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langplay 发布可视化工具，无需写代码搭建 LangChain 与 LangGraph 工作流
DnD-World/langplay
AI 导读
langplay 是一个可视化学习与搭建 LangChain、LangGraph 工作流的开源项目，用户以积木方式堆叠 prompt、AI、工具、文档、router、critic 等步骤，或画成带分支和循环的图，无需写代码。
正文
Learn LangChain and LangGraph without writing code: build an AI workflow from blocks, run it on a free AI, see every step, then ship it as your own tool.
The problem
LangChain and LangGraph tutorials start with Python, API keys and a notebook. Beginners never get to see what a chain, a tool call, a router or a loop actually does — and when they finally build something, it stays stuck in a notebook.
What it does
- Build visually. Stack steps (prompt, AI, tool, documents, router, critic, final answer) as a list or draw them as a graph with branches and loops.
- Run on real AI for free. Free services by default, a 2-minute guide to free keys (Gemini, Groq, OpenRouter), or any OpenAI-compatible service. An offline practice mode if nothing answers.
- See everything. Click any step to read the exact prompt sent, the answer, the router's choice, the critic's verdict, sources, time, tokens and cost.
- Real tools, no keys. Wikipedia, web answers, an exact calculator, the clock — and search your own PDFs, read inside your browser.
- Learn by doing. 12 auto-checked lessons, from your first chain to a critic loop, with XP and ranks.
- Compare. Same question through two models or two recipes, side by side.
- Spin it out. Turn a recipe into a tool page, a website widget, one HTML file, LangGraph Python, a Claude skill, an n8n workflow, or an MCP tool Claude can call.
Quick start
bun install
bun run dev:local # http://localhost:20136Live: https://langplay.stravelakis.com · In-app docs: /docs · Full setup: INSTALL.md · Full manual: GUIDE.md
Screenshots
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Status
- Works: everything above; 58 automated tests; spin-outs verified end to end (LangGraph 1.2, n8n, MCP over stdio, Cloudflare Worker locally).
- Limits: free keyless AI services allow only a few requests (Pollinations asks for payment after a few; OVHcloud ~2 a minute) — a free key is the reliable path. Progress, recipes and documents live in the browser only; no accounts.
- Next: see HANDOFF.md.
Contributing
Issues and PRs welcome. Please read the Code of Conduct. Security problems: see SECURITY.md.
License
来源：GitHub · github.com