auth0-authentication: Security & Code Review for AI Agents | OpenAgentSkill

Overview

Guidelines for implementing Auth0 authentication with best practices for security, rules, actions, and SDK integration

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Auth0 Authentication

You are an expert in Auth0 authentication implementation. Follow these guidelines when working with Auth0 in any project.

Core Principles

Always use HTTPS for all Auth0 communications and callbacks
Store sensitive configuration (client secrets, API keys) in environment variables, never in code
Implement proper error handling for all authentication flows
Follow the principle of least privilege for scopes and permissions

Environment Variables

# Required Auth0 Configuration
AUTH0_DOMAIN=your-tenant.auth0.com
AUTH0_CLIENT_ID=your-client-id
AUTH0_CLIENT_SECRET=your-client-secret
AUTH0_AUDIENCE=your-api-audience
AUTH0_CALLBACK_URL=https://your-app.com/callback
AUTH0_LOGOUT_URL=https://your-app.com

Authentication Flows

Authorization Code Flow with PKCE (Recommended for SPAs and Native Apps)

Always use PKCE for public clients:

import { Auth0Client } from '@auth0/auth0-spa-js';

const auth0 = new Auth0Client({
  domain: process.env.AUTH0_DOMAIN,
  clientId: process.env.AUTH0_CLIENT_ID,
  authorizationParams: {
    redirect_uri: window.location.origin,
    audience: process.env.AUTH0_AUDIENCE,
  },
  cacheLocation: 'localstorage', // Use 'memory' for higher security
  useRefreshTokens: true,
});

Authorization Code Flow (Server-Side Applications)

// Express.js example
const { auth } = require('express-openid-connect');

app.use(
  auth({
    authRequired: false,
    auth0Logout: true,
    secret: process.env.AUTH0_SECRET,
    baseURL: process.env.BASE_URL,
    clientID: process.env.AUTH0_CLIENT_ID,
    issuerBaseURL: `https://${process.env.AUTH0_DOMAIN}`,
  })
);

Auth0 Actions Best Practices

Actions have replaced Rules. Follow these guidelines:

Action Structure

exports.onExecutePostLogin = async (event, api) => {
  // 1. Early returns for efficiency
  if (!event.user.email_verified) {
    api.access.deny('Please verify your email before logging in.');
    return;
  }

  // 2. Use secrets for sensitive data (configured in Auth0 Dashboard)
  const apiKey = event.secrets.EXTERNAL_API_KEY;

  // 3. Minimize external calls - they affect login latency
  // 4. Never log sensitive information
  console.log(`User logged in: ${event.user.user_id}`);

  // 5. Add custom claims sparingly
  api.idToken.setCustomClaim('https://myapp.com/roles', event.authorization?.roles || []);
  api.accessToken.setCustomClaim('https://myapp.com/roles', event.authorization?.roles || []);
};

Action Security Rules

Store secrets in Action Secrets, never hardcode them
Limit the data sent to external services - never send the entire event object
Use short timeouts for external API calls (default 20-second limit)
Implement proper error handling to avoid authentication failures

Token Management

Access Token Best Practices

// Always validate tokens server-side
const { auth, requiredScopes } = require('express-oauth2-jwt-bearer');

const checkJwt = auth({
  audience: process.env.AUTH0_AUDIENCE,
  issuerBaseURL: `https://${process.env.AUTH0_DOMAIN}/`,
  tokenSigningAlg: 'RS256',
});

// Require specific scopes
const checkScopes = requiredScopes('read:messages');

app.get('/api/private-scoped', checkJwt, checkScopes, (req, res) => {
  res.json({ message: 'Protected resource' });
});

Refresh Token Configuration

Enable refresh token rotation
Set appropriate token lifetimes (access tokens: 1 hour max, refresh tokens: based on risk)
Implement automatic token refresh in your client

Security Best Practices

CSRF Protection

// State parameter is automatically handled by Auth0 SDKs
// For custom implementations, always validate the state parameter
const state = generateSecureRandomString();
sessionStorage.setItem('auth0_state', state);

Redirect URI Security

Whitelist all redirect URIs in Auth0 Dashboard
Use exact string matching for redirect URIs
Never use wildcard redirect URIs in production

Session Management

// Implement session timeouts
const sessionConfig = {
  absoluteDuration: 86400, // 24 hours
  inactivityDuration: 3600, // 1 hour of inactivity
};

Multi-Factor Authentication

// Enforce MFA for sensitive operations
exports.onExecutePostLogin = async (event, api) => {
  // Check if MFA has been completed
  if (!event.authentication?.methods?.find(m => m.name === 'mfa')) {
    // Trigger MFA challenge
    api.authentication.challengeWithAny([
      { type: 'otp' },
      { type: 'push-notification' },
    ]);
  }
};

