j0hanz-marketplace

Plugins for Claude Code, GitHub Copilot CLI and Antigravity CLI: skills, agents, and MCP servers you can install into any project. Claude Code and Copilot CLI share one catalog; Antigravity CLI installs each plugin from its folder here.

Install in Claude Code

1. Add the marketplace (once, from inside Claude Code):

/plugin marketplace add j0hanz/j0hanz-marketplace

2. Install a plugin. One command per plugin, so pick only what you need:

/plugin install tutor@j0hanz-marketplace
/plugin install css@j0hanz-marketplace
/plugin install frontend@j0hanz-marketplace
/plugin install mcp-hub@j0hanz-marketplace
/plugin install filesystem-mcp@j0hanz-marketplace
/plugin install review@j0hanz-marketplace
/plugin install prompt@j0hanz-marketplace
/plugin install workbench@j0hanz-marketplace
/plugin install output-styles@j0hanz-marketplace
/plugin install nodejs@j0hanz-marketplace
/plugin install typescript-pro@j0hanz-marketplace
/plugin install writeup@j0hanz-marketplace
/plugin install groundwork@j0hanz-marketplace
/plugin install telltale@j0hanz-marketplace

3. Use it. Check MCP server connections with /mcp, or type an invocable skill as a slash command, namespaced by plugin:

/tutor:teach
/css:css-audit
/review:code-quality-review

Or browse everything installed with /plugin. To remove one:

/plugin uninstall tutor@j0hanz-marketplace

Install in GitHub Copilot CLI

Copilot CLI reads the same catalog (.claude-plugin/marketplace.json). From a shell, add the marketplace once, then install what you need:

copilot plugin marketplace add j0hanz/j0hanz-marketplace
copilot plugin install tutor@j0hanz-marketplace
copilot plugin install css@j0hanz-marketplace
copilot plugin install frontend@j0hanz-marketplace
copilot plugin install mcp-hub@j0hanz-marketplace
copilot plugin install filesystem-mcp@j0hanz-marketplace
copilot plugin install review@j0hanz-marketplace
copilot plugin install prompt@j0hanz-marketplace
copilot plugin install workbench@j0hanz-marketplace
copilot plugin install nodejs@j0hanz-marketplace
copilot plugin install typescript-pro@j0hanz-marketplace
copilot plugin install writeup@j0hanz-marketplace
copilot plugin install groundwork@j0hanz-marketplace

Check with copilot plugin list, or /skills and /agent inside a session. Copilot lists plugin skills by bare name (css-audit, not css:css-audit). Remove one with copilot plugin uninstall <name>.

Copilot cloud agent. It installs no plugins by default. A repository opts in through .github/copilot/settings.json, which Copilot CLI also reads (same entry shape as Claude Code's extraKnownMarketplaces):

{
  "extraKnownMarketplaces": {
    "j0hanz-marketplace": { "source": { "source": "github", "repo": "j0hanz/j0hanz-marketplace" } }
  },
  "enabledPlugins": { "css@j0hanz-marketplace": true }
}

What differs under Copilot

• output-styles is Claude Code only: Copilot has no output styles.
• Hooks detect the client and answer in its shape. Stop-time notes that Claude shows as a system message surface as a hook warning in Copilot.
• The Claude UserPromptExpansion event does not exist in Copilot, so typed-slash-command briefs fire through PreToolUse on the skill tool instead.

Install in Antigravity CLI

Antigravity CLI reads no third-party catalog, so there is no marketplace to add: each plugin installs straight from its folder in this repo. From a shell:

agy plugin install https://github.com/j0hanz/j0hanz-marketplace/tree/main/plugins/frontend
agy plugin install https://github.com/j0hanz/j0hanz-marketplace/tree/main/plugins/review
agy plugin install https://github.com/j0hanz/j0hanz-marketplace/tree/main/plugins/prompt
agy plugin install https://github.com/j0hanz/j0hanz-marketplace/tree/main/plugins/nodejs
agy plugin install https://github.com/j0hanz/j0hanz-marketplace/tree/main/plugins/typescript-pro
agy plugin install https://github.com/j0hanz/j0hanz-marketplace/tree/main/plugins/writeup
agy plugin install https://github.com/j0hanz/j0hanz-marketplace/tree/main/plugins/groundwork

Check with agy plugin list, or /plugin inside a session. Skills run as slash commands namespaced by plugin, as in Claude Code (/review:code-quality-review). Remove one with /plugin uninstall <name>.

