diff --git a/ci-fork-pr-behavior-probe.txt b/ci-fork-pr-behavior-probe.txt
new file mode 100644
index 0000000..3254aca
--- /dev/null
+++ b/ci-fork-pr-behavior-probe.txt
@@ -0,0 +1,3 @@
+Harmless CI behavior probe for fork pull request workflow validation.
+
+This file intentionally does not read, print, or request any secrets.