ServiceNow MCP Server

Instructions

Implementation Reference

• src/servicenow_mcp/tools/workflow_tools.py:776-840 (handler)

  Main handler function for the update_workflow_activity tool. Handles input parameters, makes a PATCH request to ServiceNow's wf_activity table to update the activity.

  def update_workflow_activity(
      auth_manager: AuthManager,
      server_config: ServerConfig,
      params: Dict[str, Any],
  ) -> Dict[str, Any]:
      """
      Update an existing activity in a workflow.
      
      Args:
          auth_manager: Authentication manager
          server_config: Server configuration
          params: Parameters for updating a workflow activity
          
      Returns:
          Dict[str, Any]: Updated workflow activity details
      """
      # Unwrap parameters if needed
      params = _unwrap_params(params, UpdateWorkflowActivityParams)
      
      # Get the correct auth_manager and server_config
      try:
          auth_manager, server_config = _get_auth_and_config(auth_manager, server_config)
      except ValueError as e:
          logger.error(f"Error getting auth and config: {e}")
          return {"error": str(e)}
      
      activity_id = params.get("activity_id")
      if not activity_id:
          return {"error": "Activity ID is required"}
      
      # Prepare data for the API request
      data = {}
      
      if params.get("name"):
          data["name"] = params["name"]
      
      if params.get("description") is not None:
          data["description"] = params["description"]
      
      if params.get("attributes"):
          # Add any additional attributes
          data.update(params["attributes"])
      
      if not data:
          return {"error": "No update parameters provided"}
      
      # Make the API request
      try:
          headers = auth_manager.get_headers()
          url = f"{server_config.instance_url}/api/now/table/wf_activity/{activity_id}"
          
          response = requests.patch(url, headers=headers, json=data)
          response.raise_for_status()
          
          result = response.json()
          return {
              "activity": result.get("result", {}),
              "message": "Activity updated successfully",
          }
      except requests.RequestException as e:
          logger.error(f"Error updating workflow activity: {e}")
          return {"error": str(e)}
      except Exception as e:
          logger.error(f"Unexpected error updating workflow activity: {e}")
          return {"error": str(e)}

• src/servicenow_mcp/tools/workflow_tools.py:98-104 (schema)

  Pydantic model defining the input parameters for the update_workflow_activity tool, including activity_id (required), optional name, description, and attributes.

  class UpdateWorkflowActivityParams(BaseModel):
      """Parameters for updating a workflow activity."""
      
      activity_id: str = Field(..., description="Activity ID or sys_id")
      name: Optional[str] = Field(None, description="Name of the activity")
      description: Optional[str] = Field(None, description="Description of the activity")
      attributes: Optional[Dict[str, Any]] = Field(None, description="Additional attributes for the activity")

• src/servicenow_mcp/utils/tool_utils.py:599-605 (registration)

  Tool registration in the central tool_definitions dictionary. Maps the tool name to its handler (aliased import), schema, return type hint, description, and serialization method for MCP server integration.

  "update_workflow_activity": (
      update_workflow_activity_tool,
      UpdateWorkflowActivityParams,
      str,  # Expects JSON string
      "Update an existing activity in a workflow",
      "json_dict",  # Tool returns Pydantic model
  ),