d72b014d6d
* Add markdown viewer panel with live file watching Introduce a new PanelType.markdown that renders .md files in a dedicated panel using MarkdownUI (SwiftUI), with live file watching via DispatchSource so content auto-updates when the file changes on disk. - New MarkdownPanel class with file system watcher (write/delete/rename/extend) - New MarkdownPanelView with custom cmux theme (headings, code blocks, tables, blockquotes, inline code, lists, horizontal rules, light/dark mode) - Full workspace integration: SurfaceKind, creation methods, tab subscription - Session persistence: snapshot/restore across app restarts - V2 socket command: markdown.open (validates path, resolves workspace, splits) - CLI command: cmux markdown open <path> with routing flags and help text - Agent skill: skills/cmux-markdown/ with SKILL.md, openai.yaml, and references - Cross-link from skills/cmux/SKILL.md to the new markdown skill - SPM dependency: gonzalezreal/swift-markdown-ui 2.4.1 * Fix unreachable guard in markdown subcommand dispatch Use looksLikePath() to distinguish subcommands from path arguments so the guard can catch unknown subcommands and future subcommands are parsed correctly. * Use .isoLatin1 fallback instead of .ascii for encoding recovery ASCII is a strict subset of UTF-8, so falling back to .ascii after UTF-8 fails is dead code. Use .isoLatin1 which accepts all 256 byte values and covers legacy encodings like Windows-1252. * Mark fileWatchSource as nonisolated(unsafe) for deinit safety deinit is not guaranteed to run on the main actor, so accessing @MainActor-isolated storage is a data race under strict concurrency. DispatchSource.cancel() is thread-safe, so nonisolated(unsafe) is sufficient with a documented invariant that writes only occur on main. * Fix file watcher reattach: retry loop with cancellation guard - Replace one-shot 500ms retry with up to 6 attempts (3s total window) so files that reappear after a slow atomic replace are picked up - Add isClosed flag checked before each retry to prevent restarting the watcher after close()/deinit * Harden path validation in markdown.open command Reject directories and non-absolute paths before panel creation to prevent ambiguous behavior and generic downstream failures. * Always reattach file watcher on delete/rename events After an atomic save (delete old + create new), the DispatchSource still points to the old inode. Previously we only reattached when the file was unreadable, so successful atomic saves left the watcher on a stale inode and live updates silently stopped. Now we always stop and reattach: immediately if the new file is readable, via retry loop if not. * Restore markdown panels even when file is missing at launch MarkdownPanel already handles unavailable files gracefully (shows 'file unavailable' UI and retries via the reattach loop). Dropping the panel on restore lost the user's layout for files that may reappear shortly after (network drives, build artifacts, etc.). * Harden markdown CLI parsing and startup reconnect behavior --------- Co-authored-by: Lawrence Chen <54008264+lawrencecchen@users.noreply.github.com> |
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|---|---|---|
| .claude/commands | ||
| .github | ||
| Assets.xcassets | ||
| CLI | ||
| cmuxTests | ||
| cmuxUITests | ||
| design | ||
| docs | ||
| ghostty@7dd589824d | ||
| GhosttyTabs.xcodeproj | ||
| homebrew-cmux@dcfaa081e5 | ||
| node_modules | ||
| Resources | ||
| scripts | ||
| skills | ||
| Sources | ||
| tests | ||
| tests_v2 | ||
| vendor | ||
| web | ||
| .gitignore | ||
| .gitkeep | ||
| .gitmodules | ||
| .vercelignore | ||
| AGENTS.md | ||
| bun.lock | ||
| CHANGELOG.md | ||
| CLAUDE.md | ||
| cmux-Bridging-Header.h | ||
| cmux.entitlements | ||
| CONTRIBUTING.md | ||
| ghostty.h | ||
| LICENSE | ||
| package.json | ||
| Package.resolved | ||
| Package.swift | ||
| PROJECTS.md | ||
| README.ar.md | ||
| README.bs.md | ||
| README.da.md | ||
| README.de.md | ||
| README.es.md | ||
| README.fr.md | ||
| README.it.md | ||
| README.ja.md | ||
| README.ko.md | ||
| README.md | ||
| README.no.md | ||
| README.pl.md | ||
| README.pt-BR.md | ||
| README.ru.md | ||
| README.th.md | ||
