CCDV-F

By Anthropic · Question Mode

QuestionQ17

Tools and MCPs

A Claude agent can access a tool that retrieves customer records. A teammate observes that the agent sometimes invokes the tool with arguments not declared by its schema, causing the downstream service to return an error each time. The teammate suggests loosening the schema so the tool accepts any arguments the model generates.

How would you respond?

Explanation

Tool schemas establish the valid input contract for a tool. Strict pre-dispatch validation prevents malformed or undeclared arguments from reaching the downstream service, and a structured tool error provides feedback the agent can use to make a corrected retry. Prompting can improve behavior but does not replace validation at the system boundary.

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