples_allows_dangerous_paths_when_opted_in(tmp_path: Path) -> None:
+    examples_file = tmp_path / "examples.json"
+    examples_file.write_text(json.dumps([{"input": "a", "output": "b"}]))
+    config = {"examples": str(examples_file)}
+    result = _load_examples(config, allow_dangerous_paths=True)
+    assert result["examples"] == [{"input": "a", "output": "b"}]
+
+
+def test_load_prompt_from_config_rejects_absolute_template_path(
+    tmp_path: Path,
+) -> None:
+    secret = tmp_path / "secret.txt"
+    secret.write_text("SECRET")
+    config = {
+        "_type": "prompt",
+        "template_path": str(secret),
+        "input_variables": [],
+    }
+    with (
+        suppress_langchain_deprecation_warning(),
+        pytest.raises(ValueError, match="is absolute"),
+    ):
+        load_prompt_from_config(config)
+
+
+def test_load_prompt_from_config_rejects_traversal_template_path() -> None:
+    config = {
+        "_type": "prompt",
+        "template_path": "../../../tmp/secret.txt",
+        "input_variables": [],
+    }
+    with (
+        suppress_langchain_deprecation_warning(),
+        pytest.raises(ValueError, match=r"contains '\.\.' components"),
+    ):
+        load_prompt_from_config(config)
+
+
+def test_load_prompt_from_config_allows_dangerous_paths(tmp_path: Path) -> None:
+    secret = tmp_path / "secret.txt"
+    secret.write_text("SECRET")
+    config = {
+        "_type": "prompt",
+        "template_path": str(secret),
+        "input_variables": [],
+    }
+    with suppress_langchain_deprecation_warning():
+        prompt = load_prompt_from_config(config, allow_dangerous_paths=True)
+    assert isinstance(prompt, PromptTemplate)
+    assert prompt.template == "SECRET"
+
+
+def test_load_prompt_from_config_few_shot_rejects_traversal_examples() -> None:
+    config = {
+        "_type": "few_shot",
+        "input_variables": ["query"],
+        "prefix": "Examples:",
+        "example_prompt": {
+            "_type": "prompt",
+            "input_variables": ["input", "output"],
+            "template": "{input}: {output}",
+        },
+        "examples": "../../../../.docker/config.json",
+        "suffix": "Query: {query}",
+    }
+    with (
+        suppress_langchain_deprecation_warning(),
+        pytest.raises(ValueError, match=r"contains '\.\.' components"),
+    ):
+        load_prompt_from_config(config)
+
+
+def test_load_prompt_from_config_few_shot_rejects_absolute_examples(
+    tmp_path: Path,
+) -> None:
+    examples_file = tmp_path / "examples.json"
+    examples_file.write_text(json.dumps([{"input": "a", "output": "b"}]))
+    config = {
+        "_type": "few_shot",
+        "input_variables": ["query"],
+        "prefix": "Examples:",
+        "example_prompt": {
+            "_type": "prompt",
+            "input_variables": ["input", "output"],
+            "template": "{input}: {output}",
+        },
+        "examples": str(examples_file),
+        "suffix": "Query: {query}",
+    }
+    with (
+        suppress_langchain_deprecation_warning(),
+        pytest.raises(ValueError, match="is absolute"),
+    ):
+        load_prompt_from_config(config)
+
+
+def test_load_prompt_from_config_few_shot_rejects_absolute_example_prompt_path(
+    tmp_path: Path,
+) -> None:
+    prompt_file = tmp_path / "prompt.json"
+    prompt_file.write_text(
+        json.dumps(
+            {
+                "_type": "prompt",
+                "template": "{input}: {output}",
+                "input_variables": ["input", "output"],
+            }
+        )
+    )
+    config = {
+        "_type": "few_shot",
+        "input_variables": ["query"],
+        "prefix": "Examples:",
+        "example_prompt_path": str(prompt_file),
+        "examples": [{"input": "a", "output": "b"}],
+        "suffix": "Query: {query}",
+    }
+    with (
+        suppress_langchain_deprecation_warning(),
+        pytest.raises(ValueError, match="is absolute"),
+    ):
+        load_prompt_from_config(config)
+
+
+def test_symlink_txt_to_py_is_blocked(tmp_path: Path) -> None:
+    """Test symlink redirects cannot get around file extension check."""
+    sensitive = tmp_path / "sensitive_source.py"
+    sensitive.write_text("INTERNAL_SECRET='ABC-123-XYZ'")
+    symlink = tmp_path / "exploit_link.txt"
+    symlink.symlink_to(sensitive)
+
+    config = {
+        "_type": "prompt",
+        "template_path": "exploit_link.txt",
+        "input_variables": [],
+    }
+    original_dir = Path.cwd()
+    try:
+        os.chdir(tmp_path)
+        with (
+            suppress_langchain_deprecation_warning(),
+            pytest.raises(ValueError),  # noqa: PT011
+        ):
+            load_prompt_from_config(config)
+    finally:
+        os.chdir(original_dir)
+
+
+def test_symlink_jinja2_rce_is_blocked(tmp_path: Path) -> None:
+    """Check jinja2 templates cannot be used to perform RCE via symlinks."""
+    payload = tmp_path / "rce_payload.py"
+    payload.write_text(
+        "{{ self.__init__.__globals__.__builtins__"
+        ".__import__('os').popen('id').read() }}"
+    )
+    symlink = tmp_path / "rce_bypass.txt"
+    symlink.symlink_to(payload)
+
+    config = {
+        "_type": "prompt",
+        "template_path": str(symlink),
+        "template_format": "jinja2",
+        "input_variables": [],
+    }
+    with (
+        suppress_langchain_deprecation_warning(),
+        pytest.raises(ValueError),  # noqa: PT011
+    ):
+        load_prompt_from_config(config, allow_dangerous_paths=True)
+
+
+def test_save_symlink_to_py_is_blocked(tmp_path: Path) -> None:
+    """Test that save() resolves symlinks before checking the file extension."""
+    target = tmp_path / "malicious.py"
+    symlink = tmp_path / "output.json"
+    symlink.symlink_to(target)
+
+    prompt = PromptTemplate(input_variables=["name"], template="Hello {name}")
+    with (
+        suppress_langchain_deprecation_warning(),
+        pytest.raises(ValueError, match="must be json or yaml"),
+    ):
+        prompt.save(symlink)
+
+    assert not target.exists()
+
+
 def test_loading_few_shot_prompt_from_yaml() -> None:
     """Test loading few shot prompt from yaml."""
-    with change_directory(EXAMPLE_DIR):
-        prompt = load_prompt("few_shot_prompt.yaml")
+    with change_directory(EXAMPLE_DIR), suppress_langchain_deprecation_warning():
+        prompt = load_prompt("few_shot_prompt.yaml", allow_dangerous_paths=True)
         expected_prompt = FewShotPromptTemplate(
             input_variables=["adjective"],
             prefix="Write antonyms for the following words.",
@@ -121,8 +363,8 @@ def test_loading_few_shot_prompt_from_yaml() -> None:
 
 def test_loading_few_shot_prompt_from_json() -> None:
     """Test loading few shot prompt from json."""
-    with change_directory(EXAMPLE_DIR):
-        prompt = load_prompt("few_shot_prompt.json")
+    with change_directory(EXAMPLE_DIR), suppress_langchain_deprecation_warning():
+        prompt = load_prompt("few_shot_prompt.json", allow_dangerous_paths=True)
         expected_prompt = FewShotPromptTemplate(
             input_variables=["adjective"],
             prefix="Write antonyms for the following words.",
@@ -141,8 +383,10 @@ def test_loading_few_shot_prompt_from_json() -> None:
 
