Authentication bugs are rarely in the cryptography; they are in the flow: a reset link that does not expire, a redirect URI matched by prefix, a login that tells you which e-mails exist, a session that survives a password change. This skill walks every flow against the checklist in [references/checklist.md](references/checklist.md), with the reference flows in [references/flows.md](references/flows.md), and reports what to change.
Auth Flow Review is a community-contributed Claude Code skill in the identity-access sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/auth-flow-review/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when asked \"is our login flow secure?\", when designing or reviewing authentication, integrating an identity provider, or after an account takeover. Not for in-app authorization rules beyond noting where they belong, or for implementing cryptography.
The Auth Flow Review Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 211,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/auth-flow-review curl -L https://claudskills.com/skills/auth-flow-review/SKILL.md \ -o ~/.claude/skills/auth-flow-review/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/auth-flow-review/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/auth-flow-review/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\auth-flow-review\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/auth-flow-review/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Auth Flow Review is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{auth-flow-review-2026,
author = {basitalisandhu},
title = {Auth Flow Review [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/auth-flow-review/}
}Grade A · scanned 2026-10-25 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.