model settings in create agent

getting around deprecated azure model issues blocking core release

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -8,16 +8,15 @@ body:
       value: |
         Thank you for taking the time to file a bug report.
 
-        Use this to report BUGS in LangChain. For usage questions, feature requests and general design questions, please use the [LangChain Forum](https://forum.langchain.com/).
+        For usage questions, feature requests and general design questions, please use the [LangChain Forum](https://forum.langchain.com/).
 
-        Relevant links to check before filing a bug report to see if your issue has already been reported, fixed or
-        if there's another way to solve your problem:
+        Check these before submitting to see if your issue has already been reported, fixed or if there's another way to solve your problem:
 
-        * [LangChain Forum](https://forum.langchain.com/),
-        * [LangChain documentation with the integrated search](https://docs.langchain.com/oss/python/langchain/overview),
-        * [API Reference](https://reference.langchain.com/python/),
+        * [Documentation](https://docs.langchain.com/oss/python/langchain/overview),
+        * [API Reference Documentation](https://reference.langchain.com/python/),
         * [LangChain ChatBot](https://chat.langchain.com/)
         * [GitHub search](https://github.com/langchain-ai/langchain),
+        * [LangChain Forum](https://forum.langchain.com/),
   - type: checkboxes
     id: checks
     attributes:
@@ -36,16 +35,48 @@ body:
           required: true
         - label: This is not related to the langchain-community package.
           required: true
-        - label: I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example).
-          required: true
         - label: I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.
           required: true
+  - type: checkboxes
+    id: package
+    attributes:
+      label: Package (Required)
+      description: |
+        Which `langchain` package(s) is this bug related to? Select at least one.
+
+        Note that if the package you are reporting for is not listed here, it is not in this repository (e.g. `langchain-google-genai` is in [`langchain-ai/langchain-google`](https://github.com/langchain-ai/langchain-google/)).
+
+        Please report issues for other packages to their respective repositories.
+      options:
+        - label: langchain
+        - label: langchain-openai
+        - label: langchain-anthropic
+        - label: langchain-classic
+        - label: langchain-core
+        - label: langchain-cli
+        - label: langchain-model-profiles
+        - label: langchain-tests
+        - label: langchain-text-splitters
+        - label: langchain-chroma
+        - label: langchain-deepseek
+        - label: langchain-exa
+        - label: langchain-fireworks
+        - label: langchain-groq
+        - label: langchain-huggingface
+        - label: langchain-mistralai
+        - label: langchain-nomic
+        - label: langchain-ollama
+        - label: langchain-perplexity
+        - label: langchain-prompty
+        - label: langchain-qdrant
+        - label: langchain-xai
+        - label: Other / not sure / general
   - type: textarea
     id: reproduction
     validations:
       required: true
     attributes:
-      label: Example Code
+      label: Example Code (Python)
       description: |
         Please add a self-contained, [minimal, reproducible, example](https://stackoverflow.com/help/minimal-reproducible-example) with your use case.
 
@@ -53,15 +84,12 @@ body:
 
         **Important!**
 
-        * Avoid screenshots when possible, as they are hard to read and (more importantly) don't allow others to copy-and-paste your code.
-        * Reduce your code to the minimum required to reproduce the issue if possible. This makes it much easier for others to help you.
-        * Use code tags (e.g., ```python ... ```) to correctly [format your code](https://help.github.com/en/github/writing-on-github/creating-and-highlighting-code-blocks#syntax-highlighting).
-        * INCLUDE the language label (e.g. `python`) after the first three backticks to enable syntax highlighting. (e.g., ```python rather than ```).
+        * Avoid screenshots, as they are hard to read and (more importantly) don't allow others to copy-and-paste your code.
+        * Reduce your code to the minimum required to reproduce the issue if possible.
 
+        (This will be automatically formatted into code, so no need for backticks.)
+      render: python
       placeholder: |
-        The following code:
-
-        ```python
         from langchain_core.runnables import RunnableLambda
 
         def bad_code(inputs) -> int:
@@ -69,17 +97,14 @@ body:
 
           chain = RunnableLambda(bad_code)
           chain.invoke('Hello!')
-        ```
   - type: textarea
-    id: error
-    validations:
-      required: false
     attributes:
       label: Error Message and Stack Trace (if applicable)
       description: |
-        If you are reporting an error, please include the full error message and stack trace.
-      placeholder: |
-        Exception + full stack trace
+        If you are reporting an error, please copy and paste the full error message and
+        stack trace.
+        (This will be automatically formatted into code, so no need for backticks.)
+      render: shell
   - type: textarea
     id: description
     attributes:
@@ -99,9 +124,7 @@ body:
     attributes:
       label: System Info
       description: |
-        Please share your system info with us. Do NOT skip this step and please don't trim
-        the output. Most users don't include enough information here and it makes it harder
-        for us to help you.
+        Please share your system info with us.
 
         Run the following command in your terminal and paste the output here:
 
@@ -113,8 +136,6 @@ body:
         from langchain_core import sys_info
         sys_info.print_sys_info()
         ```
-
-        alternatively, put the entire output of `pip freeze` here.
       placeholder: |
         python -m langchain_core.sys_info
     validations:

.github/ISSUE_TEMPLATE/config.yml

@@ -1,9 +1,18 @@
 blank_issues_enabled: false
 version: 2.1
 contact_links:
-  - name: 📚 Documentation
-    url: https://github.com/langchain-ai/docs/issues/new?template=langchain.yml
+  - name: 📚 Documentation issue
+    url: https://github.com/langchain-ai/docs/issues/new?template=01-langchain.yml
     about: Report an issue related to the LangChain documentation
   - name: 💬 LangChain Forum
     url:  https://forum.langchain.com/
     about: General community discussions and support
+  - name: 📚 LangChain Documentation
+    url: https://docs.langchain.com/oss/python/langchain/overview
+    about: View the official LangChain documentation
+  - name: 📚 API Reference Documentation
+    url: https://reference.langchain.com/python/
+    about: View the official LangChain API reference documentation
+  - name: 💬 LangChain Forum
+    url: https://forum.langchain.com/
+    about: Ask questions and get help from the community

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -13,11 +13,11 @@ body:
         Relevant links to check before filing a feature request to see if your request has already been made or
         if there's another way to achieve what you want:
 
-        * [LangChain Forum](https://forum.langchain.com/),
-        * [LangChain documentation with the integrated search](https://docs.langchain.com/oss/python/langchain/overview),
-        * [API Reference](https://reference.langchain.com/python/),
+        * [Documentation](https://docs.langchain.com/oss/python/langchain/overview),
+        * [API Reference Documentation](https://reference.langchain.com/python/),
         * [LangChain ChatBot](https://chat.langchain.com/)
         * [GitHub search](https://github.com/langchain-ai/langchain),
+        * [LangChain Forum](https://forum.langchain.com/),
   - type: checkboxes
     id: checks
     attributes:
@@ -34,6 +34,40 @@ body:
           required: true
         - label: This is not related to the langchain-community package.
           required: true
+  - type: checkboxes
+    id: package
+    attributes:
+      label: Package (Required)
+      description: |
+        Which `langchain` package(s) is this request related to? Select at least one.
+
+        Note that if the package you are requesting for is not listed here, it is not in this repository (e.g. `langchain-google-genai` is in `langchain-ai/langchain`).
+
+        Please submit feature requests for other packages to their respective repositories.
+      options:
+        - label: langchain
+        - label: langchain-openai
+        - label: langchain-anthropic
+        - label: langchain-classic
+        - label: langchain-core
+        - label: langchain-cli
+        - label: langchain-model-profiles
+        - label: langchain-tests
+        - label: langchain-text-splitters
+        - label: langchain-chroma
+        - label: langchain-deepseek
+        - label: langchain-exa
+        - label: langchain-fireworks
+        - label: langchain-groq
+        - label: langchain-huggingface
+        - label: langchain-mistralai
+        - label: langchain-nomic
+        - label: langchain-ollama
+        - label: langchain-perplexity
+        - label: langchain-prompty
+        - label: langchain-qdrant
+        - label: langchain-xai
+        - label: Other / not sure / general
   - type: textarea
     id: feature-description
     validations:

.github/ISSUE_TEMPLATE/privileged.yml

@@ -18,3 +18,33 @@ body:
     attributes:
       label: Issue Content
       description: Add the content of the issue here.
+  - type: checkboxes
+    id: package
+    attributes:
+      label: Package (Required)
+      description: |
+        Please select package(s) that this issue is related to.
+      options:
+        - label: langchain
+        - label: langchain-openai
+        - label: langchain-anthropic
+        - label: langchain-classic
+        - label: langchain-core
+        - label: langchain-cli
+        - label: langchain-model-profiles
+        - label: langchain-tests
+        - label: langchain-text-splitters
+        - label: langchain-chroma
+        - label: langchain-deepseek
+        - label: langchain-exa
+        - label: langchain-fireworks
+        - label: langchain-groq
+        - label: langchain-huggingface
+        - label: langchain-mistralai
+        - label: langchain-nomic
+        - label: langchain-ollama
+        - label: langchain-perplexity
+        - label: langchain-prompty
+        - label: langchain-qdrant
+        - label: langchain-xai
+        - label: Other / not sure / general

.github/ISSUE_TEMPLATE/task.yml

@@ -25,13 +25,13 @@ body:
       label: Task Description
       description: |
         Provide a clear and detailed description of the task.
-        
+
         What needs to be done? Be specific about the scope and requirements.
       placeholder: |
         This task involves...
-        
+
         The goal is to...
-        
+
         Specific requirements:
         - ...
         - ...
@@ -43,7 +43,7 @@ body:
       label: Acceptance Criteria
       description: |
         Define the criteria that must be met for this task to be considered complete.
-        
+
         What are the specific deliverables or outcomes expected?
       placeholder: |
         This task will be complete when:
@@ -58,15 +58,15 @@ body:
       label: Context and Background
       description: |
         Provide any relevant context, background information, or links to related issues/PRs.
-        
+
         Why is this task needed? What problem does it solve?
       placeholder: |
         Background:
         - ...
-        
+
         Related issues/PRs:
         - #...
-        
+
         Additional context:
         - ...
     validations:
@@ -77,15 +77,45 @@ body:
       label: Dependencies
       description: |
         List any dependencies or blockers for this task.
-        
+
         Are there other tasks, issues, or external factors that need to be completed first?
       placeholder: |
         This task depends on:
         - [ ] Issue #...
         - [ ] PR #...
         - [ ] External dependency: ...
-        
+
         Blocked by:
         - ...
     validations:
       required: false
+  - type: checkboxes
+    id: package
+    attributes:
+      label: Package (Required)
+      description: |
+        Please select package(s) that this task is related to.
+      options:
+        - label: langchain
+        - label: langchain-openai
+        - label: langchain-anthropic
+        - label: langchain-classic
+        - label: langchain-core
+        - label: langchain-cli
+        - label: langchain-model-profiles
+        - label: langchain-tests
+        - label: langchain-text-splitters
+        - label: langchain-chroma
+        - label: langchain-deepseek
+        - label: langchain-exa
+        - label: langchain-fireworks
+        - label: langchain-groq
+        - label: langchain-huggingface
+        - label: langchain-mistralai
+        - label: langchain-nomic
+        - label: langchain-ollama
+        - label: langchain-perplexity
+        - label: langchain-prompty
+        - label: langchain-qdrant
+        - label: langchain-xai
+        - label: Other / not sure / general

.github/actions/poetry_setup/action.yml

@@ -1,93 +0,0 @@
-# An action for setting up poetry install with caching.
-# Using a custom action since the default action does not
-# take poetry install groups into account.
-# Action code from:
-# https://github.com/actions/setup-python/issues/505#issuecomment-1273013236
-name: poetry-install-with-caching
-description: Poetry install with support for caching of dependency groups.
-
-inputs:
-  python-version:
-    description: Python version, supporting MAJOR.MINOR only
-    required: true
-
-  poetry-version:
-    description: Poetry version
-    required: true
-
-  cache-key:
-    description: Cache key to use for manual handling of caching
-    required: true
-
-  working-directory:
-    description: Directory whose poetry.lock file should be cached
-    required: true
-
-runs:
-  using: composite
-  steps:
-    - uses: actions/setup-python@v5
-      name: Setup python ${{ inputs.python-version }}
-      id: setup-python
-      with:
-        python-version: ${{ inputs.python-version }}
-
-    - uses: actions/cache@v4
-      id: cache-bin-poetry
-      name: Cache Poetry binary - Python ${{ inputs.python-version }}
-      env:
-        SEGMENT_DOWNLOAD_TIMEOUT_MIN: "1"
-      with:
-        path: |
-          /opt/pipx/venvs/poetry
-        # This step caches the poetry installation, so make sure it's keyed on the poetry version as well.
-        key: bin-poetry-${{ runner.os }}-${{ runner.arch }}-py-${{ inputs.python-version }}-${{ inputs.poetry-version }}
-
-    - name: Refresh shell hashtable and fixup softlinks
-      if: steps.cache-bin-poetry.outputs.cache-hit == 'true'
-      shell: bash
-      env:
-        POETRY_VERSION: ${{ inputs.poetry-version }}
-        PYTHON_VERSION: ${{ inputs.python-version }}
-      run: |
-        set -eux
-
-        # Refresh the shell hashtable, to ensure correct `which` output.
-        hash -r
-
-        # `actions/cache@v3` doesn't always seem able to correctly unpack softlinks.
-        # Delete and recreate the softlinks pipx expects to have.
-        rm /opt/pipx/venvs/poetry/bin/python
-        cd /opt/pipx/venvs/poetry/bin
-        ln -s "$(which "python$PYTHON_VERSION")" python
-        chmod +x python
-        cd /opt/pipx_bin/
-        ln -s /opt/pipx/venvs/poetry/bin/poetry poetry
-        chmod +x poetry
-
-        # Ensure everything got set up correctly.
-        /opt/pipx/venvs/poetry/bin/python --version
-        /opt/pipx_bin/poetry --version
-
-    - name: Install poetry
-      if: steps.cache-bin-poetry.outputs.cache-hit != 'true'
-      shell: bash
-      env:
-        POETRY_VERSION: ${{ inputs.poetry-version }}
-        PYTHON_VERSION: ${{ inputs.python-version }}
-      # Install poetry using the python version installed by setup-python step.
-      run: pipx install "poetry==$POETRY_VERSION" --python '${{ steps.setup-python.outputs.python-path }}' --verbose
-
-    - name: Restore pip and poetry cached dependencies
-      uses: actions/cache@v4
-      env:
-        SEGMENT_DOWNLOAD_TIMEOUT_MIN: "4"
-        WORKDIR: ${{ inputs.working-directory == '' && '.' || inputs.working-directory }}
-      with:
-        path: |
-          ~/.cache/pip
-          ~/.cache/pypoetry/virtualenvs
-          ~/.cache/pypoetry/cache
-          ~/.cache/pypoetry/artifacts
-          ${{ env.WORKDIR }}/.venv
-        key: py-deps-${{ runner.os }}-${{ runner.arch }}-py-${{ inputs.python-version }}-poetry-${{ inputs.poetry-version }}-${{ inputs.cache-key }}-${{ hashFiles(format('{0}/**/poetry.lock', env.WORKDIR)) }}

.github/pr-file-labeler.yml

@@ -7,13 +7,12 @@ core:
       - any-glob-to-any-file:
           - "libs/core/**/*"
 
-langchain:
+langchain-classic:
   - changed-files:
       - any-glob-to-any-file:
           - "libs/langchain/**/*"
-          - "libs/langchain_v1/**/*"
 
-v1:
+langchain:
   - changed-files:
       - any-glob-to-any-file:
           - "libs/langchain_v1/**/*"
@@ -28,6 +27,11 @@ standard-tests:
       - 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:
@@ -39,6 +43,81 @@ integration:
       - 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/**/*"
+
+perplexity:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/partners/perplexity/**/*"
+
+prompty:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/partners/prompty/**/*"
+
+qdrant:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/partners/qdrant/**/*"
+
+xai:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/partners/xai/**/*"
+
 # Infrastructure and DevOps
 infra:
   - changed-files:

.github/pr-title-labeler.yml

@@ -1,41 +0,0 @@
-# PR title labeler config
-#
-# Labels PRs based on conventional commit patterns in titles
-#
-# Format: type(scope): description or type!: description (breaking)
-
-add-missing-labels: true
-clear-prexisting: false
-include-commits: false
-include-title: true
-label-for-breaking-changes: breaking
-
-label-mapping:
-  documentation: ["docs"]
-  feature: ["feat"]
-  fix: ["fix"]
-  infra: ["build", "ci", "chore"]
-  integration:
-    [
-      "anthropic",
-      "chroma",
-      "deepseek",
-      "exa",
-      "fireworks",
-      "groq",
-      "huggingface",
-      "mistralai",
-      "nomic",
-      "ollama",
-      "openai",
-      "perplexity",
-      "prompty",
-      "qdrant",
-      "xai",
-    ]
-  linting: ["style"]
-  performance: ["perf"]
-  refactor: ["refactor"]
-  release: ["release"]
-  revert: ["revert"]
-  tests: ["test"]

.github/scripts/check_diff.py

@@ -30,6 +30,7 @@ LANGCHAIN_DIRS = [
     "libs/text-splitters",
     "libs/langchain",
     "libs/langchain_v1",
+    "libs/model-profiles",
 ]
 
 # When set to True, we are ignoring core dependents
@@ -130,21 +131,12 @@ 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 = ["3.12"]  # 3.13 is not yet supported
+        py_versions = ["3.13"]
     elif dir_ == "libs/core":
         py_versions = ["3.10", "3.11", "3.12", "3.13", "3.14"]
     # custom logic for specific directories
-
-    elif dir_ == "libs/langchain" and job == "extended-tests":
-        py_versions = ["3.10", "3.14"]
-    elif dir_ == "libs/langchain_v1":
+    elif dir_ in {"libs/partners/chroma"}:
         py_versions = ["3.10", "3.13"]
-    elif dir_ in {"libs/cli", "libs/partners/chroma", "libs/partners/nomic"}:
-        py_versions = ["3.10", "3.13"]
-
-    elif dir_ == ".":
-        # unable to install with 3.13 because tokenizers doesn't support 3.13 yet
-        py_versions = ["3.10", "3.12"]
     else:
         py_versions = ["3.10", "3.14"]
 
@@ -152,7 +144,7 @@ def _get_configs_for_single_dir(job: str, dir_: str) -> List[Dict[str, str]]:
 
 
 def _get_pydantic_test_configs(
-    dir_: str, *, python_version: str = "3.11"
+    dir_: str, *, python_version: str = "3.12"
 ) -> List[Dict[str, str]]:
     with open("./libs/core/uv.lock", "rb") as f:
         core_uv_lock_data = tomllib.load(f)
@@ -306,7 +298,9 @@ if __name__ == "__main__":
                 if not filename.startswith(".")
             ] != ["README.md"]:
                 dirs_to_run["test"].add(f"libs/partners/{partner_dir}")
-                dirs_to_run["codspeed"].add(f"libs/partners/{partner_dir}")
+                # Skip codspeed for partners without benchmarks or in IGNORED_PARTNERS
+                if partner_dir not in IGNORED_PARTNERS:
+                    dirs_to_run["codspeed"].add(f"libs/partners/{partner_dir}")
             # Skip if the directory was deleted or is just a tombstone readme
         elif file.startswith("libs/"):
             # Check if this is a root-level file in libs/ (e.g., libs/README.md)

.github/scripts/get_min_versions.py

@@ -98,7 +98,7 @@ def _check_python_version_from_requirement(
         return True
     else:
         marker_str = str(requirement.marker)
-        if "python_version" or "python_full_version" in marker_str:
+        if "python_version" in marker_str or "python_full_version" in marker_str:
             python_version_str = "".join(
                 char
                 for char in marker_str

.github/workflows/_release.yml

@@ -77,7 +77,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
       - name: Upload build
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -149,8 +149,8 @@ jobs:
             fi
           fi
 
-          # if PREV_TAG is empty, let it be empty
-          if [ -z "$PREV_TAG" ]; then
+          # if PREV_TAG is empty or came out to 0.0.0, let it be empty
+          if [ -z "$PREV_TAG" ] || [ "$PREV_TAG" = "$PKG_NAME==0.0.0" ]; then
             echo "No previous tag found - first release"
           else
             # confirm prev-tag actually exists in git repo with git tag
@@ -179,8 +179,8 @@ jobs:
           PREV_TAG: ${{ steps.check-tags.outputs.prev-tag }}
         run: |
           PREAMBLE="Changes since $PREV_TAG"
-          # if PREV_TAG is empty, then we are releasing the first version
-          if [ -z "$PREV_TAG" ]; then
+          # if PREV_TAG is empty or 0.0.0, then we are releasing the first version
+          if [ -z "$PREV_TAG" ] || [ "$PREV_TAG" = "$PKG_NAME==0.0.0" ]; then
             PREAMBLE="Initial release"
             PREV_TAG=$(git rev-list --max-parents=0 HEAD)
           fi
@@ -208,7 +208,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -258,7 +258,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -377,6 +377,7 @@ jobs:
           XAI_API_KEY: ${{ secrets.XAI_API_KEY }}
           DEEPSEEK_API_KEY: ${{ secrets.DEEPSEEK_API_KEY }}
           PPLX_API_KEY: ${{ secrets.PPLX_API_KEY }}
+          LANGCHAIN_TESTS_USER_AGENT: ${{ secrets.LANGCHAIN_TESTS_USER_AGENT }}
         run: make integration_tests
         working-directory: ${{ inputs.working-directory }}
 
@@ -395,7 +396,7 @@ jobs:
       contents: read
     strategy:
       matrix:
-        partner: [openai, anthropic]
+        partner: [anthropic]
       fail-fast: false # Continue testing other partners if one fails
     env:
       ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
@@ -409,6 +410,7 @@ jobs:
       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 }}
+      LANGCHAIN_TESTS_USER_AGENT: ${{ secrets.LANGCHAIN_TESTS_USER_AGENT }}
     steps:
       - uses: actions/checkout@v5
 
@@ -428,7 +430,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         if: startsWith(inputs.working-directory, 'libs/core')
         with:
           name: dist
@@ -442,7 +444,7 @@ jobs:
             git ls-remote --tags origin "langchain-${{ matrix.partner }}*" \
             | awk '{print $2}' \
             | sed 's|refs/tags/||' \
-            | grep -E '[0-9]+\.[0-9]+\.[0-9]+([a-zA-Z]+[0-9]+)?$' \
+            | grep -E '[0-9]+\.[0-9]+\.[0-9]+$' \
             | sort -Vr \
             | head -n 1
           )"
@@ -497,7 +499,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -537,7 +539,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/

.github/workflows/_test_pydantic.yml

@@ -13,7 +13,7 @@ on:
         required: false
         type: string
         description: "Python version to use"
-        default: "3.11"
+        default: "3.12"
       pydantic-version:
         required: true
         type: string
@@ -51,7 +51,9 @@ jobs:
 
       - name: "🔄 Install Specific Pydantic Version"
         shell: bash
-        run: VIRTUAL_ENV=.venv uv pip install pydantic~=${{ inputs.pydantic-version }}
+        env:
+          PYDANTIC_VERSION: ${{ inputs.pydantic-version }}
+        run: VIRTUAL_ENV=.venv uv pip install "pydantic~=$PYDANTIC_VERSION"
 
       - name: "🧪 Run Core Tests"
         shell: bash

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

@@ -0,0 +1,107 @@
+name: Auto Label Issues by Package
+
+on:
+  issues:
+    types: [opened, edited]
+
+jobs:
+  label-by-package:
+    permissions:
+      issues: write
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Sync package labels
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const body = context.payload.issue.body || "";
+
+            // Extract text under "### Package"
+            const match = body.match(/### Package\s+([\s\S]*?)\n###/i);
+            if (!match) return;
+
+            const packageSection = match[1].trim();
+
+            // Mapping table for package names to labels
+            const mapping = {
+              "langchain": "langchain",
+              "langchain-openai": "openai",
+              "langchain-anthropic": "anthropic",
+              "langchain-classic": "langchain-classic",
+              "langchain-core": "core",
+              "langchain-cli": "cli",
+              "langchain-model-profiles": "model-profiles",
+              "langchain-tests": "standard-tests",
+              "langchain-text-splitters": "text-splitters",
+              "langchain-chroma": "chroma",
+              "langchain-deepseek": "deepseek",
+              "langchain-exa": "exa",
+              "langchain-fireworks": "fireworks",
+              "langchain-groq": "groq",
+              "langchain-huggingface": "huggingface",
+              "langchain-mistralai": "mistralai",
+              "langchain-nomic": "nomic",
+              "langchain-ollama": "ollama",
+              "langchain-perplexity": "perplexity",
+              "langchain-prompty": "prompty",
+              "langchain-qdrant": "qdrant",
+              "langchain-xai": "xai",
+            };
+
+            // All possible package labels we manage
+            const allPackageLabels = Object.values(mapping);
+            const selectedLabels = [];
+
+            // Check if this is checkbox format (multiple selection)
+            const checkboxMatches = packageSection.match(/- \[x\]\s+([^\n\r]+)/gi);
+            if (checkboxMatches) {
+              // Handle checkbox format
+              for (const match of checkboxMatches) {
+                const packageName = match.replace(/- \[x\]\s+/i, '').trim();
+                const label = mapping[packageName];
+                if (label && !selectedLabels.includes(label)) {
+                  selectedLabels.push(label);
+                }
+              }
+            } else {
+              // Handle dropdown format (single selection)
+              const label = mapping[packageSection];
+              if (label) {
+                selectedLabels.push(label);
+              }
+            }
+
+            // Get current issue labels
+            const issue = await github.rest.issues.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number
+            });
+
+            const currentLabels = issue.data.labels.map(label => label.name);
+            const currentPackageLabels = currentLabels.filter(label => allPackageLabels.includes(label));
+
+            // Determine labels to add and remove
+            const labelsToAdd = selectedLabels.filter(label => !currentPackageLabels.includes(label));
+            const labelsToRemove = currentPackageLabels.filter(label => !selectedLabels.includes(label));
+
+            // Add new labels
+            if (labelsToAdd.length > 0) {
+              await github.rest.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                labels: labelsToAdd
+              });
+            }
+
+            // Remove old labels
+            for (const label of labelsToRemove) {
+              await github.rest.issues.removeLabel({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                name: label
+              });
+            }

.github/workflows/check_diffs.yml

@@ -184,15 +184,14 @@ jobs:
     steps:
       - uses: actions/checkout@v5
 
-      # We have to use 3.12 as 3.13 is not yet supported
       - name: "📦 Install UV Package Manager"
         uses: astral-sh/setup-uv@v7
         with:
-          python-version: "3.12"
+          python-version: "3.13"
 
       - uses: actions/setup-python@v6
         with:
-          python-version: "3.12"
+          python-version: "3.13"
 
       - name: "📦 Install Test Dependencies"
         run: uv sync --group test

.github/workflows/integration_tests.yml

@@ -155,6 +155,7 @@ jobs:
           WATSONX_APIKEY: ${{ secrets.WATSONX_APIKEY }}
           WATSONX_PROJECT_ID: ${{ secrets.WATSONX_PROJECT_ID }}
           XAI_API_KEY: ${{ secrets.XAI_API_KEY }}
+          LANGCHAIN_TESTS_USER_AGENT: ${{ secrets.LANGCHAIN_TESTS_USER_AGENT }}
         run: |
           cd langchain/${{ matrix.working-directory }}
           make integration_tests

.github/workflows/pr_lint.yml

@@ -26,11 +26,13 @@
 #   * revert     — reverts a previous commit
 #   * release    — prepare a new release
 #
-# Allowed Scopes (optional):
-#   core, cli, langchain, langchain_v1, langchain_legacy, standard-tests,
+# Allowed Scope(s) (optional):
+#   core, cli, langchain, langchain_v1, langchain-classic, standard-tests,
 #   text-splitters, docs, anthropic, chroma, deepseek, exa, fireworks, groq,
 #   huggingface, mistralai, nomic, ollama, openai, perplexity, prompty, qdrant,
-#   xai, infra
+#   xai, infra, deps
+#
+# Multiple scopes can be used by separating them with a comma.
 #
 # Rules:
 #   1. The 'Type' must start with a lowercase letter.
@@ -79,8 +81,8 @@ jobs:
             core
             cli
             langchain
-            langchain_v1
-            langchain_legacy
+            langchain-classic
+            model-profiles
             standard-tests
             text-splitters
             docs

.gitignore

@@ -1,6 +1,8 @@
 .vs/
 .claude/
 .idea/
+#Emacs backup
+*~
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]

.mcp.json

@@ -0,0 +1,8 @@
+{
+  "mcpServers": {
+    "docs-langchain": {
+      "type": "http",
+      "url": "https://docs.langchain.com/mcp"
+    }
+  }
+}

README.md

@@ -1,50 +1,43 @@
-<p align="center">
-  <picture>
-    <source media="(prefers-color-scheme: light)" srcset=".github/images/logo-dark.svg">
-    <source media="(prefers-color-scheme: dark)" srcset=".github/images/logo-light.svg">
-    <img alt="LangChain Logo" src=".github/images/logo-dark.svg" width="80%">
-  </picture>
-</p>
+<div align="center">
+  <a href="https://www.langchain.com/">
+    <picture>
+      <source media="(prefers-color-scheme: light)" srcset=".github/images/logo-dark.svg">
+      <source media="(prefers-color-scheme: dark)" srcset=".github/images/logo-light.svg">
+      <img alt="LangChain Logo" src=".github/images/logo-dark.svg" width="80%">
+    </picture>
+  </a>
+</div>
 
-<p align="center">
-    The platform for reliable agents.
-</p>
+<div align="center">
+  <h3>The platform for reliable agents.</h3>
+</div>
 
-<p align="center">
-  <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://twitter.com/langchainai" target="_blank">
-      <img src="https://img.shields.io/twitter/url/https/twitter.com/langchainai.svg?style=social&label=Follow%20%40LangChainAI" alt="Twitter / X">
-  </a>
-</p>
+<div align="center">
+  <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://twitter.com/langchainai" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchainai.svg?style=social&label=Follow%20%40LangChainAI" alt="Twitter / X"></a>
+</div>
 
-LangChain is a framework for building 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.
+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.
 
 ```bash
 pip install langchain
 ```
 
+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.
+
 ---
 
-**Documentation**: To learn more about LangChain, check out [the docs](https://docs.langchain.com/oss/python/langchain/overview).
+**Documentation**:
 
-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.
+- [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
+
+**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).
@@ -55,23 +48,27 @@ LangChain helps developers build applications powered by LLMs through a standard
 
 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.
+- **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’s ecosystem
+## 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:
 
-- [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.
-- [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.
-- [LangGraph Platform](https://docs.langchain.com/langgraph-platform) - 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 [LangGraph Studio](https://langchain-ai.github.io/langgraph/concepts/langgraph_studio).
+- [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).
+- [Deep Agents](https://github.com/langchain-ai/deepagents) *(new!)* – Build agents that can plan, use subagents, and leverage file systems for complex tasks
 
 ## Additional resources
 
-- [Learn](https://docs.langchain.com/oss/python/learn): Use cases, conceptual overviews, and more.
-- [API Reference](https://reference.langchain.com/python): Detailed reference on
-navigating base packages and integrations for LangChain.
-- [LangChain Forum](https://forum.langchain.com): Connect with the community and share all of your technical questions, ideas, and feedback.
-- [Chat LangChain](https://chat.langchain.com): Ask questions & chat with our documentation.
+- [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/blob/master/.github/CODE_OF_CONDUCT.md) – Our community guidelines and standards for participation.

