List MCPs

{  "items": [    {      "id": null,      "origin": "catalog",      "kind": "builtin",      "display_name": "string",      "server_url": "http://example.com",      "gateway_url": "http://example.com",      "available_tools": [        {          "name": "string",          "description": "string",          "input_schema": {            "property1": null,            "property2": null          }        }      ],      "config": {        "catalog_slug": "string",        "mode": "embedded",        "byo_client_id": "string",        "token_endpoint_auth_method": "client_secret_basic"      },      "created_at": "2019-08-24T14:15:22Z",      "updated_at": "2019-08-24T14:15:22Z"    }  ]}

{  "code": "bad_request",  "message": "string",  "validation_errors": [    {      "field": "string",      "message": "string",      "rule": "string"    }  ]}