QM is an open-source multiplayer AI agent harness designed for startups, giving each employee their own isolated workspace with scoped memory, files, credentials, crons, and sandboxes. It integrates with Slack and a web UI, supports multiple AI coding harnesses (Claude Code, OpenCode, Codex, Pi), and allows collaborative agent use in channels and projects. The architecture uses a headless TypeScript/Node core with Fastify, Postgres for persistence, per-scope durable sandboxes, and a plugin system for Slack and web surfaces. Security postures range from strict (human approval per tool call) to auto (content screening) to dangerous. Organizations deploy it to their own cloud via a deployment repository pattern, with support for private forks and org-level customization.