| README.tr.md | ||
| README.zh-CN.md | ||
| README.zh-TW.md | ||
| THIRD_PARTY_LICENSES.md | ||
| TODO.md | ||
cmux
A Ghostty-based macOS terminal with vertical tabs and notifications for AI coding agents
English | 简体中文 | 繁體中文 | 한국어 | Deutsch | Español | Français | Italiano | Dansk | 日本語 | Polski | Русский | Bosanski | العربية | Norsk | Português (Brasil) | ไทย | Türkçe
▶ Demo video · The Zen of cmux
Features
Notification ringsPanes get a blue ring and tabs light up when coding agents need your attention |
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Notification panelSee all pending notifications in one place, jump to the most recent unread |
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In-app browserSplit a browser alongside your terminal with a scriptable API ported from agent-browser |
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Vertical + horizontal tabsSidebar shows git branch, linked PR status/number, working directory, listening ports, and latest notification text. Split horizontally and vertically. |
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- Scriptable — CLI and socket API to create workspaces, split panes, send keystrokes, and automate the browser
- Native macOS app — Built with Swift and AppKit, not Electron. Fast startup, low memory.
- Ghostty compatible — Reads your existing
~/.config/ghostty/configfor themes, fonts, and colors - GPU-accelerated — Powered by libghostty for smooth rendering
Install
DMG (recommended)
Open the .dmg and drag cmux to your Applications folder. cmux auto-updates via Sparkle, so you only need to download once.
Homebrew
brew tap manaflow-ai/cmux
brew install --cask cmux
To update later:
brew upgrade --cask cmux
On first launch, macOS may ask you to confirm opening an app from an identified developer. Click Open to proceed.
Why cmux?
I run a lot of Claude Code and Codex sessions in parallel. I was using Ghostty with a bunch of split panes, and relying on native macOS notifications to know when an agent needed me. But Claude Code's notification body is always just "Claude is waiting for your input" with no context, and with enough tabs open I couldn't even read the titles anymore.
I tried a few coding orchestrators but most of them were Electron/Tauri apps and the performance bugged me. I also just prefer the terminal since GUI orchestrators lock you into their workflow. So I built cmux as a native macOS app in Swift/AppKit. It uses libghostty for terminal rendering and reads your existing Ghostty config for themes, fonts, and colors.
The main additions are the sidebar and notification system. The sidebar has vertical tabs that show git branch, linked PR status/number, working directory, listening ports, and the latest notification text for each workspace. The notification system picks up terminal sequences (OSC 9/99/777) and has a CLI (cmux notify) you can wire into agent hooks for Claude Code, OpenCode, etc. When an agent is waiting, its pane gets a blue ring and the tab lights up in the sidebar, so I can tell which one needs me across splits and tabs. Cmd+Shift+U jumps to the most recent unread.
The in-app browser has a scriptable API ported from agent-browser. Agents can snapshot the accessibility tree, get element refs, click, fill forms, and evaluate JS. You can split a browser pane next to your terminal and have Claude Code interact with your dev server directly.
Everything is scriptable through the CLI and socket API — create workspaces/tabs, split panes, send keystrokes, open URLs in the browser.
The Zen of cmux
cmux is not prescriptive about how developers hold their tools. It's a terminal and browser with a CLI, and the rest is up to you.
cmux is a primitive, not a solution. It gives you a terminal, a browser, notifications, workspaces, splits, tabs, and a CLI to control all of it. cmux doesn't force you into an opinionated way to use coding agents. What you build with the primitives is yours.
The best developers have always built their own tools. Nobody has figured out the best way to work with agents yet, and the teams building closed products definitely haven't either. The developers closest to their own codebases will figure it out first.
