get_card_query_results

Instructions

Implementation Reference

• src/metabase_mcp_server.py:335-347 (handler)

  The main handler function for 'get_card_query_results' tool. It's decorated with @mcp.tool() to register it as an MCP tool. The function takes a card_id (int) and makes a POST request to the Metabase API endpoint /api/card/{card_id}/query to retrieve query results.

  @mcp.tool()
  async def get_card_query_results(card_id: int) -> Dict[str, Any]:
      """
      Get the results of a card's query.
      
      Args:
          card_id (int): ID of the card.
          
      Returns:
          Dict[str, Any]: Query result data.
      """
      logger.info(f"Getting query results for card {card_id}")
      return await make_metabase_request(RequestMethod.POST, f"/api/card/{card_id}/query")

• src/metabase_mcp_server.py:159-160 (registration)

  Initialization of the FastMCP instance named 'metabase' which serves as the MCP server. Tools are registered via the @mcp.tool() decorator.

  # Initialize FastMCP agent
  mcp = FastMCP("metabase", lifespan=app_lifespan)

• src/metabase_mcp_server.py:162-247 (helper)

  The 'make_metabase_request' helper function that handles all HTTP communication with the Metabase API. It manages session handling, authentication via API key, error handling with custom exceptions, and response parsing.

  async def make_metabase_request(
      method: RequestMethod,
      endpoint: str,
      data: Optional[Dict[str, Any] | bytes] = None,
      params: Optional[Dict[str, Any]] = None,
      json: Any = None,
      headers: Optional[Dict[str, str]] = None,
  ) -> Dict[str, Any]:
      """
      Make a request to the Metabase API.
      
      Args:
          method: HTTP method to use (GET, POST, PUT, DELETE)
          endpoint: API endpoint path
          data: Request data (for form data)
          params: URL parameters
          json: JSON request body
          headers: Additional headers
          
      Returns:
          Dict[str, Any]: Response data
          
      Raises:
          MetabaseConnectionError: When the Metabase server is unreachable
          MetabaseResponseError: When Metabase returns a non-2xx status code
          RuntimeError: For other errors
      """
      
      if not METABASE_URL or not METABASE_API_KEY:
          raise RuntimeError("METABASE_URL or METABASE_API_KEY environment variable is not set. Metabase API requests will fail.")
  
      if session is None:
          raise RuntimeError("HTTP session is not initialized. Ensure app_lifespan was called.")
  
      try:
          request_headers = headers or {}
          
          logger.debug(f"Making {method.name} request to {METABASE_URL}{endpoint}")
          
          # Log request payload for debugging (omit sensitive info)
          if json and logger.level <= logging.DEBUG:
              sanitized_json = {**json}
              if 'password' in sanitized_json:
                  sanitized_json['password'] = '********'
              logger.debug(f"Request payload: {sanitized_json}")
              
          response = await session.request(
              method=method.name,
              url=endpoint,
              timeout=aiohttp.ClientTimeout(total=30),
              headers=request_headers,
              data=data,
              params=params,
              json=json,
          )
  
          try:
              # Handle 500 errors with more detailed info
              if response.status >= 500:
                  error_text = await response.text()
                  logger.error(f"Server error {response.status}: {error_text[:200]}")
                  raise MetabaseResponseError(response.status, f"Server Error: {error_text[:200]}", endpoint)
              
              response.raise_for_status()
              response_data = await response.json()
              
              # Ensure the response is a dictionary for FastMCP compatibility
              return ensure_dict_response(response_data)
              
          except aiohttp.ContentTypeError:
              # Handle empty responses or non-JSON responses
              content = await response.text()
              if not content:
                  return {"data": {}}
              logger.warning(f"Received non-JSON response: {content}")
              return {"data": content}
  
      except aiohttp.ClientConnectionError as e:
          logger.error(f"Connection error: {str(e)}")
          raise MetabaseConnectionError("Metabase is unreachable. Is the Metabase server running?") from e
      except aiohttp.ClientResponseError as e:
          logger.error(f"Response error: {e.status}, {e.message}, {e.request_info.url}")
          raise MetabaseResponseError(e.status, e.message, str(e.request_info.url)) from e
      except Exception as e:
          logger.error(f"Request error: {str(e)}")
          raise RuntimeError(f"Request error: {str(e)}") from e

• src/enums/request_enum.py:1-11 (helper)

  RequestMethod enum defining HTTP methods (GET, POST, PUT, DELETE) used by the tool to specify the request type when calling make_metabase_request.

  from enum import Enum, auto
  
  class RequestMethod(Enum):
      GET = auto()
      POST = auto()
      PUT = auto()
      DELETE = auto()
  
      def __str__(self):
          return self.name