{"contentBlockDelta":{"contentBlockIndex":0,"delta":{"text":"First text block."}}}
{"contentBlockDelta":{"contentBlockIndex":1,"delta":{"text":"Second text block."}}}
{"contentBlockDelta":{"contentBlockIndex":2,"delta":{"text":"Third block."}}}
{"contentBlockStart":{"contentBlockIndex":3,"start":{"toolUse":{"toolUseId":"json-tool-id","name":"json"}}}}
{"contentBlockDelta":{"contentBlockIndex":3,"delta":{"toolUse":{"input":"{\"result\":42}"}}}}
{"contentBlockStop":{"contentBlockIndex":3}}
{"messageStop":{"stopReason":"tool_use"}}
