Ship agents to production.
Infrastructure for CLI-based AI agents. Sandboxing, auth, UI, and observability — out of the box.
Building an agent takes a weekend.
Running it in production takes months.
Without 21st
Weeks of infra work
With 21st
npx @21st-sdk/cli deploy— done.Platform
Everything you need to run agents in production.
Sandboxed Runtimes
Every agent session runs in an isolated E2B sandbox with gVisor. Boots in seconds, not minutes.
Credential Management
API keys, env vars, secrets — injected securely at runtime. Token exchange auth for browser clients.
Agent UI
Drop-in React components for chat, streaming, and tool rendering. Works with Next.js out of the box.
Observability
Every step traced. Cost per session, latency, errors, token usage — one dashboard.
How it works
Three steps. Zero infra.
Define
Write your agent in TypeScript. Add tools with Zod schemas. Configure model, system prompt, and MCP servers.
Deploy
npx @21st-sdk/cli deploy pushes your agent to a sandboxed, production-grade environment.
Integrate
Every agent gets an API endpoint. Embed the React chat UI, or connect via the server SDK.
Code
Code-first. TypeScript all the way.
Templates
Start from a working agent.
Pricing
Start free. Scale when you need to.
Usage
Pay as you go
For developers shipping their first agents.
- ✓Unlimited agents
- ✓E2B sandboxed runtimes with gVisor
- ✓Built-in token exchange auth
- ✓AgentChat React components
- ✓Observability & tracing dashboard
- ✓Environment variables & secrets
- ✓Claude Code runtime
- ✓Community Discord support
Scale
Custom
For teams running agents on their own infrastructure.
- ✓Everything in Usage, plus:
- ✓On-premise deploy in your VPC
- ✓SSO & Okta (SAML, OIDC)
- ✓Immutable audit logs
- ✓Budget caps per agent & workflow
- ✓Full run replay with cost breakdown
- ✓Custom sandbox specs (CPU, RAM, disk)
- ✓Dedicated support & SLA