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Agent skill

cmux Custom Sidebar

by manaflow-ai in manaflow-ai/cmux

Builds a custom cmux sidebar from a plain-language request by writing an interpreted SwiftUI-style file that hot-reloads and binds to live workspace data.

Custom licenceAuto-check passedProductivity & Automation

Install cmux Custom Sidebar

skills CLI
$ npx skills add manaflow-ai/cmux --skill cmux-custom-sidebar -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install manaflow-ai/cmux cmux-custom-sidebar --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/manaflow-ai/cmux.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cmux-custom-sidebar .claude/skills/cmux-custom-sidebar && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
cmux-custom-sidebar
GitHub stars
28k
Used in
1 other repo
Token cost
~1.6k tokens
SKILL.md length
624 words
Files
1
Skills in repo
22
Repo updated
First seen
Licence
Custom licence

At a glance

Builds a custom cmux sidebar from a plain-language request by writing an interpreted SwiftUI-style file that hot-reloads and binds to live workspace data.

  • Works in 4 steps: Enable the beta (once): Settings > Beta… → Write a named file at… → Validate and select → …
  • Creating a sidebar that shows workspaces, tabs, PRs or a clock in cmux
  • SKILL.md covers Workflow, Authoring rules, Quick start and Live data context (read-only,…, plus 3 more sections
  • Calls curl and swift

What it does

cmux renders custom sidebars at runtime from a small SwiftUI-style file, so there is no Xcode project, build step or signing. The agent takes a described result, such as a sidebar that lists workspaces and lets you jump between them, makes the engineering choices itself and avoids quizzing you about syntax. The workflow enables the Custom sidebars beta flag, writes a named .swift file under ~/.config/cmux/sidebars, then validates and selects it with cmux sidebar validate and cmux sidebar select.

Saving hot-reloads the sidebar, with cmux sidebar reload to force it, and the agent checks that rows show real data and taps run the right command. Authoring rules say to bind to the workspaces context instead of hard-coded text, run matching cmux actions on tap, use Reorderable for workspace lists, keep the layout simple, cap long lists because the view re-evaluates about once a second, and stay within the supported syntax. The full authoring contract is available through cmux docs sidebars.

When your agent uses it

  • Creating a sidebar that shows workspaces, tabs, PRs or a clock in cmux
  • Editing a sidebar file under ~/.config/cmux/sidebars
  • Making sidebar rows run cmux commands when tapped
  • Troubleshooting a written sidebar that does not appear in the picker

Example prompts

  • “Make me a cmux sidebar that lists my workspaces and lets me jump between them.”
  • “Add the current git branch and open PRs to my sidebar and cap the list length.”
  • “My new sidebar is missing from the picker, so check the beta flag and validate the file.”

Requirements

  • cmux with the Custom sidebars beta feature enabled

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Enable the beta (once): Settings > Beta features > Custom sidebars (customSidebars.beta.enabled). If a written sidebar does not appear in…
  2. Write a named file at ~/.config/cmux/sidebars/.swift. The name becomes the menu label; use short kebab-case. The file is a single…
  3. Validate and select
  4. Iterate. Saving hot-reloads in place (cmux sidebar reload forces it). Verify rows show real data and taps do the right thing before…

What it can do on your machine

Read from SKILL.md and the folder at commit 1e82fa4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • curl
    • swift

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use curl, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

cmux Custom Sidebar loads about 1.6k tokens when it runs. Until then it costs about 95 tokens; SKILL.md has 624 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~95
When it runs · the whole SKILL.md, loaded when a task matches
~1.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 624 words (~1,576 tokens).

“cmux renders custom sidebars from a small SwiftUI-style file at runtime: no Xcode, no build step, no signing. The file hot-reloads on save, binds to live cmux state (workspaces, tabs, git, PRs, clock), and runs real cmux commands on tap.”

— opening of SKILL.md by manaflow-ai, Custom licence
name
cmux-custom-sidebar

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/cmux-custom-sidebar of manaflow-ai/cmux.

