auth0-mfa
Use when adding MFA or step-up authentication to an app — requiring users to verify with a second factor (TOTP, SMS, passkey, push) for login or before a sensitive action. Also use for adaptive/risk-based MFA or compliance requirements like HIPAA or PCI-DSS, even if the user just says "add two-factor auth" or "require MFA before this action".
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/auth0/agent-skills --skill auth0-mfa- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads auth0-mfa automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Auth0 MFA Guide
Add Multi-Factor Authentication to protect user accounts and require additional verification for sensitive operations.
Overview
What is MFA?
Multi-Factor Authentication (MFA) requires users to provide two or more verification factors to access their accounts. Auth0 supports multiple MFA factors and enables step-up authentication for sensitive operations.
When to Use This Skill
- Adding MFA to protect user accounts
- Requiring additional verification for sensitive actions (payments, settings changes)
- Implementing adaptive/risk-based authentication
- Meeting compliance requirements (PCI-DSS, SOC2, HIPAA)
MFA Factors Supported
| Factor | Type | Description |
|---|---|---|
| TOTP | Something you have | Time-based one-time passwords (Google Authenticator, Authy) |
| SMS | Something you have | One-time codes via text message |
| Something you have | One-time codes via email | |
| Push | Something you have | Push notifications via Auth0 Guardian app |
| WebAuthn | Something you have/are | Security keys, biometrics, passkeys |
| Voice | Something you have | One-time codes via phone call |
| Recovery Code | Backup | One-time use recovery codes |
Key Concepts
| Concept | Description |
|---|---|
acr_values | Request MFA during authentication |
amr claim | Authentication Methods Reference - indicates how user authenticated |
| Step-up auth | Require MFA for specific actions after initial login |
| Adaptive MFA | Conditionally require MFA based on risk signals |
Step 1: Enable MFA in Tenant
Via Auth0 Dashboard
- Go to Security → Multi-factor Auth
- Enable desired factors (TOTP, SMS, etc.)
- Configure Policies:
- Always - Require MFA for all logins
- Adaptive - Risk-based MFA
- Never - Disable MFA (use step-up instead)
Via Auth0 CLI
# View current MFA configuration
auth0 api get "guardian/factors"
# Enable TOTP (One-time Password)
auth0 api put "guardian/factors/otp" --data '{"enabled": true}'
# Enable SMS
auth0 api put "guardian/factors/sms" --data '{"enabled": true}'
# Enable Push notifications
auth0 api put "guardian/factors/push-notification" --data '{"enabled": true}'
# Enable WebAuthn (Roaming - Security Keys)
auth0 api put "guardian/factors/webauthn-roaming" --data '{"enabled": true}'
# Enable WebAuthn (Platform - Biometrics)
auth0 api put "guardian/factors/webauthn-platform" --data '{"enabled": true}'
# Enable Email
auth0 api put "guardian/factors/email" --data '{"enabled": true}'
Configure MFA Policy
# Set MFA policy: "all-applications" or "confidence-score"
auth0 api patch "guardian/policies" --data '["all-applications"]'
Step 2: Implement Step-Up Authentication
Step-up auth requires MFA for sensitive operations without requiring it for every login.
The acr_values Parameter
Request MFA by including acr_values in your authorization request:
acr_values=http://schemas.openid.net/pape/policies/2007/06/multi-factor
Implementation Pattern
The general pattern for all frameworks:
- Check if user has already completed MFA (inspect
amrclaim) - If not, request MFA via
acr_valuesparameter - Proceed with sensitive action once MFA is verified
For complete framework-specific examples, see Examples Guide:
- React (basic and custom hook)
- Next.js (App Router)
- Vue.js
- Angular
Additional Resources
This skill is split into multiple files for better organization:
Step-Up Examples
Complete code examples for all frameworks:
- React (basic and custom hook patterns)
- Next.js (App Router with API routes)
- Vue.js (composition API)
- Angular (services and components)
Backend Validation
Learn how to validate MFA status on your backend:
- Node.js / Express JWT validation
- Python / Flask validation
- Middleware examples
Advanced Topics
Advanced MFA implementation patterns:
- Adaptive MFA with Auth0 Actions
- Conditional MFA based on risk signals
- MFA Enrollment API
Reference Guide
Common patterns and troubleshooting:
- Remember MFA for 30 days
- MFA for high-value transactions
- MFA status display
- Error handling
- AMR claim values
- Testing strategies
- Security considerations
Related Skills
auth0-quickstart- Basic Auth0 setupauth0-passkeys- WebAuthn/passkey implementationauth0-actions- Custom authentication logic
References
FAQ
What does the auth0-mfa skill do?
Use when adding MFA or step-up authentication to an app — requiring users to verify with a second factor (TOTP, SMS, passkey, push) for login or before a sensitive action. Also use for adaptive/risk-based MFA or compliance requirements like HIPAA or PCI-DSS, even if the user just says "add two-factor auth" or "require MFA before this action".
How do I install auth0-mfa?
Run npx skills add https://github.com/auth0/agent-skills --skill auth0-mfa in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/auth0-mfa/ (personal) or .claude/skills/auth0-mfa/ (project).
Which AI agents can use auth0-mfa?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is auth0-mfa safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains auth0-mfa?
It is published by auth0 in auth0/agent-skills, and it is an official skill from the maker of the technology it covers. It has 811 recorded installs.
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