This server has severe definition quality issues. Tool 1 (execute_skill_action) has a generic description and no visible input schema in the source code. Tool 2 (broker_multi_merchant_cart) has a reasonable description and partial schema visible in the evaluation metadata, but the actual tool registration is not visible in mcp_server.py, only a hardcoded client class exists in client.py. The mcp_server.py file does not register tools via the MCP protocol; it merely prints a JSON status message. No tool definitions follow MCP registration patterns. Parameter descriptions are minimal or absent. Output schemas are not documented. Error handling is absent. The server appears to be a mock/stub implementation rather than a functional MCP server.

• Implement proper MCP server initialization and tool registration. Use the MCP SDK or protocol library to register tools with names, descriptions, input schemas, and output schemas. mcp_server.py should handle MCP requests, not print a static status.
• Add a detailed description to execute_skill_action explaining what skill actions are supported, when to call it, and what it returns. Currently it is too vague for LLM selection.
• Define a complete input schema for execute_skill_action with parameter types, descriptions, and constraints. Specify what 'skill action' means (enum of valid actions, or a free-form string with validation rules).
• Document the output schema for broker_multi_merchant_cart. Declare the structure of federated_cart_id, merchants_involved_count, items_subtotal_usd, consolidated_shipping_usd, universal_checkout_session_url, and agent_handoff_token with types and descriptions.
• Add error handling and recovery guidance. Return structured error responses that tell the LLM what went wrong (e.g., 'Invalid merchant_domain: must be a valid domain name') and what to do next (e.g., 'Retry with a valid domain or call list_merchants() to see available options').