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.
21st Agents SDK
SDK to add an Claude Code AI agent to your app

21st Agents SDK Introduction
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PricingPaid
Platform
Web
Category DescriptionDiscover workflow automation, task orchestration, cross-app integration, and efficiency tools to reduce repetitive work.
Listed DateMar 12, 2026
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