diff --git a/tools/skills_hub.py b/tools/skills_hub.py
index 0ce1d9b34e3b..aaeabd2c289b 100644
--- a/tools/skills_hub.py
+++ b/tools/skills_hub.py
@@ -2801,7 +2801,11 @@ def bundle_content_hash(bundle: SkillBundle) -> str:
     """Compute a deterministic hash for an in-memory skill bundle."""
     h = hashlib.sha256()
     for rel_path in sorted(bundle.files):
-        h.update(bundle.files[rel_path].encode("utf-8"))
+        content = bundle.files[rel_path]
+        if isinstance(content, bytes):
+            h.update(content)
+        else:
+            h.update(content.encode("utf-8"))
     return f"sha256:{h.hexdigest()[:16]}"