This HTTP stateful MCP server demonstrates good pattern adherence with clear naming, descriptions, and schemas. All three tools are properly registered with Zod schemas, descriptions, and input validation. However, output schema documentation is partial (only list_notes has an outputSchema), and error handling guidance is minimal. The server shows awareness of session state management and proper tool isolation, but lacks comprehensive error recovery messaging and some parameter constraints could be more explicit.

• Rename 'simulate_work' to 'stream_progress_logs' or 'emit_work_progress' to clarify that it emits logging output, not business work.
• Add outputSchema to add_note and simulate_work using Zod (z.object with text and optional structured fields). List_notes already does this correctly.
• Enhance error messages in tool handlers. E.g., if session.notes.push fails, return: 'Note storage failed: session may have expired. Try creating a new session.' instead of a generic error.
• Add tool annotations: mark add_note with {destructiveHint: true} (modifies session state), list_notes with {readOnlyHint: true}, and simulate_work with {idempotentHint: true} (repeatable logging without side effects).
• Clarify 'closeSseAfterStep' in simulate_work description: add 'Used to test stream resumability, closes the connection mid-operation to verify the client can reconnect and resume. Rarely needed in production.'
• Add explicit validation error messages. If steps < 1, return 'steps must be >= 1 (received: X)' instead of relying on Zod's default error serialization.

Inferred effective spec: 2025-06-18+.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry