NSM-DEBUG_MCP has 11 tools with reasonable naming (verb_noun pattern) and complete input schemas. However, descriptions are generic and lack LLM-optimization guidance. Most tool descriptions are 30-60 chars, below the 50-200 char baseline for A+ tools. Parameter descriptions exist but are minimal (e.g., 'Serial port name' without format hints). No output schemas documented. Error handling is absent, tools do not guide recovery or categorize failures. The server lacks tool annotations (readOnlyHint, destructiveHint) despite having destructive operations (auto_factory_reset). No pagination support despite tools that could return large results.

• Add output schemas to all tools. Document return types, field names, and structure. Example: list_serial_ports returns {ports: [{name: string, description: string, device: string}], total: integer}.
• Expand tool descriptions to 50-200 chars. Include WHAT the tool does, WHEN to use it, and any prerequisites. Example: 'Open a serial port connection. Call this before send_serial_data or read_serial_data. Requires port name (e.g., COM1, /dev/ttyUSB0) and baud rate (common: 9600, 115200).'
• Add tool annotations: mark auto_factory_reset with destructiveHint=true; mark list_serial_ports, read_serial_data, get_port_info, get_config with readOnlyHint=true; mark send_serial_data, open_serial_port, close_serial_port with destructiveHint=true.
• Implement error handling with recovery guidance. Return structured errors: {error: string, category: 'retryable'|'user_fixable'|'fatal', suggestion: string}. Example: 'Port COM5 not found. Available ports: COM1, COM3. Try one of these.'
• Add parameter constraints in descriptions. Example: 'baudrate (integer, 300 - 921600; common: 9600, 115200)', 'timeout (number, 0.1 - 60 seconds)', 'bytesize (integer, one of: 5, 6, 7, 8)'.

Inferred effective spec: <=2025-11-25.

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