qm: a multiplayer agent harness for work

Y Combinator’s software team has open-sourced qm, an agent platform for a whole company rather than one person, living in Slack and on the web. A headless TypeScript core with Postgres handles identity, dual-scoped memory and permissions (personal workspaces plus shared team projects), sandboxed tool execution, and crons for background automation. The harness itself is pluggable: Claude Code, Codex, OpenCode or Pi. MIT-licensed and designed to be forked privately rather than consumed as a product.

A production-scale data point for the ideas in anatomy of an agent harness and harness engineering.