Error Handling

try {
  await auth0.loginWithRedirect();
} catch (error) {
  if (error.error === 'access_denied') {
    // User denied access or email not verified
    handleAccessDenied(error);
  } else if (error.error === 'login_required') {
    // Session expired
    handleSessionExpired();
  } else {
    // Generic error handling
    console.error('Authentication error:', error.message);
    showUserFriendlyError();
  }
}

MCP Integration

Auth0 provides an MCP server for AI-assisted development:

# Initialize Auth0 MCP server for Cursor
npx @auth0/auth0-mcp-server init --client cursor

This enables natural language Auth0 management operations within your IDE.

Testing

Use Auth0's test users for development
Implement integration tests for authentication flows
Test token expiration and refresh scenarios
Verify MFA flows in staging environments

Common Anti-Patterns to Avoid

Storing tokens in localStorage without considering XSS risks
Not validating tokens on the server side
Using the implicit flow (deprecated)
Hardcoding client secrets in frontend code
Not implementing proper logout (both local and Auth0 session)
Ignoring token expiration in API calls
Storing too much data in user metadata

View source ↗

File metadata

name: auth0-authentication
description: Guidelines for implementing Auth0 authentication with best practices for security, rules, actions, and SDK integration

View original text

---
name: auth0-authentication
description: Guidelines for implementing Auth0 authentication with best practices for security, rules, actions, and SDK integration
---

# Auth0 Authentication

You are an expert in Auth0 authentication implementation. Follow these guidelines when working with Auth0 in any project.

## Core Principles

- Always use HTTPS for all Auth0 communications and callbacks
- Store sensitive configuration (client secrets, API keys) in environment variables, never in code
- Implement proper error handling for all authentication flows
- Follow the principle of least privilege for scopes and permissions

## Environment Variables

```bash
# Required Auth0 Configuration
AUTH0_DOMAIN=your-tenant.auth0.com
AUTH0_CLIENT_ID=your-client-id
AUTH0_CLIENT_SECRET=your-client-secret
AUTH0_AUDIENCE=your-api-audience
AUTH0_CALLBACK_URL=https://your-app.com/callback
AUTH0_LOGOUT_URL=https://your-app.com
```

## Authentication Flows

### Authorization Code Flow with PKCE (Recommended for SPAs and Native Apps)

Always use PKCE for public clients:

```javascript
import { Auth0Client } from '@auth0/auth0-spa-js';

const auth0 = new Auth0Client({
  domain: process.env.AUTH0_DOMAIN,
  clientId: process.env.AUTH0_CLIENT_ID,
  authorizationParams: {
    redirect_uri: window.location.origin,
    audience: process.env.AUTH0_AUDIENCE,
  },
  cacheLocation: 'localstorage', // Use 'memory' for higher security
  useRefreshTokens: true,
});
```

### Authorization Code Flow (Server-Side Applications)

```javascript
// Express.js example
const { auth } = require('express-openid-connect');

app.use(
  auth({
    authRequired: false,
    auth0Logout: true,
    secret: process.env.AUTH0_SECRET,
    baseURL: process.env.BASE_URL,
    clientID: process.env.AUTH0_CLIENT_ID,
    issuerBaseURL: `https://${process.env.AUTH0_DOMAIN}`,
  })
);
```

## Auth0 Actions Best Practices

Actions have replaced Rules. Follow these guidelines:

### Action Structure

```javascript
exports.onExecutePostLogin = async (event, api) => {
  // 1. Early returns for efficiency
  if (!event.user.email_verified) {
    api.access.deny('Please verify your email before logging in.');
    return;
  }

  // 2. Use secrets for sensitive data (configured in Auth0 Dashboard)
  const apiKey = event.secrets.EXTERNAL_API_KEY;

  // 3. Minimize external calls - they affect login latency
  // 4. Never log sensitive information
  console.log(`User logged in: ${event.user.user_id}`);

  // 5. Add custom claims sparingly
  api.idToken.setCustomClaim('https://myapp.com/roles', event.authorization?.roles || []);
  api.accessToken.setCustomClaim('https://myapp.com/roles', event.authorization?.roles || []);
};
```

### Action Security Rules

- Store secrets in Action Secrets, never hardcode them
- Limit the data sent to external services - never send the entire event object
- Use short timeouts for external API calls (default 20-second limit)
- Implement proper error handling to avoid authentication failures

