Single tool 'add' with critical definition gaps. Tool description is missing entirely (null in source). No output schema documented. No error handling guidance. Naming is generic ('add') without context of what domain this serves. This server fails baseline quality checks for production use.

• Add a tool description (50 - 200 chars): 'Add two numbers together and return the sum. Use this for basic arithmetic operations.' This tells LLMs when and why to call it.
• Add parameter descriptions: a: 'The first number to add (any real number)', b: 'The second number to add (any real number)'.
• Document the output schema: 'Returns an object with a single field: result (number), the sum of a and b.'
• Rename tool to reflect domain context, e.g., 'calculate_sum' or 'add_numbers' if this is a math service, or 'add_item_to_list' if it's a data operation.
• Add error handling: document what happens if inputs are invalid (non-numeric), and return actionable error messages like 'Invalid input: a must be a number, got string.'.