Add script specific error messages for response_variable (#95188)

homeassistant/core.py

@@ -1753,6 +1753,17 @@ class ServiceRegistry:
         """
         return service.lower() in self._services.get(domain.lower(), [])
 
+    def supports_response(self, domain: str, service: str) -> SupportsResponse:
+        """Return whether or not the service supports response data.
+
+        This exists so that callers can return more helpful error messages given
+        the context. Will return NONE if the service does not exist as there is
+        other error handling when calling the service if it does not exist.
+        """
+        if not (handler := self._services[domain][service]):
+            return SupportsResponse.NONE
+        return handler.supports_response
+
     def register(
         self,
         domain: str,