This MCP server exhibits significant gaps in tool definition quality. While tool names follow action-verb conventions (ticker_info, news_vs_price, summarize_news), descriptions are present but generic. Input schemas are visible and properly typed, but output schemas are entirely absent from the code. The server lacks proper error handling patterns, parameter descriptions are minimal, and there is no evidence of idempotence handling or pagination support. Tools operate on a narrow domain (stock ticker data) with no composition patterns evident. The definitions are functional but fall short of production baseline expectations.

• Document output schema for each tool. Example for ticker_info: 'Returns {ticker: string, current_price: number, change_percent: number, date: ISO8601_string, summary: string}'. This enables LLM composition.
• Expand parameter descriptions to include constraints. E.g., 'days: Number of trading days to look back (1 - 365, default 30). If >90, may be slow due to API limits.'
• Add WHEN guidance to tool descriptions. Example: 'Call this to fetch the latest price and trend for a single ticker. For price vs. news correlation, use news_vs_price instead.'
• Implement and document error handling. In run_tool(), catch API failures and return structured errors like {error: 'ticker_not_found', ticker: 'XYZ', suggestion: 'Did you mean XYZW?'}. Update tool descriptions to mention recovery steps.
• Add a 'limit' parameter to news_vs_price with default 20 and max 100. Update description: 'Returns up to N rows of news→price mapping (default 20, max 100). Use pagination for larger datasets.'
• Implement caching for summarize_news results keyed by headline hash to ensure idempotence and reduce LLM API calls on retries.
• Rename 'days' parameter to 'lookback_days' or add a description suffix: 'days (count, not date). Example: days=30 means last 30 trading days, not December 30th.'
• Add tool annotations (readOnlyHint, idempotentHint) if fastmcp supports them, to help clients optimize tool selection and retry logic.

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

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