Function stopReason

pkg/runtime/sampling.go:256–267

stopReason maps a chat finish reason into the MCP stopReason vocabulary used in CreateMessageResult. Unknown values fall back to "endTurn", which is the protocol's default for a normal assistant turn.

(fr chat.FinishReason)

// used in CreateMessageResult. Unknown values fall back to "endTurn",
// which is the protocol's default for a normal assistant turn.
func stopReason(fr chat.FinishReason) string {
	switch fr {
	case chat.FinishReasonStop:
		return "endTurn"
	case chat.FinishReasonLength:
		return "maxTokens"
	case chat.FinishReasonToolCalls:
		return "toolUse"
	default:
		return "endTurn"
	}
}