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Every iteration on an agent should pass through the Tester before going live. The tester runs the agent’s draft version end-to-end with a browser-based microphone, so you can hear exactly what callers will hear.

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Open the tester

On the agent edit page, click Tester (top-right). A side panel opens with a microphone control, a live transcript, and a tool-call log.

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Test loop

1

Click Start call

The browser will request microphone access. The agent’s draft version is loaded.
2

Talk

Speak as a caller would. Try the happy path first, then push on edge cases.
3

Watch the transcript

The transcript updates in real time. Tool calls show inline with their inputs and outputs.
4

End the call

Click End call when done. The transcript persists in your test history for the session.

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What to test

A good pre-publish test plan covers:

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Reading the tool-call log

Each tool invocation logs:
  • Tool name and the arguments the LLM filled
  • The action sequence that ran
  • Any error with the failing step
If the agent calls the wrong tool, the fix is usually in the tool description (the LLM read it and got the wrong cue). If the agent calls the right tool with bad arguments, the fix is in the parameter descriptions.

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Tester vs real call

The tester is faithful to almost everything but:
  • Phone audio quality (compressed, ~8kHz)
  • Real-world background noise
  • Cellular jitter
For high-stakes agents (sales, medical), always also place a few real calls from your phone before publishing widely.

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Iterating fast

A good loop:
  1. Edit the prompt or a tool
  2. Click Test without leaving the page (the tester picks up draft changes immediately)
  3. Run the same 3-5 scenarios you ran last time
  4. Save and repeat
Don’t republish between every iteration — the published version is what real callers hit.