loop: improve update_tests.sh reliability

Encouraging the agent to call the title tool immediately
has its drawbacks!
diff --git a/loop/agent_test.go b/loop/agent_test.go
index 918088d..72e7ccb 100644
--- a/loop/agent_test.go
+++ b/loop/agent_test.go
@@ -90,7 +90,7 @@
 	}
 
 	// Setup a test message that will trigger a simple, predictable response
-	userMessage := "What tools are available to you? Please just list them briefly."
+	userMessage := "What tools are available to you? Please just list them briefly. (Do not call the title tool.)"
 
 	// Send the message to the agent
 	agent.UserMessage(ctx, userMessage)