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Official agent skill

Control UI

by cursor in cursor/plugins

Build or adapt a local browser/CDP harness to drive and inspect a web, IDE, or Electron UI.

OfficialNo licenceAuto-check passedFrontend & Design

Install Control UI

skills CLI
$ npx skills add cursor/plugins --skill control-ui -a claude-code

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

GitHub CLI
$ gh skill install cursor/plugins control-ui --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/cursor/plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cursor-team-kit/skills/control-ui .claude/skills/control-ui && 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
control-ui
GitHub stars
10k
Used in
2 other repos
Token cost
~1.2k tokens
SKILL.md length
502 words
Files
1
Skills in repo
99
Repo updated
First seen
Licence
None found

At a glance

Build or adapt a local browser/CDP harness to drive and inspect a web, IDE, or Electron UI.

  • Works in 6 steps: Start the app locally using the repo's… → Discover existing local harnesses:… → For a web app, connect to the local URL… → …
  • Local UI verification
  • SKILL.md covers What It Is Used For, Setup Pattern, Generic Web Harness and Generic CDP Harness, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Control UI is an agent skill from cursor/plugins, published by the product's own GitHub organization. Build or adapt a local browser/CDP harness to drive and inspect a web, IDE, or Electron UI. Use for local UI verification, screenshots, accessibility snapshots, perf profiles, visual diffs, or reproducing UI bugs.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering Visual regression testing, Mobile testing and debugging and Accessibility. It works with Playwright. The repository describes itself as: Cursor plugin specification and official plugins.

When your agent uses it

  • Local UI verification
  • Accessibility snapshots
  • Reproducing UI bugs

Example prompts

  • “/control-ui”

Workflow steps

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

  1. Start the app locally using the repo's documented dev command.
  2. Discover existing local harnesses: Playwright tests, Cypress specs, Storybook, browser scripts, Electron launch scripts, or snapshot tools.
  3. For a web app, connect to the local URL with the existing browser tooling.
  4. For Electron/Chromium, enable a remote debugging port when supported.
  5. Select the correct page by stable app markers, not by tab order alone.
  6. Prefer accessibility roles, labels, and stable data-* selectors over coordinates.

What it can do on your machine

Read from SKILL.md and the folder at commit 9f451cf. 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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript).

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

  • Network

    No URLs in SKILL.md.

    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

Control UI loads about 1.2k tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 502 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~56
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 502 words (~1,201 tokens).

“Use local browser automation to verify UI behavior with evidence. First reuse the repo's own Playwright, browser, or Electron harness if it exists; otherwise assemble a temporary local harness around the app's dev server or Chromium debug port.”

— opening of SKILL.md by cursor
name
control-ui

Read the full SKILL.md on GitHub

Files

Just SKILL.md in cursor-team-kit/skills/control-ui of cursor/plugins.

Open the folder on GitHubat commit 9f451cf

Used in 2 other repositories

We found 5 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in cursor/plugins, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Control UI 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.

Control UI compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Control UI this skillcursor/plugins10k2 repos~1.2kAutomated safety check: PassNone
Common Web Visual TestingHoangNguyen0403/agent-skills-standard570—~760Automated safety check: PassMIT
Browser QAaffaan-m/ECC274k2 repos~1kAutomated safety check: PassMIT
UI UX Auditchmonitor/chmonitor298—~2kAutomated safety check: NotesGPL-3.0
Vrtmarigold-ui/marigold146—~787Automated safety check: PassMIT
UI Visual DebuggingNangoHQ/nango13k—~1.3kAutomated safety check: PassCustom licence

Similar skills

  • Common Web Visual Testing

    HoangNguyen0403/agent-skills-standard

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    570 GitHub stars~760 tokensUpdated yesterday
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  • Browser QA

    affaan-m/ECC

    Run automated post-deploy UI verification with a browser automation MCP (claude-in-chrome, Playwright, or Puppeteer): console-error and Core Web Vitals smoke checks, form and auth-flow interaction…

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  • UI UX Audit

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    298 GitHub stars~2k tokensUpdated yesterday
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  • Vrt

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    DST — Trigger the Visual-Regression-Tests (Chromatic) GitHub Actions workflow on the current or a given branch.

    146 GitHub stars~787 tokensUpdated yesterday
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  • UI Visual Debugging

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    A skill your agent uses when modifying or visually debugging Nango frontend UI, including packages/webapp, packages/connect-ui, browser interactions, screenshots, and visual regressions.

    13k GitHub stars~1.3k tokensUpdated today
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  • Accessibility Testing

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  • Reflect on Session Learnings

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  • Technical Writing Standard

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    Applies four layers of technical-writing rules to docs, RFCs, readmes, PR descriptions and commit messages so a tired engineer follows them on the first read.

    10k GitHub starsUsed in 10 repos~2.4k tokens
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  • Advisor Mode

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    Adds a second, stronger model that the main agent consults before major decisions, when stuck and before finishing, controlled by /advisor commands.

    10k GitHub stars~2.6k tokensUpdated today
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Works with

Categories

Questions about Control UI

What does Control UI do?

Build or adapt a local browser/CDP harness to drive and inspect a web, IDE, or Electron UI. Control UI is an agent skill from cursor/plugins, published by the product's own GitHub organization. Build or adapt a local browser/CDP harness to drive and inspect a web, IDE, or Electron UI.

When should I use Control UI?

Control UI fits situations like: local UI verification; accessibility snapshots; reproducing UI bugs.

How do I install Control UI in Claude Code?

Run `npx skills add cursor/plugins --skill control-ui -a claude-code`. Or copy the skill folder (cursor-team-kit/skills/control-ui in cursor/plugins) into .claude/skills/control-ui in your project. Claude Code loads it when a task matches its description.

How do I install Control UI in Codex?

Run `npx skills add cursor/plugins --skill control-ui -a codex`. Or copy the skill folder (cursor-team-kit/skills/control-ui in cursor/plugins) into .agents/skills/control-ui in your project. Codex loads it when a task matches its description.

Can I use Control UI 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 cursor/plugins --skill control-ui -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/control-ui, .gemini/skills/control-ui, .github/skills/control-ui and .opencode/skills/control-ui in your project.

What does Control UI need to run?

SKILL.md names no scripts, command-line tools or credentials: Control UI is instructions for the agent only.

Does Control UI access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Control UI 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 Control UI use?

No licence was found for Control UI or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Control UI use?

About 1.2k tokens (SKILL.md is roughly 4.8k 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 Control UI?

Skills that share tags, products or a category with Control UI: Common Web Visual Testing (HoangNguyen0403/agent-skills-standard, 570 stars), Browser QA (affaan-m/ECC, 274k stars), UI UX Audit (chmonitor/chmonitor, 298 stars) and Vrt (marigold-ui/marigold, 146 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Control UI?

cursor (a GitHub organization, an official publisher) maintains it in cursor/plugins, which has 10,130 GitHub stars. The repository holds 99 skills in this directory. The repository was last updated on October 6, 2026.

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