Every LangGraph graph is composed of nodes. Each node receives the current state, does some work, and returns an updated state. Click each card to learn more.
🚀 See It In Action
Watch a real LangGraph-style flow run: START → LLM Node → END. The LLM node will stream a real response from the API.
💡 Key Takeaways
✔Nodes are functions — each node takes the current state as input and returns updates to that state.
✔START and END are special — they mark the entry and exit of your graph. Every graph must have them.
✔LLM nodes call the model — they read messages from state, call an LLM, and write the response back to state.
✔Tool nodes execute actions — when the LLM decides to use a tool, a tool node runs it and returns the result.