ui-control SKILL.md skillA
ui-control from yarlson/yarstack is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add yarlson/yarstack/ui-control@git:20261017.2f2e03bPins git:20261017.2f2e03b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- yarlson/yarstack
- Path
plugins/yarstack/skills/ui-control/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261017.2f2e03b, committed Oct 17, 2026
- First version recorded
- Jul 17, 2026
- Size
- 2,403 bytes
- Repository stars
- 3
- License
- MIT
Verify graphical browser, desktop, or Electron behavior through the actual interface. Use when screenshot, accessibility, console, network, trace, or browser-driven evidence is required; not for terminal-hosted interfaces, which belong to cli-control.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# UI Control Gather reproducible evidence from the actual graphical surface without changing production behavior. ## Workflow 1. Identify the target surface, build or session, and observable contract. 2. Reuse the authorized running or authenticated surface when it is the target. Start a local app only when necessary and authorized. In a real authenticated session, an action can be an external write. Perform the interactions the user asked you to verify through the interface, such as submitting a form with invalid input to see it rejected. Never send requests directly to the server, and do not submit valid data, send, purchase, delete, or change settings beyond those interactions without explicit authority. 3. Prefer existing repository harnesses. Otherwise use the host's browser tools, or Playwright when it is already installed; do not install automation for a one-off probe. Locate controls by stable roles, labels, identifiers, or application markers. 4. Perform only actions needed for the requested behavior or a concrete risk. After each action, wait for its observable result instead of a fixed delay, and confirm it before the next action. …
Read the whole file at its exact version.
How to install
mdr add yarlson/yarstack/ui-control@sha256:e01717bbeec46f21The line at the top of this page pins the label git:20261017.2f2e03b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_5htvwuzhap5tg7rs)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 17, 2026 and Oct 17, 2026, about one every 46 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261017.2f2e03b latest | 2026-10-17 | 2f2e03b | 2,403 B | A | view · diff |
| git:20260718.206351f | 2026-07-18 | 206351f | 1,575 B | A | view · diff |
| git:20260717.dc9a72d | 2026-07-17 | dc9a72d | 1,613 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2403 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
yarlson/yarstack · 3 stars · license MIT · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_5htvwuzhap5tg7rs GET https://markdownregistry.com/api/v1/resolve?ref=yarlson/yarstack/ui-control GET https://markdownregistry.com/api/v1/blob/e01717bbeec46f21b8a721a442077f0a503243ca393eb9512d9b753024149bed
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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