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cmux

v0.64.7 Breaking

This release includes 2 breaking changes for platform teams planning a safe upgrade.

Published 15d CLI & Terminal
✓ No known CVEs patched
Read the diff → Tool health → What is this tool? →

✓ No known CVEs patched in this version

Topics

amp claude-code codex gemini ghostty opencode
+2 more
cli tmux

Summary

AI summary

Broad release touches Thanks to 14 contributors!, browser, fix, and https://github.com/abdullahnauman2.

Changes in this release

Feature Medium

Add agent conversation fork commands

Add agent conversation fork commands

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Document cmux agent skills

Document cmux agent skills

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Add customization and diagnostics skills

Add customization and diagnostics skills

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Add command palette toggle for file opening

Add command palette toggle for file opening

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Show cmux open in CLI help

Show cmux open in CLI help

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Reduce Cloud VM create overhead

Reduce Cloud VM create overhead

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Add Toggle Unread shortcut

Add Toggle Unread shortcut

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Expand cmux customization skill surfaces

Expand cmux customization skill surfaces

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Rename GhosttyTabs project to cmux

Rename GhosttyTabs project to cmux

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Add customization examples library

Add customization examples library

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Add cmux automation skill

Add cmux automation skill

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Feature Medium

Add Grok Build CLI integration

Add Grok Build CLI integration

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Preserve unread indicators across session restore

Preserve unread indicators across session restore

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Fix Slack composer Cmd+C in browser panes

Fix Slack composer Cmd+C in browser panes

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Mark workspace unread when a tab is marked unread

Mark workspace unread when a tab is marked unread

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Reconcile provider-deleted Cloud VMs before active limits

Reconcile provider-deleted Cloud VMs before active limits

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Fix duplicate Codex monitor helpers

Fix duplicate Codex monitor helpers

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Fix background new-workspace commands

Fix background new-workspace commands

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Fix task manager attribution for launchd-parented helpers

Fix task manager attribution for launchd-parented helpers

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Optimize command palette search

Optimize command palette search

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Fix browser showOpenFilePicker support

Fix browser showOpenFilePicker support

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Drop runtime-only flags from agent resume commands

Drop runtime-only flags from agent resume commands

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Fix omnibar arrow key focus races

Fix omnibar arrow key focus races

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Fix offscreen terminal helper PTY startup

Fix offscreen terminal helper PTY startup

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Fix browser deep-link popups (slack://, discord://, etc.)

Fix browser deep-link popups (slack://, discord://, etc.)

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Preserve Codex plugin config during hook setup

Preserve Codex plugin config during hook setup

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Ignore foreign crash breadcrumb files

Ignore foreign crash breadcrumb files

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Fix background workspace PTY startup for socket-created surfaces

