Add Claude Code GitHub Workflow (#2384)

This PR adds a GitHub Actions workflow that enables Claude Code
integration in our repository.

- The workflow runs automatically whenever Claude is mentioned in PR or
issue comments
- Claude gets access to the entire PR or issue context including files,
diffs, and previous comments
- Claude's default tools are limited to reading/writing files and
interacting with our repo by creating comments, branches, and commits.

Author: rjpower

.github/workflows/claude.yml

@@ -0,0 +1,67 @@
+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:
+    # Only run if comment/issue is from a repo writer (OWNER, MEMBER, or COLLABORATOR) and contains @claude
+    if: |
+      (github.event_name == 'issue_comment' &&
+       (github.event.comment.author_association == 'OWNER' ||
+        github.event.comment.author_association == 'MEMBER' ||
+        github.event.comment.author_association == 'COLLABORATOR') &&
+       contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review_comment' &&
+       (github.event.comment.author_association == 'OWNER' ||
+        github.event.comment.author_association == 'MEMBER' ||
+        github.event.comment.author_association == 'COLLABORATOR') &&
+       contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review' &&
+       (github.event.review.author_association == 'OWNER' ||
+        github.event.review.author_association == 'MEMBER' ||
+        github.event.review.author_association == 'COLLABORATOR') &&
+       contains(github.event.review.body, '@claude')) ||
+      (github.event_name == 'issues' &&
+       (github.event.issue.author_association == 'OWNER' ||
+        github.event.issue.author_association == 'MEMBER' ||
+        github.event.issue.author_association == 'COLLABORATOR') &&
+       (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: write
+      id-token: write
+      actions: read
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 10
+
+      - name: Run Claude Code
+        id: claude
+        uses: anthropics/claude-code-action@v1
+        with:
+          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+
+          # 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:*)'
+