SECURITY.md

@@ -55,10 +55,10 @@ All out of scope targets defined by huntr as well as:
 * **langchain-experimental**: This repository is for experimental code and is not
   eligible for bug bounties (see [package warning](https://pypi.org/project/langchain-experimental/)), bug reports to it will be marked as interesting or waste of
   time and published with no bounty attached.
-* **tools**: Tools in either langchain or langchain-community are not eligible for bug
+* **tools**: Tools in either `langchain` or `langchain-community` are not eligible for bug
   bounties. This includes the following directories
-  * libs/langchain/langchain/tools
-  * libs/community/langchain_community/tools
+  * `libs/langchain/langchain/tools`
+  * `libs/community/langchain_community/tools`
   * Please review the [Best Practices](#best-practices)
     for more details, but generally tools interact with the real world. Developers are
     expected to understand the security implications of their code and are responsible

libs/cli/langchain_cli/integration_template/docs/vectorstores.ipynb

@@ -295,7 +295,7 @@
    "source": [
     "## TODO: Any functionality specific to this vector store\n",
     "\n",
-    "E.g. creating a persisten database to save to your disk, etc."
+    "E.g. creating a persistent database to save to your disk, etc."
    ]
   },
   {

libs/cli/langchain_cli/utils/git.py

@@ -6,9 +6,8 @@ import hashlib
 import logging
 import re
 import shutil
-from collections.abc import Sequence
 from pathlib import Path
-from typing import Any, TypedDict
+from typing import TYPE_CHECKING, Any, TypedDict
 
 from git import Repo
 
@@ -18,6 +17,9 @@ from langchain_cli.constants import (
     DEFAULT_GIT_SUBDIRECTORY,
 )
 
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+
 logger = logging.getLogger(__name__)
 
 
@@ -182,7 +184,7 @@ def parse_dependencies(
     inner_branches = _list_arg_to_length(branch, num_deps)
 
     return list(
-        map(  # type: ignore[call-overload]
+        map(  # type: ignore[call-overload, unused-ignore]
             parse_dependency_string,
             inner_deps,
             inner_repos,

libs/cli/pyproject.toml

@@ -20,12 +20,13 @@ description = "CLI for interacting with LangChain"
 readme = "README.md"
 
 [project.urls]
-homepage = "https://docs.langchain.com/"
-repository = "https://github.com/langchain-ai/langchain/tree/master/libs/cli"
-changelog = "https://github.com/langchain-ai/langchain/releases?q=%22langchain-cli%3D%3D1%22"
-twitter = "https://x.com/LangChainAI"
-slack = "https://www.langchain.com/join-community"
-reddit = "https://www.reddit.com/r/LangChain/"
+Homepage = "https://docs.langchain.com/"
+Documentation = "https://docs.langchain.com/"
+Source = "https://github.com/langchain-ai/langchain/tree/master/libs/cli"
+Changelog = "https://github.com/langchain-ai/langchain/releases?q=%22langchain-cli%3D%3D1%22"
+Twitter = "https://x.com/LangChainAI"
+Slack = "https://www.langchain.com/join-community"
+Reddit = "https://www.reddit.com/r/LangChain/"
 
 [project.scripts]
 langchain = "langchain_cli.cli:app"
@@ -42,14 +43,14 @@ lint = [
 ]
 test = [
     "langchain-core",
-    "langchain"
+    "langchain-classic"
 ]
-typing = ["langchain"]
+typing = ["langchain-classic"]
 test_integration = []
 
 [tool.uv.sources]
 langchain-core = { path = "../core", editable = true }
-langchain = { path = "../langchain", editable = true }
+langchain-classic = { path = "../langchain", editable = true }
 
 [tool.ruff.format]
 docstring-code-format = true

libs/cli/tests/unit_tests/migrate/cli_runner/case.py

@@ -1,9 +1,11 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
+from typing import TYPE_CHECKING
 
-from .file import File
-from .folder import Folder
+if TYPE_CHECKING:
+    from .file import File
+    from .folder import Folder
 
 
 @dataclass

libs/cli/tests/unit_tests/migrate/cli_runner/folder.py

@@ -1,9 +1,12 @@
 from __future__ import annotations
 
-from pathlib import Path
+from typing import TYPE_CHECKING
 
 from .file import File
 
+if TYPE_CHECKING:
+    from pathlib import Path
+
 
 class Folder:
     def __init__(self, name: str, *files: Folder | File) -> None:

libs/cli/tests/unit_tests/migrate/generate/test_langchain_migration.py

@@ -1,5 +1,5 @@
 import pytest
-from langchain._api import suppress_langchain_deprecation_warning as sup2
+from langchain_classic._api import suppress_langchain_deprecation_warning as sup2
 from langchain_core._api import suppress_langchain_deprecation_warning as sup1
 
 from langchain_cli.namespaces.migrate.generate.generic import (

libs/cli/uv.lock

@@ -327,7 +327,21 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "0.3.27"
+version = "1.0.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langchain-core" },
+    { name = "langgraph" },
+    { name = "pydantic" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/7d/b8/36078257ba52351608129ee983079a4d77ee69eb1470ee248cd8f5728a31/langchain-1.0.0.tar.gz", hash = "sha256:56bf90d935ac1dda864519372d195ca58757b755dd4c44b87840b67d069085b7", size = 466932, upload-time = "2025-10-17T20:53:20.319Z" }
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+]
+
+[[package]]
+name = "langchain-classic"
+version = "1.0.0"
 source = { editable = "../langchain" }
 dependencies = [
     { name = "async-timeout", marker = "python_full_version < '3.11'" },
@@ -344,20 +358,28 @@ dependencies = [
 requires-dist = [
     { name = "async-timeout", marker = "python_full_version < '3.11'", specifier = ">=4.0.0,<5.0.0" },
     { name = "langchain-anthropic", marker = "extra == 'anthropic'" },
-    { name = "langchain-community", marker = "extra == 'community'" },
+    { name = "langchain-aws", marker = "extra == 'aws'" },
     { name = "langchain-core", editable = "../core" },
+    { name = "langchain-deepseek", marker = "extra == 'deepseek'" },
+    { name = "langchain-fireworks", marker = "extra == 'fireworks'" },
     { name = "langchain-google-genai", marker = "extra == 'google-genai'" },
     { name = "langchain-google-vertexai", marker = "extra == 'google-vertexai'" },
+    { name = "langchain-groq", marker = "extra == 'groq'" },
+    { name = "langchain-huggingface", marker = "extra == 'huggingface'" },
+    { name = "langchain-mistralai", marker = "extra == 'mistralai'" },
+    { name = "langchain-ollama", marker = "extra == 'ollama'" },
     { name = "langchain-openai", marker = "extra == 'openai'", editable = "../partners/openai" },
+    { name = "langchain-perplexity", marker = "extra == 'perplexity'" },
     { name = "langchain-text-splitters", editable = "../text-splitters" },
     { name = "langchain-together", marker = "extra == 'together'" },
+    { name = "langchain-xai", marker = "extra == 'xai'" },
     { name = "langsmith", specifier = ">=0.1.17,<1.0.0" },
     { name = "pydantic", specifier = ">=2.7.4,<3.0.0" },
     { name = "pyyaml", specifier = ">=5.3.0,<7.0.0" },
     { name = "requests", specifier = ">=2.0.0,<3.0.0" },
     { name = "sqlalchemy", specifier = ">=1.4.0,<3.0.0" },
 ]
-provides-extras = ["community", "anthropic", "openai", "google-vertexai", "google-genai", "together"]
+provides-extras = ["anthropic", "openai", "google-vertexai", "google-genai", "fireworks", "ollama", "together", "mistralai", "huggingface", "groq", "aws", "deepseek", "xai", "perplexity"]
 
 [package.metadata.requires-dev]
 dev = [
@@ -376,7 +398,6 @@ test = [
     { name = "blockbuster", specifier = ">=1.5.18,<1.6.0" },
     { name = "cffi", marker = "python_full_version < '3.10'", specifier = "<1.17.1" },
     { name = "cffi", marker = "python_full_version >= '3.10'" },
-    { name = "duckdb-engine", specifier = ">=0.9.2,<1.0.0" },
     { name = "freezegun", specifier = ">=1.2.2,<2.0.0" },
     { name = "langchain-core", editable = "../core" },
     { name = "langchain-openai", editable = "../partners/openai" },
@@ -411,9 +432,10 @@ test-integration = [
     { name = "wrapt", specifier = ">=1.15.0,<2.0.0" },
 ]
 typing = [
+    { name = "fastapi", specifier = ">=0.116.1,<1.0.0" },
     { name = "langchain-core", editable = "../core" },
     { name = "langchain-text-splitters", editable = "../text-splitters" },
-    { name = "mypy", specifier = ">=1.15.0,<1.16.0" },
+    { name = "mypy", specifier = ">=1.18.2,<1.19.0" },
     { name = "mypy-protobuf", specifier = ">=3.0.0,<4.0.0" },
     { name = "numpy", marker = "python_full_version < '3.13'", specifier = ">=1.26.4" },
     { name = "numpy", marker = "python_full_version >= '3.13'", specifier = ">=2.1.0" },
@@ -448,11 +470,11 @@ lint = [
     { name = "ruff" },
 ]
 test = [
-    { name = "langchain" },
+    { name = "langchain-classic" },
     { name = "langchain-core" },
 ]
 typing = [
-    { name = "langchain" },
+    { name = "langchain-classic" },
 ]
 
 [package.metadata]
@@ -475,15 +497,15 @@ lint = [
     { name = "ruff", specifier = ">=0.13.1,<0.14" },
 ]
 test = [
-    { name = "langchain", editable = "../langchain" },
+    { name = "langchain-classic", editable = "../langchain" },
     { name = "langchain-core", editable = "../core" },
 ]
 test-integration = []
-typing = [{ name = "langchain", editable = "../langchain" }]
+typing = [{ name = "langchain-classic", editable = "../langchain" }]
 
 [[package]]
 name = "langchain-core"
-version = "1.0.0a6"
+version = "1.0.0"
 source = { editable = "../core" }
 dependencies = [
     { name = "jsonpatch" },
@@ -541,7 +563,7 @@ typing = [
 
 [[package]]
 name = "langchain-text-splitters"
-version = "1.0.0a1"
+version = "1.0.0"
 source = { editable = "../text-splitters" }
 dependencies = [
     { name = "langchain-core" },
@@ -574,8 +596,8 @@ test-integration = [
     { 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,<4.0.0" },
-    { name = "spacy", specifier = ">=3.8.7,<4.0.0" },
+    { name = "sentence-transformers", marker = "python_full_version < '3.14'", specifier = ">=3.0.1,<4.0.0" },
+    { name = "spacy", marker = "python_full_version < '3.14'", specifier = ">=3.8.7,<4.0.0" },
     { name = "thinc", specifier = ">=8.3.6,<9.0.0" },
     { name = "tiktoken", specifier = ">=0.8.0,<1.0.0" },
     { name = "transformers", specifier = ">=4.51.3,<5.0.0" },
@@ -588,6 +610,62 @@ typing = [
     { name = "types-requests", specifier = ">=2.31.0.20240218,<3.0.0.0" },
 ]
 
+[[package]]
+name = "langgraph"
+version = "1.0.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langchain-core" },
+    { name = "langgraph-checkpoint" },
+    { name = "langgraph-prebuilt" },
+    { name = "langgraph-sdk" },
+    { name = "pydantic" },
+    { name = "xxhash" },
+]
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+]
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+[[package]]
+name = "langgraph-checkpoint"
+version = "2.1.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langchain-core" },
+    { name = "ormsgpack" },
+]
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+]
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+[[package]]
+name = "langgraph-prebuilt"
+version = "1.0.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langchain-core" },
+    { name = "langgraph-checkpoint" },
+]
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+]
+
+[[package]]
+name = "langgraph-sdk"
+version = "0.2.9"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "httpx" },
+    { name = "orjson" },
+]
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 name = "langserve"
 version = "0.0.51"
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 ]
 
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+]
+
 [[package]]
 name = "zstandard"
 version = "0.25.0"

libs/core/README.md

@@ -34,7 +34,7 @@ The LangChain ecosystem is built on top of `langchain-core`. Some of the benefit
 
 ## 📖 Documentation
 
-For full documentation, see the [API reference](https://reference.langchain.com/python/langchain_core/).
+For full documentation, see the [API reference](https://reference.langchain.com/python/langchain_core/). For conceptual guides, tutorials, and examples on using LangChain, see the [LangChain Docs](https://docs.langchain.com/oss/python/langchain/overview).
 
 ## 📕 Releases & Versioning
 

libs/core/langchain_core/agents.py

@@ -5,12 +5,10 @@
 
 !!! warning
     New agents should be built using the
-    [langgraph library](https://github.com/langchain-ai/langgraph), which provides a
+    [`langchain` library](https://pypi.org/project/langchain/), which provides a
     simpler and more flexible way to define agents.
 
-    Please see the
-    [migration guide](https://python.langchain.com/docs/how_to/migrate_agent/) for
-    information on how to migrate existing agents to modern langgraph agents.
+    See docs on [building agents](https://docs.langchain.com/oss/python/langchain/agents).
 
 Agents use language models to choose a sequence of actions to take.
 
@@ -54,31 +52,33 @@ class AgentAction(Serializable):
     """The input to pass in to the Tool."""
     log: str
     """Additional information to log about the action.
-    This log can be used in a few ways. First, it can be used to audit
-    what exactly the LLM predicted to lead to this (tool, tool_input).
-    Second, it can be used in future iterations to show the LLMs prior
-    thoughts. This is useful when (tool, tool_input) does not contain
-    full information about the LLM prediction (for example, any `thought`
-    before the tool/tool_input)."""
+
+    This log can be used in a few ways. First, it can be used to audit what exactly the
+    LLM predicted to lead to this `(tool, tool_input)`.
+
+    Second, it can be used in future iterations to show the LLMs prior thoughts. This is
+    useful when `(tool, tool_input)` does not contain full information about the LLM
+    prediction (for example, any `thought` before the tool/tool_input).
+    """
     type: Literal["AgentAction"] = "AgentAction"
 
     # Override init to support instantiation by position for backward compat.
     def __init__(self, tool: str, tool_input: str | dict, log: str, **kwargs: Any):
-        """Create an AgentAction.
+        """Create an `AgentAction`.
 
         Args:
             tool: The name of the tool to execute.
-            tool_input: The input to pass in to the Tool.
+            tool_input: The input to pass in to the `Tool`.
             log: Additional information to log about the action.
         """
         super().__init__(tool=tool, tool_input=tool_input, log=log, **kwargs)
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """AgentAction is serializable.
+        """`AgentAction` is serializable.
 
         Returns:
-            True
+            `True`
         """
         return True
 
@@ -100,19 +100,23 @@ class AgentAction(Serializable):
 class AgentActionMessageLog(AgentAction):
     """Representation of an action to be executed by an agent.
 
-    This is similar to AgentAction, but includes a message log consisting of
-    chat messages. This is useful when working with ChatModels, and is used
-    to reconstruct conversation history from the agent's perspective.
+    This is similar to `AgentAction`, but includes a message log consisting of
+    chat messages.
+
+    This is useful when working with `ChatModels`, and is used to reconstruct
+    conversation history from the agent's perspective.
     """
 
     message_log: Sequence[BaseMessage]
-    """Similar to log, this can be used to pass along extra
-    information about what exact messages were predicted by the LLM
-    before parsing out the (tool, tool_input). This is again useful
-    if (tool, tool_input) cannot be used to fully recreate the LLM
-    prediction, and you need that LLM prediction (for future agent iteration).
+    """Similar to log, this can be used to pass along extra information about what exact
+    messages were predicted by the LLM before parsing out the `(tool, tool_input)`.
+
+    This is again useful if `(tool, tool_input)` cannot be used to fully recreate the
+    LLM prediction, and you need that LLM prediction (for future agent iteration).
+
     Compared to `log`, this is useful when the underlying LLM is a
-    chat model (and therefore returns messages rather than a string)."""
+    chat model (and therefore returns messages rather than a string).
+    """
     # Ignoring type because we're overriding the type from AgentAction.
     # And this is the correct thing to do in this case.
     # The type literal is used for serialization purposes.
@@ -120,12 +124,12 @@ class AgentActionMessageLog(AgentAction):
 
 
 class AgentStep(Serializable):
-    """Result of running an AgentAction."""
+    """Result of running an `AgentAction`."""
 
     action: AgentAction
-    """The AgentAction that was executed."""
+    """The `AgentAction` that was executed."""
     observation: Any
-    """The result of the AgentAction."""
+    """The result of the `AgentAction`."""
 
     @property
     def messages(self) -> Sequence[BaseMessage]:
@@ -134,19 +138,22 @@ class AgentStep(Serializable):
 
 
 class AgentFinish(Serializable):
-    """Final return value of an ActionAgent.
+    """Final return value of an `ActionAgent`.
 
-    Agents return an AgentFinish when they have reached a stopping condition.
+    Agents return an `AgentFinish` when they have reached a stopping condition.
     """
 
     return_values: dict
     """Dictionary of return values."""
     log: str
     """Additional information to log about the return value.
+
     This is used to pass along the full LLM prediction, not just the parsed out
-    return value. For example, if the full LLM prediction was
-    `Final Answer: 2` you may want to just return `2` as a return value, but pass
-    along the full string as a `log` (for debugging or observability purposes).
+    return value.
+
+    For example, if the full LLM prediction was `Final Answer: 2` you may want to just
+    return `2` as a return value, but pass along the full string as a `log` (for
+    debugging or observability purposes).
     """
     type: Literal["AgentFinish"] = "AgentFinish"
 
@@ -156,7 +163,7 @@ class AgentFinish(Serializable):
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -204,7 +211,7 @@ def _convert_agent_observation_to_messages(
         observation: Observation to convert to a message.
 
     Returns:
-        AIMessage that corresponds to the original tool invocation.
+        `AIMessage` that corresponds to the original tool invocation.
     """
     if isinstance(agent_action, AgentActionMessageLog):
         return [_create_function_message(agent_action, observation)]
@@ -227,7 +234,7 @@ def _create_function_message(
         observation: the result of the tool invocation.
 
     Returns:
-        FunctionMessage that corresponds to the original tool invocation.
+        `FunctionMessage` that corresponds to the original tool invocation.
     """
     if not isinstance(observation, str):
         try:

libs/core/langchain_core/caches.py

@@ -1,7 +1,9 @@
-"""`caches` provides an optional caching layer for language models.
+"""Optional caching layer for language models.
 
-!!! warning
-    This is a beta feature! Please be wary of deploying experimental code to production
+Distinct from provider-based [prompt caching](https://docs.langchain.com/oss/python/langchain/models#prompt-caching).
+
+!!! warning "Beta feature"
+    This is a beta feature. Please be wary of deploying experimental code to production
     unless you've taken appropriate precautions.
 
 A cache is useful for two reasons:
@@ -47,17 +49,18 @@ class BaseCache(ABC):
         """Look up based on `prompt` and `llm_string`.
 
         A cache implementation is expected to generate a key from the 2-tuple
-        of prompt and llm_string (e.g., by concatenating them with a delimiter).
+        of `prompt` and `llm_string` (e.g., by concatenating them with a delimiter).
 
         Args:
             prompt: A string representation of the prompt.
                 In the case of a chat model, the prompt is a non-trivial
                 serialization of the prompt into the language model.
             llm_string: A string representation of the LLM configuration.
+
                 This is used to capture the invocation parameters of the LLM
                 (e.g., model name, temperature, stop tokens, max tokens, etc.).
-                These invocation parameters are serialized into a string
-                representation.
+
+                These invocation parameters are serialized into a string representation.
 
         Returns:
             On a cache miss, return `None`. On a cache hit, return the cached value.
@@ -76,8 +79,10 @@ class BaseCache(ABC):
                 In the case of a chat model, the prompt is a non-trivial
                 serialization of the prompt into the language model.
             llm_string: A string representation of the LLM configuration.
+
                 This is used to capture the invocation parameters of the LLM
                 (e.g., model name, temperature, stop tokens, max tokens, etc.).
+
                 These invocation parameters are serialized into a string
                 representation.
             return_val: The value to be cached. The value is a list of `Generation`
@@ -92,15 +97,17 @@ class BaseCache(ABC):
         """Async look up based on `prompt` and `llm_string`.
 
         A cache implementation is expected to generate a key from the 2-tuple
-        of prompt and llm_string (e.g., by concatenating them with a delimiter).
+        of `prompt` and `llm_string` (e.g., by concatenating them with a delimiter).
 
         Args:
             prompt: A string representation of the prompt.
                 In the case of a chat model, the prompt is a non-trivial
                 serialization of the prompt into the language model.
             llm_string: A string representation of the LLM configuration.
+
                 This is used to capture the invocation parameters of the LLM
                 (e.g., model name, temperature, stop tokens, max tokens, etc.).
+
                 These invocation parameters are serialized into a string
                 representation.
 
@@ -123,8 +130,10 @@ class BaseCache(ABC):
                 In the case of a chat model, the prompt is a non-trivial
                 serialization of the prompt into the language model.
             llm_string: A string representation of the LLM configuration.
+
                 This is used to capture the invocation parameters of the LLM
                 (e.g., model name, temperature, stop tokens, max tokens, etc.).
+
                 These invocation parameters are serialized into a string
                 representation.
             return_val: The value to be cached. The value is a list of `Generation`

libs/core/langchain_core/callbacks/base.py

@@ -5,13 +5,12 @@ from __future__ import annotations
 import logging
 from typing import TYPE_CHECKING, Any
 
-from typing_extensions import Self
-
 if TYPE_CHECKING:
     from collections.abc import Sequence
     from uuid import UUID
 
     from tenacity import RetryCallState
+    from typing_extensions import Self
 
     from langchain_core.agents import AgentAction, AgentFinish
     from langchain_core.documents import Document
@@ -420,8 +419,6 @@ class RunManagerMixin:
                 (includes inherited tags).
             metadata: The metadata associated with the custom event
                 (includes inherited metadata).
-
-        !!! version-added "Added in version 0.2.15"
         """
 
 
@@ -882,8 +879,6 @@ class AsyncCallbackHandler(BaseCallbackHandler):
                 (includes inherited tags).
             metadata: The metadata associated with the custom event
                 (includes inherited metadata).
-
-        !!! version-added "Added in version 0.2.15"
         """
 
 

libs/core/langchain_core/callbacks/manager.py

@@ -39,7 +39,6 @@ from langchain_core.tracers.context import (
     tracing_v2_callback_var,
 )
 from langchain_core.tracers.langchain import LangChainTracer
-from langchain_core.tracers.schemas import Run
 from langchain_core.tracers.stdout import ConsoleCallbackHandler
 from langchain_core.utils.env import env_var_is_set
 
@@ -52,6 +51,7 @@ if TYPE_CHECKING:
     from langchain_core.documents import Document
     from langchain_core.outputs import ChatGenerationChunk, GenerationChunk, LLMResult
     from langchain_core.runnables.config import RunnableConfig
+    from langchain_core.tracers.schemas import Run
 
 logger = logging.getLogger(__name__)
 
@@ -229,7 +229,24 @@ def shielded(func: Func) -> Func:
 
     @functools.wraps(func)
     async def wrapped(*args: Any, **kwargs: Any) -> Any:
-        return await asyncio.shield(func(*args, **kwargs))
+        # Capture the current context to preserve context variables
+        ctx = copy_context()
+
+        # Create the coroutine
+        coro = func(*args, **kwargs)
+
+        # For Python 3.11+, create task with explicit context
+        # For older versions, fallback to original behavior
+        try:
+            # Create a task with the captured context to preserve context variables
+            task = asyncio.create_task(coro, context=ctx)  # type: ignore[call-arg, unused-ignore]
+            # `call-arg` used to not fail 3.9 or 3.10 tests
+            return await asyncio.shield(task)
+        except TypeError:
+            # Python < 3.11 fallback - create task normally then shield
+            # This won't preserve context perfectly but is better than nothing
+            task = asyncio.create_task(coro)
+            return await asyncio.shield(task)
 
     return cast("Func", wrapped)
 
@@ -1566,9 +1583,6 @@ class CallbackManager(BaseCallbackManager):
 
         Raises:
             ValueError: If additional keyword arguments are passed.
-
-        !!! version-added "Added in version 0.2.14"
-
         """
         if not self.handlers:
             return
@@ -2042,8 +2056,6 @@ class AsyncCallbackManager(BaseCallbackManager):
 
         Raises:
             ValueError: If additional keyword arguments are passed.
-
-        !!! version-added "Added in version 0.2.14"
         """
         if not self.handlers:
             return
@@ -2555,9 +2567,6 @@ async def adispatch_custom_event(
         This is due to a limitation in asyncio for python <= 3.10 that prevents
         LangChain from automatically propagating the config object on the user's
         behalf.
-
-    !!! version-added "Added in version 0.2.15"
-
     """
     # Import locally to prevent circular imports.
     from langchain_core.runnables.config import (  # noqa: PLC0415
@@ -2630,9 +2639,6 @@ def dispatch_custom_event(
         foo_ = RunnableLambda(foo)
         foo_.invoke({"a": "1"}, {"callbacks": [CustomCallbackManager()]})
         ```
-
-    !!! version-added "Added in version 0.2.15"
-
     """
     # Import locally to prevent circular imports.
     from langchain_core.runnables.config import (  # noqa: PLC0415

libs/core/langchain_core/callbacks/usage.py

@@ -24,7 +24,7 @@ class UsageMetadataCallbackHandler(BaseCallbackHandler):
         from langchain_core.callbacks import UsageMetadataCallbackHandler
 
         llm_1 = init_chat_model(model="openai:gpt-4o-mini")
-        llm_2 = init_chat_model(model="anthropic:claude-3-5-haiku-latest")
+        llm_2 = init_chat_model(model="anthropic:claude-3-5-haiku-20241022")
 
         callback = UsageMetadataCallbackHandler()
         result_1 = llm_1.invoke("Hello", config={"callbacks": [callback]})
@@ -43,7 +43,7 @@ class UsageMetadataCallbackHandler(BaseCallbackHandler):
           'input_token_details': {'cache_read': 0, 'cache_creation': 0}}}
         ```
 
-    !!! version-added "Added in version 0.3.49"
+    !!! version-added "Added in `langchain-core` 0.3.49"
 
     """
 
@@ -109,7 +109,7 @@ def get_usage_metadata_callback(
         from langchain_core.callbacks import get_usage_metadata_callback
 
         llm_1 = init_chat_model(model="openai:gpt-4o-mini")
-        llm_2 = init_chat_model(model="anthropic:claude-3-5-haiku-latest")
+        llm_2 = init_chat_model(model="anthropic:claude-3-5-haiku-20241022")
 
         with get_usage_metadata_callback() as cb:
             llm_1.invoke("Hello")
@@ -134,7 +134,7 @@ def get_usage_metadata_callback(
         }
         ```
 
-    !!! version-added "Added in version 0.3.49"
+    !!! version-added "Added in `langchain-core` 0.3.49"
 
     """
     usage_metadata_callback_var: ContextVar[UsageMetadataCallbackHandler | None] = (

libs/core/langchain_core/chat_history.py

@@ -121,7 +121,7 @@ class BaseChatMessageHistory(ABC):
         This method may be deprecated in a future release.
 
         Args:
-            message: The human message to add to the store.
+            message: The `HumanMessage` to add to the store.
         """
         if isinstance(message, HumanMessage):
             self.add_message(message)
@@ -129,7 +129,7 @@ class BaseChatMessageHistory(ABC):
             self.add_message(HumanMessage(content=message))
 
     def add_ai_message(self, message: AIMessage | str) -> None:
-        """Convenience method for adding an AI message string to the store.
+        """Convenience method for adding an `AIMessage` string to the store.
 
         !!! note
             This is a convenience method. Code should favor the bulk `add_messages`
@@ -138,7 +138,7 @@ class BaseChatMessageHistory(ABC):
         This method may be deprecated in a future release.
 
         Args:
-            message: The AI message to add.
+            message: The `AIMessage` to add.
         """
         if isinstance(message, AIMessage):
             self.add_message(message)
@@ -173,7 +173,7 @@ class BaseChatMessageHistory(ABC):
         in an efficient manner to avoid unnecessary round-trips to the underlying store.
 
         Args:
-            messages: A sequence of BaseMessage objects to store.
+            messages: A sequence of `BaseMessage` objects to store.
         """
         for message in messages:
             self.add_message(message)
@@ -182,7 +182,7 @@ class BaseChatMessageHistory(ABC):
         """Async add a list of messages.
 
         Args:
-            messages: A sequence of BaseMessage objects to store.
+            messages: A sequence of `BaseMessage` objects to store.
         """
         await run_in_executor(None, self.add_messages, messages)
 

libs/core/langchain_core/document_loaders/base.py

@@ -27,7 +27,7 @@ class BaseLoader(ABC):  # noqa: B024
     """Interface for Document Loader.
 
     Implementations should implement the lazy-loading method using generators
-    to avoid loading all Documents into memory at once.
+    to avoid loading all documents into memory at once.
 
     `load` is provided just for user convenience and should not be overridden.
     """
@@ -53,9 +53,11 @@ class BaseLoader(ABC):  # noqa: B024
     def load_and_split(
         self, text_splitter: TextSplitter | None = None
     ) -> list[Document]:
-        """Load Documents and split into chunks. Chunks are returned as `Document`.
+        """Load `Document` and split into chunks. Chunks are returned as `Document`.
 
-        Do not override this method. It should be considered to be deprecated!
+        !!! danger
+
+            Do not override this method. It should be considered to be deprecated!
 
