{
    "tools": [
        {
            "name": "example_echo",
            "description": "Example tool that echoes input",
            "command": [
                "echo",
                "{message}"
            ],
            "args": {
                "message": "^[a-zA-Z0-9_ -]+$"
            },
            "timeout_sec": 5,
            "max_output_bytes": 1024
        }
    ]
}