Claude Code Extensions – Skills, Hooks, MCP, Subagents, and Agent SDK
Lesson 3: MCP, Tool Boundaries, and Subagent Delegation
Lesson Objectives
By the end of this lesson, students should be able to:
- Explain what MCP is for in practical terms.
- Write a scoped subagent delegation.
- Review external-tool access before using it.
Lesson Content
MCP can connect Claude Code to external data and actions. That can be helpful for tickets, documents, code hosts, dashboards, or custom internal tools. It also increases responsibility because the agent may see or change information outside the current project.
Subagents are useful for bounded work such as research, test review, or file inventory. A good subagent task says what to inspect, what to ignore, what output format to return, and what decisions it must not make.
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