Single tool 'add' has critical definition gaps. Tool name lacks action verb (should be 'add_numbers' or similar for clarity). Description is minimal (13 chars, below 20-char threshold). Input parameters 'a' and 'b' have NO descriptions (null values visible in schema), violating the requirement that every parameter must have a description. No output schema documented. No error handling guidance. This server fails multiple hard scoring rules.

• Add descriptions to parameters 'a' and 'b': e.g., 'a: The first integer to add (range: -2147483648 to 2147483647)' and 'b: The second integer to add (range: -2147483648 to 2147483647)'.
• Expand tool description to 50-150 chars explaining purpose and when to use: 'Adds two integers and returns their sum. Use this for arithmetic calculations. Returns an integer result.'
• Document output schema: specify that the tool returns an integer (e.g., 'Returns: integer, the sum of a and b').
• Rename tool from 'add' to 'add_numbers' to follow verb_noun convention and improve LLM discoverability.
• Add error handling for invalid inputs: validate that a and b are integers within acceptable range; return clear error messages like 'Invalid input: a must be an integer between -2147483648 and 2147483647'.