Skills for Real Engineers. Straight from my .agents directory.
auth-sec
Agent skill fromyaklang/hack-skills
Entry P1 category router for authentication and authorization. Use when testing login flows, sessions, object authorization, JWT, OAuth, CORS, CSRF, and enterprise SSO weaknesses before any deeper auth topic skill.
How to install auth-sec
npx skills add yaklang/hack-skills# or add only this skill to Claude Code: copy the folder
skills/auth-sec/
# into
~/.claude/skills/auth-sec/ (all projects)
.claude/skills/auth-sec/ (one project)
1# Authentication and Authorization Router23This is the routing entry point for authentication, sessions, and authorization boundaries.45Use it to decide whether the issue is mainly login mechanics, object-level authorization, browser trust boundaries, or identity protocols such as OAuth/JWT/SAML before going deeper.67## When to Use89- The target includes login, registration, password reset, 2FA, sessions, JWT, OAuth, or SSO10- You suspect object authorization flaws, cross-tenant access, cross-origin reads, CSRF, or protocol misconfiguration11- You need to decide whether to test authentication or authorization first1213## Skill Map1415- [Authentication Bypass](../authbypass-authentication-flaws/SKILL.md): login bypass, password reset, 2FA, enumeration, brute-force protections16- [IDOR Broken Object Authorization](../idor-broken-object-authorization/SKILL.md): IDOR, BOLA, BFLA, missing object permissions17- [JWT OAuth Token Attacks](../jwt-oauth-token-attacks/SKILL.md): algorithm confusion, key trust issues, claim abuse, token forgery18- [OAuth OIDC Misconfiguration](../oauth-oidc-misconfiguration/SKILL.md): redirect URI, state, nonce, PKCE, account binding19- [CSRF Cross Site Request Forgery](../csrf-cross-site-request-forgery/SKILL.md): CSRF tokens, SameSite, JSON CSRF, login CSRF20- [CORS Cross Origin Misconfiguration](../cors-cross-origin-misconfiguration/SKILL.md): reflected Origin, credentialed cross-origin reads, allowlist bypass21…
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