Retell AI API · Endpoint removal
analysis_summary_prompt on PATCH /update-agent/{} stops working
Stopped working
Calls to PATCH /update-agent/{}, body parameter analysis_summary_prompt on Retell AI API stopped working on June 15, 2026.
What to use instead of these calls
Add a system preset item to post_call_analysis_data (type system-presets, name call_summary, description your prompt) instead.
Calls it hits
PATCH /update-agent/{}body parameter analysis_summary_prompt
1. The three prompt fields above will be removed from the API.
Facts
- API
- Retell AI API
api.retellai.com - Kind
- Endpoint removal
- Takes effect
- June 15, 2026
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
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