diff --git a/ssh-agent.sh b/ssh-agent.sh
index 941a2b7..fba6859 100755
--- a/ssh-agent.sh
+++ b/ssh-agent.sh
@@ -1,3 +1,17 @@
 #!/bin/bash
 
+if [ -e $HOME/.spool/ssh-agent.sock ]; then
+    PID=$(tail -n 1 $HOME/.spool/ssh-agent.env | sed 's/echo Agent pid \([0-9]*\);/\1/')
+    if [ -z $PID ]; then
+        pkill ssh-agent
+        rm $HOME/.spool/ssh-agent.*
+    else
+        CMD=$(ps -p $PID -o comm | tail -n 1)
+        if [ ! -z $CMD ] && [ $CMD == 'ssh-agent' ]; then
+            echo "Valid agent already found at $HOME/.spool/ssh-agent.sock with PID $PID"
+            exit
+        fi
+    fi
+fi
+
 eval $(ssh-agent -a $HOME/.spool/ssh-agent.sock | tee $HOME/.spool/ssh-agent.env) >/dev/null