My setup for working with AI coding agents used to be four terminal windows, three of which I'd forgotten what I asked. Then my machine rebooted for an update and all four were gone — not just the windows, the conversations.
So I built wmux. MIT, native on Windows and macOS.
What it is
tmux multiplexes a terminal. wmux multiplexes a whole workspace — terminals, agents, git worktrees, a browser, and the channels agents coordinate over — all owned by a daemon that survives quits, crashes, and full OS reboots.
Three things that changed my workflow
One prompt → N agents → merge the best. Fan one prompt out into up to 8 tasks, each in its own git worktree on a fresh branch with its own agent pane. Then review every task's diff side by side and adopt hunks as a single all-or-nothing git apply — your tree is fully changed or fully untouched, never half-applied. Close the task or open a PR in one click.
Agents coordinate, not just coexist. Agent-to-agent messaging and task delegation addressed by pane, plus Slack-style channels agents read, post, and get @-mentioned into (server-verified sender, durable inbox, survives reboot). An execute approval gate stops a remote agent from running code in your workspace without your OK — which is the only reason I'm comfortable letting agents delegate to each other at all.
It survives reboot with the conversation intact. A daemon owns every PTY. Reopen after a crash and sessions are still running, processes and all — recovered agent panes offer a one-click Resume back into the exact conversation. Declare panes in wmux.json and the daemon supervises them like an init system.
Zero-config MCP
Launch wmux and Claude Code just works — 84 tools register themselves, scoped to the calling workspace: browser_*, terminal_read/terminal_send, pane_*, channel_*, a2a_*. Or script the CLI:
wmux send "run the tests" --submit
wmux read-screen --tail 40
wmux channel post backend "tests green, merging"
There's also a built-in Chrome over CDP, so agents actually click, type, and screenshot — React inputs and CJK text included.
Try it
winget install openwong2kim.wmux
macOS (Apple Silicon): download the .dmg — signed, notarized, stapled. Linux builds are experimental.
Repo: github.com/openwong2kim/wmux · wmux.app
Two things I'd genuinely like input on: is 8 tasks too many diffs to read, and do channels or direct delegation win for most people? If you run more than two agents at once and it feels like herding, I want to hear where it breaks for you.
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