 def test_loading_few_shot_prompt_when_examples_in_config() -> None:
     """Test loading few shot prompt when the examples are in the config."""
-    with change_directory(EXAMPLE_DIR):
-        prompt = load_prompt("few_shot_prompt_examples_in.json")
+    with change_directory(EXAMPLE_DIR), suppress_langchain_deprecation_warning():
+        prompt = load_prompt(
+            "few_shot_prompt_examples_in.json", allow_dangerous_paths=True
+        )
         expected_prompt = FewShotPromptTemplate(
             input_variables=["adjective"],
             prefix="Write antonyms for the following words.",
@@ -161,8 +405,10 @@ def test_loading_few_shot_prompt_when_examples_in_config() -> None:
 
 def test_loading_few_shot_prompt_example_prompt() -> None:
     """Test loading few shot when the example prompt is in its own file."""
-    with change_directory(EXAMPLE_DIR):
-        prompt = load_prompt("few_shot_prompt_example_prompt.json")
+    with change_directory(EXAMPLE_DIR), suppress_langchain_deprecation_warning():
+        prompt = load_prompt(
+            "few_shot_prompt_example_prompt.json", allow_dangerous_paths=True
+        )
         expected_prompt = FewShotPromptTemplate(
             input_variables=["adjective"],
             prefix="Write antonyms for the following words.",

libs/core/tests/unit_tests/prompts/test_string.py

@@ -1,7 +1,12 @@
 import pytest
 from packaging import version
 
-from langchain_core.prompts.string import get_template_variables, mustache_schema
+from langchain_core.prompts.string import (
+    check_valid_template,
+    get_template_variables,
+    mustache_schema,
+)
+from langchain_core.utils.formatting import formatter
 from langchain_core.utils.pydantic import PYDANTIC_VERSION
 
 PYDANTIC_VERSION_AT_LEAST_29 = version.parse("2.9") <= PYDANTIC_VERSION
@@ -39,3 +44,47 @@ def test_get_template_variables_mustache_nested() -> None:
     expected = ["user"]
     actual = get_template_variables(template, template_format)
     assert actual == expected
+
+
+def test_get_template_variables_rejects_nested_replacement_field_in_format_spec() -> (
+    None
+):
+    template = "{name:{name.__class__.__name__}}"
+
+    with pytest.raises(ValueError, match="Nested replacement fields are not allowed"):
+        get_template_variables(template, "f-string")
+
+
+def test_formatter_rejects_nested_replacement_field_in_format_spec() -> None:
+    template = "{name:{name.__class__.__name__}}"
+
+    with pytest.raises(ValueError, match="Invalid format specifier"):
+        formatter.format(template, name="hello")
+
+
+def test_check_valid_template_rejects_nested_replacement_field_in_format_spec() -> None:
+    template = "{name:{name.__class__.__name__}}"
+
+    with pytest.raises(ValueError, match="Nested replacement fields are not allowed"):
+        check_valid_template(template, "f-string", ["name"])
+
+
+@pytest.mark.parametrize(
+    ("template", "kwargs", "expected_variables", "expected_output"),
+    [
+        ("{value:.2f}", {"value": 3.14159}, ["value"], "3.14"),
+        ("{value:>10}", {"value": "cat"}, ["value"], "       cat"),
+        ("{value:*^10}", {"value": "cat"}, ["value"], "***cat****"),
+        ("{value:,}", {"value": 1234567}, ["value"], "1,234,567"),
+        ("{value:%}", {"value": 0.125}, ["value"], "12.500000%"),
+        ("{value!r}", {"value": "cat"}, ["value"], "'cat'"),
+    ],
+)
+def test_f_string_templates_allow_safe_format_specs(
+    template: str,
+    kwargs: dict[str, object],
+    expected_variables: list[str],
+    expected_output: str,
+) -> None:
+    assert get_template_variables(template, "f-string") == expected_variables
+    assert formatter.format(template, **kwargs) == expected_output

libs/core/tests/unit_tests/runnables/test_runnable_events_v2.py

@@ -2843,7 +2843,7 @@ async def test_tool_error_event_includes_tool_call_id() -> None:
     """Test that on_tool_error event includes tool_call_id when provided."""
 
     @tool
-    def failing_tool(x: int) -> str:  # noqa: ARG001
+    def failing_tool(x: int) -> str:
         """A tool that always fails."""
         msg = "Tool execution failed"
         raise ValueError(msg)
@@ -2883,7 +2883,7 @@ async def test_tool_error_event_tool_call_id_is_none_when_not_provided() -> None
     """Test that on_tool_error event has tool_call_id=None when not provided."""
 
     @tool
-    def failing_tool_no_id(x: int) -> str:  # noqa: ARG001
+    def failing_tool_no_id(x: int) -> str:
         """A tool that always fails."""
         msg = "Tool execution failed"
         raise ValueError(msg)

