Plugins Overview
Plugins are AI tool extensions from multiple ecosystems — MCP servers, Claude Code plugins, Gemini CLI extensions, Dify plugins, and more. They extend what your AI assistant can do by providing specialized tools, integrations, and capabilities.
What is a Plugin?
A plugin is a PLUGIN.md file or registry entry that defines:
- YAML frontmatter — metadata like name, description, platform, install command, capabilities, and environment variables
- Markdown body — detailed usage instructions, configuration guides, and examples
Unlike skills (which teach AI how to do things) and personas (which define AI personality), plugins provide tools — concrete capabilities like file system access, web search, database connections, or API integrations.
Supported Platforms
Plugins on the marketplace come from these ecosystems:
- MCP (Model Context Protocol) — Servers that provide tools to Claude Desktop, Claude Code, and other MCP-compatible clients
- Claude Code — Native plugins for the Claude Code CLI
- Gemini CLI — Extensions for Google's Gemini CLI
- Dify — Plugins for the Dify AI application platform
- GitHub Copilot — Extensions for Copilot
- Claude Cowork — Collaborative AI workspace plugins
The Plugins Marketplace
Browse and discover plugins at /marketplace?tab=plugins. You can:
- Search by title, description, or tags
- Filter by platform (MCP, Claude Code, etc.)
- Filter by category
- Sort by newest, most downloaded, or highest rated
- View install commands and configuration requirements
Note: Plugins unlock at 50 fluency points. Complete workflows to earn points and unlock access to the plugins marketplace.
Plugin Categories
Plugins are organized into these categories:
- development — code execution, language servers, IDE integrations
- devops — deployment, CI/CD, infrastructure tools
- data — database connections, data pipelines, analytics
- design — image generation, design tools, Figma integrations
- testing — test runners, coverage tools, validation
- security — vulnerability scanners, secret management
- documentation — docs generators, API documentation tools
- automation — workflow automation, task scheduling
- productivity — note-taking, calendar, task management
- communication — email, messaging, notifications
- other — plugins that don't fit the above categories
Installing Plugins
Each plugin includes an install command specific to its platform. For example:
- MCP servers:
npx @modelcontextprotocol/server-filesystem - Claude Code plugins: Added via Claude Code configuration
- npm packages:
npm install package-name
Check each plugin's detail page for specific installation instructions, required environment variables, and configuration steps.
Next Steps
- PLUGIN.md Format Reference — learn the complete specification for plugin files
- Browse Plugins — discover available plugins
- MCP Server Documentation — learn about KillerSkills' own MCP integration