jongio/skills

Jon Gallant's collection of skills for AI coding agents — works with GitHub Copilot, Claude, Codex, and any agent that supports the SKILL.md format. A general-purpose monorepo: each skill lives in its own folder under skills/ and can be installed individually or all at once.

Skills

Skill	What it does
create-canvas-app	Build GitHub Copilot App canvas extensions fast — a no-build Preact + htm kit with live SSE state, durable storage, Primer theming, official GitHub Lucide icons, deep links into the app, a generator, and an installable skill.
create-gh-pages-site	Scaffold a working GitHub Pages site from a vetted template (static, Astro, React + Vite, Eleventy, or Jekyll) into your current repo by default — injects the correct base path for the target repo, wires the official GitHub Actions Pages deploy workflow, sets the repo's Website link, and shows how to enable Pages.
repo-ready	Scaffold and maintain the standard community health files every GitHub repository needs (.gitignore, LICENSE, CONTRIBUTING, issue templates, CI workflows, dependabot, and more). Two modes: init (interview + scaffold) and update (scan for gaps).
naming-is-hard	Interactive naming assistant for projects, CLIs, and products. Profiles what you're building, generates diverse candidate names, learns your preferences as you react, and validates finalists against real availability (domains, GitHub, npm/PyPI/crates/RubyGems/NuGet, social handles) plus a trademark and existing-business screen. Every finalist lands a verdict: Deal Breaker, It's Complicated, or Perfect Match.
eli5	Explain the code, error, design, or idea already in context using plain language, a useful analogy, the proper grown-up terms, and an honest note about where the analogy stops working.
dns-doctor	Audit DNS delegation, records, DNSSEC, CAA, web routing, TLS, CDN behavior, mail authentication, takeover exposure, and zone hygiene, then apply exact provider changes only after explicit user approval.
deps-doctor	Audit, update, and secure dependencies across npm, pnpm, Yarn, pip, Poetry, uv, Go, Cargo, Bundler, Composer, NuGet, Maven, Gradle, Swift, pub, and Hex, plus Docker base images, GitHub Actions, Terraform, and dev container features. Ranks vulnerabilities by exploitation evidence, withholds releases too new to have been vetted, fixes breaking changes forward instead of rolling back, and never opens an empty dependency pull request.
git-tidy	Comprehensive git repo hygiene in one pass: branches, worktrees, stashes, tags, remotes, merge artifacts, ignored-but-tracked files, large history blobs, and maintenance health. Classifies every finding by confidence (safe, review, keep) and deletes nothing without explicit approval.

A skill is invoked straight from the Copilot composer — here create-canvas-app turns a one-line prompt into a working canvas:

Install

Uses the vercel-labs/skills CLI (skills.sh) — note the binary is skills (plural).

# List the skills available in this repo:
npx skills add jongio/skills --list

# Install one skill globally for GitHub Copilot:
npx skills add jongio/skills --skill create-canvas-app -g --agent github-copilot

# Install into the current project instead of globally (drop -g):
npx skills add jongio/skills --skill create-canvas-app

# Install every skill in the repo:
npx skills add jongio/skills --all

# Pin to a branch or tag:
npx skills add jongio/skills#main --skill create-canvas-app

After any install, reload skills with /skills reload or start a new session. Each skill is then available as /<skill-name> (e.g. /create-canvas-app).

Add as a marketplace, or install as a plugin

jongio/skills also plugs into the GitHub Copilot plugin system (works in both the Copilot app and the Copilot CLI). There are two ways to use it.

Add it as a marketplace — browse and install individual skills. The repo ships a root marketplace.json that indexes its skills:

# Register the marketplace:
copilot plugin marketplace add jongio/skills

# See what's available:
copilot plugin marketplace browse jongio-skills

# Install one skill from it (form: <plugin>@<marketplace>):
copilot plugin install create-canvas-app@jongio-skills

In the Copilot app — no commands needed:

1. Open Settings and select Plugins.

   

2. Click Install ▾ → Add marketplace, enter jongio/skills, and click Add marketplace.

   

3. The marketplace's skills appear grouped under jongio-skills — click Install on the one you want.

   

4. The skill installs and is enabled, ready to use right away.

   

Or install the whole repo as a single plugin — gets every skill under skills/ at once (uses the root plugin.json):

copilot plugin install jongio/skills

App and editor support

The repository keeps every skill under skills/ and wraps that canonical directory with the native manifests required by each supported host. No skill content is copied between formats.