libs/core/tests/unit_tests/test_ssrf_policy_transport.py

@@ -0,0 +1,387 @@
+import socket
+from typing import Any
+from unittest.mock import patch
+
+import httpx
+import pytest
+
+from langchain_core._security import (
+    SSRFBlockedError,
+    SSRFPolicy,
+    SSRFSafeSyncTransport,
+    SSRFSafeTransport,
+    ssrf_safe_async_client,
+    ssrf_safe_client,
+    validate_hostname,
+    validate_resolved_ip,
+    validate_url_sync,
+)
+
+
+def _fake_addrinfo(ip: str, port: int = 80) -> list[Any]:
+    return [(socket.AF_INET, socket.SOCK_STREAM, 6, "", (ip, port))]
+
+
+def _fake_addrinfo_v6(ip: str, port: int = 80) -> list[Any]:
+    return [(socket.AF_INET6, socket.SOCK_STREAM, 6, "", (ip, port, 0, 0))]
+
+
+def _ok_response(request: httpx.Request) -> httpx.Response:
+    return httpx.Response(200, text="ok")
+
+
+def test_validate_resolved_ip_blocks_nat64_embedded_private_ip() -> None:
+    policy = SSRFPolicy()
+
+    with pytest.raises(SSRFBlockedError, match="private IP range"):
+        validate_resolved_ip("64:ff9b::c0a8:101", policy)
+
+
+def test_validate_resolved_ip_blocks_cgnat() -> None:
+    policy = SSRFPolicy()
+
+    with pytest.raises(SSRFBlockedError, match="private IP range"):
+        validate_resolved_ip("100.64.0.1", policy)
+
+
+def test_validate_hostname_blocks_kubernetes_internal_dns() -> None:
+    policy = SSRFPolicy()
+
+    with pytest.raises(SSRFBlockedError, match="Kubernetes internal DNS"):
+        validate_hostname("api.default.svc.cluster.local", policy)
+
+
+def test_validate_url_sync_allows_explicit_allowed_host() -> None:
+    policy = SSRFPolicy(allowed_hosts=frozenset({"metadata.google.internal"}))
+
+    validate_url_sync("http://metadata.google.internal/path", policy)
+
+
+def test_validate_url_sync_blocks_metadata_without_allowlist() -> None:
+    policy = SSRFPolicy()
+
+    with pytest.raises(SSRFBlockedError, match="cloud metadata endpoint"):
+        validate_url_sync("http://metadata.google.internal/path", policy)
+
+
+class _RecordingAsyncTransport(httpx.AsyncBaseTransport):
+    def __init__(self) -> None:
+        self.requests: list[httpx.Request] = []
+
+    async def handle_async_request(self, request: httpx.Request) -> httpx.Response:
+        self.requests.append(request)
+        return httpx.Response(200, request=request, text="ok")
+
+    async def aclose(self) -> None:
+        return None
+
+
+@pytest.mark.asyncio
+async def test_ssrf_safe_transport_pins_ip_and_sets_sni() -> None:
+    transport = SSRFSafeTransport()
+    recorder = _RecordingAsyncTransport()
+    transport._inner = recorder  # type: ignore[assignment]
+
+    addrinfo = [
+        (
+            socket.AF_INET,
+            socket.SOCK_STREAM,
+            6,
+            "",
+            ("93.184.216.34", 443),
+        )
+    ]
+
+    with patch(
+        "langchain_core._security._transport.socket.getaddrinfo",
+        return_value=addrinfo,
+    ):
+        request = httpx.Request("GET", "https://example.com/resource")
+        response = await transport.handle_async_request(request)
+
+    assert response.status_code == 200
+    assert len(recorder.requests) == 1
+    pinned_request = recorder.requests[0]
+    assert pinned_request.url.host == "93.184.216.34"
+    assert pinned_request.headers["host"] == "example.com"
+    assert pinned_request.extensions["sni_hostname"] == b"example.com"
+
+
+@pytest.mark.asyncio
+async def test_ssrf_safe_transport_blocks_private_resolution() -> None:
+    transport = SSRFSafeTransport()
+
+    addrinfo = [
+        (
+            socket.AF_INET,
+            socket.SOCK_STREAM,
+            6,
+            "",
+            ("127.0.0.1", 443),
+        )
+    ]
+
+    with patch(
+        "langchain_core._security._transport.socket.getaddrinfo",
+        return_value=addrinfo,
+    ):
+        request = httpx.Request("GET", "https://example.com/resource")
+        with pytest.raises(SSRFBlockedError, match="private IP range"):
+            await transport.handle_async_request(request)
+
+
+@pytest.mark.asyncio
+async def test_ssrf_safe_async_client_sets_redirect_defaults() -> None:
+    client = ssrf_safe_async_client()
+    try:
+        assert client.follow_redirects is True
+        assert client.max_redirects == 10
+    finally:
+        await client.aclose()
+
+
+# ---------------------------------------------------------------------------
+# Policy toggle: block_private_ips=False still blocks loopback/metadata/k8s
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.parametrize(
+    "url",
+    [
+        "http://10.0.0.1:8080/api",
+        "http://172.16.0.1:3000/",
+        "http://192.168.1.100/webhook",
+    ],
+)
+def test_private_ip_allowed_when_block_disabled(url: str) -> None:
+    policy = SSRFPolicy(block_private_ips=False)
+    validate_url_sync(url, policy)
+
+
+@pytest.mark.parametrize(
+    "url",
+    [
+        "http://127.0.0.1:8080/",
+        "http://127.0.0.2/",
+        "http://[::1]:8080/",
+    ],
+)
+def test_loopback_still_blocked_when_private_ips_allowed(url: str) -> None:
+    policy = SSRFPolicy(block_private_ips=False)
+    with pytest.raises(SSRFBlockedError):
+        validate_url_sync(url, policy)
+
+
+def test_docker_internal_blocked() -> None:
+    policy = SSRFPolicy()
+    with pytest.raises(SSRFBlockedError, match="localhost"):
+        validate_url_sync("http://host.docker.internal:8080/", policy)
+
+
+def test_metadata_still_blocked_when_private_ips_allowed() -> None:
+    policy = SSRFPolicy(block_private_ips=False)
+    with pytest.raises(SSRFBlockedError):
+        validate_url_sync("http://metadata.google.internal/", policy)
+
+
+def test_k8s_still_blocked_when_private_ips_allowed() -> None:
+    policy = SSRFPolicy(block_private_ips=False)
+    with pytest.raises(SSRFBlockedError):
+        validate_url_sync("http://myservice.default.svc.cluster.local/", policy)
+
+
+# ---------------------------------------------------------------------------
+# Transport: redirect to private IP blocked
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_redirect_to_private_ip_blocked(monkeypatch: Any) -> None:
+    call_count = 0
+
+    def _routing_addrinfo(*args: Any, **kwargs: Any) -> list[Any]:
+        nonlocal call_count
+        call_count += 1
+        if call_count == 1:
+            return _fake_addrinfo("93.184.216.34")
+        return _fake_addrinfo("127.0.0.1")
+
+    monkeypatch.setattr(socket, "getaddrinfo", _routing_addrinfo)
+
+    def _redirect_responder(request: httpx.Request) -> httpx.Response:
+        return httpx.Response(
+            302,
+            headers={"Location": "http://evil.com/pwned"},
+        )
+
+    transport = SSRFSafeTransport()
+    transport._inner = httpx.MockTransport(_redirect_responder)  # type: ignore[assignment]
+
+    client = httpx.AsyncClient(
+        transport=transport,
+        follow_redirects=True,
+        max_redirects=5,
+    )
+
+    with pytest.raises(SSRFBlockedError):
+        await client.get("http://safe.com/start")
+
+    await client.aclose()
+
+
+# ---------------------------------------------------------------------------
+# Transport: IPv6-mapped IPv4, scheme rejection, DNS fail-closed
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_ipv6_mapped_ipv4_blocked(monkeypatch: Any) -> None:
+    monkeypatch.setattr(
+        socket,
+        "getaddrinfo",
+        lambda *a, **kw: _fake_addrinfo_v6("::ffff:127.0.0.1"),
+    )
+
+    transport = SSRFSafeTransport()
+    request = httpx.Request("GET", "http://evil.com/")
+    with pytest.raises(SSRFBlockedError):
+        await transport.handle_async_request(request)
+
+
+@pytest.mark.asyncio
+async def test_scheme_blocked() -> None:
+    transport = SSRFSafeTransport()
+    request = httpx.Request("GET", "ftp://evil.com/file")
+    with pytest.raises(SSRFBlockedError, match="scheme"):
+        await transport.handle_async_request(request)
+
+
+@pytest.mark.asyncio
+async def test_unresolvable_host_blocked(monkeypatch: Any) -> None:
+    monkeypatch.setattr(
+        socket,
+        "getaddrinfo",
+        lambda *a, **kw: (_ for _ in ()).throw(
+            socket.gaierror("Name or service not known")
+        ),
+    )
+
+    transport = SSRFSafeTransport()
+    request = httpx.Request("GET", "http://nonexistent.invalid/")
+    with pytest.raises(SSRFBlockedError, match="DNS resolution failed"):
+        await transport.handle_async_request(request)
+
+
+# ---------------------------------------------------------------------------
+# Transport: allowed_hosts bypass and local env behavior
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_allowed_host_bypass() -> None:
+    policy = SSRFPolicy(allowed_hosts=frozenset({"special.host"}))
+    transport = SSRFSafeTransport(policy=policy)
+    transport._inner = httpx.MockTransport(_ok_response)  # type: ignore[assignment]
+
+    request = httpx.Request("GET", "http://special.host/api")
+    response = await transport.handle_async_request(request)
+    assert response.status_code == 200
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("env", ["local_dev", "local_test", "local_docker"])
+async def test_localhost_allowed_in_local_env(monkeypatch: Any, env: str) -> None:
+    monkeypatch.setenv("LANGCHAIN_ENV", env)
+    transport = SSRFSafeTransport()
+    transport._inner = httpx.MockTransport(_ok_response)  # type: ignore[assignment]
+
+    request = httpx.Request("GET", "http://localhost:8084/mcp")
+    response = await transport.handle_async_request(request)
+    assert response.status_code == 200
+
+
+@pytest.mark.asyncio
+async def test_localhost_blocked_in_production(monkeypatch: Any) -> None:
+    monkeypatch.setenv("LANGCHAIN_ENV", "production")
+    transport = SSRFSafeTransport()
+
+    request = httpx.Request("GET", "http://localhost:8084/mcp")
+    with pytest.raises(SSRFBlockedError):
+        await transport.handle_async_request(request)
+
+
+# ---------------------------------------------------------------------------
+# Sync transport tests
+# ---------------------------------------------------------------------------
+
+
+def test_sync_transport_pins_ip_and_sets_sni() -> None:
+    transport = SSRFSafeSyncTransport()
+    transport._inner = httpx.MockTransport(_ok_response)  # type: ignore[assignment]
+
+    addrinfo = [(socket.AF_INET, socket.SOCK_STREAM, 6, "", ("93.184.216.34", 443))]
+
+    with patch(
+        "langchain_core._security._transport.socket.getaddrinfo",
+        return_value=addrinfo,
+    ):
+        request = httpx.Request("GET", "https://example.com/resource")
+        response = transport.handle_request(request)
+
+    assert response.status_code == 200
+
+
+def test_sync_transport_blocks_private_resolution() -> None:
+    transport = SSRFSafeSyncTransport()
+
+    addrinfo = [(socket.AF_INET, socket.SOCK_STREAM, 6, "", ("127.0.0.1", 443))]
+
+    with patch(
+        "langchain_core._security._transport.socket.getaddrinfo",
+        return_value=addrinfo,
+    ):
+        request = httpx.Request("GET", "https://example.com/resource")
+        with pytest.raises(SSRFBlockedError, match="private IP range"):
+            transport.handle_request(request)
+
+
+def test_sync_transport_redirect_to_private_blocked(monkeypatch: Any) -> None:
+    call_count = 0
+
+    def _routing_addrinfo(*args: Any, **kwargs: Any) -> list[Any]:
+        nonlocal call_count
+        call_count += 1
+        if call_count == 1:
+            return _fake_addrinfo("93.184.216.34")
+        return _fake_addrinfo("127.0.0.1")
+
+    monkeypatch.setattr(socket, "getaddrinfo", _routing_addrinfo)
+
+    def _redirect_responder(request: httpx.Request) -> httpx.Response:
+        return httpx.Response(
+            302,
+            headers={"Location": "http://evil.com/pwned"},
+        )
+
+    transport = SSRFSafeSyncTransport()
+    transport._inner = httpx.MockTransport(_redirect_responder)  # type: ignore[assignment]
+
+    client = httpx.Client(
+        transport=transport,
+        follow_redirects=True,
+        max_redirects=5,
+    )
+
+    with pytest.raises(SSRFBlockedError):
+        client.get("http://safe.com/start")
+
+    client.close()
+
+
+def test_ssrf_safe_client_sets_redirect_defaults() -> None:
+    client = ssrf_safe_client()
+    try:
+        assert client.follow_redirects is True
+        assert client.max_redirects == 10
+    finally:
+        client.close()

