The server defines a single tool 'add' with minimal documentation. The tool has a basic Zod schema (a: number, b: number) but lacks descriptions for parameters, output structure documentation, and any error handling guidance. The tool name 'add' is a verb but is overly generic for a mathematical operation, 'add_numbers' would be clearer. Parameter descriptions are null/missing entirely, violating the critical requirement that every parameter must have a non-empty description. No output schema is documented. The implementation is simplistic (basic arithmetic) with no error handling, validation guidance, or recovery hints. This server fails multiple critical checks from the Definition Quality rubric.

• Add a tool description: 'Adds two numbers and returns their sum. Use this tool for basic arithmetic calculations. Returns the result as a text string.'
• Add parameter descriptions: a → 'First number to add (any valid number, positive, negative, or zero)', b → 'Second number to add (any valid number, positive, negative, or zero)'
• Document the output schema: Explicitly state that the tool returns {content: [{type: 'text', text: string}]} where text contains the numeric sum.
• Rename the tool from 'add' to 'add_numbers' for clarity and to follow verb_noun naming convention.
• Add numeric constraints if any: Document if there are limits on the magnitude or precision of inputs (e.g., 'Numbers must be within ±1e6 for reliable computation').
• Add error handling guidance: If inputs could be invalid, describe what happens and how to recover (e.g., 'Invalid input: both a and b must be valid numbers. Received: {actual values}').