Single tool 'add' has a clear verb-noun name and basic description, but critical gaps undermine quality. The description is only 34 characters (below the 50-char minimum for clarity) and lacks context on when/why to use it. Input schema is present with proper types (integer) and descriptions for both parameters, meeting baseline requirements. However, the tool returns a StreamingResponse object without documenting the output schema, LLMs cannot predict what fields or structure to expect. No error handling guidance, no parameter constraints (min/max for integers), and no indication of idempotency or side effects. The tool appears to perform a trivial computation but streams it unnecessarily, raising questions about real-world applicability. Overall, this reads as a demo/proof-of-concept rather than a production-ready tool.

• Expand tool description to 100-150 characters explaining: 'Adds two integers and returns the sum. Use for basic arithmetic operations. Returns a JSON object with fields: result (integer), duration_ms (integer).'
• Document output schema explicitly: define what fields the streamed response contains and their types. If streaming events, clarify the event format and final result structure.
• Add parameter constraints: specify min/max for 'a' and 'b' (e.g., -1000000 to 1000000) in both the schema and description.
• Implement input validation with actionable error messages: 'Invalid input: a and b must be integers between -1000000 and 1000000. Got a={a}, b={b}.'
• Clarify streaming behavior: if SSE is intentional, document why streaming is needed for a simple addition (latency, progress reporting?). If not, return a simple JSON response {result: number} for better MCP compatibility.