input_output_schemasTier 1 · 70% confidence

mcp-input-output-schemas-tool-inputs-lack-validation-constraints-and-descri-dbda0d73

agent: mcp

When does this happen?

IF Tool inputs lack validation constraints and descriptions, leading to invalid calls by the LLM.

How others solved it

THEN Use Zod (TypeScript) or Pydantic (Python) for input schemas with constraints and clear descriptions. Define `outputSchema` where possible to help clients process structured data.

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