Fix background workspace PTY startup for socket-created surfaces

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Medium

Keep SSH pane close from killing sibling panes

Keep SSH pane close from killing sibling panes

Source: granite4.1:8b-q6_K@2026-05-19

Confidence: high

Bugfix Low

Expose webview lifecycle state in top bar

Expose webview lifecycle state in top bar

Source: granite4.1:30b@2026-05-19-audit

Confidence: low

Full changelog

What's Changed

  • Preserve unread indicators across session restore by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4130
  • Fix Slack composer Cmd+C in browser panes by @austinywang in https://github.com/manaflow-ai/cmux/pull/4126
  • Mark workspace unread when a tab is marked unread by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4169
  • Reconcile provider-deleted Cloud VMs before active limits by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4142
  • Fix duplicate Codex monitor helpers by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4164
  • Fix background new-workspace commands by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4137
  • Document cmux agent skills by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4203
  • Add agent conversation fork commands by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4198
  • Remove release skill from cmux repo by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4219
  • Fix task manager attribution for launchd-parented helpers by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4190
  • Optimize command palette search by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4043
  • Fix browser showOpenFilePicker support by @austinywang in https://github.com/manaflow-ai/cmux/pull/4122
  • Drop runtime-only flags from agent resume commands by @austinywang in https://github.com/manaflow-ai/cmux/pull/4196
  • Fix omnibar arrow key focus races by @austinywang in https://github.com/manaflow-ai/cmux/pull/4183
  • Add customization and diagnostics skills by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4222
  • Add command palette toggle for file opening by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4208
  • Show cmux open in CLI help by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4206
  • Reduce Cloud VM create overhead by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4202
  • Fix Cmd-N routing from browser omnibar by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4038
  • Expand cmux customization skill surfaces by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4236
  • Rename GhosttyTabs project to cmux by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4205
  • Add customization examples library by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4246
  • Fix offscreen terminal helper PTY startup by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4233
  • Add Toggle Unread shortcut by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4231
  • Fix browser deep-link popups (slack://, discord://, etc.) by @austinywang in https://github.com/manaflow-ai/cmux/pull/4226
  • Preserve Codex plugin config during hook setup by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4270
  • Ignore foreign crash breadcrumb files by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4271
  • Fix background workspace PTY startup for socket-created surfaces by @austinywang in https://github.com/manaflow-ai/cmux/pull/3876
  • Keep SSH pane close from killing sibling panes by @austinywang in https://github.com/manaflow-ai/cmux/pull/3995
  • browser: expose webview lifecycle state in top by @lidge-jun in https://github.com/manaflow-ai/cmux/pull/4243
  • Fix Claude sidebar resume config dir by @austinywang in https://github.com/manaflow-ai/cmux/pull/4116
  • browser: discard hidden webviews for memory by @lidge-jun in https://github.com/manaflow-ai/cmux/pull/4244
  • Fix surface tab bar action buttons clipping by @austinywang in https://github.com/manaflow-ai/cmux/pull/4121
  • Cmd-click reload duplicates browser tab by @austinywang in https://github.com/manaflow-ai/cmux/pull/4284
  • Fix variant-aware CLI socket fallback by @austinywang in https://github.com/manaflow-ai/cmux/pull/3543
  • Fix Web Inspector blank restore and close crash by @austinywang in https://github.com/manaflow-ai/cmux/pull/4182
  • Fix #3511: discover cmux user themes by @austinywang in https://github.com/manaflow-ai/cmux/pull/3956
  • Suppress browser editing shortcut replay by @austinywang in https://github.com/manaflow-ai/cmux/pull/4186
  • Let terminal tabs move into existing workspaces by @austinywang in https://github.com/manaflow-ai/cmux/pull/3890
  • Add cmux automation skill by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4301
  • Fix tagged dev CLI socket selection by @austinywang in https://github.com/manaflow-ai/cmux/pull/4193
  • Fix conditional light theme foreground rendering by @austinywang in https://github.com/manaflow-ai/cmux/pull/4278
  • browser: add hidden webview discard settings by @lidge-jun in https://github.com/manaflow-ai/cmux/pull/4245
  • Open markdown files with shared viewer path by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4285
  • Revert cmux automation skill by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4305
  • Open crash diagnostics from notifications by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4296
  • Fix Cmd-hover bounds for spaced file paths by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4291
  • Allow tab header double-click to zoom panes by @austinywang in https://github.com/manaflow-ai/cmux/pull/3892
  • Fix browser omnibar IME candidate window for Japanese / Zhuyin by @austinywang in https://github.com/manaflow-ai/cmux/pull/4268
  • Fix task manager process accounting accuracy by @austinywang in https://github.com/manaflow-ai/cmux/pull/4132
  • Preserve markdown renderer during drops by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4298
  • Fix nightly startup crash by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4318
  • Add i18n review bot rule by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4324
  • Fix markdown viewer image rendering by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4288
  • Expose set-status priority by @austinywang in https://github.com/manaflow-ai/cmux/pull/4064
  • Add surface resume bindings by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4237
  • Avoid idle background terminal surface priming by @austinywang in https://github.com/manaflow-ai/cmux/pull/4184
  • Fix permission notifications after auto-allow by @austinywang in https://github.com/manaflow-ai/cmux/pull/3924
  • fix: don't auto-resume agent when it was already exited before snapshot by @wowpotato in https://github.com/manaflow-ai/cmux/pull/4269
  • Add CLI and socket API stress harness by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4330
  • Fix #3732: prevent omo plugin warning loop by @austinywang in https://github.com/manaflow-ai/cmux/pull/3960
  • Preload CLI-created browser panes offscreen by @austinywang in https://github.com/manaflow-ai/cmux/pull/4345
  • Fix ripgrep resolution for Nix installs by @austinywang in https://github.com/manaflow-ai/cmux/pull/3946
  • Fix CLI surface resume approval hang by @lawrencecchen in https://github.com/manaflow-ai/cmux/pull/4360
  • Fix NIGHTLY update bundle icon metadata by @austinywang in https://github.com/manaflow-ai/cmux/pull/4353
  • Add Grok Build CLI integration by @austinywang in https://github.com/manaflow-ai/cmux/pull/4225
  • Release v0.64.7 by @austinywang in https://github.com/manaflow-ai/cmux/pull/4372

New Contributors

  • @lidge-jun made their first contribution in https://github.com/manaflow-ai/cmux/pull/4243
  • @wowpotato made their first contribution in https://github.com/manaflow-ai/cmux/pull/4269

Full Changelog: https://github.com/manaflow-ai/cmux/compare/v0.64.6...v0.64.7

Thanks to 14 contributors!

See CHANGELOG.md for curated user-facing release notes.

Breaking Changes

  • Removed runtime-only flags from cmux agent resume commands
  • Renamed the GhosttyTabs project to cmux

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About cmux

Ghostty-based macOS terminal with vertical tabs and notifications for AI coding agents

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Beta — feedback welcome: [email protected]