Module 7 · Chapter 4: Tools and MCP
Tool results, errors and repeated calls
In short
The model decides its next step from the tool result alone. Return short, honest results and clear errors with no secrets, and give write tools a per-request idempotency key so retries are safe.
After this lesson you can
- Return tool results and errors a model can understand
- Make write tools safe to repeat with an idempotency key
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