LibraLM MCP Server

Instructions

Implementation Reference

• libralm_mcp_server.py:158-165 (handler)

  The handler function decorated with @mcp.tool() that implements the get_book_summary tool. It fetches the book summary by making an authenticated API request to the LibraLM API endpoint /books/{book_id}/summary.

  @mcp.tool()
  def get_book_summary(book_id: str) -> str:
      """Get the main summary for a book"""
      try:
          data = _make_api_request(f"/books/{book_id}/summary")
          return data.get("summary", "")
      except Exception as e:
          raise ValueError(f"Error getting summary for book '{book_id}': {str(e)}")

• libralm_mcp_server.py:103-128 (helper)

  Supporting helper function used by the get_book_summary handler to perform authenticated API requests to the LibraLM service.

  def _make_api_request(endpoint: str) -> dict:
      """Make an authenticated request to the LibraLM API"""
      # Get API key and base URL from request context or environment
      api_key = get_api_key()
      base_url = get_api_base_url()
  
      headers = {"x-api-key": api_key, "Content-Type": "application/json"}
  
      url = f"{base_url}{endpoint}"
      response = requests.get(url, headers=headers)
  
      if response.status_code == 401:
          raise ValueError("Invalid API key. Please check your LibraLM API key.")
      elif response.status_code == 404:
          raise ValueError(f"Resource not found: {endpoint}")
      elif response.status_code != 200:
          raise ValueError(
              f"API request failed with status {response.status_code}: {response.text}"
          )
  
      # Handle wrapped response format from Lambda
      result = response.json()
      if isinstance(result, dict) and "data" in result:
          return result["data"]
      return result

• libralm_mcp_server.py:158-158 (registration)

  The @mcp.tool() decorator registers the get_book_summary function as an MCP tool.

  @mcp.tool()