Follow up comment

homeassistant/components/websocket_api/commands.py

@@ -270,7 +270,7 @@ async def handle_call_service(
         connection.logger.debug("", exc_info=err)
         connection.send_error(
             msg["id"],
-            const.ERR_HOME_ASSISTANT_ERROR,
+            const.ERR_SERVICE_VALIDATION_ERROR,
             f"Validation error: {err}",
             translation_domain=err.translation_domain,
             translation_key=err.translation_key,

homeassistant/components/websocket_api/const.py

@@ -32,6 +32,7 @@
 ERR_NOT_FOUND: Final = "not_found"
 ERR_NOT_SUPPORTED: Final = "not_supported"
 ERR_HOME_ASSISTANT_ERROR: Final = "home_assistant_error"
+ERR_SERVICE_VALIDATION_ERROR: Final = "service_validation_error"
 ERR_UNKNOWN_COMMAND: Final = "unknown_command"
 ERR_UNKNOWN_ERROR: Final = "unknown_error"
 ERR_UNAUTHORIZED: Final = "unauthorized"

homeassistant/components/websocket_api/messages.py

@@ -78,8 +78,6 @@ def error_message(
         "code": code,
         "message": message,
     }
-    # In case a ServiceNotFound error is raised
-    # we use 'websocket_api' as default translation_domain.
     # In case `translation_key` is `None` we do not set it, nor the
     # `translation`_placeholders` and `translation_domain`.
     if translation_key is not None:

tests/components/websocket_api/test_commands.py

@@ -526,7 +526,7 @@ async def unknown_error_call(_):
     assert msg["id"] == 6
     assert msg["type"] == const.TYPE_RESULT
     assert msg["success"] is False
-    assert msg["error"]["code"] == "home_assistant_error"
+    assert msg["error"]["code"] == "service_validation_error"
     assert msg["error"]["message"] == "Validation error: error_message"
     assert msg["error"]["translation_placeholders"] == {"option": "bla"}
     assert msg["error"]["translation_key"] == "custom_error"