Bookstore MCP Server

Instructions

Implementation Reference

• src/bookstore_mcp/server.py:103-123 (handler)

  The handler function for the 'restock_book' tool. It adds the specified quantity to the book's stock if the book exists and quantity > 0, then saves the updated books list. Returns success or error message.

  @mcp.tool()
  def restock_book(book_id: int, quantity: int):
      """Add stock to a book."""
      if quantity <= 0:
          return {"success": False, "error": "Quantity must be > 0"}
  
      books = load_books()
      book = next((b for b in books if b["id"] == book_id), None)
  
      if not book:
          return {"success": False, "error": f"Book {book_id} not found"}
  
      book["count"] += quantity
  
      if save_books(books):
          return {
              "success": True,
              "message": f"Restocked {quantity} of '{book['title']}'",
          }
      else:
          return {"success": False, "error": "Save failed"}