Connects Claude to 80,000+ APIs on South Korea's data.go.kr portal covering weather, real estate, business registration, air quality, and transit data. Three tools let you search APIs by keyword, inspect their parameters and response schemas, then call them with automatic serviceKey injection and XML-to-JSON normalization. Built in C# with lazy credential resolution that prompts for your data.go.kr API key on first use if you're on a supporting host. Includes SSRF protection via domain whitelist and EUC-KR encoding support for legacy government endpoints. You'll need to subscribe to individual APIs on data.go.kr before querying them, but discovery and schema inspection work immediately once you have a portal account.