### Answer Echo Verification is a feature in Retell AI's Agent Handbook that makes your agent repeat back names, phone numbers, and other critical details for confirmation [(1) ]() . For uncommon names, it spells them out letter by letter . When to Enable Echo Verification: Enable this preset for appointment booking, data collection, or any workflow where accurate information capture is critical . How It Works: The agent repeats back critical information to ensure accuracy . For example: "Just to confirm, your first name is Ryan, last name is James — is that correct?" Configuration: Echo Verification is available for voice agents only and uses approximately 190 tokens . It's disabled by default . You can toggle it on from the Agent Handbook panel by clicking the "Agent Handbook" button in the prompt section of your agent settings . Best Practice: Use Echo Verification when collecting important data like contact information or appointment details to minimize errors and ensure the information captured matches what the caller intended .

​ To learn more, see the sources I considered: [[1] Agent Handbook](https://docs.retellai.com/build/agent-handbook) ​

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