The Luzia MCP server provides 8 well-named, read-only cryptocurrency tools with clear descriptions and proper JSON Schema inputs. Tool naming follows the verb_noun pattern (get_ticker, get_exchanges, etc.) consistently. All 8 tools have non-empty descriptions (average ~130 chars, within the 10-1024 baseline). All required parameters are described with helpful context (e.g., 'Exchange identifier (e.g., binance, coinbase)'). Schema definitions are complete with proper types and enums where applicable (e.g., interval enum in get_history, type enum in get_exchanges). However, several output schemas are not documented in the source, we can infer return types from context but cannot verify exact field names or nested structures. Error handling is present (via LuziaError imports) but error guidance text is not visible in the tool definitions. All tools are READ_ONLY, which is appropriate for a crypto pricing service. Tool composition is good: each tool has one clear responsibility. No security issues detected, no credentials exposed as parameters, all API authentication handled server-side via getLuziaClientForKey(). Logging is implemented via createLogger. The main gap is lack of visible output schema documentation and error message guidance patterns.

• Document output schema for each tool. Add a 'returns' block to each tool description or tool definition specifying: returned field names, types, required vs optional fields, and examples. E.g., 'Returns: { ticker: string, exchange: string, price: number, timestamp: number, ...}'.
• Add error handling guidance to tool descriptions. Document common failure modes and recovery paths: 'If exchange is invalid, call get_exchanges() first. If symbol is unknown, call get_markets(exchange) to see available pairs.'
• Implement offset/cursor pagination for get_tokens and get_exchanges. Add 'offset' (default 0) and/or 'cursor' parameters, return a 'total' count and 'next_cursor' in responses, and document in descriptions: 'Results paginated at 20 items per request.'
• Add dependency hints to get_ticker and get_tickers: 'Call get_exchanges() to list supported exchanges, or get_markets(exchange) to see available trading pairs on a specific exchange.'
• Consider batch variants: offer get_tickers (plural) as a more efficient alternative to looping get_ticker, which is already present. Ensure it's positioned as the preferred tool for multi-symbol queries.
• Add result limits to tool descriptions. E.g., 'Returns up to 50 tokens matching the search term. Use pagination to retrieve more.' This sets expectations and prevents context window exhaustion.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry