When a call is completed with one of my voice bots no Summary is outputted even though I have a prompt set up for both. Why would I not be getting an output for them when in the past I did? here is my JSON response: "analysis": { "structuredData": { "outcome": "pass" }, "successEvaluation": "40" }, it doesnt even match the expected response. Attached is a screen shot of what is expected I also have 'Summary', 'SuccessEvaluation', and 'Structured Data' , configured in my settings https://cdn.discordapp.com/attachments/1422307532319490109/1422307532877201418/Screenshot_2025-09-28_at_12.56.32_PM.png?ex=68dc329d&is=68dae11d&hm=0c78cd51826a158e157a32b4ff41aa28a9674ff6cd215419b81163e3dc112b80&

Suggestion: Double-check that your assistant's

analysisPlan

includes a non-empty

summaryPrompt

. If the prompt is blank or missing, the summary will not be generated—even if it appears configured in the UI. Try editing and re-saving the summary prompt in your assistant settings, then run a new test call to verify the summary output appears as expected.

json
{
  "analysisPlan": {
    "summaryPrompt": "You are an expert note-taker. Summarize the call in 2-3 sentences."
  }
}

If the issue persists, ensure your changes are saved and applied to the correct assistant instance. (Source: [Vapi documentation on call analysis customization](https://docs.vapi.ai/assistants/call-analysis))

its not empty

It looks like the bot isn’t sending back the summary field even though you’ve set it up, which usually means the structured output isn’t being triggered properly at the end of the call. I can help you sort out why the response doesn’t match the expected schema and make sure summary, successEvaluation, and structuredData all show up. Quick questio, are you using the default VAPI schema or did you set up a custom one? @Devin

i used a custom one @Vercel

since you’re using a custom schema, the issue is probably that it isn’t fully aligned with the expected format. I can take a closer look at your setup and help adjust it so the assistant always returns summary, successEvaluation, and structuredData the way you need. Want to connect privately so I can walk you through fixing the schema step by step? @Devin

sure

Alright @Devin , Since summaries work on shorter calls but not on longer ones, it sounds less like a schema issue and more like a token/length limit or the assistant not finalizing the analysis on longer interactions. I can help you adjust the setup so it consistently outputs the summary no matter the call length. Want me to walk you through a couple fixes privately?

yes please. by the way a couple weeks ago it was working properly

if it was working fine a couple weeks ago but now only fails on longer calls, it’s likely something with limits or how the assistant wraps up the analysis. I can take a closer look and help fix it so the summaries always show up. Let’s chat privately and I’ll guide you through it.

okay i messaged you @Vercel

Hi Devin, If you have any questions or need assistance with any of our recent updates, such as Tool Calling Updates, Workflow Steps enhancements, or improvements in Trieve Knowledge Base integration, feel free to ask. You can also refer to our comprehensive [changelog](https://docs.vapi.ai/changelog/2025/1/22) for detailed information on the latest features and updates.