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Agent skill

cmux Browser Surface Control

by manaflow-ai in manaflow-ai/cmux

Opens, inspects, and drives a browser surface through the cmux CLI without stealing the user's focus, always targeting an explicit surface handle.

Custom licenceAuto-check passedProductivity & Automation

Install cmux Browser Surface Control

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

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

GitHub CLI
$ gh skill install manaflow-ai/cmux cmux-browser --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-browser .claude/skills/cmux-browser && 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-browser
GitHub stars
28k
Token cost
~2.7k tokens
SKILL.md length
891 words
Files
13 (incl. references)
Skills in repo
22
Repo updated
First seen
Licence
Custom licence

At a glance

Opens, inspects, and drives a browser surface through the cmux CLI without stealing the user's focus, always targeting an explicit surface handle.

  • Opening a site and extracting data without stealing focus
  • SKILL.md covers Read the CLI contract first, Find an existing browser…, Core workflow and Wait, plus 6 more sections
  • Runs Shell scripts from its folder; calls jq and npx
  • Finding an existing browser surface to reuse instead of opening a new one

What it does

This skill checks the actual cmux browser --help and cmux --version contract before giving an exact command, since there are two different command shapes: surface-creating commands like open or new that need no handle, and every surface-bound navigation, inspection, or interaction command, which must pass a --surface handle explicitly rather than guessing an index.

It finds an existing surface without changing focus using read-only identify and tree commands, which never select a workspace, pane, or browser and never assume the visually focused surface is the one the user means. A filtered all-window tree returns window, workspace, pane, and surface references that can target a browser in a different workspace directly.

When your agent uses it

  • Opening a site and extracting data without stealing focus
  • Finding an existing browser surface to reuse instead of opening a new one
  • Automating a form fill or page inspection through cmux

Example prompts

  • “Open this URL in a new browser surface and get its current state.”
  • “Find the browser surface already open on the pricing page.”
  • “Fill out this form on the open surface without switching my focus to it.”

Requirements

  • cmux CLI installed

What it can do on your machine

Read from SKILL.md and the folder at commit bbb3633. 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

    Ships script files (Shell), which the agent can run.

    Shell commands in SKILL.md call:

    • jq
    • npx

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

  • Network

    No URLs in SKILL.md. Its commands use npx, 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 Browser Surface Control loads about 2.7k tokens when it runs, and up to ~8.5k if it reads all its reference files. Until then it costs about 47 tokens; SKILL.md has 891 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~47
When it runs · the whole SKILL.md, loaded when a task matches
~2.7k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~8.5k

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 891 words (~2,741 tokens).

“Check the binary that will actually run before giving an exact command:”

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

Read the full SKILL.md on GitHub

Files

SKILL.md and 12 other files (references) in skills/cmux-browser of manaflow-ai/cmux.

  • SKILL.md
  • AGENTS.md
  • agents/openai.yaml
  • references/authentication.md
  • references/commands.md
  • references/proxy-support.md
  • references/session-management.md
  • references/snapshot-refs.md
  • references/surface-discovery.md
  • references/video-recording.md
  • templates/authenticated-session.sh
  • templates/capture-workflow.sh
  • templates/form-automation.sh

Open the folder on GitHubat commit bbb3633

Compare with similar skills

cmux Browser Surface Control 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 Browser Surface Control compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
cmux Browser Surface Control this skillmanaflow-ai/cmux28k—~2.7kAutomated safety check: PassCustom licence
Agent Browser CLIvercel-labs/agent-browser44k24 repos~864Automated safety check: PassApache-2.0
Dev Browser AutomationMemTensor/MemOS12k3 repos~1.7kAutomated safety check: PassApache-2.0
Electron App Automationvercel-labs/agent-browser44k5 repos~1.7kAutomated safety check: PassApache-2.0
Next Dev Loopvercel/next.js143k9 repos~2.3kAutomated safety check: PassMIT
Skyvern Browser AutomationSkyvern-AI/skyvern23k1 repos~2.9kAutomated safety check: PassAGPL-3.0

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More from manaflow-ai/cmux

All 22 skills in this repo

  • cmux Diagnostics

    manaflow-ai/cmux

    Runs a read-only health check for cmux and explains what it finds, covering the CLI and socket, settings, agent hooks, session restore and notifications.

