ServiceNow MCP Server

Instructions

Implementation Reference

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

  Main handler function that executes the create_changeset tool: validates params, makes POST request to ServiceNow sys_update_set table, returns success or error.

  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 model defining input parameters for create_changeset tool.

  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:635-641 (registration)

  MCP tool registration in get_tool_definitions(): maps 'create_changeset' to handler function alias, schema, description, etc.

  "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:104-106 (registration)

  Import and alias of the create_changeset handler for use in MCP tool definitions.

  from servicenow_mcp.tools.changeset_tools import (
      create_changeset as create_changeset_tool,
  )