"fetch_spies" : {
                        "description": "Sends a specified ship to fetch specified spies from on_body_id, and bring them back to to_body_id. See also prepare_fetch_spies",
                        "parameters": [
                            {"name":"session_id", "type":"string", "optional":false},
                            {"name":"on_body_id", "type":"string", "optional":false},