21st Agents SDK

SDK to add an Claude Code AI agent to your app

#Automation #Artificial Intelligence #Developer Tools

21st Agents SDK Introduction

The 21st Agents SDK is a developer toolkit for integrating AI agents, specifically Claude Code AI, into applications with minimal setup. It enables defining agents in TypeScript, deploying with a single command, and includes a production-ready chat UI with features like streaming, session management, billing, and observability. This allows developers to focus on custom agent logic rather than backend infrastructure, backed by Y Combinator support.

Key Features

TypeScript-based agent configuration for easy development
One-command deployment for rapid production integration
Sandboxed execution environment with tools for file editing and shell commands
Built-in streaming, session management, and observability for scalable deployments

Use Cases

Developers building coding assistants into IDEs or development tools
Startups creating AI-powered customer support chatbots for apps
Platforms requiring AI agents for automated task execution and user interaction

Why Startups Use It

Startups need this tool to quickly integrate AI capabilities without investing in complex infrastructure, reducing development time and costs. It scales seamlessly with built-in billing and observability, allowing teams to focus on innovation and differentiation, supported by Y Combinator's credibility.

Alternative Options

OpenAI API, Anthropic Claude API, Azure AI Services, Hugging Face Transformers

Frequently Asked Questions

What AI runtimes and models are supported by the SDK?

The SDK supports Anthropic's Claude Code runtime with models like Sonnet 4.6 and Opus 4.6, as well as OpenAI's Codex runtime with various models, enabling flexibility for different use cases.

How do I deploy an agent using this SDK?

After defining your agent in TypeScript, log in with your API key from the dashboard and deploy using CLI commands such as `npx @an-sdk/cli deploy`, streamlining the setup process.

What tools can AI agents utilize within the sandboxed environment?

Agents can access tools for reading and editing files, executing shell commands, and performing web searches or fetches, with permissions to control automatic or user-confirmed actions.

Does the SDK handle billing and session management?

Yes, it includes built-in usage billing, session management, and observability features, making it production-ready without requiring additional infrastructure setup.