Improve error message

homeassistant/components/homeassistant/strings.json

@@ -196,7 +196,7 @@
       "message": "A service which does not return responses can't be called with {return_response}."
     },
     "service_lacks_response_request": {
-      "message": "The service call requires responses but caller did not ask for responses."
+      "message": "The service call requires responses and must be called with {return_response}."
     },
     "service_reponse_invalid": {
       "message": "Failed to process the returned service response data, expected a dictionary, but got {response_data_type}."

homeassistant/core.py

@@ -2592,6 +2592,7 @@ class ServiceRegistry:
             raise ServiceValidationError(
                 translation_domain=DOMAIN,
                 translation_key="service_lacks_response_request",
+                translation_placeholders={"return_response": "return_response=True"},
             )
 
         if target:

tests/test_core.py

@@ -1850,7 +1850,7 @@ async def test_serviceregistry_return_response_invalid(
     ("supports_response", "return_response", "expected_error"),
     [
         (SupportsResponse.NONE, True, "does not return responses"),
-        (SupportsResponse.ONLY, False, "caller did not ask for responses"),
+        (SupportsResponse.ONLY, False, "call requires responses"),
     ],
 )
 async def test_serviceregistry_return_response_arguments(