Retell AI API
states body parameter removal on PATCH /update-retell-llm/{id}
Stops workingSubscribe to Retell AI APIShare
On February 1, 2027, the states body parameter on PATCH /update-retell-llm/{id} will stop working as Retell retires multi-prompt agents in favor of conversation flow. Requests sent to this endpoint with this parameter after that date will fail.
Calls it hits
PATCH /update-retell-llm/{id}body parameter states
What to use instead of these calls
Edit the agent as a conversation flow with PATCH /update-conversation-flow/{conversation_flow_id} instead. Because multi-prompt agents have no direct API equivalent, rebuilding an agent as a conversation flow changes how it handles calls and requires testing.
Multi-prompt agents have no direct API equivalent: rebuilding one as a conversation flow changes how it handles calls and needs testing.
In Retell AI API's words
Retell is retiring multi-prompt agents in favor of conversation flow. New multi-prompt creation ends on 12/15/2026, and editing ends on 02/01/2027.
Facts
- API
- Retell AI API
api.retellai.com - Kind
- Parameter removal
- Takes effect
- February 1, 2027
- 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-retell-llm/{id}, body parameter states on Retell AI API stop working on February 1, 2027.
What happens to calls after February 1, 2027?
They fail from that day.
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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Is your code calling this?
Okapi finds the calls this change hits in your repo and opens the pull request with the fix before February 1, 2027.