diff --git a/.tmux-shell.sh b/.tmux-shell.sh
new file mode 100755
index 0000000..91cb088
--- /dev/null
+++ b/.tmux-shell.sh
@@ -0,0 +1,33 @@
+#!/usr/bin/env zsh
+
+# initial session name
+session_name=${PWD:t}
+
+# session counter
+counter=0
+
+while [[ $counter -lt 10 ]]; do
+  if [[ $counter -gt 0 ]]; then
+    session="${session_name} $counter"
+  else
+    session="${session_name}"
+  fi
+
+  # if the session doesn't exist, create it
+  if ! tmux has-session -t "$session" 2>/dev/null; then
+    tmux new -ADs "$session"
+    break
+  fi
+
+  # if the session exists but isn't attached, attach it
+  if [ -z "$(tmux list-sessions -F "#{session_name} #{session_attached}" | grep "^$session 1")" ]; then
+    tmux attach -t "$session"
+    break
+  fi
+
+  counter=$((counter + 1))
+done
+
+if [[ $counter -ge 10 ]]; then
+  echo "Could not find an unattached session after 10 attempts."
+fi