QM

Building "QM", an open-source multiplayer agent harness. Made by Y Combinator.

[QM @qm__dev]

Deploy QM in 1-click on DigitalOcean. ⛵

Try it https://t.co/Feg96zVQLo

[DigitalOcean @digitalocean]

“DigitalOcean makes it easy to get started.” @ycombinator Labs’ Joshua France on the first one-click deployment for QM, YC’s open-source agent harness.

Check out QM on DigitalOcean today: https://t.co/BuSB6NqSd1. To learn more: https://t.co/fjA0yxRcbi.

[Y Combinator @ycombinator]

In collaboration with @olam_labs, we ran a series of experiments letting agent swarms compete in Minecraft and Mindustry.

We wanted to see what kinds of agent dynamics would emerge when they shared a world over long periods of time.

We found civil bureaucracy, thousands of telegraphic A2A messages, and OpenAI models retrieving the game's source code to beat Claude.

More on our findings below:

[QM @qm__dev]

You can now host QM on E2B.

Run QM, its agent computers, and the apps they build on E2B.

More details here: https://t.co/mFUKq40yKH

[E2B @e2b]

.@ycombinator open-sourced the agent harness it uses internally, @qm__dev. It gives everyone on your team their own agent in Slack, so every agent needs a computer to work in.

That computer can now be an E2B sandbox. Set "sandbox.backend": "e2b" and every person and channel gets an isolated sandbox from the qm-sandbox template, with the GitHub CLI, the AWS CLI, Claude Code and Codex preinstalled.

Ask QM to run your tests and open a PR, and it does the work in your sandbox without touching anyone else’s.

Run all of QM on E2B with e2b sandbox create qm, or point your existing deployment at it.

https://t.co/1URQdQb3Uy

[E2B @e2b]

.@ycombinator open-sourced the agent harness it uses internally, @qm__dev. It gives everyone on your team their own agent in Slack, so every agent needs a computer to work in.

That computer can now be an E2B sandbox. Set "sandbox.backend": "e2b" and every person and channel gets an isolated sandbox from the qm-sandbox template, with the GitHub CLI, the AWS CLI, Claude Code and Codex preinstalled.

Ask QM to run your tests and open a PR, and it does the work in your sandbox without touching anyone else’s.

Run all of QM on E2B with e2b sandbox create qm, or point your existing deployment at it.

https://t.co/1URQdQb3Uy

[QM @qm__dev]

QM v0.1.15 is out.

Better multiplayer memory
More control over goals
Easier app connections
Plus reliability updates and more.

[QM @qm__dev]

QM v0.1.14 is out.

Claude Sonnet 5.5 and GPT-6.1 support
Tighter credential approvals
Simpler app sharing controls
Live subagent activity in sessions
Plus faster sandboxes, reliability fixes, and more.

https://t.co/GY9oR9BUl5

[Charlie @charliee_]

Won 1st place solo at @ycombinator's Own Your Intelligence hackathon! 🏆

Built QM Motion to give coding agents a sense of time, so they can catch UI bugs that only show up in motion.

Here’s the demo 👇

[QM @qm__dev]

QM v0.1.12 is out.

Agent fleets in alpha
Easier Slack setup
Better app editing and publishing
Plus reliability fixes and more.

https://t.co/f6GOaxBsvt

[QM @qm__dev]

qm has a new look

[Y Combinator @ycombinator]

Harnesses often get dismissed as just scaffolding, just prompt engineering, and not real research. But that couldn't be farther from the truth. The same model weights that score 30% on ARC-AGI score 95% with a better harness.

So we gathered a group of researchers and founders working at the frontier to do a deep dive into the state of harnesses.

We cover how we got to this point, the case for making your harness as expressive as possible, and what YC learned building an agent for every employee in the company.

00:00 - @FrancoisChauba1: Why harnesses matter
04:27 - Building an auto-researcher by accident
07:13 - A five minute history of harnesses
13:56 - Self-improving harnesses
18:35 - @sethkarten: Prime Agent, a self-improving RLM harness
21:50 - Context as an L1, L2, L3 cache
24:51 - From Turing machine to von Neumann computer
28:33 - Messaging between agents
30:04 - ARC-AGI results
33:09 - Emulator Bench and GPU kernels
37:30 - @JonSaadFalcon: OpenJarvis, personal AI on personal devices
38:26 - How far behind are local models
39:21 - The five primitives of a personal AI stack
42:47 - Letting cloud models optimize your local stack
43:53 - 800x cheaper than the cloud
45:58 - @josh__france and @jbellregan: QM, YC's agent harness for work
47:29 - A history of YC's internal agents
49:24 - OpenClaw and a fleet of 50 agents
51:04 - Pulling the brain out of the sandbox
54:43 - Letting the agent choose its own sandbox and model
57:16 - The grind tool: budgets on goals
58:50 - Agents don't understand social context

[QM @qm__dev]

Ox Alpha (stealth model) Pelican Bench

"Generate an SVG of a pelican riding a bicycle"

[QM @qm__dev]

Run multiple sessions at the same time ⚡

Conversation multi-view in QM v0.1.5

[QM @qm__dev]

QM Release v0.1.5 is out 🚀
- Multi-pane sessions
- Restartable, configurable sandboxes
- ⌘K session search
- Custom model providers + MCP connectors
- Better Slack workflows
- Customizable bot identity

https://t.co/J6Mde1WatX

[QM @qm__dev]

We're going to be using this account to keep the community updated on QM, YC's open source agent harness for work. Follow for updates!

https://t.co/BXf7kcB8Ic