         Args:
             text_splitter: `TextSplitter` instance to use for splitting documents.
@@ -135,7 +137,7 @@ class BaseBlobParser(ABC):
         """
 
     def parse(self, blob: Blob) -> list[Document]:
-        """Eagerly parse the blob into a `Document` or `Document` objects.
+        """Eagerly parse the blob into a `Document` or list of `Document` objects.
 
         This is a convenience method for interactive development environment.
 

libs/core/langchain_core/document_loaders/blob_loaders.py

@@ -28,7 +28,7 @@ class BlobLoader(ABC):
     def yield_blobs(
         self,
     ) -> Iterable[Blob]:
-        """A lazy loader for raw data represented by LangChain's Blob object.
+        """A lazy loader for raw data represented by LangChain's `Blob` object.
 
         Returns:
             A generator over blobs

libs/core/langchain_core/document_loaders/langsmith.py

@@ -14,13 +14,13 @@ from langchain_core.documents import Document
 
 
 class LangSmithLoader(BaseLoader):
-    """Load LangSmith Dataset examples as Documents.
+    """Load LangSmith Dataset examples as `Document` objects.
 
-    Loads the example inputs as the Document page content and places the entire example
-    into the Document metadata. This allows you to easily create few-shot example
-    retrievers from the loaded documents.
+    Loads the example inputs as the `Document` page content and places the entire
+    example into the `Document` metadata. This allows you to easily create few-shot
+    example retrievers from the loaded documents.
 
-    ??? note "Lazy load"
+    ??? note "Lazy loading example"
 
         ```python
         from langchain_core.document_loaders import LangSmithLoader
@@ -34,9 +34,6 @@ class LangSmithLoader(BaseLoader):
         ```python
         # -> [Document("...", metadata={"inputs": {...}, "outputs": {...}, ...}), ...]
         ```
-
-    !!! version-added "Added in version 0.2.34"
-
     """
 
     def __init__(
@@ -69,12 +66,11 @@ class LangSmithLoader(BaseLoader):
             format_content: Function for converting the content extracted from the example
                 inputs into a string. Defaults to JSON-encoding the contents.
             example_ids: The IDs of the examples to filter by.
-            as_of: The dataset version tag OR
-                timestamp to retrieve the examples as of.
-                Response examples will only be those that were present at the time
-                of the tagged (or timestamped) version.
+            as_of: The dataset version tag or timestamp to retrieve the examples as of.
+                Response examples will only be those that were present at the time of
+                the tagged (or timestamped) version.
             splits: A list of dataset splits, which are
-                divisions of your dataset such as 'train', 'test', or 'validation'.
+                divisions of your dataset such as `train`, `test`, or `validation`.
                 Returns examples only from the specified splits.
             inline_s3_urls: Whether to inline S3 URLs.
             offset: The offset to start from.

libs/core/langchain_core/documents/__init__.py

@@ -1,7 +1,28 @@
-"""Documents module.
+"""Documents module for data retrieval and processing workflows.
 
-**Document** module is a collection of classes that handle documents
-and their transformations.
+This module provides core abstractions for handling data in retrieval-augmented
+generation (RAG) pipelines, vector stores, and document processing workflows.
+
+!!! warning "Documents vs. message content"
+    This module is distinct from `langchain_core.messages.content`, which provides
+    multimodal content blocks for **LLM chat I/O** (text, images, audio, etc. within
+    messages).
+
+    **Key distinction:**
+
+    - **Documents** (this module): For **data retrieval and processing workflows**
+        - Vector stores, retrievers, RAG pipelines
+        - Text chunking, embedding, and semantic search
+        - Example: Chunks of a PDF stored in a vector database
+
+    - **Content Blocks** (`messages.content`): For **LLM conversational I/O**
+        - Multimodal message content sent to/from models
+        - Tool calls, reasoning, citations within chat
+        - Example: An image sent to a vision model in a chat message (via
+            [`ImageContentBlock`][langchain.messages.ImageContentBlock])
+
+    While both can represent similar data types (text, files), they serve different
+    architectural purposes in LangChain applications.
 """
 
 from typing import TYPE_CHECKING

libs/core/langchain_core/documents/base.py

@@ -1,4 +1,16 @@
-"""Base classes for media and documents."""
+"""Base classes for media and documents.
+
+This module contains core abstractions for **data retrieval and processing workflows**:
+
+- `BaseMedia`: Base class providing `id` and `metadata` fields
+- `Blob`: Raw data loading (files, binary data) - used by document loaders
+- `Document`: Text content for retrieval (RAG, vector stores, semantic search)
+
+!!! note "Not for LLM chat messages"
+    These classes are for data processing pipelines, not LLM I/O. For multimodal
+    content in chat messages (images, audio in conversations), see
+    `langchain.messages` content blocks instead.
+"""
 
 from __future__ import annotations
 
@@ -19,27 +31,23 @@ PathLike = str | PurePath
 
 
 class BaseMedia(Serializable):
-    """Use to represent media content.
+    """Base class for content used in retrieval and data processing workflows.
 
-    Media objects can be used to represent raw data, such as text or binary data.
+    Provides common fields for content that needs to be stored, indexed, or searched.
 
-    LangChain Media objects allow associating metadata and an optional identifier
-    with the content.
-
-    The presence of an ID and metadata make it easier to store, index, and search
-    over the content in a structured way.
+    !!! note
+        For multimodal content in **chat messages** (images, audio sent to/from LLMs),
+        use `langchain.messages` content blocks instead.
     """
 
     # The ID field is optional at the moment.
     # It will likely become required in a future major release after
-    # it has been adopted by enough vectorstore implementations.
+    # it has been adopted by enough VectorStore implementations.
     id: str | None = Field(default=None, coerce_numbers_to_str=True)
     """An optional identifier for the document.
 
     Ideally this should be unique across the document collection and formatted
     as a UUID, but this will not be enforced.
-
-    !!! version-added "Added in version 0.2.11"
     """
 
     metadata: dict = Field(default_factory=dict)
@@ -47,71 +55,70 @@ class BaseMedia(Serializable):
 
 
 class Blob(BaseMedia):
-    """Blob represents raw data by either reference or value.
+    """Raw data abstraction for document loading and file processing.
 
-    Provides an interface to materialize the blob in different representations, and
-    help to decouple the development of data loaders from the downstream parsing of
-    the raw data.
+    Represents raw bytes or text, either in-memory or by file reference. Used
+    primarily by document loaders to decouple data loading from parsing.
 
-    Inspired by: https://developer.mozilla.org/en-US/docs/Web/API/Blob
+    Inspired by [Mozilla's `Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob)
 
-    Example: Initialize a blob from in-memory data
+    ???+ example "Initialize a blob from in-memory data"
 
-    ```python
-    from langchain_core.documents import Blob
+        ```python
+        from langchain_core.documents import Blob
 
-    blob = Blob.from_data("Hello, world!")
+        blob = Blob.from_data("Hello, world!")
 
-    # Read the blob as a string
-    print(blob.as_string())
+        # Read the blob as a string
+        print(blob.as_string())
 
-    # Read the blob as bytes
-    print(blob.as_bytes())
+        # Read the blob as bytes
+        print(blob.as_bytes())
 
-    # Read the blob as a byte stream
-    with blob.as_bytes_io() as f:
-        print(f.read())
-    ```
+        # Read the blob as a byte stream
+        with blob.as_bytes_io() as f:
+            print(f.read())
+        ```
 
-    Example: Load from memory and specify mime-type and metadata
+    ??? example "Load from memory and specify MIME type and metadata"
 
-    ```python
-    from langchain_core.documents import Blob
+        ```python
+        from langchain_core.documents import Blob
 
-    blob = Blob.from_data(
-        data="Hello, world!",
-        mime_type="text/plain",
-        metadata={"source": "https://example.com"},
-    )
-    ```
+        blob = Blob.from_data(
+            data="Hello, world!",
+            mime_type="text/plain",
+            metadata={"source": "https://example.com"},
+        )
+        ```
 
-    Example: Load the blob from a file
+    ??? example "Load the blob from a file"
 
-    ```python
-    from langchain_core.documents import Blob
+        ```python
+        from langchain_core.documents import Blob
 
-    blob = Blob.from_path("path/to/file.txt")
+        blob = Blob.from_path("path/to/file.txt")
 
-    # Read the blob as a string
-    print(blob.as_string())
+        # Read the blob as a string
+        print(blob.as_string())
 
-    # Read the blob as bytes
-    print(blob.as_bytes())
+        # Read the blob as bytes
+        print(blob.as_bytes())
 
-    # Read the blob as a byte stream
-    with blob.as_bytes_io() as f:
-        print(f.read())
-    ```
+        # Read the blob as a byte stream
+        with blob.as_bytes_io() as f:
+            print(f.read())
+        ```
     """
 
     data: bytes | str | None = None
-    """Raw data associated with the blob."""
+    """Raw data associated with the `Blob`."""
     mimetype: str | None = None
-    """MimeType not to be confused with a file extension."""
+    """MIME type, not to be confused with a file extension."""
     encoding: str = "utf-8"
     """Encoding to use if decoding the bytes into a string.
 
-    Use `utf-8` as default encoding, if decoding to string.
+    Uses `utf-8` as default encoding if decoding to string.
     """
     path: PathLike | None = None
     """Location where the original content was found."""
@@ -125,9 +132,9 @@ class Blob(BaseMedia):
     def source(self) -> str | None:
         """The source location of the blob as string if known otherwise none.
 
-        If a path is associated with the blob, it will default to the path location.
+        If a path is associated with the `Blob`, it will default to the path location.
 
-        Unless explicitly set via a metadata field called `"source"`, in which
+        Unless explicitly set via a metadata field called `'source'`, in which
         case that value will be used instead.
         """
         if self.metadata and "source" in self.metadata:
@@ -213,13 +220,13 @@ class Blob(BaseMedia):
         Args:
             path: Path-like object to file to be read
             encoding: Encoding to use if decoding the bytes into a string
-            mime_type: If provided, will be set as the mime-type of the data
-            guess_type: If `True`, the mimetype will be guessed from the file extension,
-                if a mime-type was not provided
-            metadata: Metadata to associate with the blob
+            mime_type: If provided, will be set as the MIME type of the data
+            guess_type: If `True`, the MIME type will be guessed from the file
+                extension, if a MIME type was not provided
+            metadata: Metadata to associate with the `Blob`
 
         Returns:
-            Blob instance
+            `Blob` instance
         """
         if mime_type is None and guess_type:
             mimetype = mimetypes.guess_type(path)[0] if guess_type else None
@@ -245,17 +252,17 @@ class Blob(BaseMedia):
         path: str | None = None,
         metadata: dict | None = None,
     ) -> Blob:
-        """Initialize the blob from in-memory data.
+        """Initialize the `Blob` from in-memory data.
 
         Args:
-            data: The in-memory data associated with the blob
+            data: The in-memory data associated with the `Blob`
             encoding: Encoding to use if decoding the bytes into a string
-            mime_type: If provided, will be set as the mime-type of the data
+            mime_type: If provided, will be set as the MIME type of the data
             path: If provided, will be set as the source from which the data came
-            metadata: Metadata to associate with the blob
+            metadata: Metadata to associate with the `Blob`
 
         Returns:
-            Blob instance
+            `Blob` instance
         """
         return cls(
             data=data,
@@ -276,6 +283,10 @@ class Blob(BaseMedia):
 class Document(BaseMedia):
     """Class for storing a piece of text and associated metadata.
 
+    !!! note
+        `Document` is for **retrieval workflows**, not chat I/O. For sending text
+        to an LLM in a conversation, use message types from `langchain.messages`.
+
     Example:
         ```python
         from langchain_core.documents import Document
@@ -298,7 +309,7 @@ class Document(BaseMedia):
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -311,10 +322,10 @@ class Document(BaseMedia):
         return ["langchain", "schema", "document"]
 
     def __str__(self) -> str:
-        """Override __str__ to restrict it to page_content and metadata.
+        """Override `__str__` to restrict it to page_content and metadata.
 
         Returns:
-            A string representation of the Document.
+            A string representation of the `Document`.
         """
         # The format matches pydantic format for __str__.
         #

libs/core/langchain_core/documents/compressor.py

@@ -21,14 +21,14 @@ class BaseDocumentCompressor(BaseModel, ABC):
 
     This abstraction is primarily used for post-processing of retrieved documents.
 
-    Documents matching a given query are first retrieved.
+    `Document` objects matching a given query are first retrieved.
 
     Then the list of documents can be further processed.
 
     For example, one could re-rank the retrieved documents using an LLM.
 
     !!! note
-        Users should favor using a RunnableLambda instead of sub-classing from this
+        Users should favor using a `RunnableLambda` instead of sub-classing from this
         interface.
 
     """
@@ -43,9 +43,9 @@ class BaseDocumentCompressor(BaseModel, ABC):
         """Compress retrieved documents given the query context.
 
         Args:
-            documents: The retrieved documents.
+            documents: The retrieved `Document` objects.
             query: The query context.
-            callbacks: Optional callbacks to run during compression.
+            callbacks: Optional `Callbacks` to run during compression.
 
         Returns:
             The compressed documents.
@@ -61,9 +61,9 @@ class BaseDocumentCompressor(BaseModel, ABC):
         """Async compress retrieved documents given the query context.
 
         Args:
-            documents: The retrieved documents.
+            documents: The retrieved `Document` objects.
             query: The query context.
-            callbacks: Optional callbacks to run during compression.
+            callbacks: Optional `Callbacks` to run during compression.
 
         Returns:
             The compressed documents.

libs/core/langchain_core/documents/transformers.py

@@ -16,8 +16,8 @@ if TYPE_CHECKING:
 class BaseDocumentTransformer(ABC):
     """Abstract base class for document transformation.
 
-    A document transformation takes a sequence of Documents and returns a
-    sequence of transformed Documents.
+    A document transformation takes a sequence of `Document` objects and returns a
+    sequence of transformed `Document` objects.
 
     Example:
         ```python
@@ -57,10 +57,10 @@ class BaseDocumentTransformer(ABC):
         """Transform a list of documents.
 
         Args:
-            documents: A sequence of Documents to be transformed.
+            documents: A sequence of `Document` objects to be transformed.
 
         Returns:
-            A sequence of transformed Documents.
+            A sequence of transformed `Document` objects.
         """
 
     async def atransform_documents(
@@ -69,10 +69,10 @@ class BaseDocumentTransformer(ABC):
         """Asynchronously transform a list of documents.
 
         Args:
-            documents: A sequence of Documents to be transformed.
+            documents: A sequence of `Document` objects to be transformed.
 
         Returns:
-            A sequence of transformed Documents.
+            A sequence of transformed `Document` objects.
         """
         return await run_in_executor(
             None, self.transform_documents, documents, **kwargs

libs/core/langchain_core/embeddings/fake.py

@@ -18,7 +18,7 @@ class FakeEmbeddings(Embeddings, BaseModel):
 
     This embedding model creates embeddings by sampling from a normal distribution.
 
-    !!! warning
+    !!! danger "Toy model"
         Do not use this outside of testing, as it is not a real embedding model.
 
     Instantiate:
@@ -73,7 +73,7 @@ class DeterministicFakeEmbedding(Embeddings, BaseModel):
     This embedding model creates embeddings by sampling from a normal distribution
     with a seed based on the hash of the text.
 
-    !!! warning
+    !!! danger "Toy model"
         Do not use this outside of testing, as it is not a real embedding model.
 
     Instantiate:

libs/core/langchain_core/example_selectors/length_based.py

@@ -29,7 +29,7 @@ class LengthBasedExampleSelector(BaseExampleSelector, BaseModel):
     max_length: int = 2048
     """Max length for the prompt, beyond which examples are cut."""
 
-    example_text_lengths: list[int] = Field(default_factory=list)  # :meta private:
+    example_text_lengths: list[int] = Field(default_factory=list)
     """Length of each example."""
 
     def add_example(self, example: dict[str, str]) -> None:

libs/core/langchain_core/example_selectors/semantic_similarity.py

@@ -41,7 +41,7 @@ class _VectorStoreExampleSelector(BaseExampleSelector, BaseModel, ABC):
     """Optional keys to filter input to. If provided, the search is based on
     the input variables instead of all variables."""
     vectorstore_kwargs: dict[str, Any] | None = None
-    """Extra arguments passed to similarity_search function of the vectorstore."""
+    """Extra arguments passed to similarity_search function of the `VectorStore`."""
 
     model_config = ConfigDict(
         arbitrary_types_allowed=True,
@@ -159,7 +159,7 @@ class SemanticSimilarityExampleSelector(_VectorStoreExampleSelector):
                 instead of all variables.
             example_keys: If provided, keys to filter examples to.
             vectorstore_kwargs: Extra arguments passed to similarity_search function
-                of the vectorstore.
+                of the `VectorStore`.
             vectorstore_cls_kwargs: optional kwargs containing url for vector store
 
         Returns:
@@ -203,7 +203,7 @@ class SemanticSimilarityExampleSelector(_VectorStoreExampleSelector):
                 instead of all variables.
             example_keys: If provided, keys to filter examples to.
             vectorstore_kwargs: Extra arguments passed to similarity_search function
-                of the vectorstore.
+                of the `VectorStore`.
             vectorstore_cls_kwargs: optional kwargs containing url for vector store
 
         Returns:
@@ -286,12 +286,12 @@ class MaxMarginalRelevanceExampleSelector(_VectorStoreExampleSelector):
             embeddings: An initialized embedding API interface, e.g. OpenAIEmbeddings().
             vectorstore_cls: A vector store DB interface class, e.g. FAISS.
             k: Number of examples to select.
-            fetch_k: Number of Documents to fetch to pass to MMR algorithm.
+            fetch_k: Number of `Document` objects to fetch to pass to MMR algorithm.
             input_keys: If provided, the search is based on the input variables
                 instead of all variables.
             example_keys: If provided, keys to filter examples to.
             vectorstore_kwargs: Extra arguments passed to similarity_search function
-                of the vectorstore.
+                of the `VectorStore`.
             vectorstore_cls_kwargs: optional kwargs containing url for vector store
 
         Returns:
@@ -333,12 +333,12 @@ class MaxMarginalRelevanceExampleSelector(_VectorStoreExampleSelector):
             embeddings: An initialized embedding API interface, e.g. OpenAIEmbeddings().
             vectorstore_cls: A vector store DB interface class, e.g. FAISS.
             k: Number of examples to select.
-            fetch_k: Number of Documents to fetch to pass to MMR algorithm.
+            fetch_k: Number of `Document` objects to fetch to pass to MMR algorithm.
             input_keys: If provided, the search is based on the input variables
                 instead of all variables.
             example_keys: If provided, keys to filter examples to.
             vectorstore_kwargs: Extra arguments passed to similarity_search function
-                of the vectorstore.
+                of the `VectorStore`.
             vectorstore_cls_kwargs: optional kwargs containing url for vector store
 
         Returns:

libs/core/langchain_core/exceptions.py

@@ -16,9 +16,10 @@ class OutputParserException(ValueError, LangChainException):  # noqa: N818
     """Exception that output parsers should raise to signify a parsing error.
 
     This exists to differentiate parsing errors from other code or execution errors
-    that also may arise inside the output parser. `OutputParserException` will be
-    available to catch and handle in ways to fix the parsing error, while other
-    errors will be raised.
+    that also may arise inside the output parser.
+
+    `OutputParserException` will be available to catch and handle in ways to fix the
+    parsing error, while other errors will be raised.
     """
 
     def __init__(
@@ -32,18 +33,19 @@ class OutputParserException(ValueError, LangChainException):  # noqa: N818
 
         Args:
             error: The error that's being re-raised or an error message.
-            observation: String explanation of error which can be passed to a
-                model to try and remediate the issue.
+            observation: String explanation of error which can be passed to a model to
+                try and remediate the issue.
             llm_output: String model output which is error-ing.
 
             send_to_llm: Whether to send the observation and llm_output back to an Agent
                 after an `OutputParserException` has been raised.
+
                 This gives the underlying model driving the agent the context that the
                 previous output was improperly structured, in the hopes that it will
                 update the output to the correct format.
 
         Raises:
-            ValueError: If `send_to_llm` is True but either observation or
+            ValueError: If `send_to_llm` is `True` but either observation or
                 `llm_output` are not provided.
         """
         if isinstance(error, str):
@@ -66,11 +68,11 @@ class ErrorCode(Enum):
     """Error codes."""
 
     INVALID_PROMPT_INPUT = "INVALID_PROMPT_INPUT"
-    INVALID_TOOL_RESULTS = "INVALID_TOOL_RESULTS"
+    INVALID_TOOL_RESULTS = "INVALID_TOOL_RESULTS"  # Used in JS; not Py (yet)
     MESSAGE_COERCION_FAILURE = "MESSAGE_COERCION_FAILURE"
-    MODEL_AUTHENTICATION = "MODEL_AUTHENTICATION"
-    MODEL_NOT_FOUND = "MODEL_NOT_FOUND"
-    MODEL_RATE_LIMIT = "MODEL_RATE_LIMIT"
+    MODEL_AUTHENTICATION = "MODEL_AUTHENTICATION"  # Used in JS; not Py (yet)
+    MODEL_NOT_FOUND = "MODEL_NOT_FOUND"  # Used in JS; not Py (yet)
+    MODEL_RATE_LIMIT = "MODEL_RATE_LIMIT"  # Used in JS; not Py (yet)
     OUTPUT_PARSING_FAILURE = "OUTPUT_PARSING_FAILURE"
 
 
@@ -86,6 +88,6 @@ def create_message(*, message: str, error_code: ErrorCode) -> str:
     """
     return (
         f"{message}\n"
-        "For troubleshooting, visit: https://python.langchain.com/docs/"
-        f"troubleshooting/errors/{error_code.value} "
+        "For troubleshooting, visit: https://docs.langchain.com/oss/python/langchain"
+        f"/errors/{error_code.value} "
     )

libs/core/langchain_core/indexing/__init__.py

@@ -1,7 +1,7 @@
 """Code to help indexing data into a vectorstore.
 
 This package contains helper logic to help deal with indexing data into
-a vectorstore while avoiding duplicated content and over-writing content
+a `VectorStore` while avoiding duplicated content and over-writing content
 if it's unchanged.
 """
 

libs/core/langchain_core/indexing/api.py

@@ -6,16 +6,9 @@ import hashlib
 import json
 import uuid
 import warnings
-from collections.abc import (
-    AsyncIterable,
-    AsyncIterator,
-    Callable,
-    Iterable,
-    Iterator,
-    Sequence,
-)
 from itertools import islice
 from typing import (
+    TYPE_CHECKING,
     Any,
     Literal,
     TypedDict,
@@ -29,6 +22,16 @@ from langchain_core.exceptions import LangChainException
 from langchain_core.indexing.base import DocumentIndex, RecordManager
 from langchain_core.vectorstores import VectorStore
 
+if TYPE_CHECKING:
+    from collections.abc import (
+        AsyncIterable,
+        AsyncIterator,
+        Callable,
+        Iterable,
+        Iterator,
+        Sequence,
+    )
+
 # Magic UUID to use as a namespace for hashing.
 # Used to try and generate a unique UUID for each document
 # from hashing the document content and metadata.
@@ -298,48 +301,48 @@ def index(
     For the time being, documents are indexed using their hashes, and users
     are not able to specify the uid of the document.
 
-    !!! warning "Behavior changed in 0.3.25"
+    !!! warning "Behavior changed in `langchain-core` 0.3.25"
         Added `scoped_full` cleanup mode.
 
     !!! warning
 
         * In full mode, the loader should be returning
-          the entire dataset, and not just a subset of the dataset.
-          Otherwise, the auto_cleanup will remove documents that it is not
-          supposed to.
+            the entire dataset, and not just a subset of the dataset.
+            Otherwise, the auto_cleanup will remove documents that it is not
+            supposed to.
         * In incremental mode, if documents associated with a particular
-          source id appear across different batches, the indexing API
-          will do some redundant work. This will still result in the
-          correct end state of the index, but will unfortunately not be
-          100% efficient. For example, if a given document is split into 15
-          chunks, and we index them using a batch size of 5, we'll have 3 batches
-          all with the same source id. In general, to avoid doing too much
-          redundant work select as big a batch size as possible.
+            source id appear across different batches, the indexing API
+            will do some redundant work. This will still result in the
+            correct end state of the index, but will unfortunately not be
+            100% efficient. For example, if a given document is split into 15
+            chunks, and we index them using a batch size of 5, we'll have 3 batches
+            all with the same source id. In general, to avoid doing too much
+            redundant work select as big a batch size as possible.
         * The `scoped_full` mode is suitable if determining an appropriate batch size
-          is challenging or if your data loader cannot return the entire dataset at
-          once. This mode keeps track of source IDs in memory, which should be fine
-          for most use cases. If your dataset is large (10M+ docs), you will likely
-          need to parallelize the indexing process regardless.
+            is challenging or if your data loader cannot return the entire dataset at
+            once. This mode keeps track of source IDs in memory, which should be fine
+            for most use cases. If your dataset is large (10M+ docs), you will likely
+            need to parallelize the indexing process regardless.
 
     Args:
         docs_source: Data loader or iterable of documents to index.
         record_manager: Timestamped set to keep track of which documents were
             updated.
-        vector_store: VectorStore or DocumentIndex to index the documents into.
+        vector_store: `VectorStore` or DocumentIndex to index the documents into.
         batch_size: Batch size to use when indexing.
         cleanup: How to handle clean up of documents.
 
             - incremental: Cleans up all documents that haven't been updated AND
-              that are associated with source ids that were seen during indexing.
-              Clean up is done continuously during indexing helping to minimize the
-              probability of users seeing duplicated content.
+                that are associated with source IDs that were seen during indexing.
+                Clean up is done continuously during indexing helping to minimize the
+                probability of users seeing duplicated content.
             - full: Delete all documents that have not been returned by the loader
-              during this run of indexing.
-              Clean up runs after all documents have been indexed.
-              This means that users may see duplicated content during indexing.
+                during this run of indexing.
+                Clean up runs after all documents have been indexed.
+                This means that users may see duplicated content during indexing.
             - scoped_full: Similar to Full, but only deletes all documents
-              that haven't been updated AND that are associated with
-              source ids that were seen during indexing.
+                that haven't been updated AND that are associated with
+                source IDs that were seen during indexing.
             - None: Do not delete any documents.
         source_id_key: Optional key that helps identify the original source
             of the document.
@@ -349,7 +352,7 @@ def index(
         key_encoder: Hashing algorithm to use for hashing the document content and
             metadata. Options include "blake2b", "sha256", and "sha512".
 
-            !!! version-added "Added in version 0.3.66"
+            !!! version-added "Added in `langchain-core` 0.3.66"
 
         key_encoder: Hashing algorithm to use for hashing the document.
             If not provided, a default encoder using SHA-1 will be used.
@@ -363,10 +366,10 @@ def index(
             When changing the key encoder, you must change the
             index as well to avoid duplicated documents in the cache.
         upsert_kwargs: Additional keyword arguments to pass to the add_documents
-            method of the VectorStore or the upsert method of the DocumentIndex.
+            method of the `VectorStore` or the upsert method of the DocumentIndex.
             For example, you can use this to specify a custom vector_field:
             upsert_kwargs={"vector_field": "embedding"}
-            !!! version-added "Added in version 0.3.10"
+            !!! version-added "Added in `langchain-core` 0.3.10"
 
     Returns:
         Indexing result which contains information about how many documents
@@ -375,10 +378,10 @@ def index(
     Raises:
         ValueError: If cleanup mode is not one of 'incremental', 'full' or None
         ValueError: If cleanup mode is incremental and source_id_key is None.
-        ValueError: If vectorstore does not have
+        ValueError: If `VectorStore` does not have
             "delete" and "add_documents" required methods.
         ValueError: If source_id_key is not None, but is not a string or callable.
-        TypeError: If `vectorstore` is not a VectorStore or a DocumentIndex.
+        TypeError: If `vectorstore` is not a `VectorStore` or a DocumentIndex.
         AssertionError: If `source_id` is None when cleanup mode is incremental.
             (should be unreachable code).
     """
@@ -415,7 +418,7 @@ def index(
                 raise ValueError(msg)
 
         if type(destination).delete == VectorStore.delete:
-            # Checking if the vectorstore has overridden the default delete method
+            # Checking if the VectorStore has overridden the default delete method
             # implementation which just raises a NotImplementedError
             msg = "Vectorstore has not implemented the delete method"
             raise ValueError(msg)
@@ -466,11 +469,11 @@ def index(
         ]
 
         if cleanup in {"incremental", "scoped_full"}:
-            # source ids are required.
+            # Source IDs are required.
             for source_id, hashed_doc in zip(source_ids, hashed_docs, strict=False):
                 if source_id is None:
                     msg = (
-                        f"Source ids are required when cleanup mode is "
+                        f"Source IDs are required when cleanup mode is "
                         f"incremental or scoped_full. "
                         f"Document that starts with "
                         f"content: {hashed_doc.page_content[:100]} "
@@ -479,7 +482,7 @@ def index(
                     raise ValueError(msg)
                 if cleanup == "scoped_full":
                     scoped_full_cleanup_source_ids.add(source_id)
-            # source ids cannot be None after for loop above.
+            # Source IDs cannot be None after for loop above.
             source_ids = cast("Sequence[str]", source_ids)
 
         exists_batch = record_manager.exists(
@@ -538,7 +541,7 @@ def index(
         # If source IDs are provided, we can do the deletion incrementally!
         if cleanup == "incremental":
             # Get the uids of the documents that were not returned by the loader.
-            # mypy isn't good enough to determine that source ids cannot be None
+            # mypy isn't good enough to determine that source IDs cannot be None
             # here due to a check that's happening above, so we check again.
             for source_id in source_ids:
                 if source_id is None:
@@ -636,48 +639,48 @@ async def aindex(
     For the time being, documents are indexed using their hashes, and users
     are not able to specify the uid of the document.
 
-    !!! warning "Behavior changed in 0.3.25"
+    !!! warning "Behavior changed in `langchain-core` 0.3.25"
         Added `scoped_full` cleanup mode.
 
