hello_world

Hello World (Functional API)

The simplest possible LangGraph Functional API + Temporal sample: a single @task called from an @entrypoint.

What This Sample Demonstrates

• Defining a @task and @entrypoint
• Wrapping them with LangGraphPlugin so the task runs as a Temporal activity
• Invoking the entrypoint 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/functional_api/hello_world/run_worker.py

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

Files

File	Description
workflow.py	process_query task, hello_entrypoint, and HelloWorldFunctionalWorkflow
run_worker.py	Registers task and entrypoint with LangGraphPlugin, starts worker
run_workflow.py	Executes the workflow and prints the result