## Token Management

### Access Token Best Practices

```javascript
// Always validate tokens server-side
const { auth, requiredScopes } = require('express-oauth2-jwt-bearer');

const checkJwt = auth({
  audience: process.env.AUTH0_AUDIENCE,
  issuerBaseURL: `https://${process.env.AUTH0_DOMAIN}/`,
  tokenSigningAlg: 'RS256',
});

// Require specific scopes
const checkScopes = requiredScopes('read:messages');

app.get('/api/private-scoped', checkJwt, checkScopes, (req, res) => {
  res.json({ message: 'Protected resource' });
});
```

### Refresh Token Configuration

- Enable refresh token rotation
- Set appropriate token lifetimes (access tokens: 1 hour max, refresh tokens: based on risk)
- Implement automatic token refresh in your client

## Security Best Practices

### CSRF Protection

```javascript
// State parameter is automatically handled by Auth0 SDKs
// For custom implementations, always validate the state parameter
const state = generateSecureRandomString();
sessionStorage.setItem('auth0_state', state);
```

### Redirect URI Security

- Whitelist all redirect URIs in Auth0 Dashboard
- Use exact string matching for redirect URIs
- Never use wildcard redirect URIs in production

### Session Management

```javascript
// Implement session timeouts
const sessionConfig = {
  absoluteDuration: 86400, // 24 hours
  inactivityDuration: 3600, // 1 hour of inactivity
};
```

## Multi-Factor Authentication

```javascript
// Enforce MFA for sensitive operations
exports.onExecutePostLogin = async (event, api) => {
  // Check if MFA has been completed
  if (!event.authentication?.methods?.find(m => m.name === 'mfa')) {
    // Trigger MFA challenge
    api.authentication.challengeWithAny([
      { type: 'otp' },
      { type: 'push-notification' },
    ]);
  }
};
```

## Error Handling

```javascript
try {
  await auth0.loginWithRedirect();
} catch (error) {
  if (error.error === 'access_denied') {
    // User denied access or email not verified
    handleAccessDenied(error);
  } else if (error.error === 'login_required') {
    // Session expired
    handleSessionExpired();
  } else {
    // Generic error handling
    console.error('Authentication error:', error.message);
    showUserFriendlyError();
  }
}
```

## MCP Integration

Auth0 provides an MCP server for AI-assisted development:

```bash
# Initialize Auth0 MCP server for Cursor
npx @auth0/auth0-mcp-server init --client cursor
```

This enables natural language Auth0 management operations within your IDE.

## Testing

- Use Auth0's test users for development
- Implement integration tests for authentication flows
- Test token expiration and refresh scenarios
- Verify MFA flows in staging environments

## Common Anti-Patterns to Avoid

1. Storing tokens in localStorage without considering XSS risks
2. Not validating tokens on the server side
3. Using the implicit flow (deprecated)
4. Hardcoding client secrets in frontend code
5. Not implementing proper logout (both local and Auth0 session)
6. Ignoring token expiration in API calls
7. Storing too much data in user metadata

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: Apache-2.0

Dependency or permission surface needs review
Permission surface may require sandboxing
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Stars/forks activity: 256 stars, 38 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Open full audit

Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.

Start with one small task

1Read the source. Confirm the input, expected output, dependencies and permissions.
2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.
3Check the output and changed files. Report only what actually ran; keep the source revision for reproduction.

Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.

Source & usage notes

Indexed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: Mindrally/skills
License: Apache-2.0
Version: 1.0.0
Last GitHub push: Sep 3, 2026
Registry updated: Sep 4, 2026
Instruction path: auth0-authentication/SKILL.md @ 97184105b5da

Version reported in registry metadata; check source releases before relying on it.

Quality

71/100

Strong

Trust

66/100

Sandbox only

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/mindrally-auth0-authentication",
    "api": "https://www.openagentskill.com/api/agent/skills/mindrally-auth0-authentication",
    "audit": "https://www.openagentskill.com/skills/mindrally-auth0-authentication/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=mindrally-auth0-authentication&task=Use%20auth0-authentication%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20auth0-authentication%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20auth0-authentication%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/mindrally-auth0-authentication/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/mindrally-auth0-authentication"
  }
}

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Creator: Mindrally
Source: Mindrally/skills
Indexed by: OpenAgentSkill community index

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[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/mindrally-auth0-authentication?metric=listed&label=Listed)](https://www.openagentskill.com/skills/mindrally-auth0-authentication?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/mindrally-auth0-authentication?metric=trust&label=Trust)](https://www.openagentskill.com/skills/mindrally-auth0-authentication?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/mindrally-auth0-authentication?metric=audit&label=Audit)](https://www.openagentskill.com/skills/mindrally-auth0-authentication/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/mindrally-auth0-authentication?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/mindrally-auth0-authentication?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

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