From b18e3d943ab2b23e47a597c6d14e8f34d444fde1 Mon Sep 17 00:00:00 2001
From: Clyde Stubbs <2366188+clydebarrow@users.noreply.github.com>
Date: Thu, 4 Dec 2025 19:20:55 +1100
Subject: [PATCH] [config] Provide path for `has_at_most_one_of` messages
 (#12277)

---
 esphome/config_validation.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/esphome/config_validation.py b/esphome/config_validation.py
index a3fd271a8..ee926b1b6 100644
--- a/esphome/config_validation.py
+++ b/esphome/config_validation.py
@@ -740,9 +740,10 @@ def has_at_most_one_key(*keys):
         if not isinstance(obj, dict):
             raise Invalid("expected dictionary")
 
-        number = sum(k in keys for k in obj)
-        if number > 1:
-            raise Invalid(f"Cannot specify more than one of {', '.join(keys)}.")
+        used = set(obj) & set(keys)
+        if len(used) > 1:
+            msg = "Cannot specify more than one of '" + "', '".join(used) + "'."
+            raise MultipleInvalid([Invalid(msg, path=[k]) for k in used])
         return obj
 
     return validate