Single tool 'calculate' has a basic schema with Zod validation but critical gaps in descriptions. Tool description is generic (11 words, 34 chars, below 50-char baseline). All three parameters (operation, a, b) lack descriptions entirely (0 chars each), violating the 100% A+ baseline. No output schema documented. No error handling guidance (e.g., division by zero). Parameter descriptions are required by pattern:tool-description and baseline data shows 100% of A+ tools have param annotations averaging 72 chars. This server provides none.

• Add descriptions to all parameters: operation ('The arithmetic operation to perform: add, subtract, multiply, or divide'), a ('First operand (number)'), b ('Second operand (number)'). Each should be 50-100 chars.
• Expand tool description to 100-150 chars: 'Performs basic arithmetic operations (add, subtract, multiply, divide) on two numbers. Returns the numeric result. Use for simple math calculations.'
• Document the output schema: 'Returns {content: [{type: "text", text: string}]} where text contains the result formatted as "Result: <number>".'
• Add error handling for division by zero: catch and return 'Error: Cannot divide by zero' instead of Infinity.
• Rename tool from 'calculate' to 'perform_calculation' or 'compute_math' to follow verb_noun convention and improve LLM intent inference.