     !!! warning
 
         * In full mode, the loader should be returning
-          the entire dataset, and not just a subset of the dataset.
-          Otherwise, the auto_cleanup will remove documents that it is not
-          supposed to.
+            the entire dataset, and not just a subset of the dataset.
+            Otherwise, the auto_cleanup will remove documents that it is not
+            supposed to.
         * In incremental mode, if documents associated with a particular
-          source id appear across different batches, the indexing API
-          will do some redundant work. This will still result in the
-          correct end state of the index, but will unfortunately not be
-          100% efficient. For example, if a given document is split into 15
-          chunks, and we index them using a batch size of 5, we'll have 3 batches
-          all with the same source id. In general, to avoid doing too much
-          redundant work select as big a batch size as possible.
+            source id appear across different batches, the indexing API
+            will do some redundant work. This will still result in the
+            correct end state of the index, but will unfortunately not be
+            100% efficient. For example, if a given document is split into 15
+            chunks, and we index them using a batch size of 5, we'll have 3 batches
+            all with the same source id. In general, to avoid doing too much
+            redundant work select as big a batch size as possible.
         * The `scoped_full` mode is suitable if determining an appropriate batch size
-          is challenging or if your data loader cannot return the entire dataset at
-          once. This mode keeps track of source IDs in memory, which should be fine
-          for most use cases. If your dataset is large (10M+ docs), you will likely
-          need to parallelize the indexing process regardless.
+            is challenging or if your data loader cannot return the entire dataset at
+            once. This mode keeps track of source IDs in memory, which should be fine
+            for most use cases. If your dataset is large (10M+ docs), you will likely
+            need to parallelize the indexing process regardless.
 
     Args:
         docs_source: Data loader or iterable of documents to index.
         record_manager: Timestamped set to keep track of which documents were
             updated.
-        vector_store: VectorStore or DocumentIndex to index the documents into.
+        vector_store: `VectorStore` or DocumentIndex to index the documents into.
         batch_size: Batch size to use when indexing.
         cleanup: How to handle clean up of documents.
 
             - incremental: Cleans up all documents that haven't been updated AND
-              that are associated with source ids that were seen during indexing.
-              Clean up is done continuously during indexing helping to minimize the
-              probability of users seeing duplicated content.
+                that are associated with source IDs that were seen during indexing.
+                Clean up is done continuously during indexing helping to minimize the
+                probability of users seeing duplicated content.
             - full: Delete all documents that have not been returned by the loader
-              during this run of indexing.
-              Clean up runs after all documents have been indexed.
-              This means that users may see duplicated content during indexing.
+                during this run of indexing.
+                Clean up runs after all documents have been indexed.
+                This means that users may see duplicated content during indexing.
             - scoped_full: Similar to Full, but only deletes all documents
-              that haven't been updated AND that are associated with
-              source ids that were seen during indexing.
+                that haven't been updated AND that are associated with
+                source IDs that were seen during indexing.
             - None: Do not delete any documents.
         source_id_key: Optional key that helps identify the original source
             of the document.
@@ -687,7 +690,7 @@ async def aindex(
         key_encoder: Hashing algorithm to use for hashing the document content and
             metadata. Options include "blake2b", "sha256", and "sha512".
 
-            !!! version-added "Added in version 0.3.66"
+            !!! version-added "Added in `langchain-core` 0.3.66"
 
         key_encoder: Hashing algorithm to use for hashing the document.
             If not provided, a default encoder using SHA-1 will be used.
@@ -701,10 +704,10 @@ async def aindex(
             When changing the key encoder, you must change the
             index as well to avoid duplicated documents in the cache.
         upsert_kwargs: Additional keyword arguments to pass to the add_documents
-            method of the VectorStore or the upsert method of the DocumentIndex.
+            method of the `VectorStore` or the upsert method of the DocumentIndex.
             For example, you can use this to specify a custom vector_field:
             upsert_kwargs={"vector_field": "embedding"}
-            !!! version-added "Added in version 0.3.10"
+            !!! version-added "Added in `langchain-core` 0.3.10"
 
     Returns:
         Indexing result which contains information about how many documents
@@ -713,10 +716,10 @@ async def aindex(
     Raises:
         ValueError: If cleanup mode is not one of 'incremental', 'full' or None
         ValueError: If cleanup mode is incremental and source_id_key is None.
-        ValueError: If vectorstore does not have
+        ValueError: If `VectorStore` does not have
             "adelete" and "aadd_documents" required methods.
         ValueError: If source_id_key is not None, but is not a string or callable.
-        TypeError: If `vector_store` is not a VectorStore or DocumentIndex.
+        TypeError: If `vector_store` is not a `VectorStore` or DocumentIndex.
         AssertionError: If `source_id_key` is None when cleanup mode is
             incremental or `scoped_full` (should be unreachable).
     """
@@ -757,7 +760,7 @@ async def aindex(
             type(destination).adelete == VectorStore.adelete
             and type(destination).delete == VectorStore.delete
         ):
-            # Checking if the vectorstore has overridden the default adelete or delete
+            # Checking if the VectorStore has overridden the default adelete or delete
             # methods implementation which just raises a NotImplementedError
             msg = "Vectorstore has not implemented the adelete or delete method"
             raise ValueError(msg)
@@ -815,11 +818,11 @@ async def aindex(
         ]
 
         if cleanup in {"incremental", "scoped_full"}:
-            # If the cleanup mode is incremental, source ids are required.
+            # If the cleanup mode is incremental, source IDs are required.
             for source_id, hashed_doc in zip(source_ids, hashed_docs, strict=False):
                 if source_id is None:
                     msg = (
-                        f"Source ids are required when cleanup mode is "
+                        f"Source IDs are required when cleanup mode is "
                         f"incremental or scoped_full. "
                         f"Document that starts with "
                         f"content: {hashed_doc.page_content[:100]} "
@@ -828,7 +831,7 @@ async def aindex(
                     raise ValueError(msg)
                 if cleanup == "scoped_full":
                     scoped_full_cleanup_source_ids.add(source_id)
-            # source ids cannot be None after for loop above.
+            # Source IDs cannot be None after for loop above.
             source_ids = cast("Sequence[str]", source_ids)
 
         exists_batch = await record_manager.aexists(
@@ -888,7 +891,7 @@ async def aindex(
         if cleanup == "incremental":
             # Get the uids of the documents that were not returned by the loader.
 
-            # mypy isn't good enough to determine that source ids cannot be None
+            # mypy isn't good enough to determine that source IDs cannot be None
             # here due to a check that's happening above, so we check again.
             for source_id in source_ids:
                 if source_id is None:

libs/core/langchain_core/indexing/base.py

@@ -25,7 +25,7 @@ class RecordManager(ABC):
     The record manager abstraction is used by the langchain indexing API.
 
     The record manager keeps track of which documents have been
-    written into a vectorstore and when they were written.
+    written into a `VectorStore` and when they were written.
 
     The indexing API computes hashes for each document and stores the hash
     together with the write time and the source id in the record manager.
@@ -37,7 +37,7 @@ class RecordManager(ABC):
     already been indexed, and to only index new documents.
 
     The main benefit of this abstraction is that it works across many vectorstores.
-    To be supported, a vectorstore needs to only support the ability to add and
+    To be supported, a `VectorStore` needs to only support the ability to add and
     delete documents by ID. Using the record manager, the indexing API will
     be able to delete outdated documents and avoid redundant indexing of documents
     that have already been indexed.
@@ -45,13 +45,13 @@ class RecordManager(ABC):
     The main constraints of this abstraction are:
 
     1. It relies on the time-stamps to determine which documents have been
-       indexed and which have not. This means that the time-stamps must be
-       monotonically increasing. The timestamp should be the timestamp
-       as measured by the server to minimize issues.
+        indexed and which have not. This means that the time-stamps must be
+        monotonically increasing. The timestamp should be the timestamp
+        as measured by the server to minimize issues.
     2. The record manager is currently implemented separately from the
-       vectorstore, which means that the overall system becomes distributed
-       and may create issues with consistency. For example, writing to
-       record manager succeeds, but corresponding writing to vectorstore fails.
+        vectorstore, which means that the overall system becomes distributed
+        and may create issues with consistency. For example, writing to
+        record manager succeeds, but corresponding writing to `VectorStore` fails.
     """
 
     def __init__(
@@ -460,7 +460,7 @@ class UpsertResponse(TypedDict):
 class DeleteResponse(TypedDict, total=False):
     """A generic response for delete operation.
 
-    The fields in this response are optional and whether the vectorstore
+    The fields in this response are optional and whether the `VectorStore`
     returns them or not is up to the implementation.
     """
 
@@ -508,8 +508,6 @@ class DocumentIndex(BaseRetriever):
     1. Storing document in the index.
     2. Fetching document by ID.
     3. Searching for document using a query.
-
-    !!! version-added "Added in version 0.2.29"
     """
 
     @abc.abstractmethod
@@ -520,7 +518,7 @@ class DocumentIndex(BaseRetriever):
         if it is provided. If the ID is not provided, the upsert method is free
         to generate an ID for the content.
 
-        When an ID is specified and the content already exists in the vectorstore,
+        When an ID is specified and the content already exists in the `VectorStore`,
         the upsert method should update the content with the new data. If the content
         does not exist, the upsert method should add the item to the `VectorStore`.
 
@@ -530,20 +528,20 @@ class DocumentIndex(BaseRetriever):
 
         Returns:
             A response object that contains the list of IDs that were
-            successfully added or updated in the vectorstore and the list of IDs that
+            successfully added or updated in the `VectorStore` and the list of IDs that
             failed to be added or updated.
         """
 
     async def aupsert(
         self, items: Sequence[Document], /, **kwargs: Any
     ) -> UpsertResponse:
-        """Add or update documents in the vectorstore. Async version of upsert.
+        """Add or update documents in the `VectorStore`. Async version of `upsert`.
 
         The upsert functionality should utilize the ID field of the item
         if it is provided. If the ID is not provided, the upsert method is free
         to generate an ID for the item.
 
-        When an ID is specified and the item already exists in the vectorstore,
+        When an ID is specified and the item already exists in the `VectorStore`,
         the upsert method should update the item with the new data. If the item
         does not exist, the upsert method should add the item to the `VectorStore`.
 
@@ -553,7 +551,7 @@ class DocumentIndex(BaseRetriever):
 
         Returns:
             A response object that contains the list of IDs that were
-            successfully added or updated in the vectorstore and the list of IDs that
+            successfully added or updated in the `VectorStore` and the list of IDs that
             failed to be added or updated.
         """
         return await run_in_executor(
@@ -570,7 +568,7 @@ class DocumentIndex(BaseRetriever):
         Calling delete without any input parameters should raise a ValueError!
 
         Args:
-            ids: List of ids to delete.
+            ids: List of IDs to delete.
             **kwargs: Additional keyword arguments. This is up to the implementation.
                 For example, can include an option to delete the entire index,
                 or else issue a non-blocking delete etc.
@@ -588,7 +586,7 @@ class DocumentIndex(BaseRetriever):
         Calling adelete without any input parameters should raise a ValueError!
 
         Args:
-            ids: List of ids to delete.
+            ids: List of IDs to delete.
             **kwargs: Additional keyword arguments. This is up to the implementation.
                 For example, can include an option to delete the entire index.
 

libs/core/langchain_core/indexing/in_memory.py

@@ -23,8 +23,6 @@ class InMemoryDocumentIndex(DocumentIndex):
 
     It provides a simple search API that returns documents by the number of
     counts the given query appears in the document.
-
-    !!! version-added "Added in version 0.2.29"
     """
 
     store: dict[str, Document] = Field(default_factory=dict)
@@ -64,10 +62,10 @@ class InMemoryDocumentIndex(DocumentIndex):
         """Delete by IDs.
 
         Args:
-            ids: List of ids to delete.
+            ids: List of IDs to delete.
 
         Raises:
-            ValueError: If ids is None.
+            ValueError: If IDs is None.
 
         Returns:
             A response object that contains the list of IDs that were successfully

libs/core/langchain_core/language_models/__init__.py

@@ -6,12 +6,13 @@ LangChain has two main classes to work with language models: chat models and
 **Chat models**
 
 Language models that use a sequence of messages as inputs and return chat messages
-as outputs (as opposed to using plain text). Chat models support the assignment of
-distinct roles to conversation messages, helping to distinguish messages from the AI,
-users, and instructions such as system messages.
+as outputs (as opposed to using plain text).
 
-The key abstraction for chat models is `BaseChatModel`. Implementations
-should inherit from this class.
+Chat models support the assignment of distinct roles to conversation messages, helping
+to distinguish messages from the AI, users, and instructions such as system messages.
+
+The key abstraction for chat models is `BaseChatModel`. Implementations should inherit
+from this class.
 
 See existing [chat model integrations](https://docs.langchain.com/oss/python/integrations/chat).
 

libs/core/langchain_core/language_models/_utils.py

@@ -139,7 +139,7 @@ def _normalize_messages(
             directly; this may change in the future
     - LangChain v0 standard content blocks for backward compatibility
 
-    !!! warning "Behavior changed in 1.0.0"
+    !!! warning "Behavior changed in `langchain-core` 1.0.0"
         In previous versions, this function returned messages in LangChain v0 format.
         Now, it returns messages in LangChain v1 format, which upgraded chat models now
         expect to receive when passing back in message history. For backward

libs/core/langchain_core/language_models/base.py

@@ -131,14 +131,19 @@ class BaseLanguageModel(
 
     Caching is not currently supported for streaming methods of models.
     """
+
     verbose: bool = Field(default_factory=_get_verbosity, exclude=True, repr=False)
     """Whether to print out response text."""
+
     callbacks: Callbacks = Field(default=None, exclude=True)
     """Callbacks to add to the run trace."""
+
     tags: list[str] | None = Field(default=None, exclude=True)
     """Tags to add to the run trace."""
+
     metadata: dict[str, Any] | None = Field(default=None, exclude=True)
     """Metadata to add to the run trace."""
+
     custom_get_token_ids: Callable[[str], list[int]] | None = Field(
         default=None, exclude=True
     )
@@ -195,15 +200,22 @@ class BaseLanguageModel(
             type (e.g., pure text completion models vs chat models).
 
         Args:
-            prompts: List of `PromptValue` objects. A `PromptValue` is an object that
-                can be converted to match the format of any language model (string for
-                pure text generation models and `BaseMessage` objects for chat models).
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of these substrings.
-            callbacks: `Callbacks` to pass through. Used for executing additional
-                functionality, such as logging or streaming, throughout generation.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            prompts: List of `PromptValue` objects.
+
+                A `PromptValue` is an object that can be converted to match the format
+                of any language model (string for pure text generation models and
+                `BaseMessage` objects for chat models).
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+            callbacks: `Callbacks` to pass through.
+
+                Used for executing additional functionality, such as logging or
+                streaming, throughout generation.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Returns:
             An `LLMResult`, which contains a list of candidate `Generation` objects for
@@ -232,15 +244,22 @@ class BaseLanguageModel(
             type (e.g., pure text completion models vs chat models).
 
         Args:
-            prompts: List of `PromptValue` objects. A `PromptValue` is an object that
-                can be converted to match the format of any language model (string for
-                pure text generation models and `BaseMessage` objects for chat models).
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of these substrings.
-            callbacks: `Callbacks` to pass through. Used for executing additional
-                functionality, such as logging or streaming, throughout generation.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            prompts: List of `PromptValue` objects.
+
+                A `PromptValue` is an object that can be converted to match the format
+                of any language model (string for pure text generation models and
+                `BaseMessage` objects for chat models).
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+            callbacks: `Callbacks` to pass through.
+
+                Used for executing additional functionality, such as logging or
+                streaming, throughout generation.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Returns:
             An `LLMResult`, which contains a list of candidate `Generation` objects for
@@ -262,13 +281,13 @@ class BaseLanguageModel(
         return self.lc_attributes
 
     def get_token_ids(self, text: str) -> list[int]:
-        """Return the ordered ids of the tokens in a text.
+        """Return the ordered IDs of the tokens in a text.
 
         Args:
             text: The string input to tokenize.
 
         Returns:
-            A list of ids corresponding to the tokens in the text, in order they occur
+            A list of IDs corresponding to the tokens in the text, in order they occur
                 in the text.
         """
         if self.custom_get_token_ids is not None:
@@ -280,6 +299,9 @@ class BaseLanguageModel(
 
         Useful for checking if an input fits in a model's context window.
 
+        This should be overridden by model-specific implementations to provide accurate
+        token counts via model-specific tokenizers.
+
         Args:
             text: The string input to tokenize.
 
@@ -298,9 +320,17 @@ class BaseLanguageModel(
 
         Useful for checking if an input fits in a model's context window.
 
+        This should be overridden by model-specific implementations to provide accurate
+        token counts via model-specific tokenizers.
+
         !!! note
-            The base implementation of `get_num_tokens_from_messages` ignores tool
-            schemas.
+
+            * The base implementation of `get_num_tokens_from_messages` ignores tool
+                schemas.
+            * The base implementation of `get_num_tokens_from_messages` adds additional
+                prefixes to messages in represent user roles, which will add to the
+                overall token count. Model-specific implementations may choose to
+                handle this differently.
 
         Args:
             messages: The message inputs to tokenize.

libs/core/langchain_core/language_models/chat_models.py

@@ -15,6 +15,7 @@ from typing import TYPE_CHECKING, Any, Literal, cast
 from pydantic import BaseModel, ConfigDict, Field
 from typing_extensions import override
 
+from langchain_core._api.beta_decorator import beta
 from langchain_core.caches import BaseCache
 from langchain_core.callbacks import (
     AsyncCallbackManager,
@@ -75,6 +76,8 @@ from langchain_core.utils.utils import LC_ID_PREFIX, from_env
 if TYPE_CHECKING:
     import uuid
 
+    from langchain_model_profiles import ModelProfile  # type: ignore[import-untyped]
+
     from langchain_core.output_parsers.base import OutputParserLike
     from langchain_core.runnables import Runnable, RunnableConfig
     from langchain_core.tools import BaseTool
@@ -88,7 +91,10 @@ def _generate_response_from_error(error: BaseException) -> list[ChatGeneration]:
             try:
                 metadata["body"] = response.json()
             except Exception:
-                metadata["body"] = getattr(response, "text", None)
+                try:
+                    metadata["body"] = getattr(response, "text", None)
+                except Exception:
+                    metadata["body"] = None
         if hasattr(response, "headers"):
             try:
                 metadata["headers"] = dict(response.headers)
@@ -329,7 +335,7 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
     [`langchain-openai`](https://pypi.org/project/langchain-openai)) can also use this
     field to roll out new content formats in a backward-compatible way.
 
-    !!! version-added "Added in version 1.0"
+    !!! version-added "Added in `langchain-core` 1.0"
 
     """
 
@@ -842,16 +848,21 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
 
         Args:
             messages: List of list of messages.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of these substrings.
-            callbacks: `Callbacks` to pass through. Used for executing additional
-                functionality, such as logging or streaming, throughout generation.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+            callbacks: `Callbacks` to pass through.
+
+                Used for executing additional functionality, such as logging or
+                streaming, throughout generation.
             tags: The tags to apply.
             metadata: The metadata to apply.
             run_name: The name of the run.
             run_id: The ID of the run.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Returns:
             An `LLMResult`, which contains a list of candidate `Generations` for each
@@ -960,16 +971,21 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
 
         Args:
             messages: List of list of messages.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of these substrings.
-            callbacks: `Callbacks` to pass through. Used for executing additional
-                functionality, such as logging or streaming, throughout generation.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+            callbacks: `Callbacks` to pass through.
+
+                Used for executing additional functionality, such as logging or
+                streaming, throughout generation.
             tags: The tags to apply.
             metadata: The metadata to apply.
             run_name: The name of the run.
             run_id: The ID of the run.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Returns:
             An `LLMResult`, which contains a list of candidate `Generations` for each
@@ -1502,10 +1518,10 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
         Args:
             schema: The output schema. Can be passed in as:
 
-                - an OpenAI function/tool schema,
-                - a JSON Schema,
-                - a `TypedDict` class,
-                - or a Pydantic class.
+                - An OpenAI function/tool schema,
+                - A JSON Schema,
+                - A `TypedDict` class,
+                - Or a Pydantic class.
 
                 If `schema` is a Pydantic class then the model output will be a
                 Pydantic instance of that class, and the model-generated fields will be
@@ -1517,11 +1533,15 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
                 when specifying a Pydantic or `TypedDict` class.
 
             include_raw:
-                If `False` then only the parsed structured output is returned. If
-                an error occurs during model output parsing it will be raised. If `True`
-                then both the raw model response (a `BaseMessage`) and the parsed model
-                response will be returned. If an error occurs during output parsing it
-                will be caught and returned as well.
+                If `False` then only the parsed structured output is returned.
+
+                If an error occurs during model output parsing it will be raised.
+
+                If `True` then both the raw model response (a `BaseMessage`) and the
+                parsed model response will be returned.
+
+                If an error occurs during output parsing it will be caught and returned
+                as well.
 
                 The final output is always a `dict` with keys `'raw'`, `'parsed'`, and
                 `'parsing_error'`.
@@ -1626,8 +1646,8 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
         # }
         ```
 
-        !!! warning "Behavior changed in 0.2.26"
-            Added support for TypedDict class.
+        !!! warning "Behavior changed in `langchain-core` 0.2.26"
+            Added support for `TypedDict` class.
 
         """  # noqa: E501
         _ = kwargs.pop("method", None)
@@ -1668,6 +1688,40 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
             return RunnableMap(raw=llm) | parser_with_fallback
         return llm | output_parser
 
+    @property
+    @beta()
+    def profile(self) -> ModelProfile:
+        """Return profiling information for the model.
+
+        This property relies on the `langchain-model-profiles` package to retrieve chat
+        model capabilities, such as context window sizes and supported features.
+
+        Raises:
+            ImportError: If `langchain-model-profiles` is not installed.
+
+        Returns:
+            A `ModelProfile` object containing profiling information for the model.
+        """
+        try:
+            from langchain_model_profiles import get_model_profile  # noqa: PLC0415
+        except ImportError as err:
+            informative_error_message = (
+                "To access model profiling information, please install the "
+                "`langchain-model-profiles` package: "
+                "`pip install langchain-model-profiles`."
+            )
+            raise ImportError(informative_error_message) from err
+
+        provider_id = self._llm_type
+        model_name = (
+            # Model name is not standardized across integrations. New integrations
+            # should prefer `model`.
+            getattr(self, "model", None)
+            or getattr(self, "model_name", None)
+            or getattr(self, "model_id", "")
+        )
+        return get_model_profile(provider_id, model_name) or {}
+
 
 class SimpleChatModel(BaseChatModel):
     """Simplified implementation for a chat model to inherit from.
@@ -1726,9 +1780,12 @@ def _gen_info_and_msg_metadata(
     }
 
 
+_MAX_CLEANUP_DEPTH = 100
+
+
 def _cleanup_llm_representation(serialized: Any, depth: int) -> None:
     """Remove non-serializable objects from a serialized object."""
-    if depth > 100:  # Don't cooperate for pathological cases
+    if depth > _MAX_CLEANUP_DEPTH:  # Don't cooperate for pathological cases
         return
 
     if not isinstance(serialized, dict):

libs/core/langchain_core/language_models/fake_chat_models.py

@@ -1,4 +1,4 @@
-"""Fake chat model for testing purposes."""
+"""Fake chat models for testing purposes."""
 
 import asyncio
 import re

libs/core/langchain_core/language_models/llms.py

@@ -1,4 +1,7 @@
-"""Base interface for large language models to expose."""
+"""Base interface for traditional large language models (LLMs) to expose.
+
+These are traditionally older models (newer models generally are chat models).
+"""
 
 from __future__ import annotations
 
@@ -648,9 +651,12 @@ class BaseLLM(BaseLanguageModel[str], ABC):
 
         Args:
             prompts: The prompts to generate from.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of the stop substrings.
-                If stop tokens are not supported consider raising NotImplementedError.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+
+                If stop tokens are not supported consider raising `NotImplementedError`.
             run_manager: Callback manager for the run.
 
         Returns:
@@ -668,9 +674,12 @@ class BaseLLM(BaseLanguageModel[str], ABC):
 
         Args:
             prompts: The prompts to generate from.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of the stop substrings.
-                If stop tokens are not supported consider raising NotImplementedError.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+
+                If stop tokens are not supported consider raising `NotImplementedError`.
             run_manager: Callback manager for the run.
 
         Returns:
@@ -702,11 +711,14 @@ class BaseLLM(BaseLanguageModel[str], ABC):
 
         Args:
             prompt: The prompt to generate from.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of these substrings.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
             run_manager: Callback manager for the run.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Yields:
             Generation chunks.
@@ -728,11 +740,14 @@ class BaseLLM(BaseLanguageModel[str], ABC):
 
         Args:
             prompt: The prompt to generate from.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of these substrings.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
             run_manager: Callback manager for the run.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Yields:
             Generation chunks.
@@ -843,10 +858,14 @@ class BaseLLM(BaseLanguageModel[str], ABC):
 
         Args:
             prompts: List of string prompts.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of these substrings.
-            callbacks: `Callbacks` to pass through. Used for executing additional
-                functionality, such as logging or streaming, throughout generation.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+            callbacks: `Callbacks` to pass through.
+
+                Used for executing additional functionality, such as logging or
+                streaming, throughout generation.
             tags: List of tags to associate with each prompt. If provided, the length
                 of the list must match the length of the prompts list.
             metadata: List of metadata dictionaries to associate with each prompt. If
@@ -856,8 +875,9 @@ class BaseLLM(BaseLanguageModel[str], ABC):
                 length of the list must match the length of the prompts list.
             run_id: List of run IDs to associate with each prompt. If provided, the
                 length of the list must match the length of the prompts list.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Raises:
             ValueError: If prompts is not a list.
@@ -1113,10 +1133,14 @@ class BaseLLM(BaseLanguageModel[str], ABC):
 
         Args:
             prompts: List of string prompts.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of these substrings.
-            callbacks: `Callbacks` to pass through. Used for executing additional
-                functionality, such as logging or streaming, throughout generation.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+            callbacks: `Callbacks` to pass through.
+
+                Used for executing additional functionality, such as logging or
+                streaming, throughout generation.
             tags: List of tags to associate with each prompt. If provided, the length
                 of the list must match the length of the prompts list.
             metadata: List of metadata dictionaries to associate with each prompt. If
@@ -1126,8 +1150,9 @@ class BaseLLM(BaseLanguageModel[str], ABC):
                 length of the list must match the length of the prompts list.
             run_id: List of run IDs to associate with each prompt. If provided, the
                 length of the list must match the length of the prompts list.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Raises:
             ValueError: If the length of `callbacks`, `tags`, `metadata`, or
@@ -1391,11 +1416,6 @@ class LLM(BaseLLM):
         `astream` will use `_astream` if provided, otherwise it will implement
         a fallback behavior that will use `_stream` if `_stream` is implemented,
         and use `_acall` if `_stream` is not implemented.
-
-    Please see the following guide for more information on how to
-    implement a custom LLM:
-
-    https://python.langchain.com/docs/how_to/custom_llm/
     """
 
     @abstractmethod
@@ -1412,12 +1432,16 @@ class LLM(BaseLLM):
 
         Args:
             prompt: The prompt to generate from.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of the stop substrings.
-                If stop tokens are not supported consider raising NotImplementedError.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+
+                If stop tokens are not supported consider raising `NotImplementedError`.
             run_manager: Callback manager for the run.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Returns:
             The model output as a string. SHOULD NOT include the prompt.
@@ -1438,12 +1462,16 @@ class LLM(BaseLLM):
 
         Args:
             prompt: The prompt to generate from.
-            stop: Stop words to use when generating. Model output is cut off at the
-                first occurrence of any of the stop substrings.
-                If stop tokens are not supported consider raising NotImplementedError.
+            stop: Stop words to use when generating.
+
+                Model output is cut off at the first occurrence of any of these
+                substrings.
+
+                If stop tokens are not supported consider raising `NotImplementedError`.
             run_manager: Callback manager for the run.
-            **kwargs: Arbitrary additional keyword arguments. These are usually passed
-                to the model provider API call.
+            **kwargs: Arbitrary additional keyword arguments.
+
+                These are usually passed to the model provider API call.
 
         Returns:
             The model output as a string. SHOULD NOT include the prompt.

libs/core/langchain_core/load/dump.py

@@ -17,7 +17,7 @@ def default(obj: Any) -> Any:
         obj: The object to serialize to json if it is a Serializable object.
 
     Returns:
-        A json serializable object or a SerializedNotImplemented object.
+        A JSON serializable object or a SerializedNotImplemented object.
     """
     if isinstance(obj, Serializable):
         return obj.to_json()
@@ -38,7 +38,7 @@ def _dump_pydantic_models(obj: Any) -> Any:
 
 
 def dumps(obj: Any, *, pretty: bool = False, **kwargs: Any) -> str:
-    """Return a json string representation of an object.
+    """Return a JSON string representation of an object.
 
     Args:
         obj: The object to dump.
@@ -47,7 +47,7 @@ def dumps(obj: Any, *, pretty: bool = False, **kwargs: Any) -> str:
         **kwargs: Additional arguments to pass to `json.dumps`
 
     Returns:
-        A json string representation of the object.
+        A JSON string representation of the object.
 
     Raises:
         ValueError: If `default` is passed as a kwarg.
@@ -71,14 +71,12 @@ def dumps(obj: Any, *, pretty: bool = False, **kwargs: Any) -> str:
 def dumpd(obj: Any) -> Any:
     """Return a dict representation of an object.
 
-    !!! note
-        Unfortunately this function is not as efficient as it could be because it first
-        dumps the object to a json string and then loads it back into a dictionary.
-
     Args:
         obj: The object to dump.
 
     Returns:
-        dictionary that can be serialized to json using json.dumps
+        Dictionary that can be serialized to json using `json.dumps`.
     """
+    # Unfortunately this function is not as efficient as it could be because it first
+    # dumps the object to a json string and then loads it back into a dictionary.
     return json.loads(dumps(obj))

libs/core/langchain_core/load/load.py

@@ -61,13 +61,15 @@ class Reviver:
         """Initialize the reviver.
 
         Args:
-            secrets_map: A map of secrets to load. If a secret is not found in
-                the map, it will be loaded from the environment if `secrets_from_env`
-                is True.
+            secrets_map: A map of secrets to load.
+
+                If a secret is not found in the map, it will be loaded from the
+                environment if `secrets_from_env` is `True`.
             valid_namespaces: A list of additional namespaces (modules)
                 to allow to be deserialized.
             secrets_from_env: Whether to load secrets from the environment.
             additional_import_mappings: A dictionary of additional namespace mappings
+
                 You can use this to override default mappings or add new mappings.
             ignore_unserializable_fields: Whether to ignore unserializable fields.
         """
@@ -195,13 +197,15 @@ def loads(
 
     Args:
         text: The string to load.
-        secrets_map: A map of secrets to load. If a secret is not found in
-            the map, it will be loaded from the environment if `secrets_from_env`
-            is True.
+        secrets_map: A map of secrets to load.
+
+            If a secret is not found in the map, it will be loaded from the environment
+            if `secrets_from_env` is `True`.
         valid_namespaces: A list of additional namespaces (modules)
             to allow to be deserialized.
         secrets_from_env: Whether to load secrets from the environment.
         additional_import_mappings: A dictionary of additional namespace mappings
+
             You can use this to override default mappings or add new mappings.
         ignore_unserializable_fields: Whether to ignore unserializable fields.
 
