This server has only 1 tool ('add') with significant definition gaps. The tool is visible and directly registered via server.tool() in src/index.ts. Schema exists (Zod validators for 'a' and 'b' parameters, both numbers) and is properly typed. However, the tool lacks a description entirely, there is no docstring or description argument passed to server.tool(). Both input parameters ('a' and 'b') lack descriptions; Zod provides type information only, not semantic meaning. The output schema is not documented. The tool name 'add' is adequate but generic (no action verb prefix like 'compute_sum'). This server represents a template/demo with minimal production quality.

• Add a description to the 'add' tool: server.tool('add', { a: z.number().describe('First number to add'), b: z.number().describe('Second number to add') }, async ({ a, b }) => ({ content: [{ type: 'text', text: `Sum: ${a + b}` }] }), 'Adds two numbers together and returns their sum.'), ensure the description is 10 - 200 characters and explains WHAT the tool does and WHEN to use it.
• Add descriptions to both parameters 'a' and 'b' using .describe() in the Zod schema: z.number().describe('The first operand in the addition') and z.number().describe('The second operand in the addition').
• Consider renaming the tool from 'add' to 'compute_sum' or 'add_numbers' to follow verb_noun convention and reduce ambiguity in multi-tool environments.
• Document the output schema in a JSDoc comment above the tool registration, e.g. '@returns {{content: [{type: string, text: string}]}} Returns the sum as a text response.' This helps LLMs understand what to expect.
• Add input validation and error handling: catch invalid inputs (e.g., NaN, null) and return a clear error message: 'Invalid input: both a and b must be finite numbers. Got a={a}, b={b}.' This enables the LLM to self-correct.