{
  "model": "claude-opus-5",
  "messages": [{"role": "user", "content": "Do something"}],
  "max_tokens": 100,
  "tools": [
    {"name": "act", "description": "acts", "input_schema": {"type": "object", "properties": {}}}
  ],
  "tool_choice": {"type": "tool", "name": "act"}
}