@@ -237,13 +241,15 @@ def load(
 
     Args:
         obj: The object to load.
-        secrets_map: A map of secrets to load. If a secret is not found in
-            the map, it will be loaded from the environment if `secrets_from_env`
-            is True.
+        secrets_map: A map of secrets to load.
+
+            If a secret is not found in the map, it will be loaded from the environment
+            if `secrets_from_env` is `True`.
         valid_namespaces: A list of additional namespaces (modules)
             to allow to be deserialized.
         secrets_from_env: Whether to load secrets from the environment.
         additional_import_mappings: A dictionary of additional namespace mappings
+
             You can use this to override default mappings or add new mappings.
         ignore_unserializable_fields: Whether to ignore unserializable fields.
 

libs/core/langchain_core/load/serializable.py

@@ -97,11 +97,14 @@ class Serializable(BaseModel, ABC):
         by default. This is to prevent accidental serialization of objects that should
         not be serialized.
     - `get_lc_namespace`: Get the namespace of the LangChain object.
+
         During deserialization, this namespace is used to identify
         the correct class to instantiate.
+
         Please see the `Reviver` class in `langchain_core.load.load` for more details.
         During deserialization an additional mapping is handle classes that have moved
         or been renamed across package versions.
+
     - `lc_secrets`: A map of constructor argument names to secret ids.
     - `lc_attributes`: List of additional attribute names that should be included
         as part of the serialized representation.
@@ -194,7 +197,7 @@ class Serializable(BaseModel, ABC):
             ValueError: If the class has deprecated attributes.
 
         Returns:
-            A json serializable object or a `SerializedNotImplemented` object.
+            A JSON serializable object or a `SerializedNotImplemented` object.
         """
         if not self.is_lc_serializable():
             return self.to_json_not_implemented()

libs/core/langchain_core/messages/__init__.py

@@ -9,6 +9,9 @@ if TYPE_CHECKING:
     from langchain_core.messages.ai import (
         AIMessage,
         AIMessageChunk,
+        InputTokenDetails,
+        OutputTokenDetails,
+        UsageMetadata,
     )
     from langchain_core.messages.base import (
         BaseMessage,
@@ -87,10 +90,12 @@ __all__ = (
     "HumanMessage",
     "HumanMessageChunk",
     "ImageContentBlock",
+    "InputTokenDetails",
     "InvalidToolCall",
     "MessageLikeRepresentation",
     "NonStandardAnnotation",
     "NonStandardContentBlock",
+    "OutputTokenDetails",
     "PlainTextContentBlock",
     "ReasoningContentBlock",
     "RemoveMessage",
@@ -104,6 +109,7 @@ __all__ = (
     "ToolCallChunk",
     "ToolMessage",
     "ToolMessageChunk",
+    "UsageMetadata",
     "VideoContentBlock",
     "_message_from_dict",
     "convert_to_messages",
@@ -145,6 +151,7 @@ _dynamic_imports = {
     "HumanMessageChunk": "human",
     "NonStandardAnnotation": "content",
     "NonStandardContentBlock": "content",
+    "OutputTokenDetails": "ai",
     "PlainTextContentBlock": "content",
     "ReasoningContentBlock": "content",
     "RemoveMessage": "modifier",
@@ -154,12 +161,14 @@ _dynamic_imports = {
     "SystemMessage": "system",
     "SystemMessageChunk": "system",
     "ImageContentBlock": "content",
+    "InputTokenDetails": "ai",
     "InvalidToolCall": "tool",
     "TextContentBlock": "content",
     "ToolCall": "tool",
     "ToolCallChunk": "tool",
     "ToolMessage": "tool",
     "ToolMessageChunk": "tool",
+    "UsageMetadata": "ai",
     "VideoContentBlock": "content",
     "AnyMessage": "utils",
     "MessageLikeRepresentation": "utils",

libs/core/langchain_core/messages/ai.py

@@ -48,10 +48,10 @@ class InputTokenDetails(TypedDict, total=False):
         }
         ```
 
-    !!! version-added "Added in version 0.3.9"
-
     May also hold extra provider-specific keys.
 
+    !!! version-added "Added in `langchain-core` 0.3.9"
+
     """
 
     audio: int
@@ -83,7 +83,9 @@ class OutputTokenDetails(TypedDict, total=False):
         }
         ```
 
-    !!! version-added "Added in version 0.3.9"
+    May also hold extra provider-specific keys.
+
+    !!! version-added "Added in `langchain-core` 0.3.9"
 
     """
 
@@ -121,9 +123,13 @@ class UsageMetadata(TypedDict):
         }
         ```
 
-    !!! warning "Behavior changed in 0.3.9"
+    !!! warning "Behavior changed in `langchain-core` 0.3.9"
         Added `input_token_details` and `output_token_details`.
 
+    !!! note "LangSmith SDK"
+        The LangSmith SDK also has a `UsageMetadata` class. While the two share fields,
+        LangSmith's `UsageMetadata` has additional fields to capture cost information
+        used by the LangSmith platform.
     """
 
     input_tokens: int
@@ -131,7 +137,7 @@ class UsageMetadata(TypedDict):
     output_tokens: int
     """Count of output (or completion) tokens. Sum of all output token types."""
     total_tokens: int
-    """Total token count. Sum of input_tokens + output_tokens."""
+    """Total token count. Sum of `input_tokens` + `output_tokens`."""
     input_token_details: NotRequired[InputTokenDetails]
     """Breakdown of input token counts.
 
@@ -141,7 +147,6 @@ class UsageMetadata(TypedDict):
     """Breakdown of output token counts.
 
     Does *not* need to sum to full output token count. Does *not* need to have all keys.
-
     """
 
 
@@ -153,7 +158,6 @@ class AIMessage(BaseMessage):
     This message represents the output of the model and consists of both
     the raw output as returned by the model and standardized fields
     (e.g., tool calls, usage metadata) added by the LangChain framework.
-
     """
 
     tool_calls: list[ToolCall] = []
@@ -651,13 +655,13 @@ def add_ai_message_chunks(
             chunk_id = id_
             break
     else:
-        # second pass: prefer lc_run-* ids over lc_* ids
+        # second pass: prefer lc_run-* IDs over lc_* IDs
         for id_ in candidates:
             if id_ and id_.startswith(LC_ID_PREFIX):
                 chunk_id = id_
                 break
         else:
-            # third pass: take any remaining id (auto-generated lc_* ids)
+            # third pass: take any remaining ID (auto-generated lc_* IDs)
             for id_ in candidates:
                 if id_:
                     chunk_id = id_

libs/core/langchain_core/messages/base.py

@@ -5,11 +5,9 @@ from __future__ import annotations
 from typing import TYPE_CHECKING, Any, cast, overload
 
 from pydantic import ConfigDict, Field
-from typing_extensions import Self
 
 from langchain_core._api.deprecation import warn_deprecated
 from langchain_core.load.serializable import Serializable
-from langchain_core.messages import content as types
 from langchain_core.utils import get_bolded_text
 from langchain_core.utils._merge import merge_dicts, merge_lists
 from langchain_core.utils.interactive_env import is_interactive_env
@@ -17,6 +15,9 @@ from langchain_core.utils.interactive_env import is_interactive_env
 if TYPE_CHECKING:
     from collections.abc import Sequence
 
+    from typing_extensions import Self
+
+    from langchain_core.messages import content as types
     from langchain_core.prompts.chat import ChatPromptTemplate
 
 
@@ -93,6 +94,10 @@ class BaseMessage(Serializable):
     """Base abstract message class.
 
     Messages are the inputs and outputs of a chat model.
+
+    Examples include [`HumanMessage`][langchain.messages.HumanMessage],
+    [`AIMessage`][langchain.messages.AIMessage], and
+    [`SystemMessage`][langchain.messages.SystemMessage].
     """
 
     content: str | list[str | dict]
@@ -195,7 +200,7 @@ class BaseMessage(Serializable):
     def content_blocks(self) -> list[types.ContentBlock]:
         r"""Load content blocks from the message content.
 
-        !!! version-added "Added in version 1.0.0"
+        !!! version-added "Added in `langchain-core` 1.0.0"
 
         """
         # Needed here to avoid circular import, as these classes import BaseMessages

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

@@ -12,10 +12,11 @@ the implementation in `BaseMessage`.
 
 from __future__ import annotations
 
-from collections.abc import Callable
 from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:
+    from collections.abc import Callable
+
     from langchain_core.messages import AIMessage, AIMessageChunk
     from langchain_core.messages import content as types
 

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

@@ -368,7 +368,7 @@ def _convert_to_v1_from_genai(message: AIMessage) -> list[types.ContentBlock]:
                     else:
                         # Assume it's raw base64 without data URI
                         try:
-                            # Validate base64 and decode for mime type detection
+                            # Validate base64 and decode for MIME type detection
                             decoded_bytes = base64.b64decode(url, validate=True)
 
                             image_url_b64_block = {
@@ -379,7 +379,7 @@ def _convert_to_v1_from_genai(message: AIMessage) -> list[types.ContentBlock]:
                             try:
                                 import filetype  # type: ignore[import-not-found] # noqa: PLC0415
 
-                                # Guess mime type based on file bytes
+                                # Guess MIME type based on file bytes
                                 mime_type = None
                                 kind = filetype.guess(decoded_bytes)
                                 if kind:
@@ -458,6 +458,8 @@ def _convert_to_v1_from_genai(message: AIMessage) -> list[types.ContentBlock]:
                 if outcome is not None:
                     server_tool_result_block["extras"]["outcome"] = outcome
                 converted_blocks.append(server_tool_result_block)
+            elif item_type == "text":
+                converted_blocks.append(cast("types.TextContentBlock", item))
             else:
                 # Unknown type, preserve as non-standard
                 converted_blocks.append({"type": "non_standard", "value": item})

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

@@ -4,7 +4,6 @@ from __future__ import annotations
 
 import json
 import warnings
-from collections.abc import Iterable
 from typing import TYPE_CHECKING, Any, Literal, cast
 
 from langchain_core.language_models._utils import (
@@ -14,6 +13,8 @@ from langchain_core.language_models._utils import (
 from langchain_core.messages import content as types
 
 if TYPE_CHECKING:
+    from collections.abc import Iterable
+
     from langchain_core.messages import AIMessage, AIMessageChunk
 
 

libs/core/langchain_core/messages/content.py

@@ -644,7 +644,7 @@ class AudioContentBlock(TypedDict):
 
 
 class PlainTextContentBlock(TypedDict):
-    """Plaintext data (e.g., from a document).
+    """Plaintext data (e.g., from a `.txt` or `.md` document).
 
     !!! note
         A `PlainTextContentBlock` existed in `langchain-core<1.0.0`. Although the
@@ -767,7 +767,7 @@ class FileContentBlock(TypedDict):
 
 
 class NonStandardContentBlock(TypedDict):
-    """Provider-specific data.
+    """Provider-specific content data.
 
     This block contains data for which there is not yet a standard type.
 
@@ -802,7 +802,7 @@ class NonStandardContentBlock(TypedDict):
     """
 
     value: dict[str, Any]
-    """Provider-specific data."""
+    """Provider-specific content data."""
 
     index: NotRequired[int | str]
     """Index of block in aggregate response. Used during streaming."""
@@ -867,7 +867,7 @@ def _get_data_content_block_types() -> tuple[str, ...]:
     Example: ("image", "video", "audio", "text-plain", "file")
 
     Note that old style multimodal blocks type literals with new style blocks.
-    Speficially, "image", "audio", and "file".
+    Specifically, "image", "audio", and "file".
 
     See the docstring of `_normalize_messages` in `language_models._utils` for details.
     """
@@ -906,7 +906,7 @@ def is_data_content_block(block: dict) -> bool:
 
         # 'text' is checked to support v0 PlainTextContentBlock types
         # We must guard against new style TextContentBlock which also has 'text' `type`
-        # by ensuring the presense of `source_type`
+        # by ensuring the presence of `source_type`
         if block["type"] == "text" and "source_type" not in block:  # noqa: SIM103  # This is more readable
             return False
 
@@ -1399,7 +1399,7 @@ def create_non_standard_block(
     """Create a `NonStandardContentBlock`.
 
     Args:
-        value: Provider-specific data.
+        value: Provider-specific content data.
         id: Content block identifier. Generated automatically if not provided.
         index: Index of block in aggregate response. Used during streaming.
 

libs/core/langchain_core/messages/utils.py

@@ -86,7 +86,7 @@ AnyMessage = Annotated[
     | Annotated[ToolMessageChunk, Tag(tag="ToolMessageChunk")],
     Field(discriminator=Discriminator(_get_type)),
 ]
-""""A type representing any defined `Message` or `MessageChunk` type."""
+"""A type representing any defined `Message` or `MessageChunk` type."""
 
 
 def get_buffer_string(
@@ -328,12 +328,16 @@ def _convert_to_message(message: MessageLikeRepresentation) -> BaseMessage:
     """
     if isinstance(message, BaseMessage):
         message_ = message
-    elif isinstance(message, str):
-        message_ = _create_message_from_message_type("human", message)
-    elif isinstance(message, Sequence) and len(message) == 2:
-        # mypy doesn't realise this can't be a string given the previous branch
-        message_type_str, template = message  # type: ignore[misc]
-        message_ = _create_message_from_message_type(message_type_str, template)
+    elif isinstance(message, Sequence):
+        if isinstance(message, str):
+            message_ = _create_message_from_message_type("human", message)
+        else:
+            try:
+                message_type_str, template = message
+            except ValueError as e:
+                msg = "Message as a sequence must be (role string, template)"
+                raise NotImplementedError(msg) from e
+            message_ = _create_message_from_message_type(message_type_str, template)
     elif isinstance(message, dict):
         msg_kwargs = message.copy()
         try:
@@ -439,8 +443,8 @@ def filter_messages(
         exclude_ids: Message IDs to exclude.
         exclude_tool_calls: Tool call IDs to exclude.
             Can be one of the following:
-            - `True`: all `AIMessage`s with tool calls and all
-                `ToolMessage` objects will be excluded.
+            - `True`: All `AIMessage` objects with tool calls and all `ToolMessage`
+                objects will be excluded.
             - a sequence of tool call IDs to exclude:
                 - `ToolMessage` objects with the corresponding tool call ID will be
                     excluded.
@@ -1025,18 +1029,18 @@ def convert_to_openai_messages(
         messages: Message-like object or iterable of objects whose contents are
             in OpenAI, Anthropic, Bedrock Converse, or VertexAI formats.
         text_format: How to format string or text block contents:
-                - `'string'`:
-                    If a message has a string content, this is left as a string. If
-                    a message has content blocks that are all of type `'text'`, these
-                    are joined with a newline to make a single string. If a message has
-                    content blocks and at least one isn't of type `'text'`, then
-                    all blocks are left as dicts.
-                - `'block'`:
-                    If a message has a string content, this is turned into a list
-                    with a single content block of type `'text'`. If a message has
-                    content blocks these are left as is.
-        include_id: Whether to include message ids in the openai messages, if they
-                    are present in the source messages.
+            - `'string'`:
+                If a message has a string content, this is left as a string. If
+                a message has content blocks that are all of type `'text'`, these
+                are joined with a newline to make a single string. If a message has
+                content blocks and at least one isn't of type `'text'`, then
+                all blocks are left as dicts.
+            - `'block'`:
+                If a message has a string content, this is turned into a list
+                with a single content block of type `'text'`. If a message has
+                content blocks these are left as is.
+        include_id: Whether to include message IDs in the openai messages, if they
+            are present in the source messages.
 
     Raises:
         ValueError: if an unrecognized `text_format` is specified, or if a message
@@ -1097,7 +1101,7 @@ def convert_to_openai_messages(
         # ]
         ```
 
-    !!! version-added "Added in version 0.3.11"
+    !!! version-added "Added in `langchain-core` 0.3.11"
 
     """  # noqa: E501
     if text_format not in {"string", "block"}:
@@ -1697,7 +1701,7 @@ def count_tokens_approximately(
     Warning:
         This function does not currently support counting image tokens.
 
-    !!! version-added "Added in version 0.3.46"
+    !!! version-added "Added in `langchain-core` 0.3.46"
 
     """
     token_count = 0.0

libs/core/langchain_core/output_parsers/__init__.py

@@ -1,4 +1,20 @@
-"""**OutputParser** classes parse the output of an LLM call."""
+"""`OutputParser` classes parse the output of an LLM call into structured data.
+
+!!! tip "Structured output"
+
+    Output parsers emerged as an early solution to the challenge of obtaining structured
+    output from LLMs.
+
+    Today, most LLMs support [structured output](https://docs.langchain.com/oss/python/langchain/models#structured-outputs)
+    natively. In such cases, using output parsers may be unnecessary, and you should
+    leverage the model's built-in capabilities for structured output. Refer to the
+    [documentation of your chosen model](https://docs.langchain.com/oss/python/integrations/providers/overview)
+    for guidance on how to achieve structured output directly.
+
+    Output parsers remain valuable when working with models that do not support
+    structured output natively, or when you require additional processing or validation
+    of the model's output beyond its inherent capabilities.
+"""
 
 from typing import TYPE_CHECKING
 

libs/core/langchain_core/output_parsers/base.py

@@ -135,6 +135,9 @@ class BaseOutputParser(
 
     Example:
         ```python
+        # Implement a simple boolean output parser
+
+
         class BooleanOutputParser(BaseOutputParser[bool]):
             true_val: str = "YES"
             false_val: str = "NO"

libs/core/langchain_core/output_parsers/format_instructions.py

@@ -1,11 +1,16 @@
 """Format instructions."""
 
-JSON_FORMAT_INSTRUCTIONS = """The output should be formatted as a JSON instance that conforms to the JSON schema below.
+JSON_FORMAT_INSTRUCTIONS = """STRICT OUTPUT FORMAT:
+- Return only the JSON value that conforms to the schema. Do not include any additional text, explanations, headings, or separators.
+- Do not wrap the JSON in Markdown or code fences (no ``` or ```json).
+- Do not prepend or append any text (e.g., do not write "Here is the JSON:").
+- The response must be a single top-level JSON value exactly as required by the schema (object/array/etc.), with no trailing commas or comments.
 
-As an example, for the schema {{"properties": {{"foo": {{"title": "Foo", "description": "a list of strings", "type": "array", "items": {{"type": "string"}}}}}}, "required": ["foo"]}}
-the object {{"foo": ["bar", "baz"]}} is a well-formatted instance of the schema. The object {{"properties": {{"foo": ["bar", "baz"]}}}} is not well-formatted.
+The output should be formatted as a JSON instance that conforms to the JSON schema below.
 
-Here is the output schema:
+As an example, for the schema {{"properties": {{"foo": {{"title": "Foo", "description": "a list of strings", "type": "array", "items": {{"type": "string"}}}}}}, "required": ["foo"]}} the object {{"foo": ["bar", "baz"]}} is a well-formatted instance of the schema. The object {{"properties": {{"foo": ["bar", "baz"]}}}} is not well-formatted.
+
+Here is the output schema (shown in a code block for readability only — do not include any backticks or Markdown in your output):
 ```
 {schema}
 ```"""  # noqa: E501

libs/core/langchain_core/output_parsers/json.py

@@ -31,11 +31,14 @@ TBaseModel = TypeVar("TBaseModel", bound=PydanticBaseModel)
 class JsonOutputParser(BaseCumulativeTransformOutputParser[Any]):
     """Parse the output of an LLM call to a JSON object.
 
+    Probably the most reliable output parser for getting structured data that does *not*
+    use function calling.
+
     When used in streaming mode, it will yield partial JSON objects containing
     all the keys that have been returned so far.
 
-    In streaming, if `diff` is set to `True`, yields JSONPatch operations
-    describing the difference between the previous and the current object.
+    In streaming, if `diff` is set to `True`, yields JSONPatch operations describing the
+    difference between the previous and the current object.
     """
 
     pydantic_object: Annotated[type[TBaseModel] | None, SkipValidation()] = None  # type: ignore[valid-type]

libs/core/langchain_core/output_parsers/list.py

@@ -41,7 +41,7 @@ def droplastn(
 
 
 class ListOutputParser(BaseTransformOutputParser[list[str]]):
-    """Parse the output of an LLM call to a list."""
+    """Parse the output of a model to a list."""
 
     @property
     def _type(self) -> str:
@@ -74,30 +74,30 @@ class ListOutputParser(BaseTransformOutputParser[list[str]]):
         buffer = ""
         for chunk in input:
             if isinstance(chunk, BaseMessage):
-                # extract text
+                # Extract text
                 chunk_content = chunk.content
                 if not isinstance(chunk_content, str):
                     continue
                 buffer += chunk_content
             else:
-                # add current chunk to buffer
+                # Add current chunk to buffer
                 buffer += chunk
-            # parse buffer into a list of parts
+            # Parse buffer into a list of parts
             try:
                 done_idx = 0
-                # yield only complete parts
+                # Yield only complete parts
                 for m in droplastn(self.parse_iter(buffer), 1):
                     done_idx = m.end()
                     yield [m.group(1)]
                 buffer = buffer[done_idx:]
             except NotImplementedError:
                 parts = self.parse(buffer)
-                # yield only complete parts
+                # Yield only complete parts
                 if len(parts) > 1:
                     for part in parts[:-1]:
                         yield [part]
                     buffer = parts[-1]
-        # yield the last part
+        # Yield the last part
         for part in self.parse(buffer):
             yield [part]
 
@@ -108,40 +108,40 @@ class ListOutputParser(BaseTransformOutputParser[list[str]]):
         buffer = ""
         async for chunk in input:
             if isinstance(chunk, BaseMessage):
-                # extract text
+                # Extract text
                 chunk_content = chunk.content
                 if not isinstance(chunk_content, str):
                     continue
                 buffer += chunk_content
             else:
-                # add current chunk to buffer
+                # Add current chunk to buffer
                 buffer += chunk
-            # parse buffer into a list of parts
+            # Parse buffer into a list of parts
             try:
                 done_idx = 0
-                # yield only complete parts
+                # Yield only complete parts
                 for m in droplastn(self.parse_iter(buffer), 1):
                     done_idx = m.end()
                     yield [m.group(1)]
                 buffer = buffer[done_idx:]
             except NotImplementedError:
                 parts = self.parse(buffer)
-                # yield only complete parts
+                # Yield only complete parts
                 if len(parts) > 1:
                     for part in parts[:-1]:
                         yield [part]
                     buffer = parts[-1]
-        # yield the last part
+        # Yield the last part
         for part in self.parse(buffer):
             yield [part]
 
 
 class CommaSeparatedListOutputParser(ListOutputParser):
-    """Parse the output of an LLM call to a comma-separated list."""
+    """Parse the output of a model to a comma-separated list."""
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -177,7 +177,7 @@ class CommaSeparatedListOutputParser(ListOutputParser):
             )
             return [item for sublist in reader for item in sublist]
         except csv.Error:
-            # keep old logic for backup
+            # Keep old logic for backup
             return [part.strip() for part in text.split(",")]
 
     @property

libs/core/langchain_core/output_parsers/openai_tools.py

@@ -15,7 +15,11 @@ from langchain_core.messages.tool import tool_call as create_tool_call
 from langchain_core.output_parsers.transform import BaseCumulativeTransformOutputParser
 from langchain_core.outputs import ChatGeneration, Generation
 from langchain_core.utils.json import parse_partial_json
-from langchain_core.utils.pydantic import TypeBaseModel
+from langchain_core.utils.pydantic import (
+    TypeBaseModel,
+    is_pydantic_v1_subclass,
+    is_pydantic_v2_subclass,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -224,7 +228,7 @@ class JsonOutputKeyToolsParser(JsonOutputToolsParser):
             result: The result of the LLM call.
             partial: Whether to parse partial JSON.
                 If `True`, the output will be a JSON object containing
-                all the keys that have been returned so far.
+                    all the keys that have been returned so far.
                 If `False`, the output will be the full JSON object.
 
         Raises:
@@ -307,7 +311,7 @@ class PydanticToolsParser(JsonOutputToolsParser):
             result: The result of the LLM call.
             partial: Whether to parse partial JSON.
                 If `True`, the output will be a JSON object containing
-                all the keys that have been returned so far.
+                    all the keys that have been returned so far.
                 If `False`, the output will be the full JSON object.
 
         Returns:
@@ -323,7 +327,15 @@ class PydanticToolsParser(JsonOutputToolsParser):
             return None if self.first_tool_only else []
 
         json_results = [json_results] if self.first_tool_only else json_results
-        name_dict = {tool.__name__: tool for tool in self.tools}
+        name_dict_v2: dict[str, TypeBaseModel] = {
+            tool.model_config.get("title") or tool.__name__: tool
+            for tool in self.tools
+            if is_pydantic_v2_subclass(tool)
+        }
+        name_dict_v1: dict[str, TypeBaseModel] = {
+            tool.__name__: tool for tool in self.tools if is_pydantic_v1_subclass(tool)
+        }
+        name_dict: dict[str, TypeBaseModel] = {**name_dict_v2, **name_dict_v1}
         pydantic_objects = []
         for res in json_results:
             if not isinstance(res["args"], dict):

libs/core/langchain_core/output_parsers/pydantic.py

@@ -86,7 +86,7 @@ class PydanticOutputParser(JsonOutputParser, Generic[TBaseModel]):
             The format instructions for the JSON output.
         """
         # Copy schema to avoid altering original Pydantic schema.
-        schema = dict(self.pydantic_object.model_json_schema().items())
+        schema = dict(self._get_schema(self.pydantic_object).items())
 
         # Remove extraneous fields.
         reduced_schema = schema

libs/core/langchain_core/output_parsers/string.py

@@ -6,14 +6,14 @@ from langchain_core.output_parsers.transform import BaseTransformOutputParser
 
 
 class StrOutputParser(BaseTransformOutputParser[str]):
-    """OutputParser that parses LLMResult into the top likely string."""
+    """OutputParser that parses `LLMResult` into the top likely string."""
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """StrOutputParser is serializable.
+        """`StrOutputParser` is serializable.
 
         Returns:
-            True
+            `True`
         """
         return True
 

libs/core/langchain_core/output_parsers/xml.py

@@ -43,19 +43,19 @@ class _StreamingParser:
     """Streaming parser for XML.
 
     This implementation is pulled into a class to avoid implementation
-    drift between transform and atransform of the XMLOutputParser.
+    drift between transform and atransform of the `XMLOutputParser`.
     """
 
     def __init__(self, parser: Literal["defusedxml", "xml"]) -> None:
         """Initialize the streaming parser.
 
         Args:
-            parser: Parser to use for XML parsing. Can be either 'defusedxml' or 'xml'.
-              See documentation in XMLOutputParser for more information.
+            parser: Parser to use for XML parsing. Can be either `'defusedxml'` or
+                `'xml'`. See documentation in `XMLOutputParser` for more information.
 
         Raises:
-            ImportError: If defusedxml is not installed and the defusedxml
-                parser is requested.
+            ImportError: If `defusedxml` is not installed and the `defusedxml` parser is
+                requested.
         """
         if parser == "defusedxml":
             if not _HAS_DEFUSEDXML:
@@ -79,10 +79,10 @@ class _StreamingParser:
         """Parse a chunk of text.
 
         Args:
-            chunk: A chunk of text to parse. This can be a string or a BaseMessage.
+            chunk: A chunk of text to parse. This can be a `str` or a `BaseMessage`.
 
         Yields:
-            A dictionary representing the parsed XML element.
+            A `dict` representing the parsed XML element.
 
         Raises:
             xml.etree.ElementTree.ParseError: If the XML is not well-formed.
@@ -147,46 +147,49 @@ class _StreamingParser:
 
 
 class XMLOutputParser(BaseTransformOutputParser):
-    """Parse an output using xml format."""
+    """Parse an output using xml format.
+
+    Returns a dictionary of tags.
+    """
 
     tags: list[str] | None = None
     """Tags to tell the LLM to expect in the XML output.
 
     Note this may not be perfect depending on the LLM implementation.
 
-    For example, with tags=["foo", "bar", "baz"]:
+    For example, with `tags=["foo", "bar", "baz"]`:
 
     1. A well-formatted XML instance:
-       "<foo>\n   <bar>\n      <baz></baz>\n   </bar>\n</foo>"
+        `"<foo>\n   <bar>\n      <baz></baz>\n   </bar>\n</foo>"`
 
     2. A badly-formatted XML instance (missing closing tag for 'bar'):
-       "<foo>\n   <bar>\n   </foo>"
+        `"<foo>\n   <bar>\n   </foo>"`
 
     3. A badly-formatted XML instance (unexpected 'tag' element):
-       "<foo>\n   <tag>\n   </tag>\n</foo>"
+        `"<foo>\n   <tag>\n   </tag>\n</foo>"`
     """
     encoding_matcher: re.Pattern = re.compile(
         r"<([^>]*encoding[^>]*)>\n(.*)", re.MULTILINE | re.DOTALL
     )
     parser: Literal["defusedxml", "xml"] = "defusedxml"
-    """Parser to use for XML parsing. Can be either 'defusedxml' or 'xml'.
+    """Parser to use for XML parsing. Can be either `'defusedxml'` or `'xml'`.
 
-    * 'defusedxml' is the default parser and is used to prevent XML vulnerabilities
-       present in some distributions of Python's standard library xml.
-       `defusedxml` is a wrapper around the standard library parser that
-       sets up the parser with secure defaults.
-    * 'xml' is the standard library parser.
+    * `'defusedxml'` is the default parser and is used to prevent XML vulnerabilities
+        present in some distributions of Python's standard library xml.
+        `defusedxml` is a wrapper around the standard library parser that
+        sets up the parser with secure defaults.
+    * `'xml'` is the standard library parser.
 
-    Use `xml` only if you are sure that your distribution of the standard library
-    is not vulnerable to XML vulnerabilities.
+    Use `xml` only if you are sure that your distribution of the standard library is not
+    vulnerable to XML vulnerabilities.
 
     Please review the following resources for more information:
 
     * https://docs.python.org/3/library/xml.html#xml-vulnerabilities
     * https://github.com/tiran/defusedxml
 
-    The standard library relies on libexpat for parsing XML:
-    https://github.com/libexpat/libexpat
+    The standard library relies on [`libexpat`](https://github.com/libexpat/libexpat)
+    for parsing XML.
     """
 
     def get_format_instructions(self) -> str:
@@ -200,12 +203,12 @@ class XMLOutputParser(BaseTransformOutputParser):
             text: The output of an LLM call.
 