libs/core/tests/unit_tests/test_ssrf_protection.py

@@ -8,80 +8,11 @@ from pydantic import BaseModel, ValidationError
 from langchain_core._security._ssrf_protection import (
     SSRFProtectedUrl,
     SSRFProtectedUrlRelaxed,
-    is_cloud_metadata,
-    is_localhost,
-    is_private_ip,
     is_safe_url,
     validate_safe_url,
 )
 
 
-class TestIPValidation:
-    """Tests for IP address validation functions."""
-
-    def test_is_private_ip_ipv4(self) -> None:
-        """Test private IPv4 address detection."""
-        assert is_private_ip("10.0.0.1") is True
-        assert is_private_ip("172.16.0.1") is True
-        assert is_private_ip("192.168.1.1") is True
-        assert is_private_ip("127.0.0.1") is True
-        assert is_private_ip("169.254.169.254") is True
-        assert is_private_ip("0.0.0.1") is True
-
-    def test_is_private_ip_ipv6(self) -> None:
-        """Test private IPv6 address detection."""
-        assert is_private_ip("::1") is True  # Loopback
-        assert is_private_ip("fc00::1") is True  # Unique local
-        assert is_private_ip("fe80::1") is True  # Link-local
-        assert is_private_ip("ff00::1") is True  # Multicast
-
-    def test_is_private_ip_public(self) -> None:
-        """Test that public IPs are not flagged as private."""
-        assert is_private_ip("8.8.8.8") is False
-        assert is_private_ip("1.1.1.1") is False
-        assert is_private_ip("151.101.1.140") is False
-
-    def test_is_private_ip_invalid(self) -> None:
-        """Test handling of invalid IP addresses."""
-        assert is_private_ip("not-an-ip") is False
-        assert is_private_ip("999.999.999.999") is False
-
-    def test_is_cloud_metadata_ips(self) -> None:
-        """Test cloud metadata IP detection."""
-        assert is_cloud_metadata("example.com", "169.254.169.254") is True
-        assert is_cloud_metadata("example.com", "169.254.170.2") is True
-        assert is_cloud_metadata("example.com", "100.100.100.200") is True
-
-    def test_is_cloud_metadata_hostnames(self) -> None:
-        """Test cloud metadata hostname detection."""
-        assert is_cloud_metadata("metadata.google.internal") is True
-        assert is_cloud_metadata("metadata") is True
-        assert is_cloud_metadata("instance-data") is True
-        assert is_cloud_metadata("METADATA.GOOGLE.INTERNAL") is True  # Case insensitive
-
-    def test_is_cloud_metadata_safe(self) -> None:
-        """Test that normal URLs are not flagged as cloud metadata."""
-        assert is_cloud_metadata("example.com", "8.8.8.8") is False
-        assert is_cloud_metadata("google.com") is False
-
-    def test_is_localhost_hostnames(self) -> None:
-        """Test localhost hostname detection."""
-        assert is_localhost("localhost") is True
-        assert is_localhost("LOCALHOST") is True
-        assert is_localhost("localhost.localdomain") is True
-
-    def test_is_localhost_ips(self) -> None:
-        """Test localhost IP detection."""
-        assert is_localhost("example.com", "127.0.0.1") is True
-        assert is_localhost("example.com", "::1") is True
-        assert is_localhost("example.com", "0.0.0.0") is True
-
-    def test_is_localhost_safe(self) -> None:
-        """Test that normal hosts are not flagged as localhost."""
-        assert is_localhost("example.com", "8.8.8.8") is False
-        assert is_localhost("google.com") is False
-
-
 class TestValidateSafeUrl:
     """Tests for validate_safe_url function."""
 
@@ -99,10 +30,10 @@ class TestValidateSafeUrl:
 
     def test_localhost_blocked_by_default(self) -> None:
         """Test that localhost URLs are blocked by default."""
-        with pytest.raises(ValueError, match="Localhost"):
+        with pytest.raises(ValueError, match="localhost"):
             validate_safe_url("http://localhost:8080/webhook")
 
-        with pytest.raises(ValueError, match="localhost"):
+        with pytest.raises(ValueError, match="private IP"):
             validate_safe_url("http://127.0.0.1:8080/webhook")
 
     def test_localhost_allowed_with_flag(self) -> None:
@@ -133,16 +64,26 @@ class TestValidateSafeUrl:
 
     def test_cloud_metadata_always_blocked(self) -> None:
         """Test that cloud metadata endpoints are always blocked."""
-        with pytest.raises(ValueError, match="metadata"):
+        with pytest.raises(ValueError, match="SSRF blocked"):
             validate_safe_url("http://169.254.169.254/latest/meta-data/")
 
         # Even with allow_private=True
-        with pytest.raises(ValueError, match="metadata"):
+        with pytest.raises(ValueError, match="SSRF blocked"):
             validate_safe_url(
                 "http://169.254.169.254/latest/meta-data/",
                 allow_private=True,
             )
 
+    def test_ipv6_mapped_ipv4_localhost_blocked(self) -> None:
+        """Test that IPv6-mapped IPv4 localhost is blocked."""
+        with pytest.raises(ValueError, match="SSRF blocked"):
+            validate_safe_url("http://[::ffff:127.0.0.1]:8080/webhook")
+
+    def test_ipv6_mapped_ipv4_cloud_metadata_blocked(self) -> None:
+        """Test that IPv6-mapped IPv4 cloud metadata is blocked."""
+        with pytest.raises(ValueError, match="SSRF blocked"):
+            validate_safe_url("http://[::ffff:169.254.169.254]/latest/meta-data/")
+
     def test_invalid_scheme_blocked(self) -> None:
         """Test that non-HTTP(S) schemes are blocked."""
         with pytest.raises(ValueError, match="scheme"):
@@ -156,7 +97,7 @@ class TestValidateSafeUrl:
 
     def test_https_only_mode(self) -> None:
         """Test that HTTP is blocked when allow_http=False."""
-        with pytest.raises(ValueError, match="HTTPS"):
+        with pytest.raises(ValueError, match="scheme"):
             validate_safe_url("http://example.com/webhook", allow_http=False)
 
