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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