StateLens gives you a visual debugger for LangGraph executions. Inspect every node, state transition, tool call, and prompt — without reading logs.
Visualize every node in your LangGraph as an interactive graph. See the full execution flow at a glance.
See exactly how long each node took. Spot bottlenecks and understand execution order.
Diff state before and after each node. Understand exactly how state evolves through execution.
Inspect every tool call input and output. Debug external API calls and function invocations.
See the exact prompt sent to every LLM. Understand why your model produced a given response.
One line of code: observe(graph). No decorators, no logging, no configuration files.