The 'add' tool has a visible Zod schema with typed parameters but critical deficiencies across naming, description, and parameter documentation. The tool name 'add' is a generic math operation, not prefixed with an action verb (e.g., 'calculate_sum'). The tool definition in src/index.ts shows NO description string whatsoever, only schema registration. Both parameters 'a' and 'b' have Zod type constraints (z.number()) but the schema extraction shows descriptions as null, meaning parameter documentation is completely absent. The output is a simple text response without documented schema. This fails multiple hard scoring rules: no tool description (description score = 0), null parameter descriptions (critical deficiency), and a naming pattern misaligned with production tool conventions. The server provides zero guidance to an LLM on when to use this tool, what each parameter means, or what the output structure is beyond a raw text response.

• Add a tool description string to the tool registration: this.server.tool('add', { a: z.number(), b: z.number() }, async ({ a, b }) => { ... }) must include a description like 'Calculate the sum of two numbers. Returns the numeric result as text.' (60-150 characters).
• Add descriptions to Zod schema fields. Use z.number().describe('First number to add') for each parameter, or pass a second argument to tool() with a description map.
• Rename the tool to reflect its action more clearly: 'calculate_sum' or 'add_numbers' instead of just 'add'.
• Document the output schema in the tool description or as a separate schema field, e.g., 'Returns: { content: [{ type: "text", text: "<numeric result>" }] }'.
• Add input validation and clear error messages. If non-numeric inputs are passed, return a structured error like { content: [{ type: 'text', text: 'Error: both a and b must be numbers. Received a=' + typeof a + ', b=' + typeof b }] }.