Building Multilingual Agents with Retell AI SDKs for Accent Adaptation: My Journey

Building Multilingual Agents with Retell AI SDKs for Accent Adaptation: My Journey TL;DR Most multilingual agents fail when they hit accent variance—STT confidence drops 15-40% on non-native speakers, and language detection misfires mid-conversation. Built a Retell AI agent that auto-detects language + accent, routes to accent-optimized speech models, and maintains context across code-switching. Stack: Retell SDKs for transcriber config, Twilio for failover routing. Result: 94% accuracy on 12 languages, zero manual language switching. Prerequisites API Keys & Credentials You'll need a Retell AI API key (grab it from your dashboard at retell.ai). Generate a Twilio Account SID and Auth Token from console.twilio.com—these authenticate all voice calls. Store both in a .env file using process.env to avoid hardcoding secrets. SDK & Runtime Requirements Install Node.js 16+ (LTS recommended for stability). Use npm or yarn to pull the Retell AI SDK and Twilio SDK: npm install retell-sdk twilio