{"type":"user","message":{"role":"user","content":"List the files in this directory."}}
{"type":"assistant","message":{"role":"assistant","stop_reason":"tool_use","content":[{"type":"tool_use","name":"Bash","input":{"command":"ls"}}]}}
{"type":"user","message":{"role":"user","content":[{"type":"tool_result","content":"foo.rs\nbar.rs"}]}}