Single tool 'add' has a clear, concise description and properly typed input parameters with descriptions, but lacks critical elements for production MCP use: no output schema documentation, no error handling guidance, minimal description depth, and no composition hints. The tool is simple arithmetic (verb + noun naming is correct), but provides no actionable recovery information if something fails. Input schema is present and complete with descriptions for both parameters, meeting baseline requirements for a minimal tool. However, the description lacks depth on when to use this tool, any prerequisites, or what happens on error.

• Expand the tool description from 22 to 80-150 characters. Example: 'Add two integers and return their sum. Use for mathematical calculations in workflows. Returns an error if overflow occurs. Idempotent, safe to retry.'
• Add an output schema definition to the mcp.Tool registration documenting the structure: {type: 'object', properties: {result: {type: 'integer', description: 'Sum of the two input integers'}}}.
• Document error conditions and recovery paths in the description. Example: 'On overflow, returns an error. If overflow occurs, consider breaking the calculation into smaller steps or using a different tool.'
• Add parameter constraints to the description if there are limits on input magnitude. Example: 'a: First integer (range: -2^31 to 2^31-1)' and 'b: Second integer (range: -2^31 to 2^31-1)' to set LLM expectations.
• If this is a template/starter repo, add a second example tool (e.g., subtract, multiply) to demonstrate tool composition and tool-chaining patterns with shared output fields.
• Consider adding a 'readOnlyHint: true' annotation to the tool to signal to the MCP client that this is a safe, non-destructive operation.