diff --git a/.github/workflows/_release.yml b/.github/workflows/_release.yml
index a7634740c9c..ecdb14bb932 100644
--- a/.github/workflows/_release.yml
+++ b/.github/workflows/_release.yml
@@ -141,7 +141,7 @@ jobs:
   # Runs in isolated environment with minimal permissions for security
   build:
     name: 📦 Build distribution
-    if: github.ref == 'refs/heads/master' || inputs.dangerous-nonmaster-release
+    if: github.repository_owner == 'langchain-ai' && (github.ref == 'refs/heads/master' || inputs.dangerous-nonmaster-release)
     environment: Release
     runs-on: ubuntu-latest
     permissions:
diff --git a/.github/workflows/auto-label-by-package.yml b/.github/workflows/auto-label-by-package.yml
index a62d2828edd..3e9eafc8c14 100644
--- a/.github/workflows/auto-label-by-package.yml
+++ b/.github/workflows/auto-label-by-package.yml
@@ -9,6 +9,7 @@ permissions:
 
 jobs:
   label-by-package:
+    if: github.repository_owner == 'langchain-ai'
     permissions:
       issues: write
     runs-on: ubuntu-latest
diff --git a/.github/workflows/check_agents_sync.yml b/.github/workflows/check_agents_sync.yml
index 88c5d13d030..851a33ae433 100644
--- a/.github/workflows/check_agents_sync.yml
+++ b/.github/workflows/check_agents_sync.yml
@@ -23,6 +23,7 @@ permissions:
 jobs:
   check-sync:
     name: "verify files are identical"
+    if: github.repository_owner == 'langchain-ai'
     runs-on: ubuntu-latest
     steps:
       - name: "📋 Checkout Code"
diff --git a/.github/workflows/check_diffs.yml b/.github/workflows/check_diffs.yml
index d46c3469077..949c20a47af 100644
--- a/.github/workflows/check_diffs.yml
+++ b/.github/workflows/check_diffs.yml
@@ -192,6 +192,7 @@ jobs:
   # Verify _release.yml dropdown options stay in sync with package directories
   check-release-options:
     name: "Validate Release Options"
+    if: github.repository_owner == 'langchain-ai'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v6
diff --git a/.github/workflows/check_release_deps.yml b/.github/workflows/check_release_deps.yml
index 76b70e99676..aef6b9b7615 100644
--- a/.github/workflows/check_release_deps.yml
+++ b/.github/workflows/check_release_deps.yml
@@ -44,6 +44,7 @@ jobs:
     # intra-monorepo pins ahead of a sibling release on purpose. Maintainers can
     # acknowledge an unusual coordinated release with the bypass label.
     if: >-
+      github.repository_owner == 'langchain-ai' &&
       startsWith(github.event.pull_request.title, 'release') &&
       !contains(github.event.pull_request.labels.*.name, 'release-deps: acknowledged')
     runs-on: ubuntu-latest
diff --git a/.github/workflows/check_versions.yml b/.github/workflows/check_versions.yml
index 24b2587718a..1b69843ffbb 100644
--- a/.github/workflows/check_versions.yml
+++ b/.github/workflows/check_versions.yml
@@ -19,6 +19,7 @@ permissions:
 
 jobs:
   check_version_equality:
+    if: github.repository_owner == 'langchain-ai'
     runs-on: ubuntu-latest
 
     steps:
diff --git a/.github/workflows/close_unchecked_issues.yml b/.github/workflows/close_unchecked_issues.yml
index 4c2d97f4884..b980eefb08a 100644
--- a/.github/workflows/close_unchecked_issues.yml
+++ b/.github/workflows/close_unchecked_issues.yml
@@ -29,6 +29,7 @@ concurrency:
 
 jobs:
   check-boxes:
+    if: github.repository_owner == 'langchain-ai'
     runs-on: ubuntu-latest
     permissions:
       contents: read
diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
index 9f96733004e..7140373a43b 100644
--- a/.github/workflows/codspeed.yml
+++ b/.github/workflows/codspeed.yml
@@ -29,7 +29,7 @@ jobs:
   build:
     name: "Detect Changes"
     runs-on: ubuntu-latest
-    if: ${{ !contains(github.event.pull_request.labels.*.name, 'codspeed-ignore') }}
+    if: ${{ github.repository_owner == 'langchain-ai' && !contains(github.event.pull_request.labels.*.name, 'codspeed-ignore') }}
     steps:
       - name: "📋 Checkout Code"
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v6
diff --git a/.github/workflows/pr_labeler.yml b/.github/workflows/pr_labeler.yml
index 0d904d03f3a..ff0c851cef9 100644
--- a/.github/workflows/pr_labeler.yml
+++ b/.github/workflows/pr_labeler.yml
@@ -42,6 +42,7 @@ concurrency:
 
