Wallie runs entirely on your machine, watches your screen, hears your system audio, and generates first-person live commentary driven by a character you describe in plain English. A deduplication engine tracks bigram and trigram similarity with phrase cooldowns so it doesn't say the same thing twice. A rolling summarizer compresses old context so the persona doesn't drift or go blank after an hour. The Live2D avatar layer connects to VTube Studio for lip sync and mood-reactive expressions. The ceiling appears when you need the stream to respond to chat in a coordinated, dynamic way — the tool's agentic loop is built around what it sees and hears, not a two-way conversation.