Chrome Extension Init Skill

Overview

Guide the user to pick a scaffolding toolchain (Plasmo / WXT / Vite + CRXJS), scaffold via the official CLI (not manual setup), then do minimal verification, git init, and the first commit.

Workflow

1) Confirm Preconditions

• Verify the target directory is empty or get permission to scaffold into it.
• Confirm target browsers (default to Chrome/Chromium). If the user needs Firefox, note differences and ask before proceeding.

2) Choose Scaffolding Toolchain (multi-turn)

Ask these in order; use numeric options for each choice. Do not manually scaffold; rely on the selected toolchain CLI.

• Scaffolding toolchain:
  • 1. Plasmo
  • 2. WXT
  • 3. Vite + CRXJS
• Target directory (absolute/relative path) and project name.
• Package manager:
  • 1. pnpm
  • 2. npm
  • 3. yarn
• Basic extension metadata: name, description, author (or confirm to keep CLI defaults).

Then ask toolchain-specific questions before running any interactive CLI:

• If Plasmo:

  • Starter template:
    • 1. Default starter (React)
    • 2. Example template from PlasmoHQ/examples (uses --with-<example>): with-vue, with-svelte, with-env, with-tailwindcss, with-antd
    • 3. Other example (user provides the exact example name, e.g. with-ai)
  • Initial entry files to include (multi-select; maps to --entry comma list; omit extensions):
    • 1. popup
    • 2. options
    • 3. newtab
    • 4. background
    • 5. content
    • 6. contents/inline
    • 7. contents/overlay
  • If using npm, remind the user that npm requires -- before passing plasmo flags (npm does not forward args).

• If WXT:

  • Starter template (maps to --template):
    • 1. vanilla
    • 2. vue
    • 3. react
    • 4. svelte
    • 5. solid
  • Package manager (maps to --pm):
    • 1. pnpm
    • 2. npm
    • 3. yarn
  • Optional: enable debug mode (maps to --debug)
  • Optional: manifest target for future wxt commands: MV3 (default, --mv3) or MV2 (--mv2)

• If Vite + CRXJS:

  • Framework template (maps to --template):
    • 1. Vanilla: vanilla (JS) / vanilla-ts (TS)
    • 2. React: react (JS) / react-ts (TS)
    • 3. Vue: vue (JS) / vue-ts (TS)
    • 4. Svelte: svelte (JS) / svelte-ts (TS)
    • 5. Solid: solid (JS) / solid-ts (TS)
  • Language:
    • 1. TypeScript (recommended)
    • 2. JavaScript

• Confirm whether to proceed with an interactive CLI run now:

  • 1. Yes, run the CLI and answer prompts
  • 2. No, ask more questions first

Use toast for user-facing prompts and avoid alert when generating UI scaffolding.

3) Scaffold via Official CLI (interactive)

• Treat these CLIs as interactive. Before running them, summarize the expected answers with the user and confirm.
• Run the CLI in a TTY. If an unexpected prompt appears, stop and ask the user before answering.

Toolchain commands (examples):

• Plasmo:
  • Default: pnpm create plasmo "<name>" --entry=options,newtab,contents/inline
  • Example: pnpm create plasmo "<name>" --entry=options,newtab,contents/inline --with-vue
  • NPM (note --): npm create plasmo "<name>" -- --entry=options,newtab,contents/inline --with-vue
• WXT:
  • npx wxt@latest init "<dir>" --template react --pm pnpm
• Vite + CRXJS:
  • Always include @latest (avoid cached old versions)
  • npm create crxjs@latest "<dir>" -- --template react-ts

4) Verify & Minimal Wiring

• Install dependencies with the chosen package manager.
• Run the toolchain's build (and dev if available) to ensure it produces a working extension output.
• Confirm MV3 by default; if the user explicitly requests MV2, ask again and only proceed if the chosen toolchain supports it.
• Keep Chrome content scripts as classic scripts; avoid ES module imports unless the manifest explicitly loads them as modules.

5) Initialize Git and Commit

• Initialize git in the project root if not already initialized by the CLI.
• Ensure .gitignore exists and matches the chosen tooling.
• Create AGENTS.md in the project root with the rule: - Run build after every change.
• Commit all files with a clear message like "chore: initialize extension project".

6) Hand-off

• Provide quick start commands (read from the generated package.json scripts instead of guessing).
• Explain where to edit manifest, background/service worker, content scripts, and UI pages as generated by the chosen toolchain.