ServiceNow MCP Server

Instructions

Implementation Reference

• src/servicenow_mcp/tools/change_tools.py:584-667 (handler)

  The core handler function for the 'add_change_task' tool. It validates input parameters against AddChangeTaskParams, constructs the payload for creating a change task, retrieves instance URL and headers, and performs a POST request to the ServiceNow '/api/now/table/change_task' endpoint.
  def add_change_task( auth_manager: AuthManager, server_config: ServerConfig, params: Dict[str, Any], ) -> Dict[str, Any]: """ Add a task to a change request in ServiceNow. Args: auth_manager: The authentication manager. server_config: The server configuration. params: The parameters for adding a change task. Returns: The created change task. """ # Unwrap and validate parameters result = _unwrap_and_validate_params( params, AddChangeTaskParams, required_fields=["change_id", "short_description"] ) if not result["success"]: return result validated_params = result["params"] # Prepare the request data data = { "change_request": validated_params.change_id, "short_description": validated_params.short_description, } # Add optional fields if provided if validated_params.description: data["description"] = validated_params.description if validated_params.assigned_to: data["assigned_to"] = validated_params.assigned_to if validated_params.planned_start_date: data["planned_start_date"] = validated_params.planned_start_date if validated_params.planned_end_date: data["planned_end_date"] = validated_params.planned_end_date # 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/change_task" try: response = requests.post(url, json=data, headers=headers) response.raise_for_status() result = response.json() return { "success": True, "message": "Change task added successfully", "change_task": result["result"], } except requests.exceptions.RequestException as e: logger.error(f"Error adding change task: {e}") return { "success": False, "message": f"Error adding change task: {str(e)}", }
• src/servicenow_mcp/tools/change_tools.py:73-82 (schema)

  Pydantic BaseModel schema defining the input parameters for the add_change_task tool, including required fields like change_id and short_description, and optional fields like description, assigned_to, planned dates.
  class AddChangeTaskParams(BaseModel): """Parameters for adding a task to a change request.""" change_id: str = Field(..., description="Change request ID or sys_id") short_description: str = Field(..., description="Short description of the task") description: Optional[str] = Field(None, description="Detailed description of the task") assigned_to: Optional[str] = Field(None, description="User assigned to the task") planned_start_date: Optional[str] = Field(None, description="Planned start date (YYYY-MM-DD HH:MM:SS)") planned_end_date: Optional[str] = Field(None, description="Planned end date (YYYY-MM-DD HH:MM:SS)")
• src/servicenow_mcp/utils/tool_utils.py:518-524 (registration)

  Registers the 'add_change_task' tool in the central tool_definitions dictionary used by the MCP server. Associates the handler function (add_change_task_tool), input schema (AddChangeTaskParams), expected input type (str/JSON), description, and output serialization method ('json_dict').
  "add_change_task": ( add_change_task_tool, AddChangeTaskParams, str, # Expects JSON string "Add a task to a change request", "json_dict", # Tool returns Pydantic model ),
• src/servicenow_mcp/tools/__init__.py:23-32 (registration)

  Imports the add_change_task handler from change_tools.py into the tools package namespace, making it available for re-export and use in higher-level registrations.
  from servicenow_mcp.tools.change_tools import ( add_change_task, approve_change, create_change_request, get_change_request_details, list_change_requests, reject_change, submit_change_for_approval, update_change_request, )
• src/servicenow_mcp/tools/__init__.py:146-146 (registration)

  Explicitly includes 'add_change_task' in the __all__ list, ensuring it is exported when the tools package is imported with 'from servicenow_mcp.tools import *'.
  "add_change_task",