ServiceNow MCP Server

Instructions

Implementation Reference

• src/servicenow_mcp/tools/changeset_tools.py:694-768 (handler)

  The main handler function implementing the tool logic: validates params, constructs API request to POST file data to sys_update_xml table in ServiceNow.

  def add_file_to_changeset(
      auth_manager: AuthManager,
      server_config: ServerConfig,
      params: Union[Dict[str, Any], AddFileToChangesetParams],
  ) -> Dict[str, Any]:
      """
      Add a file to a changeset in ServiceNow.
  
      Args:
          auth_manager: The authentication manager.
          server_config: The server configuration.
          params: The parameters for adding a file to a changeset. Can be a dictionary or a AddFileToChangesetParams object.
  
      Returns:
          The result of the add file operation.
      """
      # Unwrap and validate parameters
      result = _unwrap_and_validate_params(
          params, 
          AddFileToChangesetParams, 
          required_fields=["changeset_id", "file_path", "file_content"]
      )
      
      if not result["success"]:
          return result
      
      validated_params = result["params"]
      
      # 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"
      
      # Prepare the request data for adding a file
      data = {
          "update_set": validated_params.changeset_id,
          "name": validated_params.file_path,
          "payload": validated_params.file_content,
          "type": "file",
      }
      
      # Make the API request
      url = f"{instance_url}/api/now/table/sys_update_xml"
      
      try:
          response = requests.post(url, json=data, headers=headers)
          response.raise_for_status()
          
          result = response.json()
          
          return {
              "success": True,
              "message": "File added to changeset successfully",
              "file": result["result"],
          }
      except requests.exceptions.RequestException as e:
          logger.error(f"Error adding file to changeset: {e}")
          return {
              "success": False,
              "message": f"Error adding file to changeset: {str(e)}",
          } 

• src/servicenow_mcp/tools/changeset_tools.py:73-79 (schema)

  Pydantic model defining input schema: changeset_id (str, required), file_path (str, required), file_content (str, required).

  class AddFileToChangesetParams(BaseModel):
      """Parameters for adding a file to a changeset."""
  
      changeset_id: str = Field(..., description="Changeset ID or sys_id")
      file_path: str = Field(..., description="Path of the file to add")
      file_content: str = Field(..., description="Content of the file")

• src/servicenow_mcp/utils/tool_utils.py:663-669 (registration)

  Tool registration in get_tool_definitions(): maps 'add_file_to_changeset' to handler function, params model, return type str, description, and serialization 'str'.

  "add_file_to_changeset": (
      add_file_to_changeset_tool,
      AddFileToChangesetParams,
      str,
      "Add a file to a changeset in ServiceNow",
      "str",  # Tool returns simple message
  ),