diff --git a/.gitattributes b/.gitattributes
index b0473b13881..1110d7b0e18 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -12,3 +12,8 @@
 
 # Skill scripts run on every platform, so keep LF line endings.
 /skills/**      text=auto eol=lf
+
+# Collapse generated files in GitHub diffs and exclude them from language stats.
+/packages/contracts/generated/**  linguist-generated
+/api/openapi/markdown/**          linguist-generated
+*.generated.ts                    linguist-generated