macOS ARM64 (Apple Silicon) Skill

Purpose

Initialize a project for multi-platform releases via GitHub Actions with automatic Homebrew tap updates. Creates release workflow, sets up secrets, and updates READMEs.

Arguments

$ARGUMENTS - Optional flags:

--dry-run: Show what would be created without making changes
--skip-readme: Don't update project README with install instructions

Prerequisites

Project must be a git repo with GitHub remote
Project must use Bun (bun.lock or bun.lockb present)
Project must have package.json
User must have gh CLI authenticated
Homebrew tap repo must exist at MichaelVessia/homebrew-tap

Process

1. Gather Project Info

git rev-parse --show-toplevel
git remote get-url origin

Extract:

PROJECT_NAME: from package.json name field (strip scope like @foo/)
GITHUB_REPO: owner/repo from git remote
DESCRIPTION: from package.json description or prompt user
ENTRYPOINT: detect main entry (check for src/main.ts, src/index.ts, packages/*/src/main.ts, etc.)

2. Ensure Version Field

Check package.json for version field. If missing, add "version": "0.1.0".

3. Create Release Workflow

Create .github/workflows/release.yml:

name: Release

on:
  push:
    tags:
      - 'v*'

permissions:
  contents: write

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: oven-sh/setup-bun@v2
        with:
          bun-version: latest

      - run: bun install

      - name: Typecheck
        run: bun run typecheck

      - name: Lint
        run: bun run lint

      - name: Test
        run: bun test

      - name: Build all targets
        run: |
          mkdir -p dist
          bun build ${ENTRYPOINT} --compile --target=bun-linux-x64 --outfile dist/${PROJECT_NAME}-linux-x64
          bun build ${ENTRYPOINT} --compile --target=bun-darwin-x64 --outfile dist/${PROJECT_NAME}-darwin-x64
          bun build ${ENTRYPOINT} --compile --target=bun-darwin-arm64 --outfile dist/${PROJECT_NAME}-darwin-arm64

      - name: Create checksums
        run: |
          cd dist
          sha256sum * > checksums.txt

      - name: Release
        uses: softprops/action-gh-release@v2
        with:
          files: dist/*
          generate_release_notes: true

      - name: Update Homebrew tap
        env:
          HOMEBREW_TAP_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
        run: |
          VERSION=${GITHUB_REF#refs/tags/v}
          # ... (generate formula and push to tap)

4. Set Up Secret

Check if HOMEBREW_TAP_TOKEN exists:

gh secret list --repo ${GITHUB_REPO}

If not present, prompt user to add it:

Secret HOMEBREW_TAP_TOKEN not found.
Run: gh secret set HOMEBREW_TAP_TOKEN --repo ${GITHUB_REPO}
(Paste your GitHub PAT with 'repo' scope)

Wait for user confirmation before proceeding.

5. Update Homebrew Tap README

Fetch current README from MichaelVessia/homebrew-tap, add new formula entry to the table if not present:

| [${PROJECT_NAME}](https://github.com/${GITHUB_REPO}) | ${DESCRIPTION} |

Use GitHub API to update:

gh api repos/MichaelVessia/homebrew-tap/contents/README.md --method PUT ...

6. Update Project README

Unless --skip-readme, add/update Installation section with:

## Installation

### Homebrew (macOS)

\`\`\`bash
brew tap MichaelVessia/tap
brew install ${PROJECT_NAME}
\`\`\`

### Download Binary

\`\`\`bash
# macOS ARM64 (Apple Silicon)
curl -L https://github.com/${GITHUB_REPO}/releases/latest/download/${PROJECT_NAME}-darwin-arm64 -o ${PROJECT_NAME}
chmod +x ${PROJECT_NAME} && mv ${PROJECT_NAME} /usr/local/bin/

# macOS x64 (Intel)
curl -L https://github.com/${GITHUB_REPO}/releases/latest/download/${PROJECT_NAME}-darwin-x64 -o ${PROJECT_NAME}
chmod +x ${PROJECT_NAME} && mv ${PROJECT_NAME} /usr/local/bin/

# Linux x64
curl -L https://github.com/${GITHUB_REPO}/releases/latest/download/${PROJECT_NAME}-linux-x64 -o ${PROJECT_NAME}
chmod +x ${PROJECT_NAME} && sudo mv ${PROJECT_NAME} /usr/local/bin/
\`\`\`

7. Commit and Push

git add package.json .github/workflows/release.yml README.md
git commit -m "feat: add multi-platform packaging with GitHub releases and Homebrew"
git push

8. Output Summary

Homebrew release setup complete!

Created:
  - .github/workflows/release.yml
  - Updated package.json with version field
  - Updated README.md with install instructions
  - Added ${PROJECT_NAME} to homebrew-tap README

Next steps:
  1. Run '/release' to create first release
  2. Install via: brew tap MichaelVessia/tap && brew install ${PROJECT_NAME}

Formula Template

The Homebrew formula generated in the workflow:

class ${CLASS_NAME} < Formula
  desc "${DESCRIPTION}"
  homepage "https://github.com/${GITHUB_REPO}"
  version "${VERSION}"
  license "MIT"

  on_macos do
    on_arm do
      url "https://github.com/${GITHUB_REPO}/releases/download/v${VERSION}/${PROJECT_NAME}-darwin-arm64"
      sha256 "${SHA_DARWIN_ARM64}"
    end
    on_intel do
      url "https://github.com/${GITHUB_REPO}/releases/download/v${VERSION}/${PROJECT_NAME}-darwin-x64"
      sha256 "${SHA_DARWIN_X64}"
    end
  end

  on_linux do
    on_intel do
      url "https://github.com/${GITHUB_REPO}/releases/download/v${VERSION}/${PROJECT_NAME}-linux-x64"
      sha256 "${SHA_LINUX_X64}"
    end
  end

  def install
    if OS.mac?
      bin.install "${PROJECT_NAME}-darwin-#{Hardware::CPU.arm? ? "arm64" : "x64"}" => "${PROJECT_NAME}"
    else
      bin.install "${PROJECT_NAME}-linux-x64" => "${PROJECT_NAME}"
    end
  end

  test do
    assert_match "${PROJECT_NAME}", shell_output("#{bin}/${PROJECT_NAME} --help")
  end
end

Caveats Detection

If project has specific env vars (detected from .env.example, README.md, or config files), add a caveats block to the formula prompting users to configure them.

Not Supported

Non-Bun projects (Cargo, Python, etc.)
Monorepos with multiple publishable packages
Private repositories
Custom tap repositories (hardcoded to MichaelVessia/homebrew-tap)

Agent Skills: macOS ARM64 (Apple Silicon)

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