retellai-security-basics skill

---
name: retellai-security-basics
description: |
  Apply Retell AI security best practices for secrets and access control.
  Use when securing API keys, implementing least privilege access,
  or auditing Retell AI security configuration.
  Trigger with phrases like "retellai security", "retellai secrets",
  "secure retellai", "retellai API key security".
allowed-tools: Read, Write, Grep
version: 1.0.0
license: MIT
author: Jeremy Longshore <[email protected]>
---

# Retell AI Security Basics

## Overview
Security best practices for Retell AI API keys, tokens, and access control.

## Prerequisites
- Retell AI SDK installed
- Understanding of environment variables
- Access to Retell AI dashboard

## Instructions

### Step 1: Configure Environment Variables
```bash
# .env (NEVER commit to git)
RETELLAI_API_KEY=sk_live_***
RETELLAI_SECRET=***

# .gitignore
.env
.env.local
.env.*.local
```

### Step 2: Implement Secret Rotation
```bash
# 1. Generate new key in Retell AI dashboard
# 2. Update environment variable
export RETELLAI_API_KEY="new_key_here"

# 3. Verify new key works
curl -H "Authorization: Bearer ${RETELLAI_API_KEY}" \
  https://api.retellai.com/health

# 4. Revoke old key in dashboard
```

### Step 3: Apply Least Privilege
| Environment | Recommended Scopes |
|-------------|-------------------|
| Development | `read:*` |
| Staging | `read:*, write:limited` |
| Production | `Only required scopes` |

## Output
- Secure API key storage
- Environment-specific access controls
- Audit logging enabled

## Error Handling
| Security Issue | Detection | Mitigation |
|----------------|-----------|------------|
| Exposed API key | Git scanning | Rotate immediately |
| Excessive scopes | Audit logs | Reduce permissions |
| Missing rotation | Key age check | Schedule rotation |

## Examples

### Service Account Pattern
```typescript
const clients = {
  reader: new RetellAIClient({
    apiKey: process.env.RETELLAI_READ_KEY,
  }),
  writer: new RetellAIClient({
    apiKey: process.env.RETELLAI_WRITE_KEY,
  }),
};
```

### Webhook Signature Verification
```typescript
import crypto from 'crypto';

function verifyWebhookSignature(
  payload: string, signature: string, secret: string
): boolean {
  const expected = crypto.createHmac('sha256', secret).update(payload).digest('hex');
  return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected));
}
```

### Security Checklist
- [ ] API keys in environment variables
- [ ] `.env` files in `.gitignore`
- [ ] Different keys for dev/staging/prod
- [ ] Minimal scopes per environment
- [ ] Webhook signatures validated
- [ ] Audit logging enabled

### Audit Logging
```typescript
interface AuditEntry {
  timestamp: Date;
  action: string;
  userId: string;
  resource: string;
  result: 'success' | 'failure';
  metadata?: Record<string, any>;
}

async function auditLog(entry: Omit<AuditEntry, 'timestamp'>): Promise<void> {
  const log: AuditEntry = { ...entry, timestamp: new Date() };

  // Log to Retell AI analytics
  await retellaiClient.track('audit', log);

  // Also log locally for compliance
  console.log('[AUDIT]', JSON.stringify(log));
}

// Usage
await auditLog({
  action: 'retellai.api.call',
  userId: currentUser.id,
  resource: '/v1/resource',
  result: 'success',
});
```

## Resources
- [Retell AI Security Guide](https://docs.retellai.com/security)
- [Retell AI API Scopes](https://docs.retellai.com/scopes)

## Next Steps
For production deployment, see `retellai-prod-checklist`.