validate-macos-app SKILL.md skillA
validate-macos-app from johnkozaris/jko-claude-plugins is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add johnkozaris/jko-claude-plugins/validate-macos-app@git:20260823.7b6e838Pins git:20260823.7b6e838 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- johnkozaris/jko-claude-plugins
- Path
plugins/peekaboo-macos-validator/skills/validate-macos-app/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260823.7b6e838, committed Aug 23, 2026
- Size
- 3,377 bytes
- Repository stars
- 11
- License
- MIT
Validate requested or discovered states in a native macOS app while preserving prior app state.
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
# Validate macOS App Invoke `peekaboo` and validate `$ARGUMENTS`. Parse the first argument as the required bundle ID. Treat the remaining text as optional comma-separated view labels so labels may contain spaces. Parse this in the agent; do not execute `$1`/`shift` in a fresh shell. ## Preflight and ownership Check `peekaboo`, `jq`, selected-runtime permissions, and live help. Use the primary `peekaboo` skill's setup diagnosis for missing prerequisites. Before launch, query `peekaboo list apps --json` for the bundle ID and record whether it is already running. Launch only when absent. Cleanup may quit the app only when this command launched it; preserve a pre-existing process and report that choice. Use an artifact directory outside version control. Add the directory to `.gitignore` when it lives under the repository. Track every task-created path for cleanup. ## Observe and choose states Predict JSON response size before each command. Persist every `see`, `inspect-ui`, browser snapshot, capture result, or other likely-large response to a named file and query only the fields needed for targeting and assertions. …
Read the whole file at its exact version.
How to install
mdr add johnkozaris/jko-claude-plugins/validate-macos-app@sha256:8154ee20dc12759aThe line at the top of this page pins the label git:20260823.7b6e838, 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_65y6snsm34kghre5)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 23, 2026.
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 (3377 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
johnkozaris/jko-claude-plugins · 11 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_65y6snsm34kghre5 GET https://markdownregistry.com/api/v1/resolve?ref=johnkozaris/jko-claude-plugins/validate-macos-app GET https://markdownregistry.com/api/v1/blob/8154ee20dc12759a26855297322e6627c8e57b7f94217b6ce7426512da5f0733
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.