         # HTTPS should still work

libs/core/tests/unit_tests/utils/test_function_calling.py

@@ -32,6 +32,7 @@ from langchain_core.utils.function_calling import (
     _convert_typed_dict_to_openai_function,
     convert_to_json_schema,
     convert_to_openai_function,
+    convert_to_openai_tool,
     tool_example_to_messages,
 )
 
@@ -1242,3 +1243,15 @@ def test_convert_to_openai_function_json_schema_missing_title_includes_schema()
     }
     with pytest.raises(ValueError, match="my_field"):
         convert_to_openai_function(schema_without_title)
+
+
+def test_convert_to_openai_tool_computer_passthrough() -> None:
+    """Test that the 'computer' tool type is passed through unchanged."""
+    computer_tool = {
+        "type": "computer",
+        "display_width": 1024,
+        "display_height": 768,
+        "environment": "browser",
+    }
+    result = convert_to_openai_tool(computer_tool)
+    assert result == computer_tool

libs/core/uv.lock

@@ -12,6 +12,9 @@ resolution-markers = [
     "python_full_version < '3.11' and platform_python_implementation != 'PyPy'",
 ]
 
+[manifest]
+constraints = [{ name = "pygments", specifier = ">=2.20.0" }]
+
 [[package]]
 name = "annotated-types"
 version = "0.7.0"
@@ -992,7 +995,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.19"
+version = "1.2.30"
 source = { editable = "." }
 dependencies = [
     { name = "jsonpatch" },
@@ -1086,7 +1089,7 @@ typing = [
 
 [[package]]
 name = "langchain-tests"
-version = "1.1.5"
+version = "1.1.6"
 source = { directory = "../standard-tests" }
 dependencies = [
     { name = "httpx" },
@@ -1162,11 +1165,8 @@ test = [
 test-integration = [
     { name = "en-core-web-sm", url = "https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-3.8.0/en_core_web_sm-3.8.0-py3-none-any.whl" },
     { name = "nltk", specifier = ">=3.9.1,<4.0.0" },
-    { name = "scipy", marker = "python_full_version == '3.12.*'", specifier = ">=1.7.0,<2.0.0" },
-    { name = "scipy", marker = "python_full_version >= '3.13'", specifier = ">=1.14.1,<2.0.0" },
-    { name = "sentence-transformers", specifier = ">=3.0.1,<6.0.0" },
-    { name = "spacy", marker = "python_full_version < '3.14'", specifier = ">=3.8.7,<4.0.0" },
-    { name = "thinc", specifier = ">=8.3.6,<10.0.0" },
+    { name = "sentence-transformers", specifier = ">=5.3.0,<6.0.0" },
+    { name = "spacy", specifier = ">=3.8.13,<4.0.0" },
     { name = "tiktoken", specifier = ">=0.8.0,<1.0.0" },
     { name = "transformers", specifier = ">=4.51.3,<6.0.0" },
 ]
@@ -1714,83 +1714,83 @@ wheels = [
 
 [[package]]
 name = "orjson"
-version = "3.11.5"
+version = "3.11.6"
 source = { registry = "https://pypi.org/simple" }
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+sdist = { url = "https://files.pythonhosted.org/packages/70/a3/4e09c61a5f0c521cba0bb433639610ae037437669f1a4cbc93799e731d78/orjson-3.11.6.tar.gz", hash = "sha256:0a54c72259f35299fd033042367df781c2f66d10252955ca1efb7db309b954cb", size = 6175856, upload-time = "2026-01-29T15:13:07.942Z" }
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@@ -2425,7 +2425,7 @@ wheels = [
 
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+version = "2.33.0"
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     { name = "certifi" },
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     { name = "urllib3" },
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 [[package]]

libs/langchain/Makefile

@@ -9,6 +9,7 @@ all: help
 
 # Define a variable for the test file path.
 TEST_FILE ?= tests/unit_tests/
+PYTEST_EXTRA ?=
 
 .EXPORT_ALL_VARIABLES:
 UV_FROZEN = true
@@ -22,10 +23,10 @@ coverage:
 		$(TEST_FILE)
 
 test tests:
-	uv run --group test pytest -n auto --disable-socket --allow-unix-socket $(TEST_FILE)
+	uv run --group test pytest -n auto $(PYTEST_EXTRA) --disable-socket --allow-unix-socket $(TEST_FILE)
 
 extended_tests:
-	uv run --group test pytest --disable-socket --allow-unix-socket --only-extended tests/unit_tests
+	uv run --group test pytest $(PYTEST_EXTRA) --disable-socket --allow-unix-socket --only-extended tests/unit_tests
 
 test_watch:
 	uv run --group test ptw --snapshot-update --now . -- -x --disable-socket --allow-unix-socket --disable-warnings tests/unit_tests

libs/langchain/langchain_classic/chat_models/base.py

@@ -392,10 +392,10 @@ def _init_chat_model_helper(
 
         return AzureChatOpenAI(model=model, **kwargs)
     if model_provider == "azure_ai":
-        _check_pkg("langchain_azure_ai", "AzureAIChatCompletionsModel")
-        from langchain_azure_ai.chat_models import AzureAIChatCompletionsModel
+        _check_pkg("langchain_azure_ai", "AzureAIOpenAIApiChatModel")
+        from langchain_azure_ai.chat_models import AzureAIOpenAIApiChatModel
 
-        return AzureAIChatCompletionsModel(model=model, **kwargs)
+        return AzureAIOpenAIApiChatModel(model=model, **kwargs)
     if model_provider == "cohere":
         _check_pkg("langchain_cohere", "ChatCohere")
         from langchain_cohere import ChatCohere

libs/langchain/langchain_classic/embeddings/base.py

@@ -6,6 +6,7 @@ from langchain_core.embeddings import Embeddings
 from langchain_core.runnables import Runnable
 
 _SUPPORTED_PROVIDERS = {
+    "azure_ai": "langchain_azure_ai",
     "azure_openai": "langchain_openai",
     "bedrock": "langchain_aws",
     "cohere": "langchain_cohere",
@@ -118,9 +119,10 @@ def _infer_model_and_provider(
 def _check_pkg(pkg: str) -> None:
     """Check if a package is installed."""
     if not util.find_spec(pkg):
+        pip_name = pkg.replace("_", "-")
         msg = (
             f"Could not import {pkg} python package. "
-            f"Please install it with `pip install {pkg}`"
+            f"Please install it with `pip install {pip_name}`"
         )
         raise ImportError(msg)
 
@@ -153,6 +155,7 @@ def init_embeddings(
             Supported providers:
 
             - `openai`                  -> [`langchain-openai`](https://docs.langchain.com/oss/python/integrations/providers/openai)
+            - `azure_ai`                -> [`langchain-azure-ai`](https://docs.langchain.com/oss/python/integrations/providers/microsoft)
             - `azure_openai`            -> [`langchain-openai`](https://docs.langchain.com/oss/python/integrations/providers/openai)
             - `bedrock`                 -> [`langchain-aws`](https://docs.langchain.com/oss/python/integrations/providers/aws)
             - `cohere`                  -> [`langchain-cohere`](https://docs.langchain.com/oss/python/integrations/providers/cohere)
@@ -201,14 +204,22 @@ def init_embeddings(
     pkg = _SUPPORTED_PROVIDERS[provider]
     _check_pkg(pkg)
 
-    if provider == "openai":
-        from langchain_openai import OpenAIEmbeddings
+    if provider == "azure_ai":
+        from langchain_azure_ai.embeddings import AzureAIOpenAIApiEmbeddingsModel
 