         Returns:
-            A dictionary representing the parsed XML.
+            A `dict` representing the parsed XML.
 
         Raises:
             OutputParserException: If the XML is not well-formed.
-            ImportError: If defusedxml is not installed and the defusedxml
-                parser is requested.
+            ImportError: If defus`edxml is not installed and the `defusedxml` parser is
+                requested.
         """
         # Try to find XML string within triple backticks
         # Imports are temporarily placed here to avoid issue with caching on CI

libs/core/langchain_core/outputs/chat_generation.py

@@ -2,15 +2,17 @@
 
 from __future__ import annotations
 
-from typing import Literal
+from typing import TYPE_CHECKING, Literal
 
 from pydantic import model_validator
-from typing_extensions import Self
 
 from langchain_core.messages import BaseMessage, BaseMessageChunk
 from langchain_core.outputs.generation import Generation
 from langchain_core.utils._merge import merge_dicts
 
+if TYPE_CHECKING:
+    from typing_extensions import Self
+
 
 class ChatGeneration(Generation):
     """A single chat generation output.

libs/core/langchain_core/outputs/generation.py

@@ -11,9 +11,8 @@ from langchain_core.utils._merge import merge_dicts
 class Generation(Serializable):
     """A single text generation output.
 
-    Generation represents the response from an
-    `"old-fashioned" LLM <https://python.langchain.com/docs/concepts/text_llms/>__` that
-    generates regular text (not chat messages).
+    Generation represents the response from an "old-fashioned" LLM (string-in,
+    string-out) that generates regular text (not chat messages).
 
     This model is used internally by chat model and will eventually
     be mapped to a more general `LLMResult` object, and then projected into
@@ -21,8 +20,7 @@ class Generation(Serializable):
 
     LangChain users working with chat models will usually access information via
     `AIMessage` (returned from runnable interfaces) or `LLMResult` (available
-    via callbacks). Please refer the `AIMessage` and `LLMResult` schema documentation
-    for more information.
+    via callbacks). Please refer to `AIMessage` and `LLMResult` for more information.
     """
 
     text: str
@@ -35,11 +33,13 @@ class Generation(Serializable):
     """
     type: Literal["Generation"] = "Generation"
     """Type is used exclusively for serialization purposes.
-    Set to "Generation" for this class."""
+
+    Set to "Generation" for this class.
+    """
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -53,7 +53,7 @@ class Generation(Serializable):
 
 
 class GenerationChunk(Generation):
-    """Generation chunk, which can be concatenated with other Generation chunks."""
+    """`GenerationChunk`, which can be concatenated with other Generation chunks."""
 
     def __add__(self, other: GenerationChunk) -> GenerationChunk:
         """Concatenate two `GenerationChunk`s.

libs/core/langchain_core/prompt_values.py

@@ -30,15 +30,13 @@ class PromptValue(Serializable, ABC):
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
     def get_lc_namespace(cls) -> list[str]:
         """Get the namespace of the LangChain object.
 
-        This is used to determine the namespace of the object when serializing.
-
         Returns:
             `["langchain", "schema", "prompt"]`
         """
@@ -50,7 +48,7 @@ class PromptValue(Serializable, ABC):
 
     @abstractmethod
     def to_messages(self) -> list[BaseMessage]:
-        """Return prompt as a list of Messages."""
+        """Return prompt as a list of messages."""
 
 
 class StringPromptValue(PromptValue):
@@ -64,8 +62,6 @@ class StringPromptValue(PromptValue):
     def get_lc_namespace(cls) -> list[str]:
         """Get the namespace of the LangChain object.
 
-        This is used to determine the namespace of the object when serializing.
-
         Returns:
             `["langchain", "prompts", "base"]`
         """
@@ -101,8 +97,6 @@ class ChatPromptValue(PromptValue):
     def get_lc_namespace(cls) -> list[str]:
         """Get the namespace of the LangChain object.
 
-        This is used to determine the namespace of the object when serializing.
-
         Returns:
             `["langchain", "prompts", "chat"]`
         """

libs/core/langchain_core/prompts/base.py

@@ -6,7 +6,7 @@ import contextlib
 import json
 import typing
 from abc import ABC, abstractmethod
-from collections.abc import Callable, Mapping
+from collections.abc import Mapping
 from functools import cached_property
 from pathlib import Path
 from typing import (
@@ -33,6 +33,8 @@ from langchain_core.runnables.config import ensure_config
 from langchain_core.utils.pydantic import create_model_v2
 
 if TYPE_CHECKING:
+    from collections.abc import Callable
+
     from langchain_core.documents import Document
 
 
@@ -46,21 +48,27 @@ class BasePromptTemplate(
 
     input_variables: list[str]
     """A list of the names of the variables whose values are required as inputs to the
-    prompt."""
+    prompt.
+    """
     optional_variables: list[str] = Field(default=[])
-    """optional_variables: A list of the names of the variables for placeholder
-       or MessagePlaceholder that are optional. These variables are auto inferred
-       from the prompt and user need not provide them."""
+    """A list of the names of the variables for placeholder or `MessagePlaceholder` that
+    are optional.
+
+    These variables are auto inferred from the prompt and user need not provide them.
+    """
     input_types: typing.Dict[str, Any] = Field(default_factory=dict, exclude=True)  # noqa: UP006
     """A dictionary of the types of the variables the prompt template expects.
-    If not provided, all variables are assumed to be strings."""
+
+    If not provided, all variables are assumed to be strings.
+    """
     output_parser: BaseOutputParser | None = None
     """How to parse the output of calling an LLM on this formatted prompt."""
     partial_variables: Mapping[str, Any] = Field(default_factory=dict)
     """A dictionary of the partial variables the prompt template carries.
 
-    Partial variables populate the template so that you don't need to
-    pass them in every time you call the prompt."""
+    Partial variables populate the template so that you don't need to pass them in every
+    time you call the prompt.
+    """
     metadata: typing.Dict[str, Any] | None = None  # noqa: UP006
     """Metadata to be used for tracing."""
     tags: list[str] | None = None
@@ -105,7 +113,7 @@ class BasePromptTemplate(
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     model_config = ConfigDict(
@@ -127,7 +135,7 @@ class BasePromptTemplate(
         """Get the input schema for the prompt.
 
         Args:
-            config: configuration for the prompt.
+            config: Configuration for the prompt.
 
         Returns:
             The input schema for the prompt.
@@ -195,8 +203,8 @@ class BasePromptTemplate(
         """Invoke the prompt.
 
         Args:
-            input: Dict, input to the prompt.
-            config: RunnableConfig, configuration for the prompt.
+            input: Input to the prompt.
+            config: Configuration for the prompt.
 
         Returns:
             The output of the prompt.
@@ -221,8 +229,8 @@ class BasePromptTemplate(
         """Async invoke the prompt.
 
         Args:
-            input: Dict, input to the prompt.
-            config: RunnableConfig, configuration for the prompt.
+            input: Input to the prompt.
+            config: Configuration for the prompt.
 
         Returns:
             The output of the prompt.
@@ -242,7 +250,7 @@ class BasePromptTemplate(
 
     @abstractmethod
     def format_prompt(self, **kwargs: Any) -> PromptValue:
-        """Create Prompt Value.
+        """Create `PromptValue`.
 
         Args:
             **kwargs: Any arguments to be passed to the prompt template.
@@ -252,7 +260,7 @@ class BasePromptTemplate(
         """
 
     async def aformat_prompt(self, **kwargs: Any) -> PromptValue:
-        """Async create Prompt Value.
+        """Async create `PromptValue`.
 
         Args:
             **kwargs: Any arguments to be passed to the prompt template.
@@ -266,7 +274,7 @@ class BasePromptTemplate(
         """Return a partial of the prompt template.
 
         Args:
-            **kwargs: partial variables to set.
+            **kwargs: Partial variables to set.
 
         Returns:
             A partial of the prompt template.
@@ -296,9 +304,9 @@ class BasePromptTemplate(
             A formatted string.
 
         Example:
-        ```python
-        prompt.format(variable1="foo")
-        ```
+            ```python
+            prompt.format(variable1="foo")
+            ```
         """
 
     async def aformat(self, **kwargs: Any) -> FormatOutputType:
@@ -311,9 +319,9 @@ class BasePromptTemplate(
             A formatted string.
 
         Example:
-        ```python
-        await prompt.aformat(variable1="foo")
-        ```
+            ```python
+            await prompt.aformat(variable1="foo")
+            ```
         """
         return self.format(**kwargs)
 
@@ -348,9 +356,9 @@ class BasePromptTemplate(
             NotImplementedError: If the prompt type is not implemented.
 
         Example:
-        ```python
-        prompt.save(file_path="path/prompt.yaml")
-        ```
+            ```python
+            prompt.save(file_path="path/prompt.yaml")
+            ```
         """
         if self.partial_variables:
             msg = "Cannot save prompt with partial variables."
@@ -402,23 +410,23 @@ def format_document(doc: Document, prompt: BasePromptTemplate[str]) -> str:
 
     First, this pulls information from the document from two sources:
 
-    1. page_content:
-        This takes the information from the `document.page_content`
-        and assigns it to a variable named `page_content`.
-    2. metadata:
-        This takes information from `document.metadata` and assigns
-        it to variables of the same name.
+    1. `page_content`:
+        This takes the information from the `document.page_content` and assigns it to a
+        variable named `page_content`.
+    2. `metadata`:
+        This takes information from `document.metadata` and assigns it to variables of
+        the same name.
 
     Those variables are then passed into the `prompt` to produce a formatted string.
 
     Args:
-        doc: Document, the page_content and metadata will be used to create
+        doc: `Document`, the `page_content` and `metadata` will be used to create
             the final string.
-        prompt: BasePromptTemplate, will be used to format the page_content
-            and metadata into the final string.
+        prompt: `BasePromptTemplate`, will be used to format the `page_content`
+            and `metadata` into the final string.
 
     Returns:
-        string of the document formatted.
+        String of the document formatted.
 
     Example:
         ```python
@@ -429,7 +437,6 @@ def format_document(doc: Document, prompt: BasePromptTemplate[str]) -> str:
         prompt = PromptTemplate.from_template("Page {page}: {page_content}")
         format_document(doc, prompt)
         >>> "Page 1: This is a joke"
-
         ```
     """
     return prompt.format(**_get_document_info(doc, prompt))
@@ -440,22 +447,22 @@ async def aformat_document(doc: Document, prompt: BasePromptTemplate[str]) -> st
 
     First, this pulls information from the document from two sources:
 
-    1. page_content:
-        This takes the information from the `document.page_content`
-        and assigns it to a variable named `page_content`.
-    2. metadata:
-        This takes information from `document.metadata` and assigns
-        it to variables of the same name.
+    1. `page_content`:
+        This takes the information from the `document.page_content` and assigns it to a
+        variable named `page_content`.
+    2. `metadata`:
+        This takes information from `document.metadata` and assigns it to variables of
+        the same name.
 
     Those variables are then passed into the `prompt` to produce a formatted string.
 
     Args:
-        doc: Document, the page_content and metadata will be used to create
+        doc: `Document`, the `page_content` and `metadata` will be used to create
             the final string.
-        prompt: BasePromptTemplate, will be used to format the page_content
-            and metadata into the final string.
+        prompt: `BasePromptTemplate`, will be used to format the `page_content`
+            and `metadata` into the final string.
 
     Returns:
-        string of the document formatted.
+        String of the document formatted.
     """
     return await prompt.aformat(**_get_document_info(doc, prompt))

libs/core/langchain_core/prompts/chat.py

@@ -587,14 +587,15 @@ class _StringImageMessagePromptTemplate(BaseMessagePromptTemplate):
         for prompt in self.prompt:
             inputs = {var: kwargs[var] for var in prompt.input_variables}
             if isinstance(prompt, StringPromptTemplate):
-                formatted: str | ImageURL | dict[str, Any] = prompt.format(**inputs)
-                content.append({"type": "text", "text": formatted})
+                formatted_text: str = prompt.format(**inputs)
+                if formatted_text != "":
+                    content.append({"type": "text", "text": formatted_text})
             elif isinstance(prompt, ImagePromptTemplate):
-                formatted = prompt.format(**inputs)
-                content.append({"type": "image_url", "image_url": formatted})
+                formatted_image: ImageURL = prompt.format(**inputs)
+                content.append({"type": "image_url", "image_url": formatted_image})
             elif isinstance(prompt, DictPromptTemplate):
-                formatted = prompt.format(**inputs)
-                content.append(formatted)
+                formatted_dict: dict[str, Any] = prompt.format(**inputs)
+                content.append(formatted_dict)
         return self._msg_class(
             content=content, additional_kwargs=self.additional_kwargs
         )
@@ -617,16 +618,15 @@ class _StringImageMessagePromptTemplate(BaseMessagePromptTemplate):
         for prompt in self.prompt:
             inputs = {var: kwargs[var] for var in prompt.input_variables}
             if isinstance(prompt, StringPromptTemplate):
-                formatted: str | ImageURL | dict[str, Any] = await prompt.aformat(
-                    **inputs
-                )
-                content.append({"type": "text", "text": formatted})
+                formatted_text: str = await prompt.aformat(**inputs)
+                if formatted_text != "":
+                    content.append({"type": "text", "text": formatted_text})
             elif isinstance(prompt, ImagePromptTemplate):
-                formatted = await prompt.aformat(**inputs)
-                content.append({"type": "image_url", "image_url": formatted})
+                formatted_image: ImageURL = await prompt.aformat(**inputs)
+                content.append({"type": "image_url", "image_url": formatted_image})
             elif isinstance(prompt, DictPromptTemplate):
-                formatted = prompt.format(**inputs)
-                content.append(formatted)
+                formatted_dict: dict[str, Any] = prompt.format(**inputs)
+                content.append(formatted_dict)
         return self._msg_class(
             content=content, additional_kwargs=self.additional_kwargs
         )
@@ -776,42 +776,36 @@ class ChatPromptTemplate(BaseChatPromptTemplate):
 
     Use to create flexible templated prompts for chat models.
 
-    Examples:
-        !!! warning "Behavior changed in 0.2.24"
-            You can pass any Message-like formats supported by
-            `ChatPromptTemplate.from_messages()` directly to `ChatPromptTemplate()`
-            init.
+    ```python
+    from langchain_core.prompts import ChatPromptTemplate
 
-        ```python
-        from langchain_core.prompts import ChatPromptTemplate
+    template = ChatPromptTemplate(
+        [
+            ("system", "You are a helpful AI bot. Your name is {name}."),
+            ("human", "Hello, how are you doing?"),
+            ("ai", "I'm doing well, thanks!"),
+            ("human", "{user_input}"),
+        ]
+    )
 
-        template = ChatPromptTemplate(
-            [
-                ("system", "You are a helpful AI bot. Your name is {name}."),
-                ("human", "Hello, how are you doing?"),
-                ("ai", "I'm doing well, thanks!"),
-                ("human", "{user_input}"),
-            ]
-        )
+    prompt_value = template.invoke(
+        {
+            "name": "Bob",
+            "user_input": "What is your name?",
+        }
+    )
+    # Output:
+    # ChatPromptValue(
+    #    messages=[
+    #        SystemMessage(content='You are a helpful AI bot. Your name is Bob.'),
+    #        HumanMessage(content='Hello, how are you doing?'),
+    #        AIMessage(content="I'm doing well, thanks!"),
+    #        HumanMessage(content='What is your name?')
+    #    ]
+    # )
+    ```
 
-        prompt_value = template.invoke(
-            {
-                "name": "Bob",
-                "user_input": "What is your name?",
-            }
-        )
-        # Output:
-        # ChatPromptValue(
-        #    messages=[
-        #        SystemMessage(content='You are a helpful AI bot. Your name is Bob.'),
-        #        HumanMessage(content='Hello, how are you doing?'),
-        #        AIMessage(content="I'm doing well, thanks!"),
-        #        HumanMessage(content='What is your name?')
-        #    ]
-        # )
-        ```
-
-    Messages Placeholder:
+    !!! note "Messages Placeholder"
 
         ```python
         # In addition to Human/AI/Tool/Function messages,
@@ -852,13 +846,12 @@ class ChatPromptTemplate(BaseChatPromptTemplate):
         # )
         ```
 
-    Single-variable template:
+    !!! note "Single-variable template"
 
         If your prompt has only a single input variable (i.e., 1 instance of "{variable_nams}"),
         and you invoke the template with a non-dict object, the prompt template will
         inject the provided argument into that variable location.
 
-
         ```python
         from langchain_core.prompts import ChatPromptTemplate
 
@@ -898,25 +891,35 @@ class ChatPromptTemplate(BaseChatPromptTemplate):
         """Create a chat prompt template from a variety of message formats.
 
         Args:
-            messages: sequence of message representations.
+            messages: Sequence of message representations.
+
                 A message can be represented using the following formats:
-                (1) BaseMessagePromptTemplate, (2) BaseMessage, (3) 2-tuple of
-                (message type, template); e.g., ("human", "{user_input}"),
-                (4) 2-tuple of (message class, template), (5) a string which is
-                shorthand for ("human", template); e.g., "{user_input}".
-            template_format: format of the template.
+
+                1. `BaseMessagePromptTemplate`
+                2. `BaseMessage`
+                3. 2-tuple of `(message type, template)`; e.g.,
+                    `("human", "{user_input}")`
+                4. 2-tuple of `(message class, template)`
+                5. A string which is shorthand for `("human", template)`; e.g.,
+                    `"{user_input}"`
+            template_format: Format of the template.
             input_variables: A list of the names of the variables whose values are
                 required as inputs to the prompt.
             optional_variables: A list of the names of the variables for placeholder
                 or MessagePlaceholder that are optional.
+
                 These variables are auto inferred from the prompt and user need not
                 provide them.
             partial_variables: A dictionary of the partial variables the prompt
-                template carries. Partial variables populate the template so that you
-                don't need to pass them in every time you call the prompt.
+                template carries.
+
+                Partial variables populate the template so that you don't need to pass
+                them in every time you call the prompt.
             validate_template: Whether to validate the template.
             input_types: A dictionary of the types of the variables the prompt template
-                expects. If not provided, all variables are assumed to be strings.
+                expects.
+
+                If not provided, all variables are assumed to be strings.
 
         Examples:
             Instantiation from a list of message templates:
@@ -1121,12 +1124,17 @@ class ChatPromptTemplate(BaseChatPromptTemplate):
             )
             ```
         Args:
-            messages: sequence of message representations.
+            messages: Sequence of message representations.
+
                 A message can be represented using the following formats:
-                (1) BaseMessagePromptTemplate, (2) BaseMessage, (3) 2-tuple of
-                (message type, template); e.g., ("human", "{user_input}"),
-                (4) 2-tuple of (message class, template), (5) a string which is
-                shorthand for ("human", template); e.g., "{user_input}".
+
+                1. `BaseMessagePromptTemplate`
+                2. `BaseMessage`
+                3. 2-tuple of `(message type, template)`; e.g.,
+                    `("human", "{user_input}")`
+                4. 2-tuple of `(message class, template)`
+                5. A string which is shorthand for `("human", template)`; e.g.,
+                    `"{user_input}"`
             template_format: format of the template.
 
         Returns:
@@ -1238,7 +1246,7 @@ class ChatPromptTemplate(BaseChatPromptTemplate):
         """Extend the chat template with a sequence of messages.
 
         Args:
-            messages: sequence of message representations to append.
+            messages: Sequence of message representations to append.
         """
         self.messages.extend(
             [_convert_to_message_template(message) for message in messages]
@@ -1335,11 +1343,25 @@ def _create_template_from_message_type(
                 raise ValueError(msg)
             var_name = template[1:-1]
             message = MessagesPlaceholder(variable_name=var_name, optional=True)
-        elif len(template) == 2 and isinstance(template[1], bool):
-            var_name_wrapped, is_optional = template
+        else:
+            try:
+                var_name_wrapped, is_optional = template
+            except ValueError as e:
+                msg = (
+                    "Unexpected arguments for placeholder message type."
+                    " Expected either a single string variable name"
+                    " or a list of [variable_name: str, is_optional: bool]."
+                    f" Got: {template}"
+                )
+                raise ValueError(msg) from e
+
+            if not isinstance(is_optional, bool):
+                msg = f"Expected is_optional to be a boolean. Got: {is_optional}"
+                raise ValueError(msg)  # noqa: TRY004
+
             if not isinstance(var_name_wrapped, str):
                 msg = f"Expected variable name to be a string. Got: {var_name_wrapped}"
-                raise ValueError(msg)  # noqa:TRY004
+                raise ValueError(msg)  # noqa: TRY004
             if var_name_wrapped[0] != "{" or var_name_wrapped[-1] != "}":
                 msg = (
                     f"Invalid placeholder template: {var_name_wrapped}."
@@ -1349,14 +1371,6 @@ def _create_template_from_message_type(
             var_name = var_name_wrapped[1:-1]
 
             message = MessagesPlaceholder(variable_name=var_name, optional=is_optional)
-        else:
-            msg = (
-                "Unexpected arguments for placeholder message type."
-                " Expected either a single string variable name"
-                " or a list of [variable_name: str, is_optional: bool]."
-                f" Got: {template}"
-            )
-            raise ValueError(msg)
     else:
         msg = (
             f"Unexpected message type: {message_type}. Use one of 'human',"
@@ -1410,10 +1424,11 @@ def _convert_to_message_template(
                 )
                 raise ValueError(msg)
             message = (message["role"], message["content"])
-        if len(message) != 2:
+        try:
+            message_type_str, template = message
+        except ValueError as e:
             msg = f"Expected 2-tuple of (role, template), got {message}"
-            raise ValueError(msg)
-        message_type_str, template = message
+            raise ValueError(msg) from e
         if isinstance(message_type_str, str):
             message_ = _create_template_from_message_type(
                 message_type_str, template, template_format=template_format

libs/core/langchain_core/prompts/dict.py

@@ -69,7 +69,7 @@ class DictPromptTemplate(RunnableSerializable[dict, dict]):
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod

libs/core/langchain_core/prompts/message.py

@@ -6,10 +6,10 @@ from abc import ABC, abstractmethod
 from typing import TYPE_CHECKING, Any
 
 from langchain_core.load import Serializable
-from langchain_core.messages import BaseMessage
 from langchain_core.utils.interactive_env import is_interactive_env
 
 if TYPE_CHECKING:
+    from langchain_core.messages import BaseMessage
     from langchain_core.prompts.chat import ChatPromptTemplate
 
 
@@ -18,7 +18,7 @@ class BaseMessagePromptTemplate(Serializable, ABC):
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -32,13 +32,13 @@ class BaseMessagePromptTemplate(Serializable, ABC):
 
     @abstractmethod
     def format_messages(self, **kwargs: Any) -> list[BaseMessage]:
-        """Format messages from kwargs. Should return a list of BaseMessages.
+        """Format messages from kwargs. Should return a list of `BaseMessage` objects.
 
         Args:
             **kwargs: Keyword arguments to use for formatting.
 
         Returns:
-            List of BaseMessages.
+            List of `BaseMessage` objects.
         """
 
     async def aformat_messages(self, **kwargs: Any) -> list[BaseMessage]:
@@ -48,7 +48,7 @@ class BaseMessagePromptTemplate(Serializable, ABC):
             **kwargs: Keyword arguments to use for formatting.
 
         Returns:
-            List of BaseMessages.
+            List of `BaseMessage` objects.
         """
         return self.format_messages(**kwargs)
 

libs/core/langchain_core/prompts/string.py

@@ -4,9 +4,8 @@ from __future__ import annotations
 
 import warnings
 from abc import ABC
-from collections.abc import Callable, Sequence
 from string import Formatter
-from typing import Any, Literal
+from typing import TYPE_CHECKING, Any, Literal
 
 from pydantic import BaseModel, create_model
 
@@ -16,6 +15,9 @@ from langchain_core.utils import get_colored_text, mustache
 from langchain_core.utils.formatting import formatter
 from langchain_core.utils.interactive_env import is_interactive_env
 
+if TYPE_CHECKING:
+    from collections.abc import Callable, Sequence
+
 try:
     from jinja2 import Environment, meta
     from jinja2.sandbox import SandboxedEnvironment
@@ -122,13 +124,16 @@ def mustache_formatter(template: str, /, **kwargs: Any) -> str:
 def mustache_template_vars(
     template: str,
 ) -> set[str]:
-    """Get the variables from a mustache template.
+    """Get the top-level variables from a mustache template.
+
+    For nested variables like `{{person.name}}`, only the top-level
+    key (`person`) is returned.
 
     Args:
         template: The template string.
 
     Returns:
-        The variables from the template.
+       The top-level variables from the template.
     """
     variables: set[str] = set()
     section_depth = 0

libs/core/langchain_core/prompts/structured.py

@@ -104,19 +104,23 @@ class StructuredPrompt(ChatPromptTemplate):
             )
             ```
         Args:
-            messages: sequence of message representations.
+            messages: Sequence of message representations.
+
                 A message can be represented using the following formats:
-                (1) BaseMessagePromptTemplate, (2) BaseMessage, (3) 2-tuple of
-                (message type, template); e.g., ("human", "{user_input}"),
-                (4) 2-tuple of (message class, template), (5) a string which is
-                shorthand for ("human", template); e.g., "{user_input}"
-            schema: a dictionary representation of function call, or a Pydantic model.
+
+                1. `BaseMessagePromptTemplate`
+                2. `BaseMessage`
+                3. 2-tuple of `(message type, template)`; e.g.,
+                    `("human", "{user_input}")`
+                4. 2-tuple of `(message class, template)`
+                5. A string which is shorthand for `("human", template)`; e.g.,
+                    `"{user_input}"`
+            schema: A dictionary representation of function call, or a Pydantic model.
             **kwargs: Any additional kwargs to pass through to
                 `ChatModel.with_structured_output(schema, **kwargs)`.
 
         Returns:
-            a structured prompt template
-
+            A structured prompt template
         """
         return cls(messages, schema, **kwargs)
 

libs/core/langchain_core/retrievers.py

@@ -50,65 +50,65 @@ class LangSmithRetrieverParams(TypedDict, total=False):
 
 
 class BaseRetriever(RunnableSerializable[RetrieverInput, RetrieverOutput], ABC):
-    """Abstract base class for a Document retrieval system.
+    """Abstract base class for a document retrieval system.
 
     A retrieval system is defined as something that can take string queries and return
-    the most 'relevant' Documents from some source.
+    the most 'relevant' documents from some source.
 
     Usage:
 
-    A retriever follows the standard Runnable interface, and should be used
-    via the standard Runnable methods of `invoke`, `ainvoke`, `batch`, `abatch`.
+    A retriever follows the standard `Runnable` interface, and should be used via the
+    standard `Runnable` methods of `invoke`, `ainvoke`, `batch`, `abatch`.
 
     Implementation:
 
-    When implementing a custom retriever, the class should implement
-    the `_get_relevant_documents` method to define the logic for retrieving documents.
+    When implementing a custom retriever, the class should implement the
+    `_get_relevant_documents` method to define the logic for retrieving documents.
 
     Optionally, an async native implementations can be provided by overriding the
     `_aget_relevant_documents` method.
 
-    Example: A retriever that returns the first 5 documents from a list of documents
+    !!! example "Retriever that returns the first 5 documents from a list of documents"
 
-    ```python
-    from langchain_core.documents import Document
-    from langchain_core.retrievers import BaseRetriever
+        ```python
+        from langchain_core.documents import Document
+        from langchain_core.retrievers import BaseRetriever
 
-    class SimpleRetriever(BaseRetriever):
-        docs: list[Document]
-        k: int = 5
+        class SimpleRetriever(BaseRetriever):
+            docs: list[Document]
+            k: int = 5
 
-        def _get_relevant_documents(self, query: str) -> list[Document]:
-            \"\"\"Return the first k documents from the list of documents\"\"\"
-            return self.docs[:self.k]
+            def _get_relevant_documents(self, query: str) -> list[Document]:
+                \"\"\"Return the first k documents from the list of documents\"\"\"
+                return self.docs[:self.k]
 
-        async def _aget_relevant_documents(self, query: str) -> list[Document]:
-            \"\"\"(Optional) async native implementation.\"\"\"
-            return self.docs[:self.k]
-    ```
+            async def _aget_relevant_documents(self, query: str) -> list[Document]:
+                \"\"\"(Optional) async native implementation.\"\"\"
+                return self.docs[:self.k]
+        ```
 
-    Example: A simple retriever based on a scikit-learn vectorizer
+    !!! example "Simple retriever based on a scikit-learn vectorizer"
 
-    ```python
-    from sklearn.metrics.pairwise import cosine_similarity
+        ```python
+        from sklearn.metrics.pairwise import cosine_similarity
 
 
-    class TFIDFRetriever(BaseRetriever, BaseModel):
-        vectorizer: Any
-        docs: list[Document]
-        tfidf_array: Any
-        k: int = 4
+        class TFIDFRetriever(BaseRetriever, BaseModel):
+            vectorizer: Any
+            docs: list[Document]
+            tfidf_array: Any
+            k: int = 4
 
-        class Config:
-            arbitrary_types_allowed = True
+            class Config:
+                arbitrary_types_allowed = True
 
-        def _get_relevant_documents(self, query: str) -> list[Document]:
-            # Ip -- (n_docs,x), Op -- (n_docs,n_Feats)
-            query_vec = self.vectorizer.transform([query])
-            # Op -- (n_docs,1) -- Cosine Sim with each doc
-            results = cosine_similarity(self.tfidf_array, query_vec).reshape((-1,))
-            return [self.docs[i] for i in results.argsort()[-self.k :][::-1]]
-    ```
+            def _get_relevant_documents(self, query: str) -> list[Document]:
+                # Ip -- (n_docs,x), Op -- (n_docs,n_Feats)
+                query_vec = self.vectorizer.transform([query])
+                # Op -- (n_docs,1) -- Cosine Sim with each doc
+                results = cosine_similarity(self.tfidf_array, query_vec).reshape((-1,))
+                return [self.docs[i] for i in results.argsort()[-self.k :][::-1]]
+        ```
     """
 
     model_config = ConfigDict(
@@ -119,15 +119,19 @@ class BaseRetriever(RunnableSerializable[RetrieverInput, RetrieverOutput], ABC):
     _expects_other_args: bool = False
     tags: list[str] | None = None
     """Optional list of tags associated with the retriever.
+
     These tags will be associated with each call to this retriever,
     and passed as arguments to the handlers defined in `callbacks`.
+
     You can use these to eg identify a specific instance of a retriever with its
     use case.
     """
     metadata: dict[str, Any] | None = None
     """Optional metadata associated with the retriever.
+
     This metadata will be associated with each call to this retriever,
     and passed as arguments to the handlers defined in `callbacks`.
+
     You can use these to eg identify a specific instance of a retriever with its
     use case.
     """

libs/core/langchain_core/runnables/base.py

@@ -118,6 +118,8 @@ if TYPE_CHECKING:
 
 Other = TypeVar("Other")
 
+_RUNNABLE_GENERIC_NUM_ARGS = 2  # Input and Output
+
 
 class Runnable(ABC, Generic[Input, Output]):
     """A unit of work that can be invoked, batched, streamed, transformed and composed.
@@ -147,11 +149,11 @@ class Runnable(ABC, Generic[Input, Output]):
     the `input_schema` property, the `output_schema` property and `config_schema`
     method.
 
