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Layer 3: Tool System

中文 | English

Core Question

How does Claude Code define tools, register them, and dispatch model tool calls into local execution?

Run First

python examples/l3_tool_system.py

Read First

  • Tool.ts
  • tools.ts
  • tools/BashTool/
  • tools/FileReadTool/

Search Anchors

  • buildTool
  • getTools
  • inputSchema
  • call

What To Notice

  • why the model only sees schema and description
  • why the implementation stays hidden from the model
  • why registration and filtering live in their own layer

Demo vs Real Source

The demo keeps only a few tools and simplified permission logic. The real repo adds richer tool context, UI components, error handling, and filtering.

Questions To Answer

  1. Why is the “schema plus function” boundary so important?
  2. If you change implementation but not schema, does the model’s calling strategy change?
  3. Why is a tool registry better than scattering tool logic everywhere?