Open the folder on GitHubat commit 1e82fa4

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in manaflow-ai/cmux, which our catalogue first saw on October 7, 2026.

Compare with similar skills

cmux Custom Sidebar next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

cmux Custom Sidebar compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
cmux Custom Sidebar this skillmanaflow-ai/cmux28k1 repos~1.6kAutomated safety check: PassCustom licence
SwiftUI Design SkillWholiver/swiftui-design-skill204—~2.8kAutomated safety check: PassMIT
Swiftui Animation MatchRayFernando1337/rayfernando-skills130—~1.3kAutomated safety check: PassApache-2.0
UI Review TahoeKartikLabhshetwar/better-shot2.4k2 repos~1.7kAutomated safety check: PassCustom licence
Flow Next Drivegmickel/flow-next709—~3.6kAutomated safety check: PassMIT
Coding Best PracticesKartikLabhshetwar/better-shot2.4k2 repos~1.8kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about cmux Custom Sidebar

What does cmux Custom Sidebar do?

Builds a custom cmux sidebar from a plain-language request by writing an interpreted SwiftUI-style file that hot-reloads and binds to live workspace data. cmux renders custom sidebars at runtime from a small SwiftUI-style file, so there is no Xcode project, build step or signing. The agent takes a described result, such as a sidebar that lists workspaces and lets you jump between them, makes the engineering choices itself and avoids quizzing you about syntax.

When should I use cmux Custom Sidebar?

cmux Custom Sidebar fits situations like: creating a sidebar that shows workspaces, tabs, PRs or a clock in cmux; editing a sidebar file under ~/.config/cmux/sidebars; making sidebar rows run cmux commands when tapped; troubleshooting a written sidebar that does not appear in the picker.

How do I install cmux Custom Sidebar in Claude Code?

Run `npx skills add manaflow-ai/cmux --skill cmux-custom-sidebar -a claude-code`. Or copy the skill folder (skills/cmux-custom-sidebar in manaflow-ai/cmux) into .claude/skills/cmux-custom-sidebar in your project. Claude Code loads it when a task matches its description.

How do I install cmux Custom Sidebar in Codex?

Run `npx skills add manaflow-ai/cmux --skill cmux-custom-sidebar -a codex`. Or copy the skill folder (skills/cmux-custom-sidebar in manaflow-ai/cmux) into .agents/skills/cmux-custom-sidebar in your project. Codex loads it when a task matches its description.

Can I use cmux Custom Sidebar in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add manaflow-ai/cmux --skill cmux-custom-sidebar -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cmux-custom-sidebar, .gemini/skills/cmux-custom-sidebar, .github/skills/cmux-custom-sidebar and .opencode/skills/cmux-custom-sidebar in your project.

What does cmux Custom Sidebar need to run?

Going by SKILL.md and its folder, cmux Custom Sidebar needs the command-line tools its instructions call (curl and swift). Our summary lists: cmux with the Custom sidebars beta feature enabled.

Does cmux Custom Sidebar access the network?

SKILL.md contains no URLs. Its commands use curl, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is cmux Custom Sidebar safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does cmux Custom Sidebar use?

cmux Custom Sidebar has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does cmux Custom Sidebar use?

About 1.6k tokens (SKILL.md is roughly 6.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to cmux Custom Sidebar?

Skills that share tags, products or a category with cmux Custom Sidebar: SwiftUI Design Skill (Wholiver/swiftui-design-skill, 204 stars), Swiftui Animation Match (RayFernando1337/rayfernando-skills, 130 stars), UI Review Tahoe (KartikLabhshetwar/better-shot, 2.4k stars) and Flow Next Drive (gmickel/flow-next, 709 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains cmux Custom Sidebar?

manaflow-ai (a GitHub organization) maintains it in manaflow-ai/cmux, which has 28,092 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 11, 2026.

Source: manaflow-ai/cmux on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.