diff --git a/.gitattributes b/.gitattributes
index a3772a93..90236b24 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -3,6 +3,12 @@
 *.sh text eol=lf
 workspace-template/entrypoint.sh text eol=lf
 
+# Python hook files are invoked by .sh hooks with path substitution;
+# CRLF in either the .sh OR the .py file breaks the hook dispatch.
+# See Molecule-AI/molecule-core#507 — SessionStart hook failed silently,
+# agents returned "(no response generated)" on every A2A call.
+*.py text eol=lf
+
 # Dockerfiles and compose files are parsed by tools that tolerate CRLF,
 # but keep LF for consistency across platforms.
 Dockerfile text eol=lf