diff --git a/tools/dev/config.fish b/tools/dev/config.fish
new file mode 100644
index 00000000..e7e8a523
--- /dev/null
+++ b/tools/dev/config.fish
@@ -0,0 +1,28 @@
+if status is-interactive
+    starship init fish | source
+
+    functions --copy fish_prompt starship_fish_prompt
+
+    function fish_prompt
+        sleep $sleep_time
+        starship_fish_prompt
+    end
+
+    set -gx sleep_time 0
+
+    function toggle_sleep_time
+        if test "$sleep_time" = 0
+            set -g sleep_time 3
+        else
+            set -g sleep_time 0
+        end
+    end
+
+    bind \cS toggle_sleep_time
+
+    function history_merge
+        history merge
+    end
+
+    bind \cH history_merge
+end