This server exhibits critical definition gaps across all four tools. All tools lack parameter descriptions entirely, the rubric requires every parameter to have a description explaining what it controls. Three of four tools have empty input schemas ({}), providing zero guidance on required fields or types. Descriptions are present but generic and lack actionable context for LLM selection. No output schemas are documented. The x402 payment pattern is novel but underdocumented in the tool interface itself. This server would not pass code review for production use.

• Add full input schemas to all tools. For get_catalog and get_signals, if truly no parameters are required, explicitly document this: 'Input: {} (no parameters required)'. For purchase_access, expand to {"tier": {"type": "string", "description": "The tier to purchase (e.g., 'mcp_signals')", "enum": ["mcp_signals", "...other tiers..."]}}. For check_payment, add descriptions to both parameters explaining format (e.g., 'tx_hash: blockchain transaction hash in hex format').
• Document output schemas for each tool. Example: get_catalog should return {"tiers": [{"name": string, "price_usd": number, "features": [string]}]}. purchase_access should return {"payment_reference_id": string, "wallet_address": string, "amount_crypto": number, "currency": string}. check_payment should return {"api_key": string, "expires_at": string}.
• Expand tool descriptions to 100-150 characters each, answering: What does it do? When should I call it? What do I get back? Example for get_signals: 'Fetch live trading signals for the authenticated user. Call after obtaining an API key via purchase_access and check_payment. Returns array of signal objects with timestamp, symbol, and recommendation.'
• Add error handling documentation. Document that get_signals returns a structured 'payment_required' error with a recovery hint: 'Call purchase_access(tier="mcp_signals") to initiate payment, then check_payment() once on-chain confirmation occurs.' This guides the LLM's recovery path.
• Add parameter constraints and enums. For purchase_access, enumerate valid tier values. For check_payment, specify tx_hash format (e.g., '0x-prefixed hex string, 66 characters'). For get_signals, document any optional filters (if any) in the schema.