Index: llvm-toolchain-snapshot_21~++20250422102230+f541a3aad8e7/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
===================================================================
--- llvm-toolchain-snapshot_21~++20250422102230+f541a3aad8e7.orig/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
+++ llvm-toolchain-snapshot_21~++20250422102230+f541a3aad8e7/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
@@ -300,10 +300,12 @@ async def main() -> None:
         help="Allow alpha checkers from clang-analyzer.",
     )
     parser.add_argument(
-        "-clang-tidy-binary", metavar="PATH", help="Path to clang-tidy binary."
+        "-clang-tidy-binary", metavar="PATH", help="Path to clang-tidy binary.",
+        default='clang-tidy-21'
     )
     parser.add_argument(
         "-clang-apply-replacements-binary",
+        default='clang-apply-replacements-21',
         metavar="PATH",
         help="Path to clang-apply-replacements binary.",
     )