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Y CombinatorJuly 31, 2026

QM

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Y Combinator Releases QM: An Open-Source Agent Harness With Isolated Sandboxes and Postgres Memory

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Y Combinator Releases QM: An Open-Source Agent Harness With Isolated Sandboxes and Postgres Memory

Y Combinator has open-sourced QM, a multiplayer agent harness designed to provide isolated and collaborative AI assistants for startups.

### TL;DR

qm is an open-source, multiplayer agent harness designed for startups to facilitate collaborative work in Slack and on the web. It provides isolated workspaces for individuals and shared rooms for teams, featuring scoped memory, files, permissions, and durable sandboxes.

Key Insights & Metrics

Pricing
Free
Cost structure
Version
0.1.4
Current release version
Hardware
Requires infrastructure for PostgreSQL and cloud hosting (e.g., Fly.io or AWS)
Compute requirements
Category
Open Source
Licensing model
Region
United States
Primary region

Key Features

  • Personal and shared scopes for isolated and collaborative work
  • Multi-platform support for Slack and web interfaces
  • Model-agnostic architecture supporting Pi, OpenCode, Codex, and Claude Code
  • Durable per-scope sandboxes where installed tools persist
  • Configurable security postures with mandatory command policy guardrails
  • Background automation via crons and watches

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