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Every Tool Parameter Is a Question Your Voice Agent Has to Ask

If you have ever designed a REST endpoint, you already know most of what it takes to give a voice agent tools. Name it well, keep the parameters tight, validate inputs, return something useful.

  • Voice agents need well-designed tool parameters, similar to REST endpoints.
  • Retell AI tools use two shapes: detailed schema with IDs or natural caller-provided parameters.
  • Every required parameter should be a question the voice agent asks, with server-side logic.

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