Surface	Support	Install or discovery path
GitHub Copilot app	Marketplace and individual or complete plugin install	Open Customize, select Plugins, add jongio/skills, then install one skill or jongio-skills.
GitHub Copilot in Visual Studio Code	Agent Plugins 1.0 and marketplace install	Enable chat.plugins.enabled, run Chat: Install Plugin From Source, and enter https://github.com/jongio/skills.
GitHub Copilot CLI	Marketplace and direct plugin install	Run copilot plugin marketplace add jongio/skills or copilot plugin install jongio/skills.
Copilot coding agent and code review	Agent Skills in the target repository	Install selected skills into the target repository with npx skills add jongio/skills.
ChatGPT desktop and Codex CLI	Codex marketplace and skills-only plugin	Add jongio/skills as a marketplace. If using sparse paths, include .agents/plugins, .codex-plugin, and skills.
ChatGPT web and mobile	Public directory plugins only	A Git marketplace cannot enable these surfaces. Public availability requires review through the OpenAI plugin submission portal.
Codex IDE extension	Standalone Agent Skills only	The IDE extension does not support plugins. Install selected skills with npx skills add jongio/skills --agent codex.
Claude Code, including its Visual Studio Code and JetBrains integrations	Claude marketplace plugin	Run /plugin marketplace add jongio/skills, then /plugin install jongio-skills@jongio-skills.
Cursor	Agent Plugins 1.0 and Cursor marketplace	Install https://github.com/jongio/skills from Customize, or import the repository as a marketplace.
Gemini CLI and its editor companion	Gemini extension	Run gemini extensions install https://github.com/jongio/skills. Gemini Code Assist is a separate product and does not load Gemini CLI extensions.
Goose Desktop, Windsurf, Cline, Roo Code, and OpenCode	Native Agent Skills	Install selected skills with npx skills add jongio/skills; the installer places them in each host's supported skills directory.

The root plugin.json follows Agent Plugins 1.0, which is shared by GitHub Copilot in Visual Studio Code, Cursor, Codex, and other compatible hosts. Vendor-specific manifests exist only where a host requires a different discovery path:

plugin.json                         Agent Plugins 1.0 package
marketplace.json                    GitHub Copilot marketplace
.agents/plugins/marketplace.json    Codex and ChatGPT desktop marketplace
.codex-plugin/plugin.json           Codex plugin compatibility manifest
.claude-plugin/marketplace.json     Claude Code marketplace
.claude-plugin/plugin.json          Claude Code plugin
.cursor-plugin/marketplace.json     Cursor marketplace
gemini-extension.json               Gemini CLI extension
skills/                             Canonical Agent Skills

Layout

marketplace.json              GitHub Copilot marketplace
plugin.json                   Agent Plugins 1.0 package manifest
.agents/plugins/              Codex and ChatGPT desktop marketplace
.codex-plugin/                Codex compatibility manifest
.claude-plugin/               Claude Code plugin and marketplace
.cursor-plugin/               Cursor marketplace
gemini-extension.json         Gemini CLI extension
test/                         Cross-harness distribution parity tests
skills/
  create-canvas-app/          One self-contained skill
    SKILL.md                  Authoring contract the agent reads
    README.md                 Human docs for the skill
    references/               Lookup detail SKILL.md links to, to stay under 500 lines
    evals/                    Vally eval spec plus its fixtures
    test/                     Deterministic tests, run in CI for every skill
    kit/  scripts/  docs/     Skill-specific assets
docs/                         Specs, test plans, thumbnail prompts
site/                         Astro catalog published to GitHub Pages
.github/workflows/            skill-lint (every push), skill-eval (agent evals)

Adding a skill

A skill is more than its folder: CI enforces that every skill is registered everywhere the catalog advertises it. The root distribution test covers every skill and host manifest. Skills with additional registration contracts enforce them in local tests. On pull requests, skill-lint.yml runs Vally lint, strict eval-spec lint, and deterministic tests for affected skills. Pushes to the default branch cover every skill. The workflow always builds the catalog site.

1. skills/<name>/ with SKILL.md (500-line ceiling; overflow goes to references/), README.md, package.json, test/, and evals/<name>/eval.yaml.
2. The skill table in this README.
3. marketplace.json and the keywords array in plugin.json.
4. site/src/content/skills/<name>.md, with thumb: pointing at images/thumb-<name>.png.
5. The all= matrix in .github/workflows/skill-eval.yml.
6. A thumbnail saved byte-identically to both skills/<name>/thumbnail.png and site/public/images/thumb-<name>.png, generated from a prompt recorded in docs/thumbnail-prompts.md, and listed in site/public/images/IMAGES.md.

Copy the newest skill rather than the oldest; it reflects the current conventions.

License

MIT — see LICENSE.