serafim

21st Agents is now in Public Beta. The infra layer to ship Claude Code & Codex agents inside your product. In minutes. Comment for free credits to try 🧵

21st was just named one of the top DevTech startups in W26 by The Silicon Valley Post

More resources to help you get the most out of the SDK: Source Code: github.com/21st-dev/21st-… Example: github.com/21st-dev/21st-… Docs: 21st.dev/agents/docs/ge…

4️⃣ Need to call the agent from the browser? Issue a short-lived token on your server.

The official 21st SDK for Go is here! Manage AI agent sandboxes, threads, and tokens — straight from your Go backend. Here’s how to get started 🧵

→ Template → 21st.dev/agents/docs/te… → AgentMail → agentmail.to → 21st SDK → 21st.dev/agents/docs

Email is still where deals close and leads go cold. Most teams aren't automating it because the setup is annoying. Now it's not.

@21st_dev × @agentmail New template to build Claude-powered agents with real email access - out of the box.

Excited to invest in 21st @21stdev. Outlier founders building infrastructure for AI agents.

@ycombinator @21stdev @sergeybunas @21st_dev

21st (@21stdev) is the production layer for frontier AI agents. 1.4M developers already use their platform to build AI apps, 15K+ GitHub stars - now they're making it dead simple to deploy Claude Code, Codex, and other agents to production. Congrats on the launch, @sergeybunas & @serafimcloud! ycombinator.com/launches/PiD-2…

@rahil1202 @21st_dev That’s all from our free community. Our magic chat, which was supposed to be a revenue stream for creators, doesn’t earn any revenue 🫠

Crazy stats on @21st_dev @serafimcloud Would like to have that monetization feature back on it. 21st.dev/community/rahi…

Omou

@arlanr @21st_dev Gonna be huge

Nia now integrates with @21st_dev (YC W26): chat with any GitHub repo using 21st Agents SDK. Index a repo, spin up a sandboxed agent, and get answers grounded in the full codebase.