ai-assisted-label.yaml

name: Add ai-assisted label

on:
  pull_request_target:
    types: [opened, synchronize]

jobs:
  detect-ai:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - name: Ensure ai-assisted label exists
        env:
          GH_TOKEN: ${{ github.token }}
          REPO: ${{ github.repository }}
        run: |
          gh label create "ai-assisted" --repo "$REPO" --color "8B5CF6" --description "AI-assisted contribution" 2>/dev/null || true

      - name: Check for AI assistance markers
        env:
          GH_TOKEN: ${{ github.token }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REPO: ${{ github.repository }}
        run: |
          found=false

          # Check PR description for Claude Code marker
          pr_body=$(gh pr view "$PR_NUMBER" --repo "$REPO" --json body --jq '.body // ""')
          if echo "$pr_body" | grep -qi "Generated with.*Claude Code"; then
            echo "Found: Claude Code marker in PR description"
            found=true
          fi

          # Check commit messages for AI co-authors
          if [ "$found" = false ]; then
            commits=$(gh pr view "$PR_NUMBER" --repo "$REPO" --json commits --jq '.commits[].messageBody')

            if echo "$commits" | grep -qi "noreply@anthropic\.com"; then
              echo "Found: Anthropic co-author in commit trailers"
              found=true
            fi

            if echo "$commits" | grep -qi "copilot.*@users\.noreply\.github\.com\|copilot-swe-agent"; then
              echo "Found: GitHub Copilot co-author in commit trailers"
              found=true
            fi
          fi

          # Check if PR author is a known AI bot
          pr_author=$(gh pr view "$PR_NUMBER" --repo "$REPO" --json author --jq '.author.login')
          pr_author_lower=$(echo "$pr_author" | tr '[:upper:]' '[:lower:]')
          if [[ "$pr_author_lower" == *"copilot"* ]] || [[ "$pr_author_lower" == *"claude"* ]]; then
            echo "Found: PR authored by AI bot ($pr_author)"
            found=true
          fi

          # Add label if any marker found (idempotent)
          if [ "$found" = true ]; then
            echo "Adding 'ai-assisted' label to PR #$PR_NUMBER"
            gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "ai-assisted"
          else
            echo "No AI assistance markers detected in PR #$PR_NUMBER"
          fi