VizLang - Speedup your Agent Development

Developer Tools

See your LangGraph agents think, right inside VS Code

About

VizLang is a free and open-source visual debugging tool for LangGraph agents, operating under the MIT license. Simply right-click a Python file to activate your agent's graph, where executing nodes illuminate, state updates display on hover, and you can step through each decision as with a line-by-line debugger. Communicate with your agent, manage human interruptions, oversee threads, and examine tool calls entirely within VS Code. The system requires no cloud services, accounts, or API keys, as all processing occurs locally. It is permanently free to use.

Launched

March 28, 2026Week 3

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