event: message_start
data: {"type":"message_start","message":{"id":"msg_01RefusalTestMessage123456789","type":"message","role":"assistant","content":[],"model":"claude-opus-4-7","stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":20,"output_tokens":1}}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"refusal","stop_sequence":null,"stop_details":{"type":"refusal","category":"cyber","explanation":"This request was refused due to policy."}},"usage":{"output_tokens":0}}

event: message_stop
data: {"type":"message_stop"}
