diff --git a/CLAUDE.md b/CLAUDE.md
index df7829c..be3f01c 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1,6 +1,7 @@
 ## Coding Style
 - Never write shebang unless specifically requested
 - Do not abuse comments when writing code, especially code intuitive enough that does not need comments to further explain
+- When writing shell scripts, prefer zsh over bash; use `zsh -i -c` to run commands that need access to user-defined shell functions
 
 ## NixOS
 - This is my nixOS configuration for all my personal computers, and you are running on one of the nixOS hosts
diff --git a/modules/seq-command.nix b/modules/seq-command.nix
index 98d1c8d..edeaf44 100644
--- a/modules/seq-command.nix
+++ b/modules/seq-command.nix
@@ -41,12 +41,13 @@ let
 
     while [[ -s "$file" ]]; do
       cmd="$(head -n 1 "$file")"
-      tail -n +2 "$file" > "$file.tmp" && mv "$file.tmp" "$file"
 
       if [[ -n "$cmd" ]]; then
-        eval "$cmd"
+        zsh -i -c "$cmd"
       fi
 
+      tail -n +2 "$file" > "$file.tmp" && mv "$file.tmp" "$file"
+
       if [[ -s "$file" ]]; then
         sleep "$gap_seconds"
       fi