Single tool with minimal definition quality. Tool name 'get_current_price' follows verb_noun convention (+), but description is only 16 characters in English ('获取股票的当前价格' = 'Get stock current price'), falling below the 20-char minimum threshold. Input schema is present with proper JSON Schema structure and type definitions, but parameter description '股票代码' (stock code) is generic and lacks format/constraint guidance. No output schema documented. No error handling guidance provided, the tool returns raw exception strings on failure, offering no recovery path. Tool is READ_ONLY (safe), but lacks idempotent/destructive annotations. No pagination, batching, or composition support.

• Expand tool description to 50-150 chars: 'Fetch the current stock price for a given ticker symbol. Returns the latest closing price. Supports US stocks (AAPL), Hong Kong stocks (0700.HK), and crypto (BTC-USD).'
• Document output schema: return type should be object with fields {price: string, currency: string, timestamp: string, symbol: string} instead of raw string.
• Add symbol parameter constraints: 'Stock ticker symbol (e.g., AAPL, 0700.HK, BTC-USD). 1-10 characters, alphanumeric + hyphen.'
• Implement error categorization: return structured errors like {error: 'invalid_symbol', message: 'Symbol INVALID not found. Try AAPL, MSFT, or search Yahoo Finance.', retryable: false} instead of raw exception strings.
• Add tool annotations to server.py list_tools(): include readOnlyHint=true in types.Tool() to signal safety to LLM.