21st Agents SDK
Add production-ready AI agents to applications with minimal infrastructure setup
21st
3/18/2026
AI Agents & Automation
AI-ecosystem
Provides infrastructure for deploying and managing AI agents in production
21st Agents SDK is an open-source development platform that provides infrastructure for adding AI agents to applications. It offers sandboxed execution environments, streaming capabilities, built-in tools, UI components, and monitoring features. The platform handles runtime management, permissions, cost tracking, and deployment while allowing developers to focus on agent configuration and integration.
Value Propositions
Features
E2B sandboxed executionSSE streaming with AI SDK compatibilityBuilt-in tools for web search and file handlingSkills system for on-demand contextTheme presets and custom stylingPer-dialog cost tracking