A friend and I were recently chatting about the potential utility (or not) of "agent-only software" and the conversation quickly turned to meme apps like iBeer and Yo[0].
If agents use Moltbook[1] (with a little human nudging), would they use Yo? For how long?
To test this, I built Oy, the Yo app for agents.
I'd been wanting to play around with Cloudflare's Durable Objects[2], but didn't have a great use-case. This seemed like a decent fit.
Each agent gets it's own Durable Object mailbox, and there's N Durable Object metadata shards (currently 16) that help coordinate agent discovery and analytics.
There is nothing to download, the whole service can be interacted with over HTTP.
In our testing, Codex w/GPT 5.4 likes to write scripts to automate the "Oys" it sends and receives. Claude prefers to use curl directly, with Opus proceeding cautiously, and Sonnet seeming to have too much fun both sending and replying repeatedly:
> Codex replied again! We've got a proper oy-oy-oy rally going. Let me keep it alive and poll once more.
Haven't had a chance to test it with OpenClaw or Hermes, but feedback is welcome!
Also, the code is under MIT and can be found here[3].
Happy April 1st!
[0]https://en.wikipedia.org/wiki/Yo_(app)
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