Retell AI API
analysis_summary_prompt body parameter removal on PATCH /update-agent/{id}
Stopped workingSubscribe to Retell AI APIShare
On June 15, 2026, Retell AI removed the body parameter analysis_summary_prompt from the endpoint PATCH /update-agent/{id}. Requests sending this parameter fail since that day. This change directly affects any agent updates relying on the legacy prompt field.
Calls it hits
PATCH /update-agent/{id}body parameter analysis_summary_prompt
What to use instead of these calls
Add a system preset item to post_call_analysis_data instead, setting type to system-presets, name to call_summary, and description to your prompt.
In Retell AI API's words
1. The three prompt fields above will be removed from the API.
Facts
- API
- Retell AI API
api.retellai.com - Kind
- Parameter removal
- Takes effect
- June 15, 2026
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
- Verified
- , against Retell AI API's own pages
Questions
When does this change take effect?
Calls to PATCH /update-agent/{id}, body parameter analysis_summary_prompt on Retell AI API stopped working on June 15, 2026.
What happens to calls after June 15, 2026?
They have failed since June 15, 2026.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
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You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.