generate-a2a-json.yml

name: Auto-generate A2A JSON Schema

on:
  pull_request:
    branches:
      - main
    paths:
      - "types/**"
    types:
      - opened
      - synchronize
      - reopened

jobs:
  generate_json:
    name: Generate JSON Schema
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout Code
        uses: actions/checkout@v5
        with:
          fetch-depth: 0
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}

      - name: Setup Node.js
        uses: actions/setup-node@v5
        with:
          node-version: "20"

      - name: Install dependencies and generate a2a.json
        working-directory: types
        run: |
          npm install
          npm run generate
        id: generate_schema

      - name: Configure Git for Bot
        if: github.event.pull_request.head.repo.full_name == github.repository
        run: |
          git config user.name "a2a-bot"
          git config user.email "a2a-bot@google.com"

      - name: Check for Changes
        id: git_status
        run: |
          git add specification/json/a2a.json
          if ! git diff --cached --quiet --exit-code; then
            echo "changes_detected=true" >> "$GITHUB_OUTPUT"
            echo "a2a.json is not up-to-date with types.ts"
          else
            echo "a2a.json is up-to-date."
          fi

      - name: Commit and Push Changes (if on base repository)
        if: steps.git_status.outputs.changes_detected == 'true' && github.event.pull_request.head.repo.full_name == github.repository
        run: |
          git commit -m "chore: Auto-generate a2a.json from types.ts changes"
          git push

      - name: Fail on Fork PR if Changes Required
        if: steps.git_status.outputs.changes_detected == 'true' && github.event.pull_request.head.repo.full_name != github.repository
        run: |
          echo "::error::a2a.json is out of date."
          echo "Please run 'npm install' then 'npm run generate' in the 'types' directory of your branch and commit the updated 'specification/json/a2a.json' file."
          exit 1 # Exit with a non-zero code to fail the workflow