Critical failures across all dimensions. The single tool 'execute_skill_action' has no visible input schema, no parameter descriptions, and a generic description that violates baseline standards. The mcp_server.py file contains only a stub that prints JSON and does not implement the MCP protocol. No tool registration, no schema validation, no error handling. This is a non-functional skeleton.

• Define a proper JSON Schema for execute_skill_action input. Specify all parameters (e.g., action_type, device_id, warranty_months) with types, descriptions, and constraints. Example: {"type": "object", "properties": {"action_type": {"type": "string", "enum": ["inspect", "grade", "warranty", "escrow"], "description": "The skill action to execute..."}, ...}, "required": ["action_type"]}
• Expand tool description to 50 - 200 characters. Example: 'Execute refurbished electronics grading, warranty coverage, and escrow shield actions. Supports inspect (device diagnostics), grade (cosmetic/functional assessment), warranty (coverage terms), and escrow (buyer protection). Returns device ID, grade, price, and warranty details.'
• Rename tool to a specific action verb. Instead of 'execute_skill_action', use separate tools: 'inspect_refurbished_device', 'grade_device_condition', 'calculate_warranty_terms', 'initiate_escrow_shield'. Each tool does one thing clearly.
• Document the output schema for each tool. Example for inspect_refurbished_device: {"type": "object", "properties": {"device_id": {"type": "string"}, "cosmetic_grade": {"type": "string", "enum": ["EXCELLENT_REFURBISHED", ...]}, "battery_health_percentage": {"type": "number", "minimum": 0, "maximum": 100}, ...}}
• Implement the MCP protocol in mcp_server.py. Use the official MCP SDK or implement request/response handling for STDIO. Parse incoming JSON-RPC messages, route to tool handlers, and return structured responses with proper error handling.