 jobs:
   label:
+    if: github.repository_owner == 'langchain-ai'
     runs-on: ubuntu-latest
     permissions:
       contents: read
diff --git a/.github/workflows/pr_labeler_backfill.yml b/.github/workflows/pr_labeler_backfill.yml
index d064610c676..83450caf9d0 100644
--- a/.github/workflows/pr_labeler_backfill.yml
+++ b/.github/workflows/pr_labeler_backfill.yml
@@ -19,6 +19,7 @@ permissions:
 
 jobs:
   backfill:
+    if: github.repository_owner == 'langchain-ai'
     runs-on: ubuntu-latest
     permissions:
       contents: read
diff --git a/.github/workflows/remove_waiting_on_author.yml b/.github/workflows/remove_waiting_on_author.yml
index 0251efc88b3..2f19ad224bc 100644
--- a/.github/workflows/remove_waiting_on_author.yml
+++ b/.github/workflows/remove_waiting_on_author.yml
@@ -20,6 +20,7 @@ permissions:
 jobs:
   remove-label:
     if: >-
+      github.repository_owner == 'langchain-ai' &&
       github.event.issue.state == 'open' &&
       contains(github.event.issue.labels.*.name, 'waiting-on-author') &&
       github.event.comment.user.type != 'Bot' &&
diff --git a/.github/workflows/reopen_on_assignment.yml b/.github/workflows/reopen_on_assignment.yml
index a27bae145be..6799f6d3650 100644
--- a/.github/workflows/reopen_on_assignment.yml
+++ b/.github/workflows/reopen_on_assignment.yml
@@ -19,6 +19,7 @@ permissions:
 
 jobs:
   reopen-linked-prs:
+    if: github.repository_owner == 'langchain-ai'
     runs-on: ubuntu-latest
     permissions:
       actions: write
diff --git a/.github/workflows/require_issue_link.yml b/.github/workflows/require_issue_link.yml
index bf45a3df969..6ccecf2846a 100644
--- a/.github/workflows/require_issue_link.yml
+++ b/.github/workflows/require_issue_link.yml
@@ -35,6 +35,7 @@ jobs:
     # Skip entirely when the PR already carries "trusted-contributor" or
     # "bypass-issue-check".
     if: >-
+      github.repository_owner == 'langchain-ai' &&
       !contains(github.event.pull_request.labels.*.name, 'trusted-contributor') &&
       !contains(github.event.pull_request.labels.*.name, 'bypass-issue-check') &&
       (
diff --git a/.github/workflows/tag-external-issues.yml b/.github/workflows/tag-external-issues.yml
index 0425d7a9ebb..ef584b7f6d0 100644
--- a/.github/workflows/tag-external-issues.yml
+++ b/.github/workflows/tag-external-issues.yml
@@ -44,7 +44,7 @@ concurrency:
 
 jobs:
   tag-external:
-    if: github.event_name != 'workflow_dispatch'
+    if: github.repository_owner == 'langchain-ai' && github.event_name != 'workflow_dispatch'
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -112,7 +112,7 @@ jobs:
             console.log(`Added '${label}' label to issue #${issue_number}`);
 
