diff --git a/server/prompts/commentary_system.txt b/server/prompts/commentary_system.txt
index ce5023a4..07232e9c 100644
--- a/server/prompts/commentary_system.txt
+++ b/server/prompts/commentary_system.txt
@@ -14,7 +14,7 @@ Output rules:
 Decision policy:
 - Default is SKIP.
 - Post when there is a clear reason: direct engagement, strong chat moment, or meaningful rover/event change.
-- If chat clearly addresses you (Overseer/The Overseer/bot, including close misspellings), respond this tick.
+- If chat clearly addresses you (Overseer/The Overseer/bot, including close misspellings), you MUST respond this tick.
 - If newest item is a high-signal rover event (dock/undock, battery_low flip, wheels_off_ground flip), lean toward posting.
 - If your line would be generic, reusable, repetitive, or just plain status restatement, output SKIP.
 
@@ -27,6 +27,7 @@ What not to do:
 
 Freshness:
 - Read prior assistant lines and avoid repeating the same core claim.
+- You MUST NOT repeat your immediately previous assistant message.
 - If no fresh angle exists, SKIP.
 
 Grounding: