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Agent skill

Authz Check

by Archive228 in Archive228/loopkit

Verify that an endpoint checks ownership, not just authentication.

MITAuto-check passedBackend & APIs

Install Authz Check

skills CLI
$ npx skills add Archive228/loopkit --skill authz-check -a claude-code

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

GitHub CLI
$ gh skill install Archive228/loopkit authz-check --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/Archive228/loopkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/authz-check .claude/skills/authz-check && 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
authz-check
GitHub stars
756
Token cost
~220 tokens
SKILL.md length
98 words
Files
1
Skills in repo
43
Repo updated
First seen
Licence
MIT

At a glance

Verify that an endpoint checks ownership, not just authentication.

  • Tasks that involve Authorization and RBAC
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Authz Check is an agent skill from Archive228/loopkit. Verify that an endpoint checks ownership, not just authentication. Use on any handler that reads or mutates user data.

Its SKILL.md is about 220 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 Backend & APIs, covering Authorization and RBAC. The repository describes itself as: 33 battle-tested skills + minimal .claude harness for any coding agent (Claude Code, Cursor, Codex, Gemini CLI). The licence is MIT.

When your agent uses it

  • Tasks that involve Authorization and RBAC

Example prompts

  • “/authz-check”

What it can do on your machine

Read from SKILL.md and the folder at commit 5ae033e. 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.

    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

Authz Check loads about 220 tokens when it runs. Until then it costs about 33 tokens; SKILL.md has 98 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~33
When it runs · the whole SKILL.md, loaded when a task matches
~220

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

The full file from Archive228/loopkit at commit 5ae033e, republished under its MIT licence (© Archive228). 98 words, ~220 tokens.

Download SKILL.mdSave it as .claude/skills/authz-check/SKILL.md (or your agent's skills folder).
name
authz-check
description
Verify that an endpoint checks ownership, not just authentication. Use on any handler that reads or mutates user data.
when_to_use
new/changed endpoint, "get user X's data", a mutation, an admin action

Authz Check

The most common security hole: the code checks you're logged IN, but not that you OWN the thing.

  • For every resource access: does it verify the current user is allowed THIS specific record? WHERE id = ? AND owner_id = current_user — not just WHERE id = ?.
  • IDOR test: swap the ID in the request to another user's. Does it leak/allow?
  • Admin/privileged actions: is the role checked server-side, every time, not just hidden in the UI?
  • Default deny: new endpoints should require explicit authorization, not be open by oversight. Output each handler that authenticates but doesn't authorize, with the missing check.

© Archive228, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/authz-check of Archive228/loopkit.

Open the folder on GitHubat commit 5ae033e

Compare with similar skills

Authz Check 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.

Authz Check compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Authz Check this skillArchive228/loopkit756—~220Automated safety check: PassMIT
Configuring Horizoncoollabsio/coolify63k4 repos~898Automated safety check: PassMIT
K8s Security PoliciesCybereason-Public/owLSM28012 repos~2kAutomated safety check: PassGPL-2.0
Payloadpayloadcms/payload45k5 repos~6.2kAutomated safety check: PassMIT
Convex Setup Authspokvulcan/poker-planning1148 repos~1.8kAutomated safety check: PassMIT
Abp Authorizationabpframework/abp14k—~1.3kAutomated safety check: PassLGPL-3.0

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    coollabsio/coolify

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    63k GitHub starsUsed in 4 repos~898 tokens
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    Comprehensive guide for implementing NetworkPolicy, PodSecurityPolicy, RBAC, and Pod Security Standards in Kubernetes.

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Categories

Questions about Authz Check

What does Authz Check do?

Verify that an endpoint checks ownership, not just authentication. Authz Check is an agent skill from Archive228/loopkit. Verify that an endpoint checks ownership, not just authentication.

When should I use Authz Check?

Authz Check fits situations like: tasks that involve Authorization and RBAC.

How do I install Authz Check in Claude Code?

Run `npx skills add Archive228/loopkit --skill authz-check -a claude-code`. Or copy the skill folder (skills/authz-check in Archive228/loopkit) into .claude/skills/authz-check in your project. Claude Code loads it when a task matches its description.

How do I install Authz Check in Codex?

Run `npx skills add Archive228/loopkit --skill authz-check -a codex`. Or copy the skill folder (skills/authz-check in Archive228/loopkit) into .agents/skills/authz-check in your project. Codex loads it when a task matches its description.

Can I use Authz Check 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 Archive228/loopkit --skill authz-check -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/authz-check, .gemini/skills/authz-check, .github/skills/authz-check and .opencode/skills/authz-check in your project.

What does Authz Check need to run?

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

Does Authz Check 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 Authz Check 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 Authz Check use?

Authz Check is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Authz Check use?

About 220 tokens (SKILL.md is roughly 880 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 Authz Check?

Skills that share tags, products or a category with Authz Check: Configuring Horizon (coollabsio/coolify, 63k stars), K8s Security Policies (Cybereason-Public/owLSM, 280 stars), Payload (payloadcms/payload, 45k stars) and Convex Setup Auth (spokvulcan/poker-planning, 114 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Authz Check?

Archive228 (a GitHub user) maintains it in Archive228/loopkit, which has 756 GitHub stars. The repository holds 43 skills in this directory. The repository was last updated on July 14, 2026.

Source: Archive228/loopkit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.