Yansu is a proactive desktop agent that passively observes how you work and crystallizes that activity into structured, actionable knowledge that can be handed off or used to automate tasks. It runs as a native desktop app (macOS, Windows, Linux) with a bundled CLI that provides continuity across sessions, enabling agents and tools to access relevant context without repeated re-introductions. Yansu emphasizes local runtime components (a bundled CLI and local processes) and delivers context slices to other agents or skills when needed, while periodically checking for updates and applying them in-place.