ServiceNow MCP Server

Instructions

Implementation Reference

• src/servicenow_mcp/tools/story_tools.py:469-558 (handler)

  The main handler function that implements the list_story_dependencies tool logic, querying the ServiceNow API for story dependencies based on parameters.

  def list_story_dependencies(
      auth_manager: AuthManager,
      server_config: ServerConfig,
      params: Dict[str, Any],
  ) -> Dict[str, Any]:
      """
      List story dependencies from ServiceNow.
  
      Args:
          auth_manager: The authentication manager.
          server_config: The server configuration.
          params: The parameters for listing story dependencies.
  
      Returns:
          A list of story dependencies.
      """
      # Unwrap and validate parameters
      result = _unwrap_and_validate_params(
          params, 
          ListStoryDependenciesParams
      )
      
      if not result["success"]:
          return result
      
      validated_params = result["params"]
      
      # Build the query
      query_parts = []
      
      if validated_params.dependent_story:
          query_parts.append(f"dependent_story={validated_params.dependent_story}")
      if validated_params.prerequisite_story:
          query_parts.append(f"prerequisite_story={validated_params.prerequisite_story}")
      
      # Add any additional query string
      if validated_params.query:
          query_parts.append(validated_params.query)
      
      # Combine query parts
      query = "^".join(query_parts) if query_parts else ""
      
      # 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",
          }
      
      # Make the API request
      url = f"{instance_url}/api/now/table/m2m_story_dependencies"
      
      params = {
          "sysparm_limit": validated_params.limit,
          "sysparm_offset": validated_params.offset,
          "sysparm_query": query,
          "sysparm_display_value": "true",
      }
      
      try:
          response = requests.get(url, headers=headers, params=params)
          response.raise_for_status()
          
          result = response.json()
          
          # Handle the case where result["result"] is a list
          story_dependencies = result.get("result", [])
          count = len(story_dependencies)
          
          return {
              "success": True,
              "story_dependencies": story_dependencies,
              "count": count,
              "total": count,  # Use count as total if total is not provided
          }
      except requests.exceptions.RequestException as e:
          logger.error(f"Error listing story dependencies: {e}")
          return {
              "success": False,
              "message": f"Error listing story dependencies: {str(e)}",
          }

• src/servicenow_mcp/tools/story_tools.py:61-69 (schema)

  Pydantic model defining the input parameters for the list_story_dependencies tool, including pagination and filtering options.

  class ListStoryDependenciesParams(BaseModel):
      """Parameters for listing story dependencies."""
  
      limit: Optional[int] = Field(10, description="Maximum number of records to return")
      offset: Optional[int] = Field(0, description="Offset to start from")
      query: Optional[str] = Field(None, description="Additional query string")
      dependent_story: Optional[str] = Field(None, description="Sys_id of the dependent story is required")
      prerequisite_story: Optional[str] = Field(None, description="Sys_id that this story depends on is required")

• src/servicenow_mcp/utils/tool_utils.py:858-863 (registration)

  Registration of the tool in the central tool definitions dictionary, mapping name to handler, schema, description, etc.

  "list_story_dependencies": (
      list_story_dependencies_tool,
      ListStoryDependenciesParams,
      str,  # Expects JSON string
      "List story dependencies from ServiceNow",
      "json",  # Tool returns list/dict