-        return OpenAIEmbeddings(model=model_name, **kwargs)
+        return AzureAIOpenAIApiEmbeddingsModel(model=model_name, **kwargs)
     if provider == "azure_openai":
         from langchain_openai import AzureOpenAIEmbeddings
 
         return AzureOpenAIEmbeddings(model=model_name, **kwargs)
+    if provider == "openai":
+        from langchain_openai import OpenAIEmbeddings
+
+        return OpenAIEmbeddings(model=model_name, **kwargs)
+    if provider == "bedrock":
+        from langchain_aws import BedrockEmbeddings
+
+        return BedrockEmbeddings(model_id=model_name, **kwargs)
     if provider == "google_genai":
         from langchain_google_genai import GoogleGenerativeAIEmbeddings
 
@@ -217,10 +228,6 @@ def init_embeddings(
         from langchain_google_vertexai import VertexAIEmbeddings
 
         return VertexAIEmbeddings(model=model_name, **kwargs)
-    if provider == "bedrock":
-        from langchain_aws import BedrockEmbeddings
-
-        return BedrockEmbeddings(model_id=model_name, **kwargs)
     if provider == "cohere":
         from langchain_cohere import CohereEmbeddings
 

libs/langchain/pyproject.toml

@@ -20,11 +20,11 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 
-version = "1.0.2"
+version = "1.0.3"
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
-    "langchain-core>=1.2.17,<2.0.0",
-    "langchain-text-splitters>=1.1.0,<2.0.0",
+    "langchain-core>=1.2.19,<2.0.0",
+    "langchain-text-splitters>=1.1.1,<2.0.0",
     "langsmith>=0.1.17,<1.0.0",
     "pydantic>=2.7.4,<3.0.0",
     "SQLAlchemy>=1.4.0,<3.0.0",
@@ -134,7 +134,7 @@ langchain-text-splitters = { path = "../text-splitters", editable = true }
 langchain-openai = { path = "../partners/openai", editable = true }
 
 [tool.uv]
-constraint-dependencies = ["urllib3>=2.6.3"]
+constraint-dependencies = ["urllib3>=2.6.3", "pygments>=2.20.0"]
 
 [tool.ruff]
 exclude = ["tests/integration_tests/examples/non-utf8-encoding.py"]

libs/langchain/tests/README.md

@@ -1,3 +0,0 @@
-# LangChain Tests
-
-[This guide has moved to the docs](https://python.langchain.com/docs/contributing/testing)

libs/langchain/tests/unit_tests/test_pytest_config.py

@@ -8,4 +8,4 @@ def test_socket_disabled() -> None:
     with pytest.raises(pytest_socket.SocketBlockedError):
         # Ignore S113 since we don't need a timeout here as the request
         # should fail immediately
-        requests.get("https://www.example.com")  # noqa: S113
+        requests.get("https://www.example.com", timeout=10.0)

libs/langchain/uv.lock

@@ -15,7 +15,10 @@ resolution-markers = [
 ]
 
 [manifest]
-constraints = [{ name = "urllib3", specifier = ">=2.6.3" }]
+constraints = [
+    { name = "pygments", specifier = ">=2.20.0" },
+    { name = "urllib3", specifier = ">=2.6.3" },
+]
 
 [[package]]
 name = "aiohappyeyeballs"
@@ -28,7 +31,7 @@ wheels = [
 
 [[package]]
 name = "aiohttp"
-version = "3.13.3"
+version = "3.13.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "aiohappyeyeballs" },
@@ -40,110 +43,110 @@ dependencies = [
     { name = "propcache" },
     { name = "yarl" },
 ]
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+sdist = { url = "https://files.pythonhosted.org/packages/45/4a/064321452809dae953c1ed6e017504e72551a26b6f5708a5a80e4bf556ff/aiohttp-3.13.4.tar.gz", hash = "sha256:d97a6d09c66087890c2ab5d49069e1e570583f7ac0314ecf98294c1b6aaebd38", size = 7859748, upload-time = "2026-03-28T17:19:40.6Z" }
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 [[package]]
@@ -2379,7 +2391,7 @@ wheels = [
 
 [[package]]
 name = "langchain-classic"
-version = "1.0.2"
+version = "1.0.3"
 source = { editable = "." }
 dependencies = [
     { name = "async-timeout", marker = "python_full_version < '3.11'" },
@@ -2589,7 +2601,7 @@ typing = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.18"
+version = "1.2.24"
 source = { editable = "../core" }
 dependencies = [
     { name = "jsonpatch" },
@@ -2772,7 +2784,7 @@ wheels = [
 
 [[package]]
 name = "langchain-openai"
-version = "1.1.11"
+version = "1.1.12"
 source = { editable = "../partners/openai" }
 dependencies = [
     { name = "langchain-core" },
@@ -2910,11 +2922,8 @@ test = [
 test-integration = [
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-    { name = "scipy", marker = "python_full_version >= '3.13'", specifier = ">=1.14.1,<2.0.0" },
-    { name = "sentence-transformers", specifier = ">=3.0.1,<6.0.0" },
-    { name = "spacy", marker = "python_full_version < '3.14'", specifier = ">=3.8.7,<4.0.0" },
-    { name = "thinc", specifier = ">=8.3.6,<10.0.0" },
+    { name = "sentence-transformers", specifier = ">=5.3.0,<6.0.0" },
+    { name = "spacy", specifier = ">=3.8.13,<4.0.0" },
     { name = "tiktoken", specifier = ">=0.8.0,<1.0.0" },
     { name = "transformers", specifier = ">=4.51.3,<6.0.0" },
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@@ -3738,83 +3747,83 @@ wheels = [
 
 [[package]]
 name = "orjson"
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 ]
 
 [[package]]
@@ -4977,7 +5016,7 @@ wheels = [
 
 [[package]]
 name = "requests"
-version = "2.32.5"
+version = "2.33.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "certifi" },
@@ -4985,9 +5024,9 @@ dependencies = [
     { name = "idna" },
     { name = "urllib3" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/c9/74/b3ff8e6c8446842c3f5c837e9c3dfcfe2018ea6ecef224c710c85ef728f4/requests-2.32.5.tar.gz", hash = "sha256:dbba0bac56e100853db0ea71b82b4dfd5fe2bf6d3754a8893c3af500cec7d7cf", size = 134517, upload-time = "2025-08-18T20:46:02.573Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/34/64/8860370b167a9721e8956ae116825caff829224fbca0ca6e7bf8ddef8430/requests-2.33.0.tar.gz", hash = "sha256:c7ebc5e8b0f21837386ad0e1c8fe8b829fa5f544d8df3b2253bff14ef29d7652", size = 134232, upload-time = "2026-03-25T15:10:41.586Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/1e/db/4254e3eabe8020b458f1a747140d32277ec7a271daf1d235b70dc0b4e6e3/requests-2.32.5-py3-none-any.whl", hash = "sha256:2462f94637a34fd532264295e186976db0f5d453d1cdd31473c85a6a161affb6", size = 64738, upload-time = "2025-08-18T20:46:00.542Z" },
+    { url = "https://files.pythonhosted.org/packages/56/5d/c814546c2333ceea4ba42262d8c4d55763003e767fa169adc693bd524478/requests-2.33.0-py3-none-any.whl", hash = "sha256:3324635456fa185245e24865e810cecec7b4caf933d7eb133dcde67d48cee69b", size = 65017, upload-time = "2026-03-25T15:10:40.382Z" },
 ]
 
 [[package]]

libs/langchain_v1/Makefile

@@ -15,6 +15,7 @@ stop_services:
 
