ServiceNow MCP Server

Instructions

Implementation Reference

• src/servicenow_mcp/tools/changeset_tools.py:368-447 (handler)

  The main handler function that implements the create_changeset tool. It validates parameters using CreateChangesetParams, prepares data, and makes a POST request to the ServiceNow sys_update_set table to create a new changeset.
  def create_changeset( auth_manager: AuthManager, server_config: ServerConfig, params: Union[Dict[str, Any], CreateChangesetParams], ) -> Dict[str, Any]: """ Create a new changeset in ServiceNow. Args: auth_manager: The authentication manager. server_config: The server configuration. params: The parameters for creating a changeset. Can be a dictionary or a CreateChangesetParams object. Returns: The created changeset. """ # Unwrap and validate parameters result = _unwrap_and_validate_params( params, CreateChangesetParams, required_fields=["name", "application"] ) if not result["success"]: return result validated_params = result["params"] # Prepare the request data data = { "name": validated_params.name, "application": validated_params.application, } # Add optional fields if provided if validated_params.description: data["description"] = validated_params.description if validated_params.developer: data["developer"] = validated_params.developer # Get the instance URL instance_url = _get_instance_url(auth_manager, server_config) if not instance_url: return { "success": False, "message": "Cannot find instance_url in either server_config or auth_manager", } # Get the headers headers = _get_headers(auth_manager, server_config) if not headers: return { "success": False, "message": "Cannot find get_headers method in either auth_manager or server_config", } # Add Content-Type header headers["Content-Type"] = "application/json" # Make the API request url = f"{instance_url}/api/now/table/sys_update_set" try: response = requests.post(url, json=data, headers=headers) response.raise_for_status() result = response.json() return { "success": True, "message": "Changeset created successfully", "changeset": result["result"], } except requests.exceptions.RequestException as e: logger.error(f"Error creating changeset: {e}") return { "success": False, "message": f"Error creating changeset: {str(e)}", }
• src/servicenow_mcp/tools/changeset_tools.py:40-47 (schema)

  Pydantic BaseModel defining the input schema for the create_changeset tool, including required fields name and application, and optional description and developer.
  class CreateChangesetParams(BaseModel): """Parameters for creating a changeset.""" name: str = Field(..., description="Name of the changeset") description: Optional[str] = Field(None, description="Description of the changeset") application: str = Field(..., description="Application the changeset belongs to") developer: Optional[str] = Field(None, description="Developer responsible for the changeset")
• src/servicenow_mcp/utils/tool_utils.py:589-595 (registration)

  Registration of the create_changeset tool in the central tool definitions dictionary used by the MCP server. Maps the tool name to its handler (aliased as create_changeset_tool), input schema, return type, description, and serialization method.
  "create_changeset": ( create_changeset_tool, CreateChangesetParams, str, # Expects JSON string "Create a new changeset in ServiceNow", "json_dict", # Tool returns Pydantic model ),
• src/servicenow_mcp/utils/tool_utils.py:105-106 (registration)

  Import and alias of the create_changeset function as create_changeset_tool for use in tool registration.
  create_changeset as create_changeset_tool, )
• src/servicenow_mcp/tools/__init__.py:144-144 (registration)

  Export of create_changeset in the tools __init__.py __all__ list, making it available for imports.
  "create_changeset",