Agents
@hwchase17 @LangChain I built an open-source CLI that scaffolds, runs, and deploys production LangChain agents — frontend and backend in one…
@hwchase17 @LangChain I built an open-source CLI that scaffolds, runs, and deploys production LangChain agents — frontend and backend in one command. Every agent project starts the same way: wire up a
@hwchase17 @LangChain I built an open-source CLI that scaffolds, runs, and deploys production LangChain agents — frontend and backend in one command. Every agent project starts the same way: wire up a LangGraph backend, scaffold a Next.js frontend, figure out CORS, hide API keys, set up a proxy. Two days gone before you write a single line of agent logic. langctl kills that. langctl new my-agent cd my-agent langctl dev That's it. Agent + chat UI running at localhost:3000. One URL. No CORS. No exposed keys. How it actually works: langctl new scaffolds a LangGraph Agent Server backend and a Next.js frontend, wired together through a built-in proxy. The browser only ever talks to /api/agent/* on the frontend's origin — the proxy attaches x-api-key server-side. Zero cross-origin requests, ever. langctl dev starts both processes, waits for the agent's health endpoint before booting the UI, and tears everything down cleanly on Ctrl-C. Like next dev, but the backend is an agent. Three chat UI options out of the box: assistant-ui (default) — threads, branching, composer runtime minimal — one hand-written Chat.tsx, zero UI deps ai-elements — shadcn-registry components (experimental) Other commands: langctl sync — regenerates langgraph.json from agent.yaml, preserves hand-written keys langctl doctor — verifies toolchain, ports, keys, and config before something breaks agent.yaml is your single source of truth. Dev and production differ by one env variable. The frontend source doesn't change. Phase 1 (scaffold + unified dev runtime) is live on PyPI. Deploy providers (LangSmith Cloud, Vercel) are next. Apache-2.0 licensed. Generated projects carry no license obligation to this tool. GitHub: https://lnkd.in/dcTqBPkE PyPI: http://pypi.org/project/langctl pip install langctl and build your next agent in minutes, not days. LangChain Langchain Community for Developers, India LangChain JS LangChain Developer LangChain Labs Formation LangChain FranceLangchain #OpenSource #LangChain #LangGraph #AIAgents #Python #DeveloperTools #CLI #FastAPI #NextJS
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Source: Harrison Chase (X) | 2026-08-15