    28k GitHub starsUsed in 1 repo~819 tokens
    Auto-check passed

  • cmux Settings Editor

    manaflow-ai/cmux

    Reads and changes cmux preferences in `~/.config/cmux/cmux.json` through a helper that validates each change before writing, covering terminal, browser, viewers and shortcuts.

    28k GitHub stars~2.3k tokensUpdated today
    Auto-check passed

  • cmux Backend Rules

    manaflow-ai/cmux

    Sets the backend TypeScript and Cloud VM rules for cmux: Effect-based services, thin route handlers, Postgres as source of truth, migrations and provider secrets.

    28k GitHub starsUsed in 1 repo~682 tokens
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  • Cmux Debugging Guide

    manaflow-ai/cmux

    Covers debug logging, the Debug menu, profiling rules and runtime pitfalls for working on the cmux macOS terminal app.

    28k GitHub starsUsed in 1 repo~1.1k tokens
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  • Ghostty Submodule and GhosttyKit Workflow

    manaflow-ai/cmux

    Workflow rules for the Ghostty submodule in cmux: rebuilding GhosttyKit.xcframework, pushing fork changes and updating the parent submodule pointer safely.

    28k GitHub starsUsed in 1 repo~580 tokens
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  • Cmux Release Workflow

    manaflow-ai/cmux

    Runs the cmux release process: gathers per-PR changelog lines since the last tag, bumps the version, guards against a bad tag, then tags and pushes the macOS DMG release.

    28k GitHub starsUsed in 1 repo~856 tokens
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Categories

Questions about cmux Browser Surface Control

What does cmux Browser Surface Control do?

Opens, inspects, and drives a browser surface through the cmux CLI without stealing the user's focus, always targeting an explicit surface handle. This skill checks the actual cmux browser --help and cmux --version contract before giving an exact command, since there are two different command shapes: surface-creating commands like open or new that need no handle, and every surface-bound navigation, inspection, or interaction command, which must pass a --surface handle explicitly rather than guessing an index.

When should I use cmux Browser Surface Control?

cmux Browser Surface Control fits situations like: opening a site and extracting data without stealing focus; finding an existing browser surface to reuse instead of opening a new one; automating a form fill or page inspection through cmux.

How do I install cmux Browser Surface Control in Claude Code?

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

How do I install cmux Browser Surface Control in Codex?

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

Can I use cmux Browser Surface Control 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-browser -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-browser, .gemini/skills/cmux-browser, .github/skills/cmux-browser and .opencode/skills/cmux-browser in your project.

What does cmux Browser Surface Control need to run?

Going by SKILL.md and its folder, cmux Browser Surface Control needs a shell for the scripts in its folder and the command-line tools its instructions call (jq and npx). Our summary lists: cmux CLI installed.

Does cmux Browser Surface Control access the network?

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

Is cmux Browser Surface Control 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 Browser Surface Control use?

cmux Browser Surface Control 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 Browser Surface Control use?

About 2.7k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 5.7k tokens, read only when the agent opens those files.

What are the alternatives to cmux Browser Surface Control?

Skills that share tags, products or a category with cmux Browser Surface Control: Agent Browser CLI (vercel-labs/agent-browser, 44k stars), Dev Browser Automation (MemTensor/MemOS, 12k stars), Electron App Automation (vercel-labs/agent-browser, 44k stars) and Next Dev Loop (vercel/next.js, 143k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains cmux Browser Surface Control?

manaflow-ai (a GitHub organization) maintains it in manaflow-ai/cmux, which has 28,076 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 10, 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.