The server exposes a single tool 'check_comment' with a clear verb-noun name and reasonable description. However, it has multiple critical deficiencies: (1) The tool description lacks context about WHEN to use it or WHAT it returns; (2) Parameter descriptions are generic and do not specify expected format or constraints; (3) No output schema is documented anywhere in the codebase; (4) The tool performs keyword matching ('buy', 'price') as hardcoded triggers with no explanation of why these specific keywords or how they generalize; (5) No error handling guidance is present, what happens if product_sku is invalid? Does the checkout URL fail silently?; (6) The implementation is visible in client.py but tool registration via MCP protocol is not shown, we cannot verify if this is actually exposed as an MCP tool or just a Python class.

• Document the output schema explicitly. Add a schema definition showing: {'type': 'object', 'properties': {'trigger_dm': {'type': 'boolean', 'description': 'Whether purchase intent was detected'}, 'checkout_url': {'type': 'string', 'description': 'URL to initiate checkout if trigger_dm is true, empty string otherwise'}}, 'required': ['trigger_dm', 'checkout_url']}.
• Expand parameter descriptions to 60+ chars each. For 'user_comment', write: 'The user\'s comment text to analyze for purchase intent. Should be a natural language string, typically 10-500 characters. Case-insensitive matching is applied.' For 'product_sku', write: 'The product SKU (stock keeping unit) to link in the checkout URL. Must be alphanumeric, typically 5-20 characters (e.g., SKU_789). Used to construct the checkout URI.'
• Explain trigger keywords and constraints. State: 'This tool detects purchase intent by checking for keywords "buy" or "price" (case-insensitive). Returns a checkout URL if trigger is detected; otherwise returns empty string. Note: keyword matching is basic and may not catch synonyms (e.g., "purchase", "cost", "payment").'
• Add error handling guidance to the description. Include: 'If product_sku is invalid or the checkout service is unreachable, the tool returns an empty checkout_url but trigger_dm may still be true. Validate SKU format before calling. Retry with delay if checkout service is temporarily unavailable.'
• Verify and document the MCP server registration. Provide explicit code showing how check_comment is registered as an MCP tool (e.g., server.define_tool(...) or decorator syntax). Include transport details (HTTP, STDIO, SSE).