event: message_start
data: {"type":"message_start","message":{"id":"msg_01ContextManagement000000001","type":"message","role":"assistant","content":[],"model":"claude-sonnet-4-5","stop_reason":null,"stop_sequence":null,"stop_details":null,"usage":{"input_tokens":25,"cache_creation_input_tokens":0,"cache_read_input_tokens":0,"output_tokens":1,"service_tier":"standard"}}}

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

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hello there!"}}

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

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null,"stop_details":null},"usage":{"output_tokens":8},"context_management":{"applied_edits":[{"type":"clear_tool_uses_20250919","cleared_input_tokens":1500,"cleared_tool_uses":2}]}}

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