Single tool with basic schema and minimal description. Tool name 'get-stock-prices' follows verb_noun convention (+). Input schema present with type and description (+). However, description is only 87 chars and lacks context on when/why to use it, expected output format, or error recovery guidance. No output schema documented. Error handling returns generic messages without recovery hints. No parameter constraints (e.g., valid symbol formats). Missing idempotency guarantees and rate-limit guidance for external API dependency.

• Add output schema documentation: 'Returns object with fields: symbol (string), open (float), high (float), low (float), price (float), change (float), change_percent (string). Example: {symbol: "AAPL", price: 150.25, change: 2.5, change_percent: "+1.69%"}'
• Expand tool description to 150-200 chars: 'Retrieves current stock price data (open, high, low, close, change) for a given stock ticker symbol. Use this to get real-time market data. Requires valid uppercase ticker (e.g., AAPL, MSFT). Rate limited to 5 calls/min.'
• Replace generic error messages with actionable guidance: 'Invalid symbol "xyz". Stock symbols must be 1-5 uppercase letters (e.g., AAPL, MSFT). If unsure, try a common ticker like AAPL or GOOGL.'
• Add parameter constraint to StockSymbol description: 'Uppercase stock ticker symbol (1-5 characters, e.g., AAPL, MSFT, GOOGL). Invalid symbols return an error.'
• Document rate-limit behavior in tool description: 'Note: Alpha Vantage API allows 5 calls per minute on free tier. Repeated calls within 60 seconds may fail. Implement delays between requests.'