Stop reason handling — CCA-F Exam Prep

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MYSTERYA customer support dashboard showing a conversation. The agent's last message cuts off mid-sentence: 'Based on your account history, I recommend you switch to the Premium plan because it offers—' No tool calls. No error. Just... stopped. A support manager squinting at the screen.

For 3% of customers, the agent's response just stopped mid-sentence. No error. No crash. Just silence.

A fintech company deployed a Claude-powered support agent. It worked flawlessly for most users. But about 3% of conversations ended with the agent cutting off mid-response. The team spent two weeks debugging the model, the prompts, the tools. Everything looked correct.