---
name: retellai-reliability-patterns
description: "Retell AI reliability patterns \u2014 AI voice agent and phone call\
  \ automation.\nUse when working with Retell AI for voice agents, phone calls, or\
  \ telephony.\nTrigger with phrases like \"retell reliability patterns\", \"retellai-reliability-patterns\"\
  , \"voice agent\".\n"
allowed-tools: Read, Write, Edit, Bash(npm:*), Bash(curl:*), Grep
version: 1.9.0
license: MIT
author: Jeremy Longshore <jeremy@intentsolutions.io>
tags:
- saas
- retellai
- voice
- telephony
- ai-agents
compatibility: Designed for Claude Code
---
# Retell AI Reliability Patterns

## Overview

Implementation patterns for Retell AI reliability patterns — voice agent and telephony platform.

## Prerequisites

- Completed `retellai-install-auth` setup

## Instructions

### Step 1: SDK Pattern

```typescript
import Retell from 'retell-sdk';
const retell = new Retell({ apiKey: process.env.RETELL_API_KEY! });

const agents = await retell.agent.list();
console.log(`Agents: ${agents.length}`);
```

## Output

- Retell AI integration for reliability patterns

## Error Handling

| Error | Cause | Solution |
|-------|-------|----------|
| 401 Unauthorized | Invalid API key | Check RETELL_API_KEY |
| 429 Rate Limited | Too many requests | Implement backoff |
| 400 Bad Request | Invalid parameters | Check API documentation |

## Examples

### Design a safe fallback for a dependent CRM outage

Give the voice flow a short, explicit timeout for CRM lookup and a fallback
response that either schedules a follow-up or transfers to a human queue. Test
the fallback by making the preview CRM endpoint return a controlled error, then
confirm no call is retried or double-booked. Track the fallback rate separately
from general call failures and remove the temporary routing change only after
the dependency and a synthetic recovery call both succeed.

## Resources

- [Retell AI Documentation](https://docs.retellai.com)
- [retell-sdk npm](https://www.npmjs.com/package/retell-sdk)

## Next Steps

See related Retell AI skills for more workflows.