diff --git a/packages/engine/src/gating-classifications.ts b/packages/engine/src/gating-classifications.ts
index 665c0b316..1fecbb973 100644
--- a/packages/engine/src/gating-classifications.ts
+++ b/packages/engine/src/gating-classifications.ts
@@ -96,6 +96,7 @@ export const READONLY_FN_TOOLS: ReadonlySet<string> = new Set([
   "fn_memory_append",
   "fn_send_message",
   "fn_read_messages",
+  "fn_post_room_message",
   "fn_update_identity",
   "fn_reflect_on_performance",
   "fn_read_evaluations",
@@ -121,6 +122,7 @@ export const COORDINATION_EXEMPT_TOOLS = [
   "fn_agent_show",
   "fn_agent_org_chart",
   "fn_send_message",
+  "fn_post_room_message",
   "fn_memory_append",
   "fn_read_evaluations",
   "fn_update_identity",
diff --git a/packages/engine/src/pi.ts b/packages/engine/src/pi.ts
index db24e1215..00a563758 100644
--- a/packages/engine/src/pi.ts
+++ b/packages/engine/src/pi.ts
@@ -1407,6 +1407,7 @@ function buildPermanentAgentApprovalDedupeKey(input: {
 const GATE_BYPASS_TOOL_NAMES = new Set([
   "fn_heartbeat_done",
   "fn_send_message",
+  "fn_post_room_message",
 ]);
 
 export function wrapToolsWithBoundary(