Give a million developers composable primitives and they'll collectively find the most efficient workflows faster than any product team could design top-down.
Keyboard Shortcuts
Workspaces
| Shortcut | Action |
|---|---|
| ⌘ N | New workspace |
| ⌘ 1–8 | Jump to workspace 1–8 |
| ⌘ 9 | Jump to last workspace |
| ⌃ ⌘ ] | Next workspace |
| ⌃ ⌘ [ | Previous workspace |
| ⌘ ⇧ W | Close workspace |
| ⌘ ⇧ R | Rename workspace |
| ⌘ B | Toggle sidebar |
Surfaces
| Shortcut | Action |
|---|---|
| ⌘ T | New surface |
| ⌘ ⇧ ] | Next surface |
| ⌘ ⇧ [ | Previous surface |
| ⌃ Tab | Next surface |
| ⌃ ⇧ Tab | Previous surface |
| ⌃ 1–8 | Jump to surface 1–8 |
| ⌃ 9 | Jump to last surface |
| ⌘ W | Close surface |
Split Panes
| Shortcut | Action |
|---|---|
| ⌘ D | Split right |
| ⌘ ⇧ D | Split down |
| ⌥ ⌘ ← → ↑ ↓ | Focus pane directionally |
| ⌘ ⇧ H | Flash focused panel |
Browser
Browser developer-tool shortcuts follow Safari defaults and are customizable in Settings → Keyboard Shortcuts.
| Shortcut | Action |
|---|---|
| ⌘ ⇧ L | Open browser in split |
| ⌘ L | Focus address bar |
| ⌘ [ | Back |
| ⌘ ] | Forward |
| ⌘ R | Reload page |
| ⌥ ⌘ I | Toggle Developer Tools (Safari default) |
| ⌥ ⌘ C | Show JavaScript Console (Safari default) |
Notifications
| Shortcut | Action |
|---|---|
| ⌘ I | Show notifications panel |
| ⌘ ⇧ U | Jump to latest unread |
Find
| Shortcut | Action |
|---|---|
| ⌘ F | Find |
| ⌘ G / ⌘ ⇧ G | Find next / previous |
| ⌘ ⇧ F | Hide find bar |
| ⌘ E | Use selection for find |
Terminal
| Shortcut | Action |
|---|---|
| ⌘ K | Clear scrollback |
| ⌘ C | Copy (with selection) |
| ⌘ V | Paste |
| ⌘ + / ⌘ - | Increase / decrease font size |
| ⌘ 0 | Reset font size |
Window
| Shortcut | Action |
|---|---|
| ⌘ ⇧ N | New window |
| ⌘ , | Settings |
| ⌘ ⇧ , | Reload configuration |
| ⌘ Q | Quit |
Nightly Builds
cmux NIGHTLY is a separate app with its own bundle ID, so it runs alongside the stable version. Built automatically from the latest main commit and auto-updates via its own Sparkle feed.
Session restore (current behavior)
On relaunch, cmux currently restores app layout and metadata only:
- Window/workspace/pane layout
- Working directories
- Terminal scrollback (best effort)
- Browser URL and navigation history
cmux does not restore live process state inside terminal apps. For example, active Claude Code/tmux/vim sessions are not resumed after restart yet.
Star History
Contributing
Ways to get involved:
- Follow us on X for updates @manaflowai or @lawrencecchen
- Join the conversation on Discord
- Create and participate in GitHub issues and discussions
- Let me know what you're building with cmux
Community
Founder's Edition
cmux is free, open source, and always will be. If you'd like to support development and get early access to what's coming next:
- Prioritized feature requests/bug fixes
- Early access: cmux AI that gives you context on every workspace, tab and panel
- Early access: iOS app with terminals synced between desktop and phone
- Early access: Cloud VMs
- Early access: Voice mode
- My personal iMessage/WhatsApp
License
This project is licensed under the GNU Affero General Public License v3.0 or later (AGPL-3.0-or-later).
See LICENSE for the full text.