The Options Chain tool is an MCP server designed to connect Claude Desktop with the Tradier Sandbox API, enabling AI assistants to access real-time (delayed by 15 minutes) options chain and historical price data. Users can query the tool using natural language to retrieve information for specific stocks and expiration dates, filter by call or put options, and focus on options within a specified percentage range of the current price. This tool automatically filters for significant strikes to limit context size, ensuring efficient data retrieval for informed decision-making and analysis.