Chapter 03
Level 3 — Extension Systems
Turn Claude Code into a platform — subagents, MCP servers, lifecycle hooks, output styles, and skills.
In this chapter
Sections in this chapter
- I Section→
3.1 Subagents: agent YAML, tool scoping, invocation
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- II Section→
3.2 MCP integration: stdio, SSE, .mcp.json, OAuth
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- III Section→
3.3 Hooks: lifecycle events and permission gates
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- IV Section→
3.4 Output styles: prompts, creation, switching
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- V Section→
3.5 Skills system: SKILL.md, disclosure, bundling
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