 # Define a variable for the test file path.
 TEST_FILE ?= tests/unit_tests/
+PYTEST_EXTRA ?=
 
 .EXPORT_ALL_VARIABLES:
 UV_FROZEN = true
@@ -37,13 +38,13 @@ coverage_agents:
 		--cov-report=html:htmlcov \
 
 test:
-	make start_services && LANGGRAPH_TEST_FAST=0 uv run --no-sync --active --group test pytest -n auto --disable-socket --allow-unix-socket $(TEST_FILE) --cov-report term-missing:skip-covered --snapshot-update; \
+	make start_services && LANGGRAPH_TEST_FAST=0 uv run --no-sync --active --group test pytest -n auto $(PYTEST_EXTRA) --disable-socket --allow-unix-socket $(TEST_FILE) --cov-report term-missing:skip-covered --snapshot-update; \
 	EXIT_CODE=$$?; \
 	make stop_services; \
 	exit $$EXIT_CODE
 
 test_fast:
-	LANGGRAPH_TEST_FAST=1 uv run --group test pytest -n auto --disable-socket --allow-unix-socket $(TEST_FILE)
+	LANGGRAPH_TEST_FAST=1 uv run --group test pytest -n auto $(PYTEST_EXTRA) --disable-socket --allow-unix-socket $(TEST_FILE)
 
 extended_tests:
 	make start_services && LANGGRAPH_TEST_FAST=0 uv run --group test pytest --disable-socket --allow-unix-socket --only-extended tests/unit_tests; \
@@ -80,22 +81,25 @@ check_version:
 PYTHON_FILES=.
 MYPY_CACHE=.mypy_cache
 lint format: PYTHON_FILES=.
-lint_diff format_diff: PYTHON_FILES=$(shell git diff --relative=libs/langchain --name-only --diff-filter=d master | grep -E '\.py$$|\.ipynb$$')
+lint_diff format_diff: PYTHON_FILES=$(shell git diff --relative=libs/langchain_v1 --name-only --diff-filter=d master | grep -E '\.py$$|\.ipynb$$')
 lint_package: PYTHON_FILES=langchain
 lint_tests: PYTHON_FILES=tests
 lint_tests: MYPY_CACHE=.mypy_cache_test
+UV_RUN_LINT = uv run --all-groups
+UV_RUN_TYPE = uv run --all-groups
+lint_package lint_tests: UV_RUN_LINT = uv run --group lint
 
 lint lint_diff lint_package lint_tests:
-	[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff check $(PYTHON_FILES)
-	[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff format $(PYTHON_FILES) --diff
-	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE) && uv run --all-groups mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	[ "$(PYTHON_FILES)" = "" ] || $(UV_RUN_LINT) ruff check $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || $(UV_RUN_LINT) ruff format $(PYTHON_FILES) --diff
+	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE) && $(UV_RUN_TYPE) mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
 type:
-	mkdir -p $(MYPY_CACHE) && uv run --all-groups mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	mkdir -p $(MYPY_CACHE) && $(UV_RUN_TYPE) mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
 format format_diff:
-	[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff format $(PYTHON_FILES)
-	[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff check --fix $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || $(UV_RUN_LINT) ruff format $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || $(UV_RUN_LINT) ruff check --fix $(PYTHON_FILES)
 
 ######################
 # HELP

libs/langchain_v1/langchain/__init__.py

@@ -1,3 +1,3 @@
 """Main entrypoint into LangChain."""
 
-__version__ = "1.2.12"
+__version__ = "1.2.15"

libs/langchain_v1/langchain/agents/factory.py

@@ -399,11 +399,25 @@ def _chain_async_model_call_handlers(
     return composed_handler
 
 
-def _resolve_schema(schemas: set[type], schema_name: str, omit_flag: str | None = None) -> type:
+def _resolve_schemas(schemas: set[type]) -> tuple[type, type, type]:
+    """Resolve state, input, and output schemas for the given schemas."""
+    schema_hints = {schema: get_type_hints(schema, include_extras=True) for schema in schemas}
+    return (
+        _resolve_schema(schema_hints, "StateSchema", None),
+        _resolve_schema(schema_hints, "InputSchema", "input"),
+        _resolve_schema(schema_hints, "OutputSchema", "output"),
+    )
+
+
+def _resolve_schema(
+    schema_hints: dict[type, dict[str, Any]],
+    schema_name: str,
+    omit_flag: str | None = None,
+) -> type:
     """Resolve schema by merging schemas and optionally respecting `OmitFromSchema` annotations.
 
     Args:
-        schemas: List of schema types to merge
+        schema_hints: Resolved schema annotations to merge
         schema_name: Name for the generated `TypedDict`
         omit_flag: If specified, omit fields with this flag set (`'input'` or
             `'output'`)
@@ -413,14 +427,11 @@ def _resolve_schema(schemas: set[type], schema_name: str, omit_flag: str | None
     """
     all_annotations = {}
 
-    for schema in schemas:
-        hints = get_type_hints(schema, include_extras=True)
-
+    for hints in schema_hints.values():
         for field_name, field_type in hints.items():
             should_omit = False
 
             if omit_flag:
-                # Check for omission in the annotation metadata
                 metadata = _extract_metadata(field_type)
                 for meta in metadata:
                     if isinstance(meta, OmitFromSchema) and getattr(meta, omit_flag) is True:
@@ -1010,9 +1021,7 @@ def create_agent(
     base_state = state_schema if state_schema is not None else AgentState
     state_schemas.add(base_state)
 
-    resolved_state_schema = _resolve_schema(state_schemas, "StateSchema", None)
-    input_schema = _resolve_schema(state_schemas, "InputSchema", "input")
-    output_schema = _resolve_schema(state_schemas, "OutputSchema", "output")
+    resolved_state_schema, input_schema, output_schema = _resolve_schemas(state_schemas)
 
     # create graph, add nodes
     graph: StateGraph[
@@ -1629,9 +1638,12 @@ def create_agent(
             can_jump_to=_get_can_jump_to(middleware_w_after_agent[0], "after_agent"),
         )
 
-    config: RunnableConfig = {"recursion_limit": 10_000}
+    # Set recursion limit to 9_999
+    # https://github.com/langchain-ai/langgraph/issues/7313
+    config: RunnableConfig = {"recursion_limit": 9_999}
+    config["metadata"] = {"ls_integration": "langchain_create_agent"}
     if name:
-        config["metadata"] = {"lc_agent_name": name}
+        config["metadata"]["lc_agent_name"] = name
 
     return graph.compile(
         checkpointer=checkpointer,

libs/langchain_v1/langchain/agents/middleware/__init__.py

@@ -1,5 +1,7 @@
 """Entrypoint to using [middleware](https://docs.langchain.com/oss/python/langchain/middleware) plugins with [Agents](https://docs.langchain.com/oss/python/langchain/agents)."""  # noqa: E501
 
+from langgraph.runtime import Runtime
+
 from langchain.agents.middleware.context_editing import ClearToolUsesEdit, ContextEditingMiddleware
 from langchain.agents.middleware.file_search import FilesystemFileSearchMiddleware
 from langchain.agents.middleware.human_in_the_loop import (
@@ -64,6 +66,7 @@ __all__ = [
     "PIIDetectionError",
     "PIIMiddleware",
     "RedactionRule",
+    "Runtime",
     "ShellToolMiddleware",
     "SummarizationMiddleware",
     "TodoListMiddleware",

libs/langchain_v1/langchain/agents/middleware/summarization.py

@@ -141,7 +141,7 @@ Example:
 
 def _get_approximate_token_counter(model: BaseChatModel) -> TokenCounter:
     """Tune parameters of approximate token counter based on model type."""
-    if model._llm_type == "anthropic-chat":  # noqa: SLF001
+    if model._llm_type.startswith("anthropic-chat"):  # noqa: SLF001
         # 3.3 was estimated in an offline experiment, comparing with Claude's token-counting
         # API: https://platform.claude.com/docs/en/build-with-claude/token-counting
         return partial(

libs/langchain_v1/langchain/agents/middleware/todo.py

@@ -1,17 +1,13 @@
 """Planning and task management middleware for agents."""
 
