diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..200c7e4
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,12 @@
+# Everything here runs on Linux accelerator hosts, and campaign receipts record
+# the SHA-256 of the harness files they were produced by. A CRLF checkout on
+# Windows would both break the shell drivers and change every recorded digest,
+# so pin the text formats this repository ships.
+*.py text eol=lf
+*.sh text eol=lf
+*.json text eol=lf
+*.yaml text eol=lf
+*.csv text eol=lf
+*.tsv text eol=lf
+*.txt text eol=lf
+*.md text eol=lf