issue-dedupe.yml

# Detects duplicate issues using Claude Code with the /dedupe command.
# Triggered automatically when a new issue is opened, or manually for a single issue.
name: Issue Duplicate Detection

on:
  issues:
    types: [opened]
  workflow_dispatch:
    inputs:
      issue_number:
        description: 'Issue number to check for duplicates'
        required: true
        type: string

permissions:
  contents: read
  issues: write

concurrency:
  group: dedupe-${{ github.event.issue.number || inputs.issue_number }}
  cancel-in-progress: true

jobs:
  detect-duplicate:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    # Skip pull-requests that surface as issues and bot-opened issues
    if: >
      (github.event_name == 'workflow_dispatch') ||
      (github.event.issue.pull_request == null &&
       !endsWith(github.actor, '[bot]') &&
       github.actor != 'github-actions')
    steps:
      - uses: actions/checkout@v4

      - name: Determine issue number
        id: issue
        env:
          EVENT_NAME: ${{ github.event_name }}
          INPUT_NUMBER: ${{ inputs.issue_number }}
          ISSUE_NUMBER: ${{ github.event.issue.number }}
        run: |
          if [ "$EVENT_NAME" = "workflow_dispatch" ]; then
            echo "number=$INPUT_NUMBER" >> "$GITHUB_OUTPUT"
          else
            echo "number=$ISSUE_NUMBER" >> "$GITHUB_OUTPUT"
          fi

      - uses: anthropics/claude-code-action@v1
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          prompt: "/dedupe ${{ github.repository }}/issues/${{ steps.issue.outputs.number }}"
          anthropic_api_key: ${{ secrets.AUTHROPIC_API_KEY }}
          github_token: ${{ secrets.GITHUB_TOKEN }}
          allowed_bots: "github-actions"
          allowed_non_write_users: "*"