-from __future__ import annotations
-
-from typing import TYPE_CHECKING, Annotated, Any, Literal, cast
-
-if TYPE_CHECKING:
-    from collections.abc import Awaitable, Callable
-
-    from langgraph.runtime import Runtime
+from collections.abc import Awaitable, Callable
+from typing import Annotated, Any, Literal, cast
 
 from langchain_core.messages import AIMessage, SystemMessage, ToolMessage
-from langchain_core.tools import tool
+from langchain_core.tools import InjectedToolCallId, StructuredTool, tool
+from langgraph.runtime import Runtime
 from langgraph.types import Command
+from pydantic import BaseModel
 from typing_extensions import NotRequired, TypedDict, override
 
 from langchain.agents.middleware.types import (
@@ -23,7 +19,7 @@ from langchain.agents.middleware.types import (
     OmitFromInput,
     ResponseT,
 )
-from langchain.tools import InjectedToolCallId
+from langchain.tools import ToolRuntime
 
 
 class Todo(TypedDict):
@@ -47,6 +43,12 @@ class PlanningState(AgentState[ResponseT]):
     """List of todo items for tracking task progress."""
 
 
+class WriteTodosInput(BaseModel):
+    """Input schema for the `write_todos` tool."""
+
+    todos: list[Todo]
+
+
 WRITE_TODOS_TOOL_DESCRIPTION = """Use this tool to create and manage a structured task list for your current work session. This helps you track progress, organize complex tasks, and demonstrate thoroughness to the user.
 
 Only use this tool if you think it will be helpful in staying organized. If the user's request is trivial and takes less than 3 steps, it is better to NOT use this tool and just do the task directly.
@@ -135,6 +137,28 @@ def write_todos(
     )
 
 
+# Dynamically create the write_todos tool with the custom description
+def _write_todos(
+    runtime: ToolRuntime[ContextT, PlanningState[ResponseT]], todos: list[Todo]
+) -> Command[Any]:
+    """Create and manage a structured task list for your current work session."""
+    return Command(
+        update={
+            "todos": todos,
+            "messages": [
+                ToolMessage(f"Updated todo list to {todos}", tool_call_id=runtime.tool_call_id)
+            ],
+        }
+    )
+
+
+async def _awrite_todos(
+    runtime: ToolRuntime[ContextT, PlanningState[ResponseT]], todos: list[Todo]
+) -> Command[Any]:
+    """Create and manage a structured task list for your current work session."""
+    return _write_todos(runtime, todos)
+
+
 class TodoListMiddleware(AgentMiddleware[PlanningState[ResponseT], ContextT, ResponseT]):
     """Middleware that provides todo list management capabilities to agents.
 
@@ -181,22 +205,16 @@ class TodoListMiddleware(AgentMiddleware[PlanningState[ResponseT], ContextT, Res
         self.system_prompt = system_prompt
         self.tool_description = tool_description
 
-        # Dynamically create the write_todos tool with the custom description
-        @tool(description=self.tool_description)
-        def write_todos(
-            todos: list[Todo], tool_call_id: Annotated[str, InjectedToolCallId]
-        ) -> Command[Any]:
-            """Create and manage a structured task list for your current work session."""
-            return Command(
-                update={
-                    "todos": todos,
-                    "messages": [
-                        ToolMessage(f"Updated todo list to {todos}", tool_call_id=tool_call_id)
-                    ],
-                }
+        self.tools = [
+            StructuredTool.from_function(
+                name="write_todos",
+                description=tool_description,
+                func=_write_todos,
+                coroutine=_awrite_todos,
+                args_schema=WriteTodosInput,
+                infer_schema=False,
             )
-
-        self.tools = [write_todos]
+        ]
 
     def wrap_model_call(
         self,

libs/langchain_v1/langchain/chat_models/base.py

@@ -38,7 +38,7 @@ def _call(cls: type[BaseChatModel], **kwargs: Any) -> BaseChatModel:
 _BUILTIN_PROVIDERS: dict[str, tuple[str, str, Callable[..., BaseChatModel]]] = {
     "anthropic": ("langchain_anthropic", "ChatAnthropic", _call),
     "anthropic_bedrock": ("langchain_aws", "ChatAnthropicBedrock", _call),
-    "azure_ai": ("langchain_azure_ai.chat_models", "AzureAIChatCompletionsModel", _call),
+    "azure_ai": ("langchain_azure_ai.chat_models", "AzureAIOpenAIApiChatModel", _call),
     "azure_openai": ("langchain_openai", "AzureChatOpenAI", _call),
     "baseten": ("langchain_baseten", "ChatBaseten", _call),
     "bedrock": ("langchain_aws", "ChatBedrock", _call),
@@ -285,6 +285,8 @@ def init_chat_model(
             - `openrouter`              -> [`langchain-openrouter`](https://docs.langchain.com/oss/python/integrations/providers/openrouter)
             - `perplexity`              -> [`langchain-perplexity`](https://docs.langchain.com/oss/python/integrations/providers/perplexity)
             - `upstage`                 -> [`langchain-upstage`](https://docs.langchain.com/oss/python/integrations/providers/upstage)
+            - `baseten`                 -> [`langchain-baseten`](https://docs.langchain.com/oss/python/integrations/providers/baseten)
+            - `litellm`                 -> [`langchain-litellm`](https://docs.langchain.com/oss/python/integrations/providers/litellm)
 
         configurable_fields: Which model parameters are configurable at runtime:
 

libs/langchain_v1/langchain/embeddings/base.py

@@ -13,6 +13,7 @@ def _call(cls: type[Embeddings], **kwargs: Any) -> Embeddings:
 
 
 _BUILTIN_PROVIDERS: dict[str, tuple[str, str, Callable[..., Embeddings]]] = {
+    "azure_ai": ("langchain_azure_ai.embeddings", "AzureAIOpenAIApiEmbeddingsModel", _call),
     "azure_openai": ("langchain_openai", "AzureOpenAIEmbeddings", _call),
     "bedrock": (
         "langchain_aws",
@@ -84,7 +85,7 @@ def _get_embeddings_class_creator(provider: str) -> Callable[..., Embeddings]:
     try:
         module = importlib.import_module(module_name)
     except ImportError as e:
-        pkg = module_name.replace("_", "-")
+        pkg = module_name.split(".", maxsplit=1)[0].replace("_", "-")
         msg = f"Could not import {pkg} python package. Please install it with `pip install {pkg}`"
         raise ImportError(msg) from e
 
@@ -217,6 +218,7 @@ def init_embeddings(
             are:
 
             - `openai`                  -> [`langchain-openai`](https://docs.langchain.com/oss/python/integrations/providers/openai)
+            - `azure_ai`                -> [`langchain-azure-ai`](https://docs.langchain.com/oss/python/integrations/providers/microsoft)
             - `azure_openai`            -> [`langchain-openai`](https://docs.langchain.com/oss/python/integrations/providers/openai)
             - `bedrock`                 -> [`langchain-aws`](https://docs.langchain.com/oss/python/integrations/providers/aws)
             - `cohere`                  -> [`langchain-cohere`](https://docs.langchain.com/oss/python/integrations/providers/cohere)

libs/langchain_v1/pyproject.toml

@@ -21,11 +21,11 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 
-version = "1.2.12"
+version = "1.2.15"
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
     "langchain-core>=1.2.10,<2.0.0",
-    "langgraph>=1.1.1,<1.2.0",
+    "langgraph>=1.1.5,<1.2.0",
     "pydantic>=2.7.4,<3.0.0",
 ]
 
@@ -44,6 +44,7 @@ mistralai = ["langchain-mistralai"]
 huggingface = ["langchain-huggingface"]
 groq = ["langchain-groq"]
 aws = ["langchain-aws"]
+baseten = ["langchain-baseten>=0.2.0"]
 deepseek = ["langchain-deepseek"]
 xai = ["langchain-xai"]
 perplexity = ["langchain-perplexity"]
@@ -92,7 +93,7 @@ test_integration = [
 
 [tool.uv]
 prerelease = "allow"
-constraint-dependencies = ["urllib3>=2.6.3"]
+constraint-dependencies = ["urllib3>=2.6.3", "pygments>=2.20.0"]
 
 [tool.uv.sources]
 langchain-core = { path = "../core", editable = true }