How to Test a Retell Agent Without Code (2026 Guide)

A caller's experience with a Retell agent, who incorrectly promised a refund policy, led to an exploration of testing the agent with TestMu AI without coding. The author explains how they used TestMu AI to simulate calls and verify the agent's adherence to company policies, focusing on confirming order numbers and accurately quoting refund policies. The AI testing tool eliminated the need for coding by allowing the user to input scenarios and parameters, which were then scored across various metrics to ensure compliance. The session highlighted the agent's performance under different conditions, such as regional accents, poor connections, and challenging customer interactions, identifying areas for improvement. Ultimately, the process established a method for ongoing, automated testing of the agent to catch discrepancies before they affect real customers, integrating the testing into daily operations and alerting the team to issues via Slack.

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