hello_world

Hello World (Graph API)

The simplest possible LangGraph + Temporal sample: a single-node graph that processes a query string.

What This Sample Demonstrates

• Defining a StateGraph with a single node
• Wrapping it with LangGraphPlugin so the node runs as a Temporal activity
• Invoking the graph from a Temporal workflow

Running the Sample

Prerequisites: uv sync --group langgraph and a running Temporal dev server (temporal server start-dev).

# Terminal 1
uv run langgraph_plugin/graph_api/hello_world/run_worker.py

# Terminal 2
uv run langgraph_plugin/graph_api/hello_world/run_workflow.py

Files

File	Description
workflow.py	process_query node, graph definition and HelloWorldWorkflow
run_worker.py	Registers graph with LangGraphPlugin, starts worker
run_workflow.py	Executes the workflow and prints the result