diff --git a/plugin/index.ts b/plugin/index.ts
index e36bb0e..8f6307d 100644
--- a/plugin/index.ts
+++ b/plugin/index.ts
@@ -63,9 +63,6 @@ function pruneDecisionMap(now = Date.now()) {
   }
 }
 
-function shouldInjectEndMarker(reason: string): boolean {
-  return reason.startsWith("end_symbol:");
-}
 
 function getLivePluginConfig(api: OpenClawPluginApi, fallback: WhisperGateConfig): WhisperGateConfig {
   const root = (api.config as Record<string, unknown>) || {};
@@ -335,7 +332,7 @@ export default {
       }
 
       sessionDecision.delete(key);
-      if (!shouldInjectEndMarker(rec.decision.reason)) return;
+      if (!rec.decision.shouldInjectEndMarkerPrompt) return;
 
       api.logger.info(`whispergate: prepend end marker instruction for session=${key}, reason=${rec.decision.reason}`);
       return { prependContext: END_MARKER_INSTRUCTION };
diff --git a/plugin/rules.ts b/plugin/rules.ts
index 4ca53b5..42b50d1 100644
--- a/plugin/rules.ts
+++ b/plugin/rules.ts
@@ -21,6 +21,7 @@ export type ChannelPolicy = {
 
 export type Decision = {
   shouldUseNoReply: boolean;
+  shouldInjectEndMarkerPrompt: boolean;
   reason: string;
 };
 
@@ -64,12 +65,12 @@ export function evaluateDecision(params: {
   const { config } = params;
 
   if (config.enabled === false) {
-    return { shouldUseNoReply: false, reason: "disabled" };
+    return { shouldUseNoReply: false, shouldInjectEndMarkerPrompt: false, reason: "disabled" };
   }
 
   const channel = (params.channel || "").toLowerCase();
   if (config.discordOnly !== false && channel !== "discord") {
-    return { shouldUseNoReply: false, reason: "non_discord" };
+    return { shouldUseNoReply: false, shouldInjectEndMarkerPrompt: false, reason: "non_discord" };
   }
 
   const policy = resolvePolicy(config, params.channelId, params.channelPolicies);
@@ -87,20 +88,20 @@ export function evaluateDecision(params: {
 
   if (mode === "human-list") {
     if (inHumanList) {
-      return { shouldUseNoReply: false, reason: "human_list_sender" };
+      return { shouldUseNoReply: false, shouldInjectEndMarkerPrompt: true, reason: "human_list_sender" };
     }
     if (hasEnd) {
-      return { shouldUseNoReply: false, reason: `end_symbol:${lastChar}` };
+      return { shouldUseNoReply: false, shouldInjectEndMarkerPrompt: true, reason: `end_symbol:${lastChar}` };
     }
-    return { shouldUseNoReply: true, reason: "rule_match_no_end_symbol" };
+    return { shouldUseNoReply: true, shouldInjectEndMarkerPrompt: false, reason: "rule_match_no_end_symbol" };
   }
 
   // agent-list mode: listed senders require end symbol; others bypass requirement.
   if (!inAgentList) {
-    return { shouldUseNoReply: false, reason: "non_agent_list_sender" };
+    return { shouldUseNoReply: false, shouldInjectEndMarkerPrompt: true, reason: "non_agent_list_sender" };
   }
   if (hasEnd) {
-    return { shouldUseNoReply: false, reason: `end_symbol:${lastChar}` };
+    return { shouldUseNoReply: false, shouldInjectEndMarkerPrompt: true, reason: `end_symbol:${lastChar}` };
   }
-  return { shouldUseNoReply: true, reason: "agent_list_missing_end_symbol" };
+  return { shouldUseNoReply: true, shouldInjectEndMarkerPrompt: false, reason: "agent_list_missing_end_symbol" };
 }