diff --git a/llm/llm.js b/llm/llm.js
index d4c892d..2e30ef4 100644
--- a/llm/llm.js
+++ b/llm/llm.js
@@ -1965,17 +1965,7 @@ async function callDedicatedOpenAICompatible(
     profileName: config.requestedLlmPresetName || "",
   });
   const settings = extension_settings[MODULE_NAME] || {};
-  const shouldPreferLukerHostRoute =
-    hostRouting.hostProfile === "luker" &&
-    (
-      config.llmConfigSource === "global" ||
-      (
-        String(config.llmConfigSource || "").startsWith("global-fallback-") &&
-        hostRouting.routeApplied === true
-      )
-    );
-  const hasDedicatedConfig =
-    hasDedicatedLLMConfig(config) && !shouldPreferLukerHostRoute;
+  const hasDedicatedConfig = hasDedicatedLLMConfig(config);
   if (taskType && config.llmPresetFallbackReason) {
     debugWarn(
       `[ST-BME] 任务 ${taskType} 指定的 API 模板不可用，已回退当前 API: ` +
@@ -2052,7 +2042,10 @@ async function callDedicatedOpenAICompatible(
     hostRequestApi: hostRouting.requestApi,
     hostRouteApplied: hostRouting.routeApplied,
     hostRouteReason: hostRouting.routeReason,
-    preferHostRoute: shouldPreferLukerHostRoute,
+    preferHostRoute:
+      !hasDedicatedConfig &&
+      hostRouting.hostProfile === "luker" &&
+      hostRouting.routeApplied === true,
     apiSettingsOverride: hostRouting.apiSettingsOverride,
     maxCompletionTokens,
     ...buildStreamDebugSnapshot(streamState),
diff --git a/maintenance/extractor.js b/maintenance/extractor.js
index 61984cd..4f88489 100644
--- a/maintenance/extractor.js
+++ b/maintenance/extractor.js
@@ -1152,7 +1152,7 @@ export async function extractMemories({
   }
 
   // 调用 LLM
-  const result = await callLLMForJSON({
+  const llmResult = await callLLMForJSON({
     systemPrompt: llmSystemPrompt,
     userPrompt: promptPayload.userPrompt,
     maxRetries: 2,
@@ -1166,8 +1166,18 @@ export async function extractMemories({
     promptMessages: promptPayload.promptMessages,
     additionalMessages: promptPayloadAdditionalMessages,
     onStreamProgress,
+    returnFailureDetails: true,
   });
   throwIfAborted(signal);
+  const llmFailure =
+    llmResult && typeof llmResult === "object" && "ok" in llmResult
+      ? llmResult
+      : null;
+  const result = llmFailure
+    ? llmFailure.ok
+      ? llmFailure.data
+      : null
+    : llmResult;
   const normalizedResult = normalizeExtractionResultPayload(result, schema);
   const ownershipWarnings = [];
   const extractionOwnerContext = deriveExtractionOwnerContext(
@@ -1199,11 +1209,23 @@ export async function extractMemories({
       `[ST-BME] 提取 LLM 未返回有效操作 ` +
         `[type=${diagType}]` +
         (diagKeys ? ` [keys=${diagKeys}]` : "") +
-        (diagPreview ? ` [preview=${diagPreview}]` : ""),
+