   backfill:
-    if: github.event_name == 'workflow_dispatch'
+    if: github.repository_owner == 'langchain-ai' && github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-latest
     permissions:
       contents: read
diff --git a/.github/workflows/v03_api_doc_build.yml b/.github/workflows/v03_api_doc_build.yml
deleted file mode 100644
index b514a50c64e..00000000000
--- a/.github/workflows/v03_api_doc_build.yml
+++ /dev/null
@@ -1,167 +0,0 @@
-# Build the API reference documentation for v0.3 branch.
-#
-# Manual trigger only.
-#
-# Built HTML pushed to langchain-ai/langchain-api-docs-html.
-#
-# Looks for langchain-ai org repos in packages.yml and checks them out.
-# Calls prep_api_docs_build.py.
-
-name: "📚 API Docs (v0.3)"
-run-name: "Build & Deploy API Reference (v0.3)"
-
-on:
-  workflow_dispatch:
-
-permissions:
-  contents: read
-
-env:
-  PYTHON_VERSION: "3.11"
-
-jobs:
-  build:
-    if: github.repository == 'langchain-ai/langchain' || github.event_name != 'schedule'
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v6
-        with:
-          ref: v0.3
-          path: langchain
-
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v6
-        with:
-          repository: langchain-ai/langchain-api-docs-html
-          path: langchain-api-docs-html
-          token: ${{ secrets.TOKEN_GITHUB_API_DOCS_HTML }}
-
-      - name: "📋 Extract Repository List with yq"
-        id: get-unsorted-repos
-        uses: mikefarah/yq@e2f1d5ccf73239195bf92280cd47596751492449 # master
-        with:
-          cmd: |
-            # Extract repos from packages.yml that are in the langchain-ai org
-            # (excluding 'langchain' itself)
-            yq '
-              .packages[]
-              | select(
-                  (
-                    (.repo | test("^langchain-ai/"))
-                    and
-                    (.repo != "langchain-ai/langchain")
-                  )
-                  or
-                  (.include_in_api_ref // false)
-                )
-              | .repo
-            ' langchain/libs/packages.yml
-
-      - name: "📋 Parse YAML & Checkout Repositories"
-        env:
-          REPOS_UNSORTED: ${{ steps.get-unsorted-repos.outputs.result }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          # Get unique repositories
-          REPOS=$(echo "$REPOS_UNSORTED" | sort -u)
-          # Checkout each unique repository
-          for repo in $REPOS; do
-            # Validate repository format (allow any org with proper format)
-            if [[ ! "$repo" =~ ^[a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+$ ]]; then
-              echo "Error: Invalid repository format: $repo"
-              exit 1
-            fi
-
-            REPO_NAME=$(echo $repo | cut -d'/' -f2)
-
-            # Additional validation for repo name
-            if [[ ! "$REPO_NAME" =~ ^[a-zA-Z0-9_.-]+$ ]]; then
-              echo "Error: Invalid repository name: $REPO_NAME"
-              exit 1
-            fi
-            echo "Checking out $repo to $REPO_NAME"
-
-            # Special handling for langchain-tavily: checkout by commit hash
-            if [[ "$REPO_NAME" == "langchain-tavily" ]]; then
-              git clone https://github.com/$repo.git $REPO_NAME
-              cd $REPO_NAME
-              git checkout f3515654724a9e87bdfe2c2f509d6cdde646e563
-              cd ..
-            else
-              git clone --depth 1 --branch v0.3 https://github.com/$repo.git $REPO_NAME
-            fi
-          done
-
-      - name: "🐍 Setup Python ${{ env.PYTHON_VERSION }}"
-        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
-        id: setup-python
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
-
-      - name: "📦 Install Initial Python Dependencies using uv"
-        working-directory: langchain
-        run: |
-          python -m pip install -U uv
-          python -m uv pip install --upgrade --no-cache-dir pip setuptools pyyaml
-
-      - name: "📦 Organize Library Directories"
-        # Places cloned partner packages into libs/partners structure
-        run: python langchain/.github/scripts/prep_api_docs_build.py
-
-      - name: "🧹 Clear Prior Build"
-        run:
-          # Remove artifacts from prior docs build
-          rm -rf langchain-api-docs-html/api_reference_build/html
-
-      - name: "📦 Install Documentation Dependencies using uv"
-        working-directory: langchain
-        run: |
-          # Install all partner packages in editable mode with overrides
-          python -m uv pip install $(ls ./libs/partners | grep -v azure-ai | xargs -I {} echo "./libs/partners/{}") --overrides ./docs/vercel_overrides.txt --prerelease=allow
-
-          # Install langchain-azure-ai with tools extra
-          python -m uv pip install "./libs/partners/azure-ai[tools]" --overrides ./docs/vercel_overrides.txt --prerelease=allow
-
-          # Install core langchain and other main packages
-          python -m uv pip install libs/core libs/langchain libs/text-splitters libs/community libs/experimental libs/standard-tests
-
-          # Install Sphinx and related packages for building docs
-          python -m uv pip install -r docs/api_reference/requirements.txt
-
-      - name: "🔧 Configure Git Settings"
-        working-directory: langchain
-        run: |
-          git config --local user.email "actions@github.com"
-          git config --local user.name "Github Actions"
-
-      - name: "📚 Build API Documentation"
-        working-directory: langchain
-        run: |
-          # Generate the API reference RST files
-          python docs/api_reference/create_api_rst.py
-
-          # Build the HTML documentation using Sphinx
-          # -T: show full traceback on exception
-          # -E: don't use cached environment (force rebuild, ignore cached doctrees)
-          # -b html: build HTML docs (vs PDS, etc.)
-          # -d: path for the cached environment (parsed document trees / doctrees)
-          #     - Separate from output dir for faster incremental builds
-          # -c: path to conf.py
-          # -j auto: parallel build using all available CPU cores
-          python -m sphinx -T -E -b html -d ../langchain-api-docs-html/_build/doctrees -c docs/api_reference docs/api_reference ../langchain-api-docs-html/api_reference_build/html -j auto
-
-          # Post-process the generated HTML
-          python docs/api_reference/scripts/custom_formatter.py ../langchain-api-docs-html/api_reference_build/html
-
-          # Default index page is blank so we copy in the actual home page.
-          cp ../langchain-api-docs-html/api_reference_build/html/{reference,index}.html
-
-          # Removes Sphinx's intermediate build artifacts after the build is complete.
-          rm -rf ../langchain-api-docs-html/_build/
-
-      # Commit and push changes to langchain-api-docs-html repo
-      - uses: EndBug/add-and-commit@290ea2c423ad77ca9c62ae0f5b224379612c0321 # v10.0.0
-        with:
-          cwd: langchain-api-docs-html
-          message: "Update API docs build from v0.3 branch"