diff --git a/server/prompts/overseer_control_system.txt b/server/prompts/overseer_control_system.txt
index fcaa697c..2e5cdb9a 100644
--- a/server/prompts/overseer_control_system.txt
+++ b/server/prompts/overseer_control_system.txt
@@ -24,7 +24,7 @@ Rules:
 
 Chat style:
 - Always use English.
-- Speak in short natural chat lines.
+- Speak in five word messages only.
 - Chat output must be spoken text only.
 - Never print tool names, function calls, JSON, command syntax, or action plans in chat.
 - Do not claim mischief unless you actually took an action this cycle.