Claude Skills Marketplace

A collection of Claude Code skills and plugins.

Note: This marketplace is under active development and has not yet reached a stable release. Skills may be renamed, reorganized, or change considerably. A stable release is expected soon.

Installation

/plugin marketplace add robbyt/claude-skills

After adding the marketplace, run /exit and restart Claude Code with claude --continue.

To install individual skills:

1. Run /plugin plugins
2. Select Browse and install plugins
3. Select the robbyt-claude-skills marketplace

To update skills:

1. Run /plugin plugins
2. Select Manage and uninstall plugins
3. Select robbyt-claude-skills
4. Select the plugins to update

Requirements

Some plugins require the following tools:

• uv - Python package installer and runner (installation guide)
• jq - JSON processor for parsing tool input

Tool Versions

External formatters are called directly from your PATH:

• ruff - Python formatter (install via uv sync)
• black - Python formatter (install via uv sync)
• gofmt - Go formatter (version matches your installed Go)
• swiftformat - Swift formatter (install via brew install swiftformat)

For reproducible formatting, pin tool versions in your project's dependency files (pyproject.toml, go.mod, etc.).

Security

Claude Code plugins can contain scripts that run on your local computer. Only install plugins from sources you trust. Consider enabling the sandbox feature: /sandbox (see sandboxing docs)

Available Plugins

claude-md

Tools for managing CLAUDE.md memory files. Includes reflect skill for analyzing conversation history to improve memory files. Trigger with reflect on this session or reflect on this conversation.

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codex

Integrates the OpenAI Codex CLI for code reviews, plan review, and codebase analysis. Includes MCP server integration and three skills: diff-review, plan-review, and codebase-analysis. Trigger with use codex to ..., ask codex ..., or have codex review ....

Requirements: Codex CLI (installation guide) with API keys or OAuth configured.

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custom-output-styles

Custom output styles. Ships Programming, a style that has Claude describe things instead of inventing vocabulary for them, while keeping established programming terminology and Claude Code's built-in coding instructions. Opt in with /config → Output style → custom-output-styles:Programming, then /clear. Does not apply to subagents.

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gemini

Integrates the Gemini CLI for code reviews, web search via Google Search, plan review, and codebase analysis. Includes four skills: web-search, diff-review, plan-review, and codebase-analysis. Trigger with use gemini to ... or ask gemini ....

Requirements: Gemini CLI v0.17.0+ (installation guide) with authentication configured.

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gh-cli

Interacts with GitHub using the gh CLI for PR management, stacked pull requests (the gh stack extension), issues, repository operations, GitHub Actions, and viewing GitHub file links. Triggers on gh mentions or GitHub operations such as viewing a github.com link.

Requirements: GitHub CLI (installation guide) with authentication configured (gh auth login).

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go-formatter

Formats Go files with gofmt after Write/Edit/MultiEdit operations. Runs as a PostToolUse hook.

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go-style-guide

Reviews Go code against a style guide combining Google and Uber Go style guides. Identifies issues not typically found by static analysis. Trigger with review this Go code or review my PR.

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python-formatter-black

Formats Python files with black after Write/Edit/MultiEdit operations. Runs as a PostToolUse hook.

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python-formatter-ruff

Formats Python files with ruff after Write/Edit/MultiEdit operations. Runs as a PostToolUse hook. Ruff formats faster than Black.

Note: Do not enable both python-formatter-ruff and python-formatter-black simultaneously, as both will attempt to format the same files.

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swift-formatter

Formats Swift files with swiftformat after Write/Edit/MultiEdit operations. Runs as a PostToolUse hook. Falls back to swift format (built-in) if swiftformat is not installed.

Requirements: swiftformat (install via brew install swiftformat) or Swift toolchain

Read more →

Development

Output styles

Plugins may ship output styles in an output-styles/ directory. Two rules apply to every style of every plugin in the marketplace, and plugins/custom-output-styles/tests/test.sh enforces them across all plugins listed in marketplace.json:

• Every style sets keep-coding-instructions explicitly. The default is false, which silently drops Claude Code's built-in coding instructions.
• At most one plugin in the marketplace may set force-for-plugin: true — two forced styles resolve by plugin load order, which nobody can reason about. Currently none does; users pick a style in /config.

To use locally during development:

