diff --git a/host/event-binding.js b/host/event-binding.js
index 76c8545..c965abe 100644
--- a/host/event-binding.js
+++ b/host/event-binding.js
@@ -585,12 +585,14 @@ export async function onGenerationAfterCommandsController(
 
   const context = runtime.getContext();
   const chat = context?.chat;
+  const generationContext = runtime.getGenerationContext?.() || null;
 
   const recallOptions = runtime.buildGenerationAfterCommandsRecallInput(
-    type,
+    generationContext?.type || type,
     {
       ...params,
       frozenInputSnapshot,
+      generationContext,
     },
     chat,
   );
@@ -601,6 +603,26 @@ export async function onGenerationAfterCommandsController(
     return;
   }
 
+  if (globalThis.__stBmeDebugLoggingEnabled === true) {
+    const tail = Array.isArray(chat)
+      ? chat.slice(-3).map((m, i) => ({
+          idx: chat.length - 3 + i,
+          is_user: Boolean(m?.is_user),
+          hasRecall: Boolean(m?.extra?.bme_recall),
+          mes: String(m?.mes || "").slice(0, 40),
+        }))
+      : null;
+    console.warn("[ST-BME][reroll-trace] AFTER_COMMANDS enter", {
+      type,
+      generationContextType: generationContext?.type || null,
+      generationContextKind: generationContext?.kind || null,
+      recallOptionsSource: recallOptions?.overrideSource || recallOptions?.source || null,
+      recallOptionsType: recallOptions?.generationType || null,
+      targetUserMessageIndex: recallOptions?.targetUserMessageIndex ?? null,
+      chatTail: tail,
+    });
+  }
+
   const recallContext = runtime.createGenerationRecallContext({
     hookName: "GENERATION_AFTER_COMMANDS",
     generationType,
diff --git a/retrieval/recall-controller.js b/retrieval/recall-controller.js
index 43344b4..6f85716 100644
--- a/retrieval/recall-controller.js
+++ b/retrieval/recall-controller.js
@@ -1,6 +1,6 @@
 // ST-BME: 召回输入解析与注入控制器（纯函数）
 
-import { debugLog } from "../runtime/debug-logging.js";
+import { debugLog, debugWarn } from "../runtime/debug-logging.js";
 import { isSystemMessageForExtraction } from "../maintenance/chat-history.js";
 
 export function buildRecallRecentMessagesController(
@@ -161,13 +161,29 @@ function resolveReusablePersistedRecallRecord(chat, recallInput, runtime) {
     }
   }
 
-  if (!Number.isFinite(targetUserMessageIndex)) return null;
+  if (!Number.isFinite(targetUserMessageIndex)) {
+    debugWarn("[ST-BME][reroll-trace] no target user floor resolved", {
+      generationType,
+      recallSource,
+      currentRecallInputText: currentRecallInputText.slice(0, 60),
+      chatLength: Array.isArray(chat) ? chat.length : null,
+    });
+    return null;
+  }
 
   const targetMessage = Array.isArray(chat) ? chat[targetUserMessageIndex] : null;
   if (!targetMessage?.is_user) return null;
 
   const record = readPersistedRecallFromUserMessage(chat, targetUserMessageIndex);
-  if (!record?.injectionText) return null;
+  if (!record?.injectionText) {
+    debugWarn("[ST-BME][reroll-trace] target floor has no persisted recall record", {
+      generationType,
+      recallSource,
+      targetUserMessageIndex,
+      targetUserFloorText: String(targetMessage?.mes || "").slice(0, 60),
+    });
+    return null;
+  }
 
   const currentUserFloorText = normalizeText(targetMessage?.mes || "");
   const recordRecallInput = normalizeText(record?.recallInput || "");
@@ -228,9 +244,34 @@ function resolveReusablePersistedRecallRecord(chat, recallInput, runtime) {
     !canReuseUnboundTargetRecord &&
     !canTrustUserFloorRecord
   ) {
+    debugWarn("[ST-BME][reroll-trace] reuse REJECTED", {
+      generationType,
+      recallSource,
+      targetUserMessageIndex,
+      isActiveInputSource,
+      isNoNewUserGeneration,
+      hasRecord: Boolean(record?.injectionText),
+      currentUserFloorText: currentUserFloorText.slice(0, 60),
+      currentRecallInputText: currentRecallInputText.slice(0, 60),
+      recordRecallInput: recordRecallInput.slice(0, 60),
+      boundUserFloorText: boundUserFloorText.slice(0, 60),
+      matchesPersistedRecord,
+      canReuseUnboundTargetRecord,
+      canTrustUserFloorRecord,
+      recordRecallInputMismatch,
+    });
     return null;
   }
 
+  debugWarn("[ST-BME][reroll-trace] reuse ACCEPTED", {
+    generationType,
+    recallSource,
+    targetUserMessageIndex,
+    matchesPersistedRecord,
+    canReuseUnboundTargetRecord,
+    canTrustUserFloorRecord,
+  });
+
   return {
     record,
     targetUserMessageIndex,