Critical failures across all dimensions. The single tool 'execute_skill_action' has a minimal description (31 chars, below 20-char hard floor), no visible input schema validation in the MCP server code, and the tool is never actually registered or invoked in mcp_server.py. The server prints a static JSON response claiming support for the tool but contains no tool definition, no schema, no error handling, and no actual implementation. The client.py file exists separately but is never integrated into the MCP server. This is a non-functional MCP implementation.

• Implement actual tool registration in mcp_server.py using the MCP protocol. Define the tool with name, description (150-250 chars explaining WHAT it does, WHEN to use it, and what it returns), and a complete JSON Schema for inputs with type, description, and constraints for each parameter.
• Expand tool description from 31 to ~150 chars: 'Execute a sidewalk robot delivery mission. Dispatches an autonomous robot to deliver a payload to a merchant address, returning mission ID, transit time, carbon savings, and secure handover code. Use when a customer requests last-mile delivery.'
• Add JSON Schema validation for all parameters: merchant_address (string, required, pattern for valid address format), delivery_distance_km (number, required, min 0.1, max 50), payload_kg (number, required, min 0.5, max 25). Include these constraints in parameter descriptions.
• Integrate client.py into mcp_server.py. Implement a proper MCP tool handler that accepts tool calls, invokes SidewalkRobotLastMileZeroEmissionDeliveryClient.dispatch_sidewalk_delivery_bot(), and returns structured results with all fields (bot_mission_id, assigned_robot_id, transit_duration_minutes, carbon_emissions_saved_vs_car_pct, merchant_delivery_cost_reduction_pct, lockbox_otp_secure_handover_code).
• Add error handling with recovery guidance. Catch invalid addresses (return 'Invalid address format. Expected: street, city, state'), out-of-range distances (return 'Distance must be 0.1 - 50 km'), and payload violations (return 'Payload must be 0.5 - 25 kg'). Include actionable next steps for the LLM.