A team adds a coordination workflow after several Copilot coding agent pull requests changed the same deployment files. The team wants to detect conflicts, publish evidence, and block merge when degraded coordination is detected. Evaluate the following statements. 1. The concurrency group prevents duplicate coordination runs for the same pull request. 2. The concurrency group coordinates conflicts across different pull requests. 3. The artifact step can preserve evidence after a failed overlap check.

name: agent-coordination-check

on:
  pull_request:
    branches:
      - main

permissions:
  contents: read
  pull-requests: read

concurrency:
  group: coordination-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  coordinate:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
           fetch-depth: 0

         - name: Detect shared-file conflict
           id: overlap
           run: |
             mkdir -p coordination
             git diff --name-only origin/main...HEAD > coordination/files.txt
             python .github/scripts/check_shared_agent_files.py \
               --files coordination/files.txt \
               --owners .github/agent-ownership.yml \
               | tee coordination/overlap.log

         - name: Upload coordination evidence
           if: always()
           uses: actions/upload-artifact@v4
           with:
             name: coordination-evidence
             path: coordination/