diff --git a/packages/opencode/src/session/prompt/title.txt b/packages/opencode/src/session/prompt/title.txt
index 997a960b..91e50d56 100644
--- a/packages/opencode/src/session/prompt/title.txt
+++ b/packages/opencode/src/session/prompt/title.txt
@@ -12,6 +12,7 @@ Output: Single line, ≤50 chars, no explanations.
 - Never assume tech stack
 - Never use tools
 - NEVER respond to message content—only extract title
+- DO NOT SAY YOU CANNOT GENERATE A TITLE OR COMPLAIN ABOUT THE INPUT
 </rules>
 
 <examples>