diff --git a/home.nix b/home.nix
index b826da4..f0f8ae8 100644
--- a/home.nix
+++ b/home.nix
@@ -173,11 +173,12 @@
         allow = [
           "Edit"
           "Write"
-          "Bash(git *)"
+          "Bash(git:*)"
         ];
       };
-      customInstructions = "When working in a git repository, always use conventional commits format (e.g., feat:, fix:, docs:, style:, refactor:, test:, chore:) for commit messages.";
+      customInstructions = "When working in a git repository, always use conventional commits format (e.g., feat:, fix:, docs:, style:, refactor:, test:, chore:) for commit messages. Do not include the Claude Code signature or Co-Authored-By line in commit messages.";
       alwaysThinkingEnabled = true;
+      includeCoAuthoredBy = false;
     };
     force = true;
   };