# cmux 0.64.14: iPhone Companion App (Beta), Cross-Window Workspace Drag, Out-of-Process Custom Sidebars [ Changelog](https://cmux.com/docs/changelog) June 6, 2026 ### iPhone Companion App (Beta) Pair an iPhone with your Mac from the new Mobile Connect window and attach to your terminals from your phone, with opt-in forwarding of terminal notifications. The iOS beta ships on TestFlight as cmux BETA. ### Cross-Window Workspace Drag Drag a workspace out of one window's sidebar and drop it into another window's sidebar to move it, including grouped workspaces. ### Out-of-Process Custom Sidebars Custom sidebar extensions now run in their own process with an isolated interpreter, so a broken sidebar can't hang or crash cmux, and the interpreter covers a broader set of SwiftUI primitives. ### Browser Polish The omnibar selects the whole URL on the first focusing click (Chrome parity), browser chrome scales with the tab bar font size, a typing beachball with large histories is fixed, and hidden panes no longer stop actively-playing audio or video. ### Agent Session Fixes Claude resume keeps cmux hooks attached so notifications and status tracking survive resumes, Agent Hibernation works for node-backed Claude sessions, and Codex resume preserves CODEX\_HOME and pane order. Added - iPhone companion app (beta): pair an iPhone from the new Mobile Connect window (also in the command palette) and attach to your Mac's terminals from your phone, with a configurable pairing port and opt-in forwarding of terminal notifications; the iOS beta ships on TestFlight as cmux BETA ([#5079](https://github.com/manaflow-ai/cmux/pull/5079), [#5493](https://github.com/manaflow-ai/cmux/pull/5493), [#5489](https://github.com/manaflow-ai/cmux/pull/5489), [#5518](https://github.com/manaflow-ai/cmux/pull/5518)) - Drag a workspace into another window's sidebar to move it between windows, including grouped workspaces ([#5399](https://github.com/manaflow-ai/cmux/pull/5399)) - Sign In and Sign Out commands in the command palette ([#5529](https://github.com/manaflow-ai/cmux/pull/5529)) - OMP agent hook integration with notifications and session restore via `cmux hooks omp` ([#5413](https://github.com/manaflow-ai/cmux/pull/5413)) -- thanks @joshrzemien! Changed - Custom sidebar extensions now run out-of-process with an isolated interpreter, so a broken sidebar can't hang or crash the app ([#5294](https://github.com/manaflow-ai/cmux/pull/5294), [#5382](https://github.com/manaflow-ai/cmux/pull/5382)) -- thanks @azooz2003-bit! - Broader SwiftUI primitive coverage in the custom sidebar interpreter ([#5275](https://github.com/manaflow-ai/cmux/pull/5275)) -- thanks @azooz2003-bit! - Browser omnibar: the first click that focuses the address bar selects the whole URL, later clicks place the caret (Chrome parity) ([#5462](https://github.com/manaflow-ai/cmux/pull/5462), [#5352](https://github.com/manaflow-ai/cmux/pull/5352)) - Browser chrome (omnibar font and toolbar icons) scales with the tab bar font size ([#5464](https://github.com/manaflow-ai/cmux/pull/5464)) - Sidebar workspace group headers scale with the sidebar font size ([#5401](https://github.com/manaflow-ai/cmux/pull/5401)) - Agent Hibernation defaults to a 5-second idle window when enabled ([#5449](https://github.com/manaflow-ai/cmux/pull/5449)) - Tighter fuzzy filtering for skill suggestions in the terminal textbox ([#5348](https://github.com/manaflow-ai/cmux/pull/5348)) Fixed - Keep actively-playing audio and video in browser panes alive when the pane is hidden ([#5412](https://github.com/manaflow-ai/cmux/pull/5412), [#5441](https://github.com/manaflow-ai/cmux/pull/5441)) - Fix a typing beachball in the browser omnibar with large browsing histories ([#5397](https://github.com/manaflow-ai/cmux/pull/5397)) - Fix the main window refusing to resize narrower than its current width ([#5474](https://github.com/manaflow-ai/cmux/pull/5474)) - Fix the sidebar close button hidden under wrapped workspace titles ([#5488](https://github.com/manaflow-ai/cmux/pull/5488)) - Fix notification sound selection so the picker previews the selected sound and notifications play it ([#5480](https://github.com/manaflow-ai/cmux/pull/5480)) - Restore the menu bar icon dropdown menu on click ([#5451](https://github.com/manaflow-ai/cmux/pull/5451)) - Fix OSC control sequences (e.g. terminal background color) printed as literal text when sent via `cmux send` ([#5509](https://github.com/manaflow-ai/cmux/pull/5509)) - Fix native Claude resume dropping cmux hooks, so notifications and status tracking keep working on resumed sessions ([#5430](https://github.com/manaflow-ai/cmux/pull/5430)) - Fix Agent Hibernation for node-backed Claude sessions ([#5433](https://github.com/manaflow-ai/cmux/pull/5433)) - Codex resume hardening: keep restored surfaces from jumbling and preserve `CODEX_HOME` so non-default Codex homes resume correctly ([#5351](https://github.com/manaflow-ai/cmux/pull/5351)) - Fix Cmd +/- zoom in the browser and Markdown viewer on non-US keyboard layouts ([#5394](https://github.com/manaflow-ai/cmux/pull/5394)) - Preserve syntax highlighting on changed lines in the diff viewer ([#5415](https://github.com/manaflow-ai/cmux/pull/5415)) - Fix a stale group name in the window title bar after renaming a workspace group ([#5408](https://github.com/manaflow-ai/cmux/pull/5408)) - Fix the Dock sidebar not rendering after closing and reopening it ([#5437](https://github.com/manaflow-ai/cmux/pull/5437)) - Fix OMO subagent pane respawn through the tmux compatibility shim ([#5465](https://github.com/manaflow-ai/cmux/pull/5465)) -- thanks @leodiegoo for the report! - Reduce sidebar git activity by coalescing repeated metadata probes ([#5402](https://github.com/manaflow-ai/cmux/pull/5402)) Contributors [![austinywang](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Faustinywang.png%3Fsize%3D48&w=48&q=75)austinywang](https://github.com/austinywang) [![azooz2003-bit](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fazooz2003-bit.png%3Fsize%3D48&w=48&q=75)azooz2003-bit](https://github.com/azooz2003-bit) [![joshrzemien](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fjoshrzemien.png%3Fsize%3D48&w=48&q=75)joshrzemien](https://github.com/joshrzemien) [![lawrencecchen](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Flawrencecchen.png%3Fsize%3D48&w=48&q=75)lawrencecchen](https://github.com/lawrencecchen) [![leodiegoo](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fleodiegoo.png%3Fsize%3D48&w=48&q=75)leodiegoo](https://github.com/leodiegoo) [ cmux 0.64.13](https://cmux.com/docs/changelog/0.64.13) [cmux 0.64.15 ](https://cmux.com/docs/changelog/0.64.15) Canonical: https://cmux.com/docs/changelog/0.64.14 Documentation index: https://cmux.com/llms.txt