Individual skill

auth-pro

Implement web authentication: sessions, OAuth/OIDC, MFA, passwordless, and session security. Use when adding login and access control to apps.

skills/auth-pro/SKILL.md

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# Auth Pro

A practical guide to web authentication done safely: session management, OAuth 2.0/OIDC social login, MFA, passwordless (passkeys/magic links), and the session-security details that prevent account takeovers.

## Overview

Authentication answers "who are you?"; authorization answers "what can you do?" — don't conflate them. The modern default: **delegate to proven providers/libraries** (auth services or maintained libraries) rather than hand-rolling crypto, token logic, or password storage. Custom auth code is where breaches are born.

## When to use

- Adding login/signup to any web app.
- Social login (Google, GitHub, Apple) via OAuth/OIDC.
- MFA, passkeys, magic links.
- Session management and "remember me".
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