-    LCEL and Composition
-    ====================
+    Composition
+    ===========
+
+    Runnable objects can be composed together to create chains in a declarative way.
 
-    The LangChain Expression Language (LCEL) is a declarative way to compose
-    `Runnable` objectsinto chains.
     Any chain constructed this way will automatically have sync, async, batch, and
     streaming support.
 
@@ -235,21 +237,21 @@ class Runnable(ABC, Generic[Input, Output]):
 
     You can set the global debug flag to True to enable debug output for all chains:
 
-        ```python
-        from langchain_core.globals import set_debug
+    ```python
+    from langchain_core.globals import set_debug
 
-        set_debug(True)
-        ```
+    set_debug(True)
+    ```
 
     Alternatively, you can pass existing or custom callbacks to any given chain:
 
-        ```python
-        from langchain_core.tracers import ConsoleCallbackHandler
+    ```python
+    from langchain_core.tracers import ConsoleCallbackHandler
 
-        chain.invoke(..., config={"callbacks": [ConsoleCallbackHandler()]})
-        ```
+    chain.invoke(..., config={"callbacks": [ConsoleCallbackHandler()]})
+    ```
 
-    For a UI (and much more) checkout [LangSmith](https://docs.smith.langchain.com/).
+    For a UI (and much more) checkout [LangSmith](https://docs.langchain.com/langsmith/home).
 
     """
 
@@ -309,7 +311,10 @@ class Runnable(ABC, Generic[Input, Output]):
         for base in self.__class__.mro():
             if hasattr(base, "__pydantic_generic_metadata__"):
                 metadata = base.__pydantic_generic_metadata__
-                if "args" in metadata and len(metadata["args"]) == 2:
+                if (
+                    "args" in metadata
+                    and len(metadata["args"]) == _RUNNABLE_GENERIC_NUM_ARGS
+                ):
                     return metadata["args"][0]
 
         # If we didn't find a Pydantic model in the parent classes,
@@ -317,7 +322,7 @@ class Runnable(ABC, Generic[Input, Output]):
         # Runnables that are not pydantic models.
         for cls in self.__class__.__orig_bases__:  # type: ignore[attr-defined]
             type_args = get_args(cls)
-            if type_args and len(type_args) == 2:
+            if type_args and len(type_args) == _RUNNABLE_GENERIC_NUM_ARGS:
                 return type_args[0]
 
         msg = (
@@ -340,12 +345,15 @@ class Runnable(ABC, Generic[Input, Output]):
         for base in self.__class__.mro():
             if hasattr(base, "__pydantic_generic_metadata__"):
                 metadata = base.__pydantic_generic_metadata__
-                if "args" in metadata and len(metadata["args"]) == 2:
+                if (
+                    "args" in metadata
+                    and len(metadata["args"]) == _RUNNABLE_GENERIC_NUM_ARGS
+                ):
                     return metadata["args"][1]
 
         for cls in self.__class__.__orig_bases__:  # type: ignore[attr-defined]
             type_args = get_args(cls)
-            if type_args and len(type_args) == 2:
+            if type_args and len(type_args) == _RUNNABLE_GENERIC_NUM_ARGS:
                 return type_args[1]
 
         msg = (
@@ -424,7 +432,7 @@ class Runnable(ABC, Generic[Input, Output]):
             print(runnable.get_input_jsonschema())
             ```
 
-        !!! version-added "Added in version 0.3.0"
+        !!! version-added "Added in `langchain-core` 0.3.0"
 
         """
         return self.get_input_schema(config).model_json_schema()
@@ -502,7 +510,7 @@ class Runnable(ABC, Generic[Input, Output]):
             print(runnable.get_output_jsonschema())
             ```
 
-        !!! version-added "Added in version 0.3.0"
+        !!! version-added "Added in `langchain-core` 0.3.0"
 
         """
         return self.get_output_schema(config).model_json_schema()
@@ -566,7 +574,7 @@ class Runnable(ABC, Generic[Input, Output]):
         Returns:
             A JSON schema that represents the config of the `Runnable`.
 
-        !!! version-added "Added in version 0.3.0"
+        !!! version-added "Added in `langchain-core` 0.3.0"
 
         """
         return self.config_schema(include=include).model_json_schema()
@@ -766,7 +774,7 @@ class Runnable(ABC, Generic[Input, Output]):
         """Assigns new fields to the `dict` output of this `Runnable`.
 
         ```python
-        from langchain_community.llms.fake import FakeStreamingListLLM
+        from langchain_core.language_models.fake import FakeStreamingListLLM
         from langchain_core.output_parsers import StrOutputParser
         from langchain_core.prompts import SystemMessagePromptTemplate
         from langchain_core.runnables import Runnable
@@ -818,10 +826,12 @@ class Runnable(ABC, Generic[Input, Output]):
         Args:
             input: The input to the `Runnable`.
             config: A config to use when invoking the `Runnable`.
+
                 The config supports standard keys like `'tags'`, `'metadata'` for
                 tracing purposes, `'max_concurrency'` for controlling how much work to
-                do in parallel, and other keys. Please refer to the `RunnableConfig`
-                for more details.
+                do in parallel, and other keys.
+
+                Please refer to `RunnableConfig` for more details.
 
         Returns:
             The output of the `Runnable`.
@@ -838,10 +848,12 @@ class Runnable(ABC, Generic[Input, Output]):
         Args:
             input: The input to the `Runnable`.
             config: A config to use when invoking the `Runnable`.
+
                 The config supports standard keys like `'tags'`, `'metadata'` for
                 tracing purposes, `'max_concurrency'` for controlling how much work to
-                do in parallel, and other keys. Please refer to the `RunnableConfig`
-                for more details.
+                do in parallel, and other keys.
+
+                Please refer to `RunnableConfig` for more details.
 
         Returns:
             The output of the `Runnable`.
@@ -868,8 +880,9 @@ class Runnable(ABC, Generic[Input, Output]):
             config: A config to use when invoking the `Runnable`. The config supports
                 standard keys like `'tags'`, `'metadata'` for
                 tracing purposes, `'max_concurrency'` for controlling how much work
-                to do in parallel, and other keys. Please refer to the
-                `RunnableConfig` for more details.
+                to do in parallel, and other keys.
+
+                Please refer to `RunnableConfig` for more details.
             return_exceptions: Whether to return exceptions instead of raising them.
             **kwargs: Additional keyword arguments to pass to the `Runnable`.
 
@@ -932,10 +945,12 @@ class Runnable(ABC, Generic[Input, Output]):
         Args:
             inputs: A list of inputs to the `Runnable`.
             config: A config to use when invoking the `Runnable`.
+
                 The config supports standard keys like `'tags'`, `'metadata'` for
                 tracing purposes, `'max_concurrency'` for controlling how much work to
-                do in parallel, and other keys. Please refer to the `RunnableConfig`
-                for more details.
+                do in parallel, and other keys.
+
+                Please refer to `RunnableConfig` for more details.
             return_exceptions: Whether to return exceptions instead of raising them.
             **kwargs: Additional keyword arguments to pass to the `Runnable`.
 
@@ -998,10 +1013,12 @@ class Runnable(ABC, Generic[Input, Output]):
         Args:
             inputs: A list of inputs to the `Runnable`.
             config: A config to use when invoking the `Runnable`.
+
                 The config supports standard keys like `'tags'`, `'metadata'` for
                 tracing purposes, `'max_concurrency'` for controlling how much work to
-                do in parallel, and other keys. Please refer to the `RunnableConfig`
-                for more details.
+                do in parallel, and other keys.
+
+                Please refer to `RunnableConfig` for more details.
             return_exceptions: Whether to return exceptions instead of raising them.
             **kwargs: Additional keyword arguments to pass to the `Runnable`.
 
@@ -1061,10 +1078,12 @@ class Runnable(ABC, Generic[Input, Output]):
         Args:
             inputs: A list of inputs to the `Runnable`.
             config: A config to use when invoking the `Runnable`.
+
                 The config supports standard keys like `'tags'`, `'metadata'` for
                 tracing purposes, `'max_concurrency'` for controlling how much work to
-                do in parallel, and other keys. Please refer to the `RunnableConfig`
-                for more details.
+                do in parallel, and other keys.
+
+                Please refer to `RunnableConfig` for more details.
             return_exceptions: Whether to return exceptions instead of raising them.
             **kwargs: Additional keyword arguments to pass to the `Runnable`.
 
@@ -1742,46 +1761,52 @@ class Runnable(ABC, Generic[Input, Output]):
             import time
             import asyncio
 
+
             def format_t(timestamp: float) -> str:
                 return datetime.fromtimestamp(timestamp, tz=timezone.utc).isoformat()
 
+
             async def test_runnable(time_to_sleep: int):
                 print(f"Runnable[{time_to_sleep}s]: starts at {format_t(time.time())}")
                 await asyncio.sleep(time_to_sleep)
                 print(f"Runnable[{time_to_sleep}s]: ends at {format_t(time.time())}")
 
+
             async def fn_start(run_obj: Runnable):
                 print(f"on start callback starts at {format_t(time.time())}")
                 await asyncio.sleep(3)
                 print(f"on start callback ends at {format_t(time.time())}")
 
+
             async def fn_end(run_obj: Runnable):
                 print(f"on end callback starts at {format_t(time.time())}")
                 await asyncio.sleep(2)
                 print(f"on end callback ends at {format_t(time.time())}")
 
+
             runnable = RunnableLambda(test_runnable).with_alisteners(
-                on_start=fn_start,
-                on_end=fn_end
+                on_start=fn_start, on_end=fn_end
             )
+
+
             async def concurrent_runs():
                 await asyncio.gather(runnable.ainvoke(2), runnable.ainvoke(3))
 
-            asyncio.run(concurrent_runs())
-            Result:
-            on start callback starts at 2025-03-01T07:05:22.875378+00:00
-            on start callback starts at 2025-03-01T07:05:22.875495+00:00
-            on start callback ends at 2025-03-01T07:05:25.878862+00:00
-            on start callback ends at 2025-03-01T07:05:25.878947+00:00
-            Runnable[2s]: starts at 2025-03-01T07:05:25.879392+00:00
-            Runnable[3s]: starts at 2025-03-01T07:05:25.879804+00:00
-            Runnable[2s]: ends at 2025-03-01T07:05:27.881998+00:00
-            on end callback starts at 2025-03-01T07:05:27.882360+00:00
-            Runnable[3s]: ends at 2025-03-01T07:05:28.881737+00:00
-            on end callback starts at 2025-03-01T07:05:28.882428+00:00
-            on end callback ends at 2025-03-01T07:05:29.883893+00:00
-            on end callback ends at 2025-03-01T07:05:30.884831+00:00
 
+            asyncio.run(concurrent_runs())
+            # Result:
+            # on start callback starts at 2025-03-01T07:05:22.875378+00:00
+            # on start callback starts at 2025-03-01T07:05:22.875495+00:00
+            # on start callback ends at 2025-03-01T07:05:25.878862+00:00
+            # on start callback ends at 2025-03-01T07:05:25.878947+00:00
+            # Runnable[2s]: starts at 2025-03-01T07:05:25.879392+00:00
+            # Runnable[3s]: starts at 2025-03-01T07:05:25.879804+00:00
+            # Runnable[2s]: ends at 2025-03-01T07:05:27.881998+00:00
+            # on end callback starts at 2025-03-01T07:05:27.882360+00:00
+            # Runnable[3s]: ends at 2025-03-01T07:05:28.881737+00:00
+            # on end callback starts at 2025-03-01T07:05:28.882428+00:00
+            # on end callback ends at 2025-03-01T07:05:29.883893+00:00
+            # on end callback ends at 2025-03-01T07:05:30.884831+00:00
             ```
         """
         return RunnableBinding(
@@ -1843,7 +1868,7 @@ class Runnable(ABC, Generic[Input, Output]):
                 `exp_base`, and `jitter` (all `float` values).
 
         Returns:
-            A new Runnable that retries the original Runnable on exceptions.
+            A new `Runnable` that retries the original `Runnable` on exceptions.
 
         Example:
             ```python
@@ -1927,7 +1952,9 @@ class Runnable(ABC, Generic[Input, Output]):
             exceptions_to_handle: A tuple of exception types to handle.
             exception_key: If `string` is specified then handled exceptions will be
                 passed to fallbacks as part of the input under the specified key.
+
                 If `None`, exceptions will not be passed to fallbacks.
+
                 If used, the base `Runnable` and its fallbacks must accept a
                 dictionary as input.
 
@@ -1963,7 +1990,9 @@ class Runnable(ABC, Generic[Input, Output]):
             exceptions_to_handle: A tuple of exception types to handle.
             exception_key: If `string` is specified then handled exceptions will be
                 passed to fallbacks as part of the input under the specified key.
+
                 If `None`, exceptions will not be passed to fallbacks.
+
                 If used, the base `Runnable` and its fallbacks must accept a
                 dictionary as input.
 
@@ -2429,10 +2458,14 @@ class Runnable(ABC, Generic[Input, Output]):
 
         `as_tool` will instantiate a `BaseTool` with a name, description, and
         `args_schema` from a `Runnable`. Where possible, schemas are inferred
-        from `runnable.get_input_schema`. Alternatively (e.g., if the
-        `Runnable` takes a dict as input and the specific dict keys are not typed),
-        the schema can be specified directly with `args_schema`. You can also
-        pass `arg_types` to just specify the required arguments and their types.
+        from `runnable.get_input_schema`.
+
+        Alternatively (e.g., if the `Runnable` takes a dict as input and the specific
+        `dict` keys are not typed), the schema can be specified directly with
+        `args_schema`.
+
+        You can also pass `arg_types` to just specify the required arguments and their
+        types.
 
         Args:
             args_schema: The schema for the tool.
@@ -2501,7 +2534,7 @@ class Runnable(ABC, Generic[Input, Output]):
         as_tool.invoke({"a": 3, "b": [1, 2]})
         ```
 
-        String input:
+        `str` input:
 
         ```python
         from langchain_core.runnables import RunnableLambda
@@ -2519,9 +2552,6 @@ class Runnable(ABC, Generic[Input, Output]):
         as_tool = runnable.as_tool()
         as_tool.invoke("b")
         ```
-
-        !!! version-added "Added in version 0.2.14"
-
         """
         # Avoid circular import
         from langchain_core.tools import convert_runnable_to_tool  # noqa: PLC0415
@@ -2640,7 +2670,7 @@ class RunnableSerializable(Serializable, Runnable[Input, Output]):
         from langchain_openai import ChatOpenAI
 
         model = ChatAnthropic(
-            model_name="claude-3-7-sonnet-20250219"
+            model_name="claude-sonnet-4-5-20250929"
         ).configurable_alternatives(
             ConfigurableField(id="llm"),
             default_key="anthropic",
@@ -2753,6 +2783,9 @@ def _seq_output_schema(
     return last.get_output_schema(config)
 
 
+_RUNNABLE_SEQUENCE_MIN_STEPS = 2
+
+
 class RunnableSequence(RunnableSerializable[Input, Output]):
     """Sequence of `Runnable` objects, where the output of one is the input of the next.
 
@@ -2862,7 +2895,7 @@ class RunnableSequence(RunnableSerializable[Input, Output]):
             name: The name of the `Runnable`.
             first: The first `Runnable` in the sequence.
             middle: The middle `Runnable` objects in the sequence.
-            last: The last Runnable in the sequence.
+            last: The last `Runnable` in the sequence.
 
         Raises:
             ValueError: If the sequence has less than 2 steps.
@@ -2875,8 +2908,11 @@ class RunnableSequence(RunnableSerializable[Input, Output]):
                 steps_flat.extend(step.steps)
             else:
                 steps_flat.append(coerce_to_runnable(step))
-        if len(steps_flat) < 2:
-            msg = f"RunnableSequence must have at least 2 steps, got {len(steps_flat)}"
+        if len(steps_flat) < _RUNNABLE_SEQUENCE_MIN_STEPS:
+            msg = (
+                f"RunnableSequence must have at least {_RUNNABLE_SEQUENCE_MIN_STEPS} "
+                f"steps, got {len(steps_flat)}"
+            )
             raise ValueError(msg)
         super().__init__(
             first=steps_flat[0],
@@ -2907,7 +2943,7 @@ class RunnableSequence(RunnableSerializable[Input, Output]):
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     model_config = ConfigDict(
@@ -3503,7 +3539,7 @@ class RunnableParallel(RunnableSerializable[Input, dict[str, Any]]):
 
     Returns a mapping of their outputs.
 
-    `RunnableParallel` is one of the two main composition primitives for the LCEL,
+    `RunnableParallel` is one of the two main composition primitives,
     alongside `RunnableSequence`. It invokes `Runnable`s concurrently, providing the
     same input to each.
 
@@ -3613,7 +3649,7 @@ class RunnableParallel(RunnableSerializable[Input, dict[str, Any]]):
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -3671,6 +3707,12 @@ class RunnableParallel(RunnableSerializable[Input, dict[str, Any]]):
             == "object"
             for s in self.steps__.values()
         ):
+            for step in self.steps__.values():
+                fields = step.get_input_schema(config).model_fields
+                root_field = fields.get("root")
+                if root_field is not None and root_field.annotation != Any:
+                    return super().get_input_schema(config)
+
             # This is correct, but pydantic typings/mypy don't think so.
             return create_model_v2(
                 self.get_name("Input"),
@@ -4480,7 +4522,7 @@ class RunnableLambda(Runnable[Input, Output]):
             # on itemgetter objects, so we have to parse the repr
             items = str(func).replace("operator.itemgetter(", "")[:-1].split(", ")
             if all(
-                item[0] == "'" and item[-1] == "'" and len(item) > 2 for item in items
+                item[0] == "'" and item[-1] == "'" and item != "''" for item in items
             ):
                 fields = {item[1:-1]: (Any, ...) for item in items}
                 # It's a dict, lol
@@ -5142,7 +5184,7 @@ class RunnableEachBase(RunnableSerializable[list[Input], list[Output]]):
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -5325,7 +5367,7 @@ class RunnableEach(RunnableEachBase[Input, Output]):
 
 
 class RunnableBindingBase(RunnableSerializable[Input, Output]):  # type: ignore[no-redef]
-    """`Runnable` that delegates calls to another `Runnable` with a set of kwargs.
+    """`Runnable` that delegates calls to another `Runnable` with a set of `**kwargs`.
 
     Use only if creating a new `RunnableBinding` subclass with different `__init__`
     args.
@@ -5465,7 +5507,7 @@ class RunnableBindingBase(RunnableSerializable[Input, Output]):  # type: ignore[
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -5755,7 +5797,7 @@ class RunnableBinding(RunnableBindingBase[Input, Output]):  # type: ignore[no-re
         ```python
         # Create a Runnable binding that invokes the chat model with the
         # additional kwarg `stop=['-']` when running it.
-        from langchain_community.chat_models import ChatOpenAI
+        from langchain_openai import ChatOpenAI
 
         model = ChatOpenAI()
         model.invoke('Say "Parrot-MAGIC"', stop=["-"])  # Should return `Parrot`

libs/core/langchain_core/runnables/branch.py

@@ -36,17 +36,19 @@ from langchain_core.runnables.utils import (
     get_unique_config_specs,
 )
 
+_MIN_BRANCHES = 2
+
 
 class RunnableBranch(RunnableSerializable[Input, Output]):
-    """Runnable that selects which branch to run based on a condition.
+    """`Runnable` that selects which branch to run based on a condition.
 
-    The Runnable is initialized with a list of (condition, Runnable) pairs and
+    The `Runnable` is initialized with a list of `(condition, Runnable)` pairs and
     a default branch.
 
     When operating on an input, the first condition that evaluates to True is
-    selected, and the corresponding Runnable is run on the input.
+    selected, and the corresponding `Runnable` is run on the input.
 
-    If no condition evaluates to True, the default branch is run on the input.
+    If no condition evaluates to `True`, the default branch is run on the input.
 
     Examples:
         ```python
@@ -65,9 +67,9 @@ class RunnableBranch(RunnableSerializable[Input, Output]):
     """
 
     branches: Sequence[tuple[Runnable[Input, bool], Runnable[Input, Output]]]
-    """A list of (condition, Runnable) pairs."""
+    """A list of `(condition, Runnable)` pairs."""
     default: Runnable[Input, Output]
-    """A Runnable to run if no condition is met."""
+    """A `Runnable` to run if no condition is met."""
 
     def __init__(
         self,
@@ -79,19 +81,19 @@ class RunnableBranch(RunnableSerializable[Input, Output]):
         ]
         | RunnableLike,
     ) -> None:
-        """A Runnable that runs one of two branches based on a condition.
+        """A `Runnable` that runs one of two branches based on a condition.
 
         Args:
-            *branches: A list of (condition, Runnable) pairs.
-                Defaults a Runnable to run if no condition is met.
+            *branches: A list of `(condition, Runnable)` pairs.
+                Defaults a `Runnable` to run if no condition is met.
 
         Raises:
-            ValueError: If the number of branches is less than 2.
-            TypeError: If the default branch is not Runnable, Callable or Mapping.
-            TypeError: If a branch is not a tuple or list.
-            ValueError: If a branch is not of length 2.
+            ValueError: If the number of branches is less than `2`.
+            TypeError: If the default branch is not `Runnable`, `Callable` or `Mapping`.
+            TypeError: If a branch is not a `tuple` or `list`.
+            ValueError: If a branch is not of length `2`.
         """
-        if len(branches) < 2:
+        if len(branches) < _MIN_BRANCHES:
             msg = "RunnableBranch requires at least two branches"
             raise ValueError(msg)
 
@@ -118,7 +120,7 @@ class RunnableBranch(RunnableSerializable[Input, Output]):
                 )
                 raise TypeError(msg)
 
-            if len(branch) != 2:
+            if len(branch) != _MIN_BRANCHES:
                 msg = (
                     f"RunnableBranch branches must be "
                     f"tuples or lists of length 2, not {len(branch)}"
@@ -140,7 +142,7 @@ class RunnableBranch(RunnableSerializable[Input, Output]):
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -187,12 +189,12 @@ class RunnableBranch(RunnableSerializable[Input, Output]):
     def invoke(
         self, input: Input, config: RunnableConfig | None = None, **kwargs: Any
     ) -> Output:
-        """First evaluates the condition, then delegate to true or false branch.
+        """First evaluates the condition, then delegate to `True` or `False` branch.
 
         Args:
-            input: The input to the Runnable.
-            config: The configuration for the Runnable.
-            **kwargs: Additional keyword arguments to pass to the Runnable.
+            input: The input to the `Runnable`.
+            config: The configuration for the `Runnable`.
+            **kwargs: Additional keyword arguments to pass to the `Runnable`.
 
         Returns:
             The output of the branch that was run.
@@ -297,12 +299,12 @@ class RunnableBranch(RunnableSerializable[Input, Output]):
         config: RunnableConfig | None = None,
         **kwargs: Any | None,
     ) -> Iterator[Output]:
-        """First evaluates the condition, then delegate to true or false branch.
+        """First evaluates the condition, then delegate to `True` or `False` branch.
 
         Args:
-            input: The input to the Runnable.
-            config: The configuration for the Runnable.
-            **kwargs: Additional keyword arguments to pass to the Runnable.
+            input: The input to the `Runnable`.
+            config: The configuration for the Runna`ble.
+            **kwargs: Additional keyword arguments to pass to the `Runnable`.
 
         Yields:
             The output of the branch that was run.
@@ -381,12 +383,12 @@ class RunnableBranch(RunnableSerializable[Input, Output]):
         config: RunnableConfig | None = None,
         **kwargs: Any | None,
     ) -> AsyncIterator[Output]:
-        """First evaluates the condition, then delegate to true or false branch.
+        """First evaluates the condition, then delegate to `True` or `False` branch.
 
         Args:
-            input: The input to the Runnable.
-            config: The configuration for the Runnable.
-            **kwargs: Additional keyword arguments to pass to the Runnable.
+            input: The input to the `Runnable`.
+            config: The configuration for the `Runnable`.
+            **kwargs: Additional keyword arguments to pass to the `Runnable`.
 
         Yields:
             The output of the branch that was run.

libs/core/langchain_core/runnables/configurable.py

@@ -1,4 +1,4 @@
-"""Runnables that can be dynamically configured."""
+"""`Runnable` objects that can be dynamically configured."""
 
 from __future__ import annotations
 
@@ -47,14 +47,14 @@ if TYPE_CHECKING:
 
 
 class DynamicRunnable(RunnableSerializable[Input, Output]):
-    """Serializable Runnable that can be dynamically configured.
+    """Serializable `Runnable` that can be dynamically configured.
 
-    A DynamicRunnable should be initiated using the `configurable_fields` or
-    `configurable_alternatives` method of a Runnable.
+    A `DynamicRunnable` should be initiated using the `configurable_fields` or
+    `configurable_alternatives` method of a `Runnable`.
     """
 
     default: RunnableSerializable[Input, Output]
-    """The default Runnable to use."""
+    """The default `Runnable` to use."""
 
     config: RunnableConfig | None = None
     """The configuration to use."""
@@ -66,7 +66,7 @@ class DynamicRunnable(RunnableSerializable[Input, Output]):
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -120,13 +120,13 @@ class DynamicRunnable(RunnableSerializable[Input, Output]):
     def prepare(
         self, config: RunnableConfig | None = None
     ) -> tuple[Runnable[Input, Output], RunnableConfig]:
-        """Prepare the Runnable for invocation.
+        """Prepare the `Runnable` for invocation.
 
         Args:
             config: The configuration to use.
 
         Returns:
-            The prepared Runnable and configuration.
+            The prepared `Runnable` and configuration.
         """
         runnable: Runnable[Input, Output] = self
         while isinstance(runnable, DynamicRunnable):
@@ -316,12 +316,12 @@ class DynamicRunnable(RunnableSerializable[Input, Output]):
 
 
 class RunnableConfigurableFields(DynamicRunnable[Input, Output]):
-    """Runnable that can be dynamically configured.
+    """`Runnable` that can be dynamically configured.
 
-    A RunnableConfigurableFields should be initiated using the
-    `configurable_fields` method of a Runnable.
+    A `RunnableConfigurableFields` should be initiated using the
+    `configurable_fields` method of a `Runnable`.
 
-    Here is an example of using a RunnableConfigurableFields with LLMs:
+    Here is an example of using a `RunnableConfigurableFields` with LLMs:
 
         ```python
         from langchain_core.prompts import PromptTemplate
@@ -348,7 +348,7 @@ class RunnableConfigurableFields(DynamicRunnable[Input, Output]):
         chain.invoke({"x": 0}, config={"configurable": {"temperature": 0.9}})
         ```
 
-    Here is an example of using a RunnableConfigurableFields with HubRunnables:
+    Here is an example of using a `RunnableConfigurableFields` with `HubRunnables`:
 
         ```python
         from langchain_core.prompts import PromptTemplate
@@ -380,7 +380,7 @@ class RunnableConfigurableFields(DynamicRunnable[Input, Output]):
 
     @property
     def config_specs(self) -> list[ConfigurableFieldSpec]:
-        """Get the configuration specs for the RunnableConfigurableFields.
+        """Get the configuration specs for the `RunnableConfigurableFields`.
 
         Returns:
             The configuration specs.
@@ -473,13 +473,13 @@ _enums_for_spec_lock = threading.Lock()
 
 
 class RunnableConfigurableAlternatives(DynamicRunnable[Input, Output]):
-    """Runnable that can be dynamically configured.
+    """`Runnable` that can be dynamically configured.
 
-    A RunnableConfigurableAlternatives should be initiated using the
-    `configurable_alternatives` method of a Runnable or can be
+    A `RunnableConfigurableAlternatives` should be initiated using the
+    `configurable_alternatives` method of a `Runnable` or can be
     initiated directly as well.
 
-    Here is an example of using a RunnableConfigurableAlternatives that uses
+    Here is an example of using a `RunnableConfigurableAlternatives` that uses
     alternative prompts to illustrate its functionality:
 
         ```python
@@ -506,7 +506,7 @@ class RunnableConfigurableAlternatives(DynamicRunnable[Input, Output]):
         chain.with_config(configurable={"prompt": "poem"}).invoke({"topic": "bears"})
         ```
 
-    Equivalently, you can initialize RunnableConfigurableAlternatives directly
+    Equivalently, you can initialize `RunnableConfigurableAlternatives` directly
     and use in LCEL in the same way:
 
         ```python
@@ -531,7 +531,7 @@ class RunnableConfigurableAlternatives(DynamicRunnable[Input, Output]):
     """
 
     which: ConfigurableField
-    """The ConfigurableField to use to choose between alternatives."""
+    """The `ConfigurableField` to use to choose between alternatives."""
 
     alternatives: dict[
         str,
@@ -544,8 +544,9 @@ class RunnableConfigurableAlternatives(DynamicRunnable[Input, Output]):
 
     prefix_keys: bool
     """Whether to prefix configurable fields of each alternative with a namespace
-    of the form <which.id>==<alternative_key>, eg. a key named "temperature" used by
-    the alternative named "gpt3" becomes "model==gpt3/temperature"."""
+    of the form <which.id>==<alternative_key>, e.g. a key named "temperature" used by
+    the alternative named "gpt3" becomes "model==gpt3/temperature".
+    """
 
     @property
     @override
@@ -638,24 +639,24 @@ class RunnableConfigurableAlternatives(DynamicRunnable[Input, Output]):
 
 
 def _strremoveprefix(s: str, prefix: str) -> str:
-    """str.removeprefix() is only available in Python 3.9+."""
+    """`str.removeprefix()` is only available in Python 3.9+."""
     return s.replace(prefix, "", 1) if s.startswith(prefix) else s
 
 
 def prefix_config_spec(
     spec: ConfigurableFieldSpec, prefix: str
 ) -> ConfigurableFieldSpec:
-    """Prefix the id of a ConfigurableFieldSpec.
+    """Prefix the id of a `ConfigurableFieldSpec`.
 
