For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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Changelog

Stay up to date with the latest changes to Synthflow.
March 6, 2026
March 6, 2026

Custom end-call reasons

You can now define custom conditions that trigger automatic call termination using the new end_call_reasons field on the Agent schema. When the AI agent detects one of these conditions during a conversation, it says a brief farewell and ends the call. This works with both simple prompt and Flow Designer agents.

Updated endpoints:

EndpointTitle
POST /assistantsCreate an agent
PUT /assistants/{model_id}Update an agent

New response fields:

When a call ends due to a custom end-call reason, the post-call webhook response includes:

FieldDescription
end_call_reasonSet to custom_end_call
custom_end_call_reasonThe specific user-defined reason that triggered call termination

For more details, see the End-Call Reasons documentation.

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