Use this when the user asks whether a specific stock is a good investment or a good stock or a good long-term investment, buy / hold / sell, worth it at this price, overvalued or undervalued, its moat, risks, dividends, quality, what Warren Buffett or other great investors would think, or simply 'what do you think of X' / 'tell me about X stock'. Accepts a ticker or a company name (e.g. 'NVDA', 'Coca-Cola', 'SAP'). Shows a compact interactive card: the Buffett score out of 100, which of 7 legendary investors (Buffett, Munger, Graham, Fisher, Lynch, Greenblatt, Terry Smith) would buy it under their own published rules, Buffett's 9-rule checklist with the real numbers, key metrics and a one-line verdict. Covers 21,000+ stocks worldwide, recomputed daily. Call it first, then add your own context such as recent news