cmuxcmux
/docs
Changelog

#cmux 0.64.21: Simulator Panes, Mosh Transport, Idle CPU Reclaimed

Native Simulator Panes. Run iPhone and iPad Simulators as first-class cmux panes, rendered crisply at real size, with their own commands and automation so an agent can drive the simulator next to the terminal that built it.

Mosh for Remote Workspaces. Remote workspaces can use Mosh instead of plain SSH, so a laptop that sleeps, changes networks, or loses Wi-Fi picks the session back up instead of dropping it.

Idle CPU and Memory Reclaimed. Leaked openThread loops that burned about 90% of cmux idle CPU are gone, hidden Ghostty renderers release their memory, workspace switching no longer freezes the renderer, and idle background agents hibernate under critical memory pressure.

Navigation and Restore. Cmd+Shift+T reopens the last closed item, Cmd+[ and Cmd+] walk global workspace focus history, surfaces move between panes with automatic directional splits, and Dock panes, workspace IDs, and per-tab terminal zoom all survive a restart.

cmux on iPhone (beta). Stream Mac browser panes to the phone interactively, follow a chronological notification feed, launch agent workspaces from the task composer, and scroll terminals locally on screen-anchored render grids over a rebuilt peer-to-peer transport.

Added
  • Native iPhone and iPad Simulator panes, with their own commands and automation (#7857)
  • First-class Mosh transport for remote workspaces (#8442)
  • Workspace-wide terminal font zoom on Cmd+Ctrl+= / Cmd+Ctrl+- / Cmd+Ctrl+0 (#8791), and per-tab zoom now persists across restarts (#8543)
  • Cmd+Shift+T reopens the last closed item (#9132)
  • Cmd+[ and Cmd+] traverse global workspace focus history, and pane cycling becomes rebindable (#9329) -- thanks @azooz2003-bit! -- alongside a workspace-only focus history setting (#8654)
  • Move active surfaces between panes with automatic directional splits (#8764); goto_split:previous and goto_split:next cycle through every pane with wrapping (#2639) -- thanks @mykmelez!
  • Dock panes persist across session restore (#8690), with full Dock surface runtime parity (#8782)
  • Reopen closed workspaces with sticky repo identity (#8841)
  • Target browser profiles from the CLI (#8874), and Command-clicked HTML files render in browser panes (#9096)
  • Sidebar account and mobile pairing controls (#8354); sidebar metadata renders Markdown links (#8663) -- thanks @djova!
  • Notification feed read state is a leading swipe with mark-unread (#8868) -- thanks @azooz2003-bit!
  • Idle background agents hibernate under critical memory pressure even when routine Agent Hibernation is off (#9090)
  • cmux restore runs without a shell (#9265)
  • iOS (beta): stream Mac browser panes to the phone, interactive and pixel-perfect, with dialogs mirrored (#8298) -- thanks @azooz2003-bit!
  • iOS (beta): chronological notification feed (#8210) -- thanks @azooz2003-bit!
  • iOS (beta): launch agent workspaces straight from the task composer (#7670)
  • iOS (beta): Tailscale connection method opt-in with QR-authorized pairing (#9247) -- thanks @azooz2003-bit!
  • iOS (beta): haptic feedback setting (#8797), Open Folders on Tap (#8524), unified animated toasts (#8376), and workspace identity customization (#8636) -- thanks @azooz2003-bit!
Changed
  • Workspace initial commands launch through your login shell (#8801) -- thanks @azooz2003-bit! -- and auto-resume uses the normal terminal shell (#8837)
  • iOS (beta): the phone-to-Mac transport is rebuilt on one connectivity authority, with authenticated discovery, named disconnect reasons, and relay-credential rollover (#9284, #8840, #8716, #8494) -- thanks @azooz2003-bit!
  • iOS (beta): terminal scrolling is local and smooth on screen-anchored render grids (#8860) -- thanks @azooz2003-bit!
  • iOS (beta): state sync v2 replaces the invalidate-and-refetch loop with per-record deltas (#8284) -- thanks @azooz2003-bit!
