CCAF : Domain 1 : stop_reason

https://platform.claude.com/docs/en/build-with-claude/handling-stop-reasons

https://www.youtube.com/watch?v=ldqOnljDINc

When calling the Claude Messages API, the stop_reason field in a successful (http 200)  response explains why the model finished generating.

You should evaluate this field to determine your next step: accepting the response, continuing the conversation, retrying, or falling back to an alternative model. Note that this field is completely omitted if the request encounters an API error or processing failure.

How to use it:- Check this field to decide if you should use the output as-is, continue the prompt sequence, retry, or switch to a backup model.

Exceptions:- This field is not included if the API request fails or throws an error.

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• ok