Single tool 'add' has a valid schema with typed parameters (int, int) but critical gaps prevent higher scoring. Description is minimal (14 chars, below 20-char threshold). Both parameters lack descriptions entirely (null values visible in schema). No output schema documented. No error handling guidance. Tool does one thing (addition) but lacks the LLM-optimized documentation required for production use. Naming is acceptable but insufficient to overcome missing parameter documentation.

• Expand tool description to 50 - 150 characters explaining purpose, when to use, and what it returns. Example: 'Add two integers and return their sum. Use for arithmetic operations. Returns an integer result.'
• Add descriptions to both parameters. Example: a='First integer to add (any value)', b='Second integer to add (any value)'.
• Document the output schema explicitly. Example: 'Returns: integer (the sum of a and b)'.
• Add input validation with clear error messages. Example: 'Invalid input: a and b must be integers. Got a={type(a).__name__}, b={type(b).__name__}.'
• Consider adding optional min/max bounds if there are practical limits (e.g., to prevent overflow). Document in parameter descriptions.