---

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

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
• retell-sdk npm

Next Steps

See related Retell AI skills for more workflows.