diff --git a/.github/workflows/third-party.yml b/.github/workflows/third-party.yml
new file mode 100644
index 0000000..4751e18
--- /dev/null
+++ b/.github/workflows/third-party.yml
@@ -0,0 +1,101 @@
+name: Third-Party Tests
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+      - main
+    types:
+      - labeled
+      - synchronize
+
+env:
+  RUSTFLAGS: "--cfg uuid_unstable"
+
+jobs:
+  langchain-core:
+    name: Test langchain-core
+    runs-on: ubuntu-latest
+    if: >
+      (github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'third-party-tests')) ||
+      github.event_name == 'workflow_dispatch'
+    steps:
+      - name: Checkout uuid-utils
+        uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Build uuid-utils wheel
+        run: |
+          pip install maturin
+          maturin build --release --out dist
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+
+      - name: Checkout langchain-core
+        uses: actions/checkout@v4
+        with:
+          repository: langchain-ai/langchain
+          path: langchain
+          sparse-checkout: |
+            libs/core
+            libs/standard-tests
+            libs/text-splitters
+          sparse-checkout-cone-mode: false
+
+      - name: Install langchain-core dependencies and run tests
+        run: |
+          cd langchain/libs/core
+          uv sync --all-groups
+          WHEEL_FILE=$(ls $GITHUB_WORKSPACE/dist/uuid_utils-*.whl)
+          UV_NO_SYNC=1 uv pip install --force-reinstall $WHEEL_FILE
+          UV_NO_SYNC=1 make test
+
+  langsmith-sdk:
+    name: Test langsmith SDK
+    runs-on: ubuntu-latest
+    if: >
+      (github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'third-party-tests')) ||
+      github.event_name == 'workflow_dispatch'
+    steps:
+      - name: Checkout uuid-utils
+        uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Build uuid-utils wheel
+        run: |
+          uv pip install --system maturin
+          maturin build --release --out dist
+
+      - name: Checkout langsmith-sdk
+        uses: actions/checkout@v4
+        with:
+          repository: langchain-ai/langsmith-sdk
+          path: langsmith-sdk
+          sparse-checkout: python
+          sparse-checkout-cone-mode: false
+
+      - name: Install langsmith-sdk dependencies and run tests
+        run: |
+          cd langsmith-sdk/python
+          uv sync --all-groups
+          WHEEL_FILE=$(ls $GITHUB_WORKSPACE/dist/uuid_utils-*.whl)
+          UV_NO_SYNC=1 uv pip install --force-reinstall $WHEEL_FILE
+          UV_NO_SYNC=1 make test