From 2413a1691bf0f580201c2e85e324b25393b24031 Mon Sep 17 00:00:00 2001
From: Dan Davison <dan.davison@temporal.io>
Date: Tue, 10 Mar 2026 15:52:46 -0400
Subject: [PATCH 1/2] Make it non-`async def`

---
 hello/hello_standalone_activity.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hello/hello_standalone_activity.py b/hello/hello_standalone_activity.py
index 541d687b..7d4be0e1 100644
--- a/hello/hello_standalone_activity.py
+++ b/hello/hello_standalone_activity.py
@@ -1,4 +1,5 @@
 import asyncio
+from concurrent.futures import ThreadPoolExecutor
 from dataclasses import dataclass
 from datetime import timedelta
 
@@ -21,7 +22,7 @@ class ComposeGreetingInput:
 # This is just a normal activity. You could invoke it from a workflow but, in this sample, we are
 # invoking it directly as a standalone activity.
 @activity.defn
-async def compose_greeting(input: ComposeGreetingInput) -> str:
+def compose_greeting(input: ComposeGreetingInput) -> str:
     activity.logger.info("Running activity with parameter %s" % input)
     return f"{input.greeting}, {input.name}!"
 
@@ -68,6 +69,7 @@ async def main():
         client,
         task_queue="hello-standalone-activity-task-queue",
         activities=[compose_greeting],
+        activity_executor=ThreadPoolExecutor(5),
     ):
         # While the worker is running, use the client to execute the activity.
         await my_client_code(client)

From 591c5312c0e11cff2e97c26deb6ad83ed18036f7 Mon Sep 17 00:00:00 2001
From: Dan Davison <dan.davison@temporal.io>
Date: Tue, 10 Mar 2026 15:55:38 -0400
Subject: [PATCH 2/2] Add test

---
 tests/hello/hello_standalone_activity_test.py | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 tests/hello/hello_standalone_activity_test.py

diff --git a/tests/hello/hello_standalone_activity_test.py b/tests/hello/hello_standalone_activity_test.py
new file mode 100644
index 00000000..0b322a8d
--- /dev/null
+++ b/tests/hello/hello_standalone_activity_test.py
@@ -0,0 +1,29 @@
+import uuid
+from concurrent.futures import ThreadPoolExecutor
+from datetime import timedelta
+
+import pytest
+from temporalio.client import Client
+from temporalio.worker import Worker
+
+from hello.hello_standalone_activity import ComposeGreetingInput, compose_greeting
+
+
+async def test_execute_standalone_activity(client: Client):
+    pytest.skip("Standalone Activity is not yet supported by the CLI dev server")
+    task_queue_name = str(uuid.uuid4())
+
+    async with Worker(
+        client,
+        task_queue=task_queue_name,
+        activities=[compose_greeting],
+        activity_executor=ThreadPoolExecutor(5),
+    ):
+        result = await client.execute_activity(
+            compose_greeting,
+            args=[ComposeGreetingInput("Hello", "World")],
+            id=str(uuid.uuid4()),
+            task_queue=task_queue_name,
+            start_to_close_timeout=timedelta(seconds=10),
+        )
+        assert result == "Hello, World!"