VizLang is an open-source visual debugger for LangGraph agents. Right-click any Python file and watch your agent's graph come alivenodes light up as they execute, state changes appear on hover, and you can step through every decision like a line-by-line debugger. Chat with your agent, handle human-in-the-loop interrupts, manage threads, and inspect tool calls all without leaving VS Code. No cloud. No accounts. No API keys. Everything runs locally. Free forever, MIT licensed.
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Maker
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Hey Product Hunt! I built VizLang because I was tired of debugging LangGraph agents with print() statements. You build these complex graphs with conditional branches, tool loops, and human-in-the-loop steps and then you debug by reading terminal output line by line.
VizLang gives you a visual debugger right inside VS Code. Open your Python file, see the graph, click Run, and watch nodes execute in real time. Click Step to pause after each node and inspect the full state. It's like Chrome DevTools, but for AI agents.
It's open source (MIT) and I'd love contributions whether that's bug reports, feature ideas, or code. Check out the GitHub repo and let me know what you think!