Learn the agent stack

New to the ecosystem? Here's what MCP servers, skills, plugins, and agents are — how each one works, and how they fit together to extend AI assistants like Claude, ChatGPT, and Codex.

How they fit together

Think of an agent as the worker, MCP servers as the tools and data it plugs into, skills as the specialized know-how it loads for a task, and plugins as bundles that package commands, agents, hooks, and MCP servers together for a one-step setup.

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What is an MCP Server?

The bridge between AI agents and your tools and data.

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What is an Agent Skill?

Reusable, specialized know-how you can give any AI agent.

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What is a Claude Code Plugin?

A bundle of commands, agents, hooks, and MCP servers.

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What is an AI Agent (Sub-agent)?

A specialized worker that handles one focused job well.