event: message_start
data: {"type":"message_start","message":{"id":"msg_01","type":"message","role":"assistant","model":"claude-fixture","usage":{"input_tokens":88,"cache_read_input_tokens":0,"cache_creation_input_tokens":0}}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"tool_use","id":"toolu_01ABC","name":"read_file"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":"{\"path\":"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":"\"main.go\"}"}}

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

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"tool_use"},"usage":{"output_tokens":31}}

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