/plugin marketplace add /path/to/claude-skills
/plugin install claude-md

License

MIT

{
  "name": "robbyt-claude-skills",
  "owner": {
    "name": "robbyt",
    "email": "robbyt@robbyt.net"
  },
  "metadata": {
    "description": "Collection of Claude Code skills for developer workflows",
    "version": "1.1.0"
  },
  "plugins": [
    {
      "name": "claude-md",
      "description": "Tools for managing CLAUDE.md memory files. Includes reflect skill for analyzing conversation history to improve memory files.",
      "source": "./plugins/claude-md",
      "version": "2.1.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "claude-md",
        "memory",
        "reflection",
        "documentation"
      ],
      "strict": true
    },
    {
      "name": "go-formatter",
      "description": "Automatically format Go files with gofmt after Write/Edit/MultiEdit operations",
      "source": "./plugins/go-formatter",
      "version": "1.0.1",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "go",
        "golang",
        "formatter",
        "gofmt",
        "hooks"
      ],
      "strict": true
    },
    {
      "name": "python-formatter-black",
      "description": "Automatically format Python files with Black after Write/Edit/MultiEdit operations",
      "source": "./plugins/python-formatter-black",
      "version": "1.0.1",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "python",
        "black",
        "formatter",
        "hooks"
      ],
      "strict": true
    },
    {
      "name": "python-formatter-ruff",
      "description": "Automatically format Python files with Ruff after Write/Edit/MultiEdit operations",
      "source": "./plugins/python-formatter-ruff",
      "version": "1.0.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "python",
        "ruff",
        "formatter",
        "hooks"
      ],
      "strict": true
    },
    {
      "name": "swift",
      "description": "Swift development tools: automatic formatting with swift-format, and SwiftData expert guidance for @Model, @Query, @Relationship, migrations, concurrency, and architecture auditing",
      "source": "./plugins/swift",
      "version": "1.0.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "swift",
        "swiftdata",
        "formatter",
        "swift-format",
        "ios",
        "swiftui",
        "persistence",
        "hooks"
      ],
      "strict": true
    },
    {
      "name": "go-style-guide",
      "description": "Review Go code for adherence to Go Style Guide. Use when the user requests a code review of completed work, pull requests, or feature branches in Go projects.",
      "source": "./plugins/go-style-guide",
      "version": "1.1.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "go",
        "golang",
        "style-guide",
        "code-review"
      ],
      "strict": true
    },
    {
      "name": "gemini",
      "description": "Gemini CLI integration with focused skills for web search, plan review, code review, and architecture analysis",
      "source": "./plugins/gemini",
      "version": "2.0.1",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "gemini",
        "ai",
        "code-review",
        "web-search",
        "architecture",
        "plan-review"
      ],
      "strict": true
    },
    {
      "name": "agy",
      "description": "Google Antigravity (agy) CLI integration with focused skills for web search, plan review, code review, and architecture analysis. Replaces the deprecated gemini-cli with Google's new Antigravity CLI.",
      "source": "./plugins/agy",
      "version": "1.0.1",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "agy",
        "antigravity",
        "google",
        "gemini",
        "ai",
        "code-review",
        "web-search",
        "architecture",
        "plan-review"
      ],
      "strict": true
    },
    {
      "name": "gh-cli",
      "description": "GitHub CLI integration with focused skills for pull requests, stacked pull requests, issues, GitHub Actions, and viewing GitHub file URLs",
      "source": "./plugins/gh-cli",
      "version": "2.1.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "github",
        "gh",
        "cli",
        "pull-requests",
        "stacked-pull-requests",
        "issues",
        "actions",
        "api"
      ],
      "strict": true
    },
    {
      "name": "codex",
      "description": "OpenAI Codex CLI integration with a bundled MCP server and read-only skills for web search, plan review, code review, adversarial review, and codebase analysis",
      "source": "./plugins/codex",
      "version": "1.7.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "codex",
        "openai",
        "ai",
        "code-review",
        "web-search",
        "codebase-analysis",
        "plan-review"
      ],
      "strict": true
    },
    {
      "name": "multimedia",
      "description": "Video and audio file analysis, quality auditing, and encoding guidance. Includes skills for video audit, artifact detection, telecine detection, HDR validation, source comparison, and subtitle analysis.",
      "source": "./plugins/multimedia",
      "version": "1.0.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "video",
        "audio",
        "encoding",
        "ffmpeg",
        "mediainfo",
        "quality",
        "hdr",
        "telecine",
        "subtitles"
      ],
      "strict": true
    },
    {
      "name": "api-design",
      "description": "API design review, audit, and architecture guidance based on Google API Improvement Proposals (AIPs). Covers resource-oriented design, standard methods, ETags, idempotency, pagination, error handling, backward compatibility, and BFF/backend separation.",
      "source": "./plugins/api-design",
      "version": "1.0.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "api",
        "api-design",
        "aip",
        "rest",
        "grpc",
        "protobuf",
        "etag",
        "idempotency",
        "pagination",
        "bff",
        "backend",
        "architecture",
        "code-review"
      ],
      "strict": true
    },
    {
      "name": "codex-plan-gate",
      "description": "Routes every plan-mode plan through a Codex MCP review before it is shown. A PreToolUse hook intercepts ExitPlanMode, has Claude consult Codex (read-only) to critique and refine the plan over a capped iterative loop, then lets the refined plan through.",
      "source": "./plugins/codex-plan-gate",
      "version": "0.2.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "codex",
        "hooks",
        "plan-mode",
        "plan-review",
        "pretooluse",
        "mcp"
      ],
      "strict": true
    },
    {
      "name": "custom-output-styles",
      "description": "Custom output styles. Ships the Programming style, which has Claude describe things instead of inventing vocabulary for them while keeping established programming terminology and Claude Code's built-in coding instructions. Opt in with /config.",
      "source": "./plugins/custom-output-styles",
      "version": "1.0.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "output-style",
        "writing",
        "plain-language",
        "communication"
      ],
      "strict": true
    },
    {
      "name": "usage-status",
      "description": "Mod that shows the remaining 5-hour session, 7-day weekly and context window usage as percentages in a row under the prompt, turning yellow when one runs low.",
      "source": "./plugins/usage-status",
      "version": "0.3.0",
      "author": {
        "name": "robbyt"
      },
      "license": "MIT",
      "keywords": [
        "mod",
        "status",
        "usage",
        "rate-limit"
      ],
      "strict": true
    }
  ]
}