  • iOS (beta): onboarding is rebuilt around a live agent handoff (#8418), as a swipeable tour (#9158) with a Game of Life backdrop on every page (#8880) -- thanks @azooz2003-bit!
  • iOS (beta): removing a Mac from a phone hides it for that phone only, instead of deleting it everywhere (#8760, #8778) -- thanks @azooz2003-bit!
Fixed
  • Fix leaked openThread loops burning ~90% of cmux idle CPU (#8851)
  • Fix workspace-switch renderer freezes (#8793), reclaim hidden Ghostty renderer memory (#8998), and fix the Vault sidebar beachball at large session counts (#8680)
  • Fix Vim Mode cursor and selection rendering (#8995)
  • Fix TextBox IME composition rendering (#8688)
  • Fix zsh prompt wrap spacer lines by letting Ghostty own prompt layout (#8964)
  • Fix Settings and main window zombies under AeroSpace (#8513) -- thanks @fml09!
  • Fix a Debug-build crash on macOS 26.5 from non-finite sidebar divider coordinates (#9156) -- thanks @oscarbrey!
  • Fix Mermaid diagrams double-scaling under viewer zoom (#8914), restore the focused-read indicator after a surface-scoped mark-read (#8927), keep Pi launch arguments when resuming a restored session (#8912), and import appearance at Settings store init instead of live-applying it (#8913) -- thanks @ejc3!
  • Notify only after the Pi agent settles (#8574) -- thanks @mrohan-sq!
  • Tear down remote daemon PTY sessions once (#8643) -- thanks @ejc3! -- and support respawn-pane in the Go relay tmux compatibility layer (#8660) -- thanks @bencollins2!
  • Exclude .attrib from watched filesystem events (#8659) -- thanks @varomorf!
  • Preserve surface IDs in workstream events (#8703) -- thanks @revanthreddy-hai!
  • Stop the sidebar PR poller from re-downloading every repo's full PR list on each poll (#8521) -- thanks @joshfree!
  • Restore Codex (#9370), Kimi Code (#8584), Grok (#9382), and Pi (#9399) sessions across relaunch, and stop duplicate agent resumes (#8619)
  • ssh-tmux: fix focus after single-pane promotion (#9020), named-key encoding for the remote TERM (#9273), and terminal replies leaking into reattached panes (#9272); fix workspace shortcuts from hosted tmux terminals (#8621)
  • Fix SSH relay deadlock after app restart (#9105), stale SSH workspace connection status (#9085), remote PTY PATH inherited from cmuxd (#8677), and login-shell resolution before terminal spawn (#8681)
  • Fix sidebar reopen cutoff render (#8626), row clipping during height-changing reorder (#9189), idle layout livelock (#8532), and status URL clicks (#8528)
  • Fix Dock paste routing to the selected terminal (#9112), Dock terminal working-directory inheritance (#8691), and Cmd-click link opening in Dock terminals (#8594)
  • Browser: fix navigation for terminal-wrapped URL pastes (#8601), automation recovery after load failures (#8548), partial blank screenshots (#9281), and blurred Google Sheets canvas rendering (#8697)
  • Fix inline code escaping in the Markdown viewer (#9274) and composer attachment thumbnail re-rasterization (#8817)
  • Fix renderer presentation for background-created surfaces (#8540) and stale semantic prompts duplicating inline TUI frames (#9275)
  • Fix workspace group anchor numbering (#9176); closing a group's anchor keeps the group instead of scattering its members to the root (#8925)
  • Preserve workspace IDs across session restore (#8695) and restored resume workspace titles (#8687); fit same-display restored windows to visible bounds (#8675)
  • Fix a DispatchWorkItem chain stack overflow (#8615) and subprocess pipe descriptor leaks (#9187)
  • iOS (beta): preserve terminal input ordering under fast typing (#8682), scroll position across mid-stream verified replays (#9032), and keyboard focus after the photo picker (#9287) -- thanks @azooz2003-bit!
  • iOS (beta): fix a startup crash from sentry-init racing environ mutation (#9238) and TestFlight crash paths (#9034)
  • iOS (beta): fix workspace-list scroll stutter from live updates (#9139), and make the notification feed scroll fast with thousands of items (#9141) -- thanks @azooz2003-bit!