> Give your TypeScript AI agent a phone number with 4 lines of code. Express-based, fully typed, production-ready. Open source. Canonical URL: https://www.getpatter.com/products/typescript-sdk Site map: https://www.getpatter.com/sitemap.xml · Overview for LLMs: https://www.getpatter.com/llms.txt · Developer resources: https://www.getpatter.com/developers --- Open Source MIT Licensed # TypeScript SDK Give your Node.js AI agent a phone number. Express-based embedded server, full type safety, same API surface as the Python SDK. `npm install getpatter` index.ts 4 lines ```typescript import { Patter, Twilio, OpenAIRealtime } from "getpatter"; const phone = new Patter({ carrier: new Twilio(), phoneNumber: "+15550001234" }); const agent = phone.agent({ engine: new OpenAIRealtime(), systemPrompt: "You are a friendly receptionist." }); await phone.serve({ agent, tunnel: true }); ``` Quick Start ## 4 lines to a phone call - Connect your telephony provider and start handling phone calls - Full TypeScript types for messages, events, and config - Express-based embedded server — no Patter backend needed - Works with any LLM — OpenAI, Anthropic, or your own - Built-in webhook validation for Twilio and Telnyx (Beta) [Getting started guide →](https://docs.getpatter.com) Features ## Everything you need to connect your agent to phone calls ### Type-Safe Config Every option is typed. `LocalConfig`, `AgentConfig`, `IncomingMessage` — autocomplete everywhere. ### Instance-based voice stack End-to-end with `new OpenAIRealtime()` / `new ElevenLabsConvAI()`, or pipeline mode with `new DeepgramSTT()` + `new AnthropicLLM()` + `new ElevenLabsTTS()` — swap any piece. ### Webhook Security Built-in Twilio signature verification and Telnyx (Beta) Ed25519 validation. No Patter backend required. ### System Tools Auto-injected `transfer_call` and `end_call` tools. Define custom tools with webhook URLs. ### Event Lifecycle `onCallStart`, `onCallEnd`, `onTranscript` — hook into every stage of the call. ### Recording One flag to enable call recording. Recordings managed by your telephony provider. ### Output Guardrails Block terms, run custom validators, or replace responses before they reach TTS. ### DTMF & Variables Keypad input as transcript events. Dynamic `{variable}` substitution in system prompts. ## Start building in minutes Install the SDK, write a handler, connect a phone number. [Read the docs →](https://docs.getpatter.com/typescript-sdk/overview)