diff --git a/.github/workflows/claude-code-review.yml b/.github/workflows/claude-code-review.yml
new file mode 100644
index 000000000..8164f7d28
--- /dev/null
+++ b/.github/workflows/claude-code-review.yml
@@ -0,0 +1,56 @@
+name: Claude Code Review
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+    # Optional: Only run on specific file changes
+    # paths:
+    #   - "src/**/*.ts"
+    #   - "src/**/*.tsx"
+    #   - "src/**/*.js"
+    #   - "src/**/*.jsx"
+
+jobs:
+  claude-review:
+    # Optional: Filter by PR author
+    # if: |
+    #   github.event.pull_request.user.login == 'external-contributor' ||
+    #   github.event.pull_request.user.login == 'new-developer' ||
+    #   github.event.pull_request.author_association == 'FIRST_TIME_CONTRIBUTOR'
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
+      issues: read
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Run Claude Code Review
+        id: claude-review
+        uses: anthropics/claude-code-action@v1
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          prompt: |
+            REPO: ${{ github.repository }}
+            PR NUMBER: ${{ github.event.pull_request.number }}
+
+            Please review this pull request and provide feedback on:
+            - Code quality and best practices
+            - Potential bugs or issues
+            - Performance considerations
+            - Security concerns
+            - Test coverage
+
+            Use the repository's CLAUDE.md for guidance on style and conventions. Be constructive and helpful in your feedback.
+
+            Use `gh pr comment` with your Bash tool to leave your review as a comment on the PR.
+
+          # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
+          # or https://code.claude.com/docs/en/cli-reference for available options
+          claude_args: '--allowed-tools "Bash(gh issue view:*),Bash(gh search:*),Bash(gh issue list:*),Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*),Bash(gh pr list:*)"'
diff --git a/.github/workflows/claude-fix.yml b/.github/workflows/claude-fix.yml
new file mode 100644
index 000000000..e6f1a1b16
--- /dev/null
+++ b/.github/workflows/claude-fix.yml
@@ -0,0 +1,93 @@
+name: Claude Fix Issue
+
+on:
+  issues:
+    types: [labeled]
+
+jobs:
+  claude-fix:
+    if: github.event.label.name == 'claude-fix'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: write
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: "pnpm"
+
+      - name: Run Claude to Fix Issue
+        id: claude-fix
+        uses: anthropics/claude-code-action@v1
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          prompt: |
+            ISSUE #${{ github.event.issue.number }}: ${{ github.event.issue.title }}
+
+            ${{ github.event.issue.body }}
+
+            ---
+
+            You are tasked with fixing this issue using strict Test-Driven Development (TDD).
+
+            IMPORTANT RULES:
+            1. You may create PRs but NEVER merge them
+            2. Only create a PR if you have a working fix with passing tests
+
+            FOLLOW THIS PROCESS:
+
+            ## Step 1: Understand the Issue
+            - Read and analyze the issue carefully
+            - Search the codebase to understand the relevant code
+            - Comment on the issue acknowledging you're working on it
+
+            ## Step 2: Reproduce the Problem (TDD Red Phase)
+            - Write or identify a failing test that demonstrates the bug/missing feature
+            - Run the test and SHOW THE FAILING OUTPUT
+            - If you cannot reproduce the issue with a test, comment on the issue explaining why and stop
+
+            ## Step 3: Implement the Fix (TDD Green Phase)
+            - Write the MINIMAL code needed to make the test pass
+            - Run the test again and SHOW THE PASSING OUTPUT
+            - Run the appropriate test suite to ensure all tests pass
+
+            ## Step 4: Refactor if Needed
+            - Clean up the code if necessary
+            - Ensure tests still pass
+
+            ## Step 5: Create PR (only if fix is successful)
+            - Create a new branch: `fix/issue-${{ github.event.issue.number }}`
+            - Commit your changes with a clear message referencing the issue
+            - Push the branch and create a PR
+            - The PR description should include:
+              - What the issue was
+              - The failing test output (before)
+              - The passing test output (after)
+              - Brief explanation of the fix
