Y Combinator Open-Sources QM: An MIT-Licensed Multiplayer Agent Harness That Runs In Slack And The Web
Y Combinator open-sourced QM, the multiplayer agent harness running its entire internal ops—accounting, legal, engineering. MIT license. Runs in Slack. Works with any LLM.
Why it matters
A production-grade agent infrastructure that handles isolation, permissions, memory, and multi-model flexibility is now available to practitioners. This is a real deployment pattern—not a toy—released at scale with vendor neutrality baked in.
The key facts
6 to knowReleased July 31, 2026 under MIT license
Used internally across accounting, legal, events, and engineering at Y Combinator
Isolated workspaces per employee; scoped memory, files, keychain, permissions, crons per Slack room
Supports Pi, OpenCode, Codex, Claude Code on same headless core—vendor lock-in avoided
Deployable in Slack and web
Durable sandbox architecture
Go to the source
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Publisher excerpt: Y Combinator has open-sourced QM, the multiplayer agent harness it uses internally across accounting, legal, events, and engineering. Released July 31, 2026 under an MIT license, QM gives each employee an isolated workspace and each Slack room its own scoped memory, files, keychain view,…