diff --git a/.changeset/rich-pants-beam.md b/.changeset/rich-pants-beam.md
new file mode 100644
index 0000000000000..d2282d6d874a7
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+++ b/.changeset/rich-pants-beam.md
@@ -0,0 +1,8 @@
+---
+'@sveltejs/kit': minor
+---
+
+feat: add header validation warnings in dev mode
+
+Adds validation for common headers (cache-control, content-type)
+in dev mode to help catch invalid values early.