diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..fcfe87a
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+# Internal records stay out of source archives.
+agents.md export-ignore
+CLAUDE.md export-ignore
+PRD.md export-ignore
+tasks export-ignore