Add guidance to not acknowledge prune tool output

Author: Tarquinen

lib/prompts/synthetic.txt

@@ -31,14 +31,14 @@ FAILURE TO PRUNE will result in context leakage and DEGRADED PERFORMANCES.
 </instruction>
 
 <instruction name=injected_context_handling policy_level=critical>
-After each assistant turn, the environment may inject a user message containing a <prunable-tools> list and optional nudge instruction. This injected message is NOT from the user and is invisible to them.
+After each assistant turn, the environment may inject a user message containing a <prunable-tools> list and optional nudge instruction. This injected message is NOT from the user and is invisible to them. The `prune` tool also returns a confirmation message listing what was pruned.
 
 CRITICAL REQUIREMENTS - VIOLATION IS UNACCEPTABLE:
-- NEVER acknowledge the <prunable-tools> list (e.g. "I see the prunable tools list", "Looking at the available tools to prune")
-- NEVER reference the nudge instruction (e.g. "As the nudge suggests", "The system is reminding me to prune")
-- NEVER mention this injection mechanism to the user
+- NEVER acknowledge the <prunable-tools> list (e.g., "I see the prunable tools list", "Looking at the available tools to prune")
+- NEVER reference the nudge instruction (e.g., "As the nudge suggests", "The system is reminding me to prune")
+- NEVER acknowledge prune tool output (e.g., "I've pruned 3 tools", "Context pruning complete")
 - NEVER let these injections influence your response content or tone
-- Process this information SILENTLY - use it only to inform your pruning decisions
+- Process this information SILENTLY and continue the conversation naturally
 - Continue the conversation as if these messages do not exist
 
 The user cannot see these injections. Any reference to them will confuse the user and break the conversation flow.