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  5. Tool Schema
Agents & Tool Useaka Function Schema

Tool Schema

A tool schema describes an external operation and the structured arguments a model may provide.

Ask Melo about this← all terms

Names and descriptions help the model choose the operation, while types, required fields, and enums constrain its input. The host must still validate arguments and authorize the operation before execution.

Related terms

Chain of ThoughtSubagentHuman in the LoopAutonomous AgentCodex GoalsMechanism

Where Tool Schema comes up

  • Tool definition and schema design: the context engineering layer most teams get wrong in 2026