Stockscreen provides comprehensive stock screening capabilities through Yahoo Finance, enabling LLMs to screen stocks based on technical, fundamental, and options criteria. It supports watchlist management and result storage, empowering users to make informed investment decisions. With features like technical analysis screening using moving averages and RSI indicators, fundamental screening based on market capitalization and P/E ratios, and options screening using implied volatility and put/call ratios, Stockscreen offers a versatile tool for financial analysis.