What differs under Antigravity

• Only the plugins above install there so far. Antigravity reads hooks, MCP servers and agent tool lists in its own formats, so a plugin that ships any of them waits until they are ported.
• Antigravity has no switch that keeps the model from picking a skill on its own, so skills that wait for their slash command in Claude Code (disable-model-invocation) can also load unasked.

Plugins

tutor

Teach one topic across many sessions: workspace, spaced repetition, offline HTML lessons sealed behind a retrieval quiz

• Commands: /tutor:teach
• Hooks: SessionStart, Stop

css

Stops agents wrecking your CSS: refuses writes carrying provable defects, advises on performance and accessibility failures

• Commands: /css:css-audit, /css:css-craft, /css:motion-craft
• Hooks: PreToolUse, PostToolUse, Stop, SessionStart

frontend

Designs and reviews frontend UI: invents art-directed page direction from a brief, shapes perceived wait with the right loading pattern, and audits UI code against web interface guidelines

• Commands: /frontend:design, /frontend:guidelines, /frontend:wait
• Hooks: Stop

mcp-hub

MCP development skills for TypeScript SDK v2

• Commands: /mcp-hub:mcp
• Model-loaded skills: mcp-auth, mcp-client, mcp-elicitation, mcp-migration, mcp-planning, mcp-protocol, mcp-router, mcp-server, mcp-test
• Agents: mcp-auditor, mcp-debugger, mcp-migrator
• Hooks: SessionStart, PostToolUse

filesystem-mcp

Project-scoped filesystem MCP tools for batched reads, RE2 search, diffs, and edits. Requires Node.js 24+

• MCP servers: filesystem (stdio)

review

One strict behavior-preserving review of a diff: how the code reads, and how it is shaped

• Commands: /review:code-quality-review

prompt

Rewrites a rough, half-formed prompt into one that works on current Claude models

• Commands: /prompt:prompting

workbench

Every tool for the job on one bench: decide, research, spec, plan, build test-first, debug, refactor, review, audit, verify — plus authoring the skills, hooks and QA docs you reach for next

• Commands: /workbench:architecture-audit, /workbench:bug-hunt, /workbench:clean-code, /workbench:diagnose, /workbench:frontier, /workbench:grilling, /workbench:handoff, /workbench:ideation, /workbench:init, /workbench:plan-hunt, /workbench:prototype, /workbench:qc, /workbench:refactor, /workbench:research, /workbench:run-plan, /workbench:spec-hunt, /workbench:tdd, /workbench:verify-specs, /workbench:write-adr, /workbench:write-hooks, /workbench:write-plan, /workbench:write-qa, /workbench:write-skills, /workbench:write-specs
• Hooks: PreToolUse, SessionStart, UserPromptSubmit, UserPromptExpansion, Stop

output-styles

Set a global output style — Concise, TL;DR, Diagram-first, or Schematic — with /set-style <style> (Claude Code only)

• Commands: /output-styles:set-style
• Hooks: UserPromptExpansion

nodejs

Node.js backend conventions and implementation patterns: framework selection, layered architecture, fail-fast validation, pooled transactions, a single error envelope, graceful drain, plus security and production hardening checklists

• Commands: /nodejs:nodejs-backend-patterns, /nodejs:nodejs-best-practices

typescript-pro

TypeScript type system skills: type-level utilities and type tests, .d.ts declaration contracts for packages and untyped APIs, JSDoc type-checking for plain .js files, and tsconfig selection by runtime

• Commands: /typescript-pro:advanced-types, /typescript-pro:declaration-contracts, /typescript-pro:jsdoc-types, /typescript-pro:tsconfig

writeup

PR descriptions and commit messages written for people: plain prose, structural diagrams, slop flagged on write.

• Commands: /writeup:commit, /writeup:pr, /writeup:show-me, /writeup:unslop
• Hooks: PostToolUse

groundwork

The thinking before the code: grill a plan, keep the domain model in GLOSSARY.md and ADRs, design deep modules, surface deepening opportunities, prototype logic and layouts, research primary sources

• Commands: /groundwork:codebase-design, /groundwork:domain-modeling, /groundwork:grill-with-docs, /groundwork:grilling, /groundwork:improve-codebase-architecture, /groundwork:prototype, /groundwork:research

telltale

See how Claude uses your skills and MCP servers: a receipt under each answer, a pane of every tool call with what Claude read back and did next, context cost per server and skill, per-turn JSONL logs. Observe-only, local files only (Claude Code only)

Requirements

Claude Code, GitHub Copilot CLI or Antigravity CLI, and nothing else. Plugins install from this repo with no build step and no dependencies.

License

MIT