Tool Registry with Schema Validation
A tool the agent cannot validate is a tool the agent cannot call. Build the registry and the schema checker before you build the tools.
Prerequisites: Phase 13 lessons 01-07, Phase 14 lesson 01
#Learning Objectives
- Hold a typed registry of tool name → schema → handler that the dispatcher can ask once and trust afterwards.
- Implement a JSON Schema 2020-12 subset that covers the keywords ninety percent of tool calls actually use.
- Return precise, json-pointer-shaped error paths so the model can self-correct in one round trip.
- Reject re-registration without explicit override, since silent overwrites are how production tool catalogs drift.
- Keep the validator pure (no I/O, no time, no globals) so it can be re-run on a replay log.
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The text and code of this lesson are based on AI Engineering from Scratch by Rohit Ghumare, MIT licensed.