-    This is useful when a RunnableConfigurableAlternatives is used as a
-    ConfigurableField of another RunnableConfigurableAlternatives.
+    This is useful when a `RunnableConfigurableAlternatives` is used as a
+    `ConfigurableField` of another `RunnableConfigurableAlternatives`.
 
     Args:
-        spec: The ConfigurableFieldSpec to prefix.
+        spec: The `ConfigurableFieldSpec` to prefix.
         prefix: The prefix to add.
 
     Returns:
-        The prefixed ConfigurableFieldSpec.
+        The prefixed `ConfigurableFieldSpec`.
     """
     return (
         ConfigurableFieldSpec(
@@ -677,15 +678,15 @@ def make_options_spec(
 ) -> ConfigurableFieldSpec:
     """Make options spec.
 
-    Make a ConfigurableFieldSpec for a ConfigurableFieldSingleOption or
-    ConfigurableFieldMultiOption.
+    Make a `ConfigurableFieldSpec` for a `ConfigurableFieldSingleOption` or
+    `ConfigurableFieldMultiOption`.
 
     Args:
-        spec: The ConfigurableFieldSingleOption or ConfigurableFieldMultiOption.
+        spec: The `ConfigurableFieldSingleOption` or `ConfigurableFieldMultiOption`.
         description: The description to use if the spec does not have one.
 
     Returns:
-        The ConfigurableFieldSpec.
+        The `ConfigurableFieldSpec`.
     """
     with _enums_for_spec_lock:
         if enum := _enums_for_spec.get(spec):

libs/core/langchain_core/runnables/fallbacks.py

@@ -35,20 +35,20 @@ if TYPE_CHECKING:
 
 
 class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
-    """Runnable that can fallback to other Runnables if it fails.
+    """`Runnable` that can fallback to other `Runnable`s if it fails.
 
     External APIs (e.g., APIs for a language model) may at times experience
     degraded performance or even downtime.
 
-    In these cases, it can be useful to have a fallback Runnable that can be
-    used in place of the original Runnable (e.g., fallback to another LLM provider).
+    In these cases, it can be useful to have a fallback `Runnable` that can be
+    used in place of the original `Runnable` (e.g., fallback to another LLM provider).
 
-    Fallbacks can be defined at the level of a single Runnable, or at the level
-    of a chain of Runnables. Fallbacks are tried in order until one succeeds or
+    Fallbacks can be defined at the level of a single `Runnable`, or at the level
+    of a chain of `Runnable`s. Fallbacks are tried in order until one succeeds or
     all fail.
 
     While you can instantiate a `RunnableWithFallbacks` directly, it is usually
-    more convenient to use the `with_fallbacks` method on a Runnable.
+    more convenient to use the `with_fallbacks` method on a `Runnable`.
 
     Example:
         ```python
@@ -87,7 +87,7 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
     """
 
     runnable: Runnable[Input, Output]
-    """The Runnable to run first."""
+    """The `Runnable` to run first."""
     fallbacks: Sequence[Runnable[Input, Output]]
     """A sequence of fallbacks to try."""
     exceptions_to_handle: tuple[type[BaseException], ...] = (Exception,)
@@ -97,9 +97,12 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
     """
     exception_key: str | None = None
     """If `string` is specified then handled exceptions will be passed to fallbacks as
-        part of the input under the specified key. If `None`, exceptions
-        will not be passed to fallbacks. If used, the base Runnable and its fallbacks
-        must accept a dictionary as input."""
+    part of the input under the specified key.
+
+    If `None`, exceptions will not be passed to fallbacks.
+
+    If used, the base `Runnable` and its fallbacks must accept a dictionary as input.
+    """
 
     model_config = ConfigDict(
         arbitrary_types_allowed=True,
@@ -137,7 +140,7 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -152,10 +155,10 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
 
     @property
     def runnables(self) -> Iterator[Runnable[Input, Output]]:
-        """Iterator over the Runnable and its fallbacks.
+        """Iterator over the `Runnable` and its fallbacks.
 
         Yields:
-            The Runnable then its fallbacks.
+            The `Runnable` then its fallbacks.
         """
         yield self.runnable
         yield from self.fallbacks
@@ -589,14 +592,14 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
         await run_manager.on_chain_end(output)
 
     def __getattr__(self, name: str) -> Any:
-        """Get an attribute from the wrapped Runnable and its fallbacks.
+        """Get an attribute from the wrapped `Runnable` and its fallbacks.
 
         Returns:
-            If the attribute is anything other than a method that outputs a Runnable,
-            returns getattr(self.runnable, name). If the attribute is a method that
-            does return a new Runnable (e.g. model.bind_tools([...]) outputs a new
-            RunnableBinding) then self.runnable and each of the runnables in
-            self.fallbacks is replaced with getattr(x, name).
+            If the attribute is anything other than a method that outputs a `Runnable`,
+            returns `getattr(self.runnable, name)`. If the attribute is a method that
+            does return a new `Runnable` (e.g. `model.bind_tools([...])` outputs a new
+            `RunnableBinding`) then `self.runnable` and each of the runnables in
+            `self.fallbacks` is replaced with `getattr(x, name)`.
 
         Example:
             ```python
@@ -604,7 +607,7 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
             from langchain_anthropic import ChatAnthropic
 
             gpt_4o = ChatOpenAI(model="gpt-4o")
-            claude_3_sonnet = ChatAnthropic(model="claude-3-7-sonnet-20250219")
+            claude_3_sonnet = ChatAnthropic(model="claude-sonnet-4-5-20250929")
             model = gpt_4o.with_fallbacks([claude_3_sonnet])
 
             model.model_name
@@ -618,7 +621,6 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
                 runnable=RunnableBinding(bound=ChatOpenAI(...), kwargs={"tools": [...]}),
                 fallbacks=[RunnableBinding(bound=ChatAnthropic(...), kwargs={"tools": [...]})],
             )
-
             ```
         """  # noqa: E501
         attr = getattr(self.runnable, name)

libs/core/langchain_core/runnables/graph.py

@@ -4,7 +4,6 @@ from __future__ import annotations
 
 import inspect
 from collections import defaultdict
-from collections.abc import Callable
 from dataclasses import dataclass, field
 from enum import Enum
 from typing import (
@@ -22,7 +21,7 @@ from langchain_core.runnables.base import Runnable, RunnableSerializable
 from langchain_core.utils.pydantic import _IgnoreUnserializable, is_basemodel_subclass
 
 if TYPE_CHECKING:
-    from collections.abc import Sequence
+    from collections.abc import Callable, Sequence
 
     from pydantic import BaseModel
 
@@ -132,7 +131,7 @@ class Branch(NamedTuple):
     condition: Callable[..., str]
     """A callable that returns a string representation of the condition."""
     ends: dict[str, str] | None
-    """Optional dictionary of end node ids for the branches. """
+    """Optional dictionary of end node IDs for the branches. """
 
 
 class CurveStyle(Enum):
@@ -642,6 +641,7 @@ class Graph:
         retry_delay: float = 1.0,
         frontmatter_config: dict[str, Any] | None = None,
         base_url: str | None = None,
+        proxies: dict[str, str] | None = None,
     ) -> bytes:
         """Draw the graph as a PNG image using Mermaid.
 
@@ -674,11 +674,10 @@ class Graph:
                 }
                 ```
             base_url: The base URL of the Mermaid server for rendering via API.
-
+            proxies: HTTP/HTTPS proxies for requests (e.g. `{"http": "http://127.0.0.1:7890"}`).
 
         Returns:
             The PNG image as bytes.
-
         """
         # Import locally to prevent circular import
         from langchain_core.runnables.graph_mermaid import (  # noqa: PLC0415
@@ -699,6 +698,7 @@ class Graph:
             padding=padding,
             max_retries=max_retries,
             retry_delay=retry_delay,
+            proxies=proxies,
             base_url=base_url,
         )
 
@@ -706,8 +706,10 @@ class Graph:
 def _first_node(graph: Graph, exclude: Sequence[str] = ()) -> Node | None:
     """Find the single node that is not a target of any edge.
 
-    Exclude nodes/sources with ids in the exclude list.
+    Exclude nodes/sources with IDs in the exclude list.
+
     If there is no such node, or there are multiple, return `None`.
+
     When drawing the graph, this node would be the origin.
     """
     targets = {edge.target for edge in graph.edges if edge.source not in exclude}
@@ -722,8 +724,10 @@ def _first_node(graph: Graph, exclude: Sequence[str] = ()) -> Node | None:
 def _last_node(graph: Graph, exclude: Sequence[str] = ()) -> Node | None:
     """Find the single node that is not a source of any edge.
 
-    Exclude nodes/targets with ids in the exclude list.
+    Exclude nodes/targets with IDs in the exclude list.
+
     If there is no such node, or there are multiple, return `None`.
+
     When drawing the graph, this node would be the destination.
     """
     sources = {edge.source for edge in graph.edges if edge.target not in exclude}

libs/core/langchain_core/runnables/graph_ascii.py

@@ -7,7 +7,6 @@ from __future__ import annotations
 
 import math
 import os
-from collections.abc import Mapping, Sequence
 from typing import TYPE_CHECKING, Any
 
 try:
@@ -20,6 +19,8 @@ except ImportError:
     _HAS_GRANDALF = False
 
 if TYPE_CHECKING:
+    from collections.abc import Mapping, Sequence
+
     from langchain_core.runnables.graph import Edge as LangEdge
 
 

libs/core/langchain_core/runnables/graph_mermaid.py

@@ -281,6 +281,7 @@ def draw_mermaid_png(
     max_retries: int = 1,
     retry_delay: float = 1.0,
     base_url: str | None = None,
+    proxies: dict[str, str] | None = None,
 ) -> bytes:
     """Draws a Mermaid graph as PNG using provided syntax.
 
@@ -293,6 +294,7 @@ def draw_mermaid_png(
         max_retries: Maximum number of retries (MermaidDrawMethod.API).
         retry_delay: Delay between retries (MermaidDrawMethod.API).
         base_url: Base URL for the Mermaid.ink API.
+        proxies: HTTP/HTTPS proxies for requests (e.g. `{"http": "http://127.0.0.1:7890"}`).
 
     Returns:
         PNG image bytes.
@@ -314,6 +316,7 @@ def draw_mermaid_png(
             max_retries=max_retries,
             retry_delay=retry_delay,
             base_url=base_url,
+            proxies=proxies,
         )
     else:
         supported_methods = ", ".join([m.value for m in MermaidDrawMethod])
@@ -405,6 +408,7 @@ def _render_mermaid_using_api(
     file_type: Literal["jpeg", "png", "webp"] | None = "png",
     max_retries: int = 1,
     retry_delay: float = 1.0,
+    proxies: dict[str, str] | None = None,
     base_url: str | None = None,
 ) -> bytes:
     """Renders Mermaid graph using the Mermaid.INK API."""
@@ -445,7 +449,7 @@ def _render_mermaid_using_api(
 
     for attempt in range(max_retries + 1):
         try:
-            response = requests.get(image_url, timeout=10)
+            response = requests.get(image_url, timeout=10, proxies=proxies)
             if response.status_code == requests.codes.ok:
                 img_bytes = response.content
                 if output_file_path is not None:
@@ -454,7 +458,10 @@ def _render_mermaid_using_api(
                 return img_bytes
 
             # If we get a server error (5xx), retry
-            if 500 <= response.status_code < 600 and attempt < max_retries:
+            if (
+                requests.codes.internal_server_error <= response.status_code
+                and attempt < max_retries
+            ):
                 # Exponential backoff with jitter
                 sleep_time = retry_delay * (2**attempt) * (0.5 + 0.5 * random.random())  # noqa: S311 not used for crypto
                 time.sleep(sleep_time)

libs/core/langchain_core/runnables/graph_png.py

@@ -1,5 +1,6 @@
 """Helper class to draw a state graph into a PNG file."""
 
+from itertools import groupby
 from typing import Any
 
 from langchain_core.runnables.graph import Graph, LabelsDict
@@ -141,6 +142,7 @@ class PngDrawer:
         # Add nodes, conditional edges, and edges to the graph
         self.add_nodes(viz, graph)
         self.add_edges(viz, graph)
+        self.add_subgraph(viz, [node.split(":") for node in graph.nodes])
 
         # Update entrypoint and END styles
         self.update_styles(viz, graph)
@@ -161,6 +163,32 @@ class PngDrawer:
         for node in graph.nodes:
             self.add_node(viz, node)
 
+    def add_subgraph(
+        self,
+        viz: Any,
+        nodes: list[list[str]],
+        parent_prefix: list[str] | None = None,
+    ) -> None:
+        """Add subgraphs to the graph.
+
+        Args:
+            viz: The graphviz object.
+            nodes: The nodes to add.
+            parent_prefix: The prefix of the parent subgraph.
+        """
+        for prefix, grouped in groupby(
+            [node[:] for node in sorted(nodes)],
+            key=lambda x: x.pop(0),
+        ):
+            current_prefix = (parent_prefix or []) + [prefix]
+            grouped_nodes = list(grouped)
+            if len(grouped_nodes) > 1:
+                subgraph = viz.add_subgraph(
+                    [":".join(current_prefix + node) for node in grouped_nodes],
+                    name="cluster_" + ":".join(current_prefix),
+                )
+                self.add_subgraph(subgraph, grouped_nodes, current_prefix)
+
     def add_edges(self, viz: Any, graph: Graph) -> None:
         """Add edges to the graph.
 

libs/core/langchain_core/runnables/history.py

@@ -36,23 +36,23 @@ GetSessionHistoryCallable = Callable[..., BaseChatMessageHistory]
 
 
 class RunnableWithMessageHistory(RunnableBindingBase):  # type: ignore[no-redef]
-    """Runnable that manages chat message history for another Runnable.
+    """`Runnable` that manages chat message history for another `Runnable`.
 
     A chat message history is a sequence of messages that represent a conversation.
 
-    RunnableWithMessageHistory wraps another Runnable and manages the chat message
+    `RunnableWithMessageHistory` wraps another `Runnable` and manages the chat message
     history for it; it is responsible for reading and updating the chat message
     history.
 
-    The formats supported for the inputs and outputs of the wrapped Runnable
+    The formats supported for the inputs and outputs of the wrapped `Runnable`
     are described below.
 
-    RunnableWithMessageHistory must always be called with a config that contains
+    `RunnableWithMessageHistory` must always be called with a config that contains
     the appropriate parameters for the chat message history factory.
 
-    By default, the Runnable is expected to take a single configuration parameter
+    By default, the `Runnable` is expected to take a single configuration parameter
     called `session_id` which is a string. This parameter is used to create a new
-    or look up an existing chat message history that matches the given session_id.
+    or look up an existing chat message history that matches the given `session_id`.
 
     In this case, the invocation would look like this:
 
@@ -117,12 +117,12 @@ class RunnableWithMessageHistory(RunnableBindingBase):  # type: ignore[no-redef]
 
         ```
 
-    Example where the wrapped Runnable takes a dictionary input:
+    Example where the wrapped `Runnable` takes a dictionary input:
 
         ```python
         from typing import Optional
 
-        from langchain_community.chat_models import ChatAnthropic
+        from langchain_anthropic import ChatAnthropic
         from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
         from langchain_core.runnables.history import RunnableWithMessageHistory
 
@@ -166,7 +166,7 @@ class RunnableWithMessageHistory(RunnableBindingBase):  # type: ignore[no-redef]
         print(store)  # noqa: T201
         ```
 
-    Example where the session factory takes two keys, user_id and conversation id):
+    Example where the session factory takes two keys (`user_id` and `conversation_id`):
 
         ```python
         store = {}
@@ -223,21 +223,28 @@ class RunnableWithMessageHistory(RunnableBindingBase):  # type: ignore[no-redef]
     """
 
     get_session_history: GetSessionHistoryCallable
-    """Function that returns a new BaseChatMessageHistory.
+    """Function that returns a new `BaseChatMessageHistory`.
+
     This function should either take a single positional argument `session_id` of type
-    string and return a corresponding chat message history instance"""
+    string and return a corresponding chat message history instance
+    """
     input_messages_key: str | None = None
-    """Must be specified if the base runnable accepts a dict as input.
-    The key in the input dict that contains the messages."""
+    """Must be specified if the base `Runnable` accepts a `dict` as input.
+    The key in the input `dict` that contains the messages.
+    """
     output_messages_key: str | None = None
-    """Must be specified if the base Runnable returns a dict as output.
-    The key in the output dict that contains the messages."""
+    """Must be specified if the base `Runnable` returns a `dict` as output.
+    The key in the output `dict` that contains the messages.
+    """
     history_messages_key: str | None = None
-    """Must be specified if the base runnable accepts a dict as input and expects a
-    separate key for historical messages."""
+    """Must be specified if the base `Runnable` accepts a `dict` as input and expects a
+    separate key for historical messages.
+    """
     history_factory_config: Sequence[ConfigurableFieldSpec]
     """Configure fields that should be passed to the chat history factory.
-    See `ConfigurableFieldSpec` for more details."""
+
+    See `ConfigurableFieldSpec` for more details.
+    """
 
     def __init__(
         self,
@@ -254,15 +261,16 @@ class RunnableWithMessageHistory(RunnableBindingBase):  # type: ignore[no-redef]
         history_factory_config: Sequence[ConfigurableFieldSpec] | None = None,
         **kwargs: Any,
     ) -> None:
-        """Initialize RunnableWithMessageHistory.
+        """Initialize `RunnableWithMessageHistory`.
 
         Args:
-            runnable: The base Runnable to be wrapped.
+            runnable: The base `Runnable` to be wrapped.
+
                 Must take as input one of:
 
                 1. A list of `BaseMessage`
-                2. A dict with one key for all messages
-                3. A dict with one key for the current input string/message(s) and
+                2. A `dict` with one key for all messages
+                3. A `dict` with one key for the current input string/message(s) and
                     a separate key for historical messages. If the input key points
                     to a string, it will be treated as a `HumanMessage` in history.
 
@@ -270,13 +278,15 @@ class RunnableWithMessageHistory(RunnableBindingBase):  # type: ignore[no-redef]
 
                 1. A string which can be treated as an `AIMessage`
                 2. A `BaseMessage` or sequence of `BaseMessage`
-                3. A dict with a key for a `BaseMessage` or sequence of
+                3. A `dict` with a key for a `BaseMessage` or sequence of
                     `BaseMessage`
 
-            get_session_history: Function that returns a new BaseChatMessageHistory.
+            get_session_history: Function that returns a new `BaseChatMessageHistory`.
+
                 This function should either take a single positional argument
                 `session_id` of type string and return a corresponding
                 chat message history instance.
+
                 ```python
                 def get_session_history(
                     session_id: str, *, user_id: str | None = None
@@ -295,16 +305,17 @@ class RunnableWithMessageHistory(RunnableBindingBase):  # type: ignore[no-redef]
                 ) -> BaseChatMessageHistory: ...
                 ```
 
-            input_messages_key: Must be specified if the base runnable accepts a dict
+            input_messages_key: Must be specified if the base runnable accepts a `dict`
                 as input.
-            output_messages_key: Must be specified if the base runnable returns a dict
+            output_messages_key: Must be specified if the base runnable returns a `dict`
                 as output.
-            history_messages_key: Must be specified if the base runnable accepts a dict
-                as input and expects a separate key for historical messages.
+            history_messages_key: Must be specified if the base runnable accepts a
+                `dict` as input and expects a separate key for historical messages.
             history_factory_config: Configure fields that should be passed to the
                 chat history factory. See `ConfigurableFieldSpec` for more details.
-                Specifying these allows you to pass multiple config keys
-                into the get_session_history factory.
+
+                Specifying these allows you to pass multiple config keys into the
+                `get_session_history` factory.
             **kwargs: Arbitrary additional kwargs to pass to parent class
                 `RunnableBindingBase` init.
 
@@ -364,7 +375,7 @@ class RunnableWithMessageHistory(RunnableBindingBase):  # type: ignore[no-redef]
     @property
     @override
     def config_specs(self) -> list[ConfigurableFieldSpec]:
-        """Get the configuration specs for the RunnableWithMessageHistory."""
+        """Get the configuration specs for the `RunnableWithMessageHistory`."""
         return get_unique_config_specs(
             super().config_specs + list(self.history_factory_config)
         )
@@ -606,6 +617,6 @@ class RunnableWithMessageHistory(RunnableBindingBase):  # type: ignore[no-redef]
 
 
 def _get_parameter_names(callable_: GetSessionHistoryCallable) -> list[str]:
-    """Get the parameter names of the callable."""
+    """Get the parameter names of the `Callable`."""
     sig = inspect.signature(callable_)
     return list(sig.parameters.keys())

libs/core/langchain_core/runnables/passthrough.py

@@ -51,10 +51,10 @@ def identity(x: Other) -> Other:
     """Identity function.
 
     Args:
-        x: input.
+        x: Input.
 
     Returns:
-        output.
+        Output.
     """
     return x
 
@@ -63,10 +63,10 @@ async def aidentity(x: Other) -> Other:
     """Async identity function.
 
     Args:
-        x: input.
+        x: Input.
 
     Returns:
-        output.
+        Output.
     """
     return x
 
@@ -74,11 +74,11 @@ async def aidentity(x: Other) -> Other:
 class RunnablePassthrough(RunnableSerializable[Other, Other]):
     """Runnable to passthrough inputs unchanged or with additional keys.
 
-    This Runnable behaves almost like the identity function, except that it
+    This `Runnable` behaves almost like the identity function, except that it
     can be configured to add additional keys to the output, if the input is a
     dict.
 
-    The examples below demonstrate this Runnable works using a few simple
+    The examples below demonstrate this `Runnable` works using a few simple
     chains. The chains rely on simple lambdas to make the examples easy to execute
     and experiment with.
 
@@ -164,7 +164,7 @@ class RunnablePassthrough(RunnableSerializable[Other, Other]):
         input_type: type[Other] | None = None,
         **kwargs: Any,
     ) -> None:
-        """Create e RunnablePassthrough.
+        """Create a `RunnablePassthrough`.
 
         Args:
             func: Function to be called with the input.
@@ -180,7 +180,7 @@ class RunnablePassthrough(RunnableSerializable[Other, Other]):
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -213,11 +213,11 @@ class RunnablePassthrough(RunnableSerializable[Other, Other]):
         """Merge the Dict input with the output produced by the mapping argument.
 
         Args:
-            **kwargs: Runnable, Callable or a Mapping from keys to Runnables
-                or Callables.
+            **kwargs: `Runnable`, `Callable` or a `Mapping` from keys to `Runnable`
+                objects or `Callable`s.
 
         Returns:
-            A Runnable that merges the Dict input with the output produced by the
+            A `Runnable` that merges the `dict` input with the output produced by the
             mapping argument.
         """
         return RunnableAssign(RunnableParallel[dict[str, Any]](kwargs))
@@ -350,7 +350,7 @@ _graph_passthrough: RunnablePassthrough = RunnablePassthrough()
 
 
 class RunnableAssign(RunnableSerializable[dict[str, Any], dict[str, Any]]):
-    """Runnable that assigns key-value pairs to dict[str, Any] inputs.
+    """Runnable that assigns key-value pairs to `dict[str, Any]` inputs.
 
     The `RunnableAssign` class takes input dictionaries and, through a
     `RunnableParallel` instance, applies transformations, then combines
@@ -392,7 +392,7 @@ class RunnableAssign(RunnableSerializable[dict[str, Any], dict[str, Any]]):
     mapper: RunnableParallel
 
     def __init__(self, mapper: RunnableParallel[dict[str, Any]], **kwargs: Any) -> None:
-        """Create a RunnableAssign.
+        """Create a `RunnableAssign`.
 
         Args:
             mapper: A `RunnableParallel` instance that will be used to transform the
@@ -403,7 +403,7 @@ class RunnableAssign(RunnableSerializable[dict[str, Any], dict[str, Any]]):
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod
@@ -668,13 +668,19 @@ class RunnableAssign(RunnableSerializable[dict[str, Any], dict[str, Any]]):
             yield chunk
 
 
-class RunnablePick(RunnableSerializable[dict[str, Any], dict[str, Any]]):
-    """Runnable that picks keys from dict[str, Any] inputs.
+class RunnablePick(RunnableSerializable[dict[str, Any], Any]):
+    """`Runnable` that picks keys from `dict[str, Any]` inputs.
 
-    RunnablePick class represents a Runnable that selectively picks keys from a
+    `RunnablePick` class represents a `Runnable` that selectively picks keys from a
     dictionary input. It allows you to specify one or more keys to extract
-    from the input dictionary. It returns a new dictionary containing only
-    the selected keys.
+    from the input dictionary.
+
+    !!! note "Return Type Behavior"
+        The return type depends on the `keys` parameter:
+
+        - When `keys` is a `str`: Returns the single value associated with that key
+        - When `keys` is a `list`: Returns a dictionary containing only the selected
+            keys
 
     Example:
         ```python
@@ -687,18 +693,22 @@ class RunnablePick(RunnableSerializable[dict[str, Any], dict[str, Any]]):
             "country": "USA",
         }
 
-        runnable = RunnablePick(keys=["name", "age"])
+        # Single key - returns the value directly
+        runnable_single = RunnablePick(keys="name")
+        result_single = runnable_single.invoke(input_data)
+        print(result_single)  # Output: "John"
 
-        output_data = runnable.invoke(input_data)
-
-        print(output_data)  # Output: {'name': 'John', 'age': 30}
+        # Multiple keys - returns a dictionary
+        runnable_multiple = RunnablePick(keys=["name", "age"])
+        result_multiple = runnable_multiple.invoke(input_data)
+        print(result_multiple)  # Output: {'name': 'John', 'age': 30}
         ```
     """
 
     keys: str | list[str]
 
     def __init__(self, keys: str | list[str], **kwargs: Any) -> None:
-        """Create a RunnablePick.
+        """Create a `RunnablePick`.
 
         Args:
             keys: A single key or a list of keys to pick from the input dictionary.
@@ -708,7 +718,7 @@ class RunnablePick(RunnableSerializable[dict[str, Any], dict[str, Any]]):
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod

libs/core/langchain_core/runnables/router.py

@@ -40,11 +40,11 @@ class RouterInput(TypedDict):
     key: str
     """The key to route on."""
     input: Any
-    """The input to pass to the selected Runnable."""
+    """The input to pass to the selected `Runnable`."""
 
 
 class RouterRunnable(RunnableSerializable[RouterInput, Output]):
-    """Runnable that routes to a set of Runnables based on Input['key'].
+    """`Runnable` that routes to a set of `Runnable` based on `Input['key']`.
 
     Returns the output of the selected Runnable.
 
@@ -74,10 +74,10 @@ class RouterRunnable(RunnableSerializable[RouterInput, Output]):
         self,
         runnables: Mapping[str, Runnable[Any, Output] | Callable[[Any], Output]],
     ) -> None:
-        """Create a RouterRunnable.
+        """Create a `RouterRunnable`.
 
         Args:
-            runnables: A mapping of keys to Runnables.
+            runnables: A mapping of keys to `Runnable` objects.
         """
         super().__init__(
             runnables={key: coerce_to_runnable(r) for key, r in runnables.items()}
@@ -90,7 +90,7 @@ class RouterRunnable(RunnableSerializable[RouterInput, Output]):
     @classmethod
     @override
     def is_lc_serializable(cls) -> bool:
-        """Return True as this class is serializable."""
+        """Return `True` as this class is serializable."""
         return True
 
     @classmethod

libs/core/langchain_core/runnables/schema.py

@@ -28,7 +28,7 @@ class EventData(TypedDict, total=False):
 
     This field is only available if the `Runnable` raised an exception.
 
-    !!! version-added "Added in version 1.0.0"
+    !!! version-added "Added in `langchain-core` 1.0.0"
     """
     output: Any
     """The output of the `Runnable` that generated the event.
@@ -168,10 +168,7 @@ class StandardStreamEvent(BaseStreamEvent):
 
 
 class CustomStreamEvent(BaseStreamEvent):
-    """Custom stream event created by the user.
-
-    !!! version-added "Added in version 0.2.15"
-    """
+    """Custom stream event created by the user."""
 
     # Overwrite the event field to be more specific.
     event: Literal["on_custom_event"]  # type: ignore[misc]

libs/core/langchain_core/runnables/utils.py

@@ -7,8 +7,7 @@ import asyncio
 import inspect
 import sys
 import textwrap
-from collections.abc import Callable, Mapping, Sequence
-from contextvars import Context
+from collections.abc import Mapping, Sequence
 from functools import lru_cache
 from inspect import signature
 from itertools import groupby
@@ -31,9 +30,11 @@ if TYPE_CHECKING:
         AsyncIterable,
         AsyncIterator,
         Awaitable,
+        Callable,
         Coroutine,
         Iterable,
     )
+    from contextvars import Context
 
     from langchain_core.runnables.schema import StreamEvent
 

libs/core/langchain_core/stores.py

@@ -86,7 +86,7 @@ class BaseStore(ABC, Generic[K, V]):
 
         Returns:
             A sequence of optional values associated with the keys.
-            If a key is not found, the corresponding value will be None.
+            If a key is not found, the corresponding value will be `None`.
         """
 
     async def amget(self, keys: Sequence[K]) -> list[V | None]:
@@ -97,7 +97,7 @@ class BaseStore(ABC, Generic[K, V]):
 
         Returns:
             A sequence of optional values associated with the keys.
-            If a key is not found, the corresponding value will be None.
+            If a key is not found, the corresponding value will be `None`.
         """
         return await run_in_executor(None, self.mget, keys)
 
@@ -243,8 +243,7 @@ class InMemoryStore(InMemoryBaseStore[Any]):
     """In-memory store for any type of data.
 
     Attributes:
-        store (dict[str, Any]): The underlying dictionary that stores
-            the key-value pairs.
+        store: The underlying dictionary that stores the key-value pairs.
 
     Examples:
         ```python
@@ -267,8 +266,7 @@ class InMemoryByteStore(InMemoryBaseStore[bytes]):
     """In-memory store for bytes.
 
     Attributes:
-        store (dict[str, bytes]): The underlying dictionary that stores
-            the key-value pairs.
+        store: The underlying dictionary that stores the key-value pairs.
 
     Examples:
         ```python

libs/core/langchain_core/sys_info.py

@@ -125,9 +125,11 @@ def print_sys_info(*, additional_pkgs: Sequence[str] = ()) -> None:
         for dep in sub_dependencies:
             try:
                 dep_version = metadata.version(dep)
-                print(f"> {dep}: {dep_version}")
             except Exception:
-                print(f"> {dep}: Installed. No version info available.")
+                dep_version = None
+
+            if dep_version is not None:
+                print(f"> {dep}: {dep_version}")
 
 
 if __name__ == "__main__":