{"message":{"role":"assistant","type":"message","model":"claude-sonnet-4-6-20260401","stop_reason":"tool_use","usage":{"input_tokens":1234,"output_tokens":567,"cache_read_input_tokens":89,"cache_creation_input_tokens":21},"content":[{"type":"text","text":"I am updating the authentication middleware before I run the tests."},{"type":"tool_use","name":"Edit","input":{"file_path":"/src/auth.rs","old_string":"fn check()","new_string":"fn check_auth(token: &str)"}}]}}