Critical failures across all dimensions. The single tool 'execute_skill_action' has a minimal description (58 chars, below the 10-1024 baseline), lacks output schema documentation entirely, and the input schema is present but parameters lack descriptions. The mcp_server.py file shows only a stub that prints JSON and does not actually implement MCP protocol message handling. Tool definitions appear inferred from client.py rather than explicitly registered via proper MCP mechanisms. No error handling, no validation, no security considerations visible.

• Add a detailed output schema documenting all fields returned by execute_skill_action (escrow_shield_id, transaction_amount_gbp, buyer_funds_locked_in_escrow, courier_tracking_carrier, inspection_window_hours, seller_guaranteed_funds_release, zero_fraud_marketplace_protection_active) with types and descriptions.
• Add descriptions to all three input parameters. For 'item_category', specify valid enum values (designer_watch, rare_collectible_sneakers, etc.). For 'handover_type', document valid options (tracked_courier, etc.). For 'transaction_amount_gbp', specify the valid range (e.g., 0.01 - 100000).
• Expand the tool description to 100 - 200 characters. Explain: What does this tool do? When should the LLM call it? What does it return? Example: 'Protect a peer-to-peer transaction by locking buyer funds in escrow and arranging tracked delivery. Returns an escrow shield ID, inspection window, and release conditions. Use this when a buyer and seller agree on a transaction and need fraud protection.'
• Implement proper MCP protocol message handling in mcp_server.py. Replace the stub with a real server that: (1) reads JSON-RPC messages from stdin, (2) dispatches to tool handlers, (3) returns properly formatted MCP responses with tool results or errors.
• Add error handling and recovery guidance. Document what happens if the transaction amount is invalid, if the item category is unsupported, or if escrow setup fails. Return actionable error messages like 'Invalid item_category: got "unknown_item", must be one of: designer_watch, rare_collectible_sneakers, vintage_electronics'.