The server provides 13 well-named tools with consistent verb_noun structure (get_price, get_vwap, get_sentiment, etc.). All tools have descriptions present. However, descriptions vary significantly in quality and completeness. Input schemas are consistently present with typed parameters and descriptions, but output schemas are entirely absent from the source code, a critical gap for LLM planning and data extraction. Error handling is minimal; the server catches HTTP 402 (payment required) but provides no recovery guidance or error classification. No tool annotations (readOnlyHint, destructiveHint) are visible. The server's instructions are detailed and helpful for agents, explaining the oracle's domain well, but individual tool descriptions lack depth about return structures and when to prefer one tool over another (e.g., get_price vs get_price_preview trade-offs).

• Add formal JSON Schema enum constraints to all parameters that have fixed valid values (e.g., base: {enum: ['btc', 'eth', 'sol', 'xrp', 'ada', 'doge', 'xau', 'eur', 'gbp', 'usd', 'chf', 'cny', 'cad', 'usdt', 'usdc']}) instead of relying on inline enumeration in descriptions.
• Document complete output schemas for every tool. Specify whether response includes: timestamp, signature (for signed endpoints), per-component breakdown (for indices), confidence/source metadata, and any error/warning fields.
• Add tool annotation hints to clarify read-only status. Register each tool with 'readOnlyHint: true' (or equivalent in your MCP framework) so LLMs and auditors know these calls have no side effects.
• Implement error recovery guidance. For HTTP 402 payment errors, return a structured error response including: expected cost, current account balance (if available), payment instructions (URL, method, token), and suggested next steps (retry after payment, use preview endpoint, contact support).
• Enhance parameter descriptions for pair-restricted tools. E.g., get_vwap: 'Asset quote (quote currency; available pairs: btc/usd, btc/eur, eth/usd, eth/eur, other pairs will return 400 error)'.
• Document output field semantics. For get_price: clarify if response includes {price: number, currency: string, timestamp: ISO8601, signature: string, pubkey: string, sources: [string], ...}. For get_volatility: specify if individual component values (realized_vol, implied_vol, etc.) are returned.
• Add deprecation or trade-off guidance. Explain when to use get_price (current) vs get_price_preview (free but stale up to 5 min); when to use specific indices (volatility/sentiment per-pair) vs stress/contagion (market-wide).