+            - Link the PR to the issue with "Fixes #${{ github.event.issue.number }}"
+
+            ## If You Cannot Fix the Issue
+            - Comment on the issue explaining what you tried and why it didn't work
+            - Do NOT create a PR with a non-working fix
+
+          claude_args: '--allowedTools "Bash(grep:*),Bash(rg:*),Bash(find:*),Bash(ls:*),Bash(cat:*),Bash(head:*),Bash(tail:*),Bash(python:*),Bash(python3:*),Bash(pip:*),Bash(nox:*),Bash(pytest:*),Bash(make:*),Bash(pnpm:*),Bash(node:*),Bash(npm:*),Bash(npx:*),Bash(git status:*),Bash(git diff:*),Bash(git branch:*),Bash(git checkout:*),Bash(git add:*),Bash(git commit:*),Bash(git push:*),Bash(git log:*),Bash(gh issue view:*),Bash(gh issue comment:*),Bash(gh pr create:*),Bash(gh pr view:*),Bash(gh pr list:*),Edit,Read,Write,Glob,Grep"'
diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
new file mode 100644
index 000000000..d1998486a
--- /dev/null
+++ b/.github/workflows/claude.yml
@@ -0,0 +1,49 @@
+name: Claude Code
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned]
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  claude:
+    if: |
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude')) ||
+      (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
+      issues: read
+      id-token: write
+      actions: read # Required for Claude to read CI results on PRs
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Run Claude Code
+        id: claude
+        uses: anthropics/claude-code-action@v1
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+
+          # This is an optional setting that allows Claude to read CI results on PRs
+          additional_permissions: |
+            actions: read
+
+          # Optional: Give a custom prompt to Claude. If this is not specified, Claude will perform the instructions specified in the comment that tagged it.
+          # prompt: 'Update the pull request description to include a summary of changes.'
+
+          # Optional: Add claude_args to customize behavior and configuration
+          # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
+          # or https://code.claude.com/docs/en/cli-reference for available options
+          # claude_args: '--allowed-tools Bash(gh pr:*)'
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 000000000..55747ec40
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,87 @@
+# Braintrust SDK
+
+Multi-language SDK for Braintrust - an AI/ML evaluation and observability platform.
+
+## Repository Structure
+
+```
+sdk/
+├── py/                    # Python SDK (main package: braintrust)
+├── js/                    # JavaScript/TypeScript SDK
+├── core/                  # Shared core code
+│   ├── py/               # Python core
+│   └── js/               # JavaScript core
+└── integrations/          # Framework integrations
+    ├── langchain-py/     # LangChain Python
+    ├── adk-py/           # ADK Python
+    └── otel-js/          # OpenTelemetry JS (see integrations/otel-js/CLAUDE.md)
+```
+
+## Development Commands
+
+### Python SDK (py/)
+
+```bash
+# Install dev dependencies
+cd py && make install-dev
+
+# Run all tests (via nox)
+make nox                    # from root
+cd py && nox                # from py/
+
+# Run specific test session
+cd py && nox -s test_core
+cd py && nox -s test_openai
+cd py && nox -s test_anthropic
+
+# Lint
+cd py && make lint
+
+# Full verification
+cd py && make verify
+```
+
+### JavaScript SDK (js/)
+
+```bash
+# Install dependencies (from root)
+pnpm install
+
+# Build
+pnpm run build
+
+# Run tests
+pnpm run test
+cd js && make test
+
+# Lint
+pnpm run lint
+```
+
+### Linting & Formatting (Both)
+
+```bash
+# Run pre-commit hooks (format + lint)
+make fixup
+```
+
+## Testing Guidelines
+
+- Python uses `pytest` via `nox` for test isolation across dependency versions
+- JavaScript uses `vitest`
+- Always run relevant tests before submitting changes
+- For Python integration tests, check which nox sessions are relevant (e.g., `test_openai`, `test_anthropic`, `test_temporal`)
+
+## Key Files
+
+- `py/noxfile.py` - Python test session definitions
+- `py/pyproject.toml` - Python package configuration
+- `js/package.json` - JavaScript package configuration
+- `pnpm-workspace.yaml` - Workspace configuration
+
+## Code Style
+
+- Follow existing patterns in the codebase
+- Python: Use type hints, follow PEP 8
+- JavaScript/TypeScript: Follow existing ESLint configuration
+- Avoid unnecessary comments - code should be self-documenting