This MCP server exhibits significant quality gaps across naming, descriptions, parameters, and schemas. The server defines 8 tools but has 3 exact duplicates (calculator appears twice as tools #1 and #4; get_stock_price appears 3 times as tools #2, #5, #8; search appears twice as tools #3 and #7), indicating poor tool inventory management. Descriptions are present but generic and often include problematic example values (e.g., 'AAPL', 'TSLA' in get_stock_price). Parameter descriptions are minimal (1-3 words in many cases). Input schemas exist with types but lack critical constraints like enums for operation values in calculator or symbol validation in get_stock_price. No output schemas are documented. Error handling is minimal, tools return dicts with 'error' keys but provide no recovery guidance. The calculator tool accepts any operation string and returns an error, rather than constraining to enum values. get_stock_price exposes an API key in the source code (C9PE94QUEW9VWGFM), a critical security violation. rag_tool includes vague 'optional' thread_id parameter with no explanation of when it's required.

• Remove duplicate tool registrations. Consolidate calculator, get_stock_price, and search so each unique tool is registered once. Current 8-tool list with 4 duplicates wastes token budget and confuses agent routing.
• Move Alpha Vantage API key to environment variable or secrets manager. Use os.getenv('ALPHA_VANTAGE_KEY') instead of hardcoding. This prevents key leakage in version control and agent logs.
• Add enum constraint to calculator 'operation' parameter: enum=['add', 'sub', 'mul', 'div']. Update schema from string to constrained string. Add parameter description: 'Arithmetic operation: one of add, sub, mul, or div.'
• Remove example symbols from get_stock_price description. Instead, add a parameter constraint note: 'Symbol must be a valid stock ticker (e.g. 2-5 uppercase letters). Invalid symbols return an error from Alpha Vantage.'
• Document output schemas for all tools. Example for calculator: 'Returns {first_num: float, second_num: float, operation: string, result: float} on success, or {error: string} on failure.' Do the same for get_stock_price, search, and rag_tool.
• Expand search tool description to ~100 characters. Example: 'Search the web using DuckDuckGo. Returns a list of URLs and snippets. Use this to find general information; for stock prices, use get_stock_price instead.'
• Clarify rag_tool thread_id parameter. Update description: 'Thread ID for the chat session. When provided, RAG search is scoped to this conversation. When omitted, searches all uploaded documents. Required for multi-user deployments.'