New Relic MCP Server

Instructions

Implementation Reference

• newrelic_mcp/server.py:329-341 (handler)

  MCP tool handler function for get_application_metrics. Handles input parameters, initializes client check, calls the NewRelicClient method, and returns JSON-formatted results or errors.

  @mcp.tool()
  async def get_application_metrics(
      app_id: str, names: Optional[List[str]] = None
  ) -> str:
      """Get available metrics for an application"""
      if not client:
          return json.dumps({"error": "New Relic client not initialized"})
  
      try:
          result = await client.get_application_metrics(app_id, names)
          return json.dumps(result, indent=2)
      except Exception as e:
          return json.dumps({"error": str(e)}, indent=2)

• newrelic_mcp/server.py:78-86 (helper)

  Core helper method in NewRelicClient class that constructs the API URL for application metrics and makes the HTTP GET request using _make_request.

  async def get_application_metrics(
      self, app_id: str, names: Optional[List[str]] = None
  ) -> Dict[str, Any]:
      """Get available metrics for an application"""
      url = f"{self.base_url}/applications/{app_id}/metrics.json"
      params = {}
      if names:
          params["name"] = ",".join(names)
      return await self._make_request("GET", url, params=params)