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authz-check

Verify that an endpoint checks ownership, not just authentication.

Skill by Archive228

IndexedMIT★ 755
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Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install skill/archive228-authz-check

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About

Verify that an endpoint checks ownership, not just authentication. Use on any handler that reads or mutates user data.

Use cases: data

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Permissions

What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

Tools
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Secrets
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Install scripts
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Network hosts it talks to 1

  • codeload.github.com · found in install command

Files it touches

  • ~/.claude/skills/authz-check

What's inside

Skill name
authz-check
Description
Verify that an endpoint checks ownership, not just authentication. Use on any handler that reads or mutates user data.
License
MIT
Instructions
8 lines in SKILL.md · view on GitHub

Files (1)

  • SKILL.md

SKILL.md (first lines)

# 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.

From Archive228/loopkit, MIT.

More from Archive228/loopkit

Signals

Stars
755
Forks
124
Open issues
0
Last commit (this folder)
Jun 29, 2026 (4 months ago)

From GitHub (fetched Oct 24, 2026).

Details

License
MIT
Repository
github.com/Archive228/loopkit
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
GitHubgithub-graphql

More from Archive228

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authz-check skill. Agent Mart. https://agentmart.dev/skills/archive228-authz-check (last updated 2026-10-24)