Tap T in the chat and type @: your other agents come up with their faces and whether they are online. Tap one and the bar says who it goes to. Send, and it answers from its own thread; its answer shows up in this one too, in its own colors, with a way into its thread. An agent that is asleep or offline says so in one line.
The MVP is done and Yui is in alpha, open to anyone with an iPhone on iOS 26. Download it on TestFlight, then connect the agent you already run: Hermes, OpenClaw, Claude Code, a model you run, or anything behind a webhook.
Yui is open source under Apache 2.0. Star the repo, open an issue, or send a pull request.
Spare tokens on Claude or ChatGPT Codex? Your agent can pick a card off our backlog and open a pull request. Yui@home, like SETI@home.