diff --git a/AGENTS.md b/AGENTS.md
index aa6c037..188962f 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -43,7 +43,7 @@ I wanted to share some of my preferences here so we can be more aligned as we wo
 Don't. If you think it's a good idea, let me know.
 
 # When using simulators
-Don't create new simulators on my laptop, use existing ones. I'll tell you if you have to make a new one.
+Don't create new simulators on my laptop, use existing ones. I'll tell you if you have to make a new one. Also, do not create test app IDs or create temporary builds. It breaks the build cache, forces expensive native rebuilds and generally ruins my life.
 
 # oTunes
 Server is otunes.abunchofknowitalls.com for testing. Username is test@example.com. Password is password.