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LangGraph editionClaude Code edition

Agent constellation

LangGraph.js agents running in your browser, traced in LangSmith's run format

Threads
0
Agents
0
Tool calls
0
Tokens
0
Est. cost
$0.00
Simulation Scripted decisions · simulated tools · traces stay in this page

LangGraph runtime

LangGraph.js · in your browser

Scripted model: replays a plan, no model API is called

Waiting for the first superstep

How to read the sky
  • Orchestrator: the thread's root graph. Grows brighter with tokens used.
  • Specialist: a subgraph (Researcher, Financial Analyst…), linked to the graph that sent it work
  • You
  • Code and SQL Retrieval Writes Web Business systems Other tools
  • Comet: a message, hand-off, tool call or result in flight. Red means a tool failed.
  • Ring: a LangChain callback fired at that star (chain, tool or model run)
  • Rose pulse: paused at a LangGraph breakpoint, waiting for your approval

Starting LangGraph

The graphs load and start in a moment. Each thread is a constellation: its orchestrator, the specialist subgraphs it sends work to and the tools they call.

LangGraph.js runs in your browser with a scripted model: no model API is called and no data leaves your device. You can switch the agents to a model on your GPU or to your own API key. Prompts and results are never shown.

Experiments

Free end-to-end experiment

Real AI decisions from OpenRouter's free models, recorded in your own LangSmith. Uses your OpenRouter and LangSmith connections; the Connections card asks for any that is missing.

Who makes the agents' decisions?

The graph, tools and tracing are always real LangGraph.js. What changes is the model behind each agent. Tools always return simulated business data.

The demo: always the same story, loops forever, costs nothing.

Record the runs in your LangSmith

While the agents run here, every trace is also sent to your LangSmith project with the official SDK. Open it there, side by side. Stops by itself after 40 traces.

Not recording

Look at your LangSmith project

Swap the sky to one of your projects, read-only: the last 3 hours, then new runs every few seconds. The lab's agents pause until you come back. Any LangGraph app works.

Showing the lab

Recording and showing use your LangSmith connection. Keys are managed in the Connections card, bottom right.

LangGraph and LangSmith are products of LangChain. This lab is an independent experiment.