In Prefect 3.x, the simplest way is:

python
import os
from prefect import flow

@flow
def my_flow():
    worker_name = os.environ.get("PREFECT__WORKER_NAME")
    print(f"Worker name: {worker_name}")

A few important notes: -

PREFECT__WORKER_NAME

is set by the worker at execution time - it will typically be

None

if the flow is not running under a Prefect worker - there is not a standard

prefect.runtime.flow_run.worker_name

field for this If you also want the worker ID:

python
import os
from prefect import flow

@flow
def my_flow():
    print("Worker name:", os.environ.get("PREFECT__WORKER_NAME"))
    print("Worker id:", os.environ.get("PREFECT__WORKER_ID"))

Related docs: - Workers - Runtime context If you want, I can also show how to get this from inside a task or log it automatically for every run.