The Retell Community is where innovators, call center leaders, and AI enthusiasts come together to share ideas, learn best practices, and explore the future of voice automation. Join to connect with peers, get early access to product updates, and collaborate on building human-like AI voice experiences that transform customer service.

Retell AI

<@1145576664366055464> What is the basis for the call_successful variable?

Thanks for tagging me <@1358772730736152726>. I'll look through relevant sources and get back to you shortly.

Feel free to tag <@1145576664366055464> with additional questions. I also appreciate feedback, it helps me improve.

### Answer
 The `call_successful` variable is determined by a customizable prompt that you define in your agent's Post-Call Data Extraction section [(1) ](<https://docs.retellai.com/features/rerun-call-analysis>) . You can customize the prompt that evaluates whether a call or chat was successful, allowing you to define your own success criteria .

In the agent configuration, you can set the `analysis_successful_prompt` field [(2) ](<https://docs.retellai.com/api-references/get-agent-versions>) . For example, the default prompt might be: "The agent finished the task and the call was complete without being cutoff" .

After a call ends, the `call_successful` boolean field appears in the `call_analysis` object [(3) ](<https://docs.retellai.com/api-references/list-calls>) [(4) ](<https://docs.retellai.com/api-references/register-phone-call>) . The analysis uses the prompt you configured to evaluate the conversation transcript and determine if the call met your success criteria [(1) ](<https://docs.retellai.com/features/rerun-call-analysis>) .

You can update this prompt at any time in your agent's latest draft version, then rerun the post-call analysis to regenerate the `call_successful` value based on your new criteria .

​
To learn more, see the sources I considered:

[[1] Rerun Post-Call/Chat Analysis](https://docs.retellai.com/features/rerun-call-analysis)
[[2] Get Agent Versions](https://docs.retellai.com/api-references/get-agent-versions)
[[3] List Calls](https://docs.retellai.com/api-references/list-calls)
[[4] Register Phone Call](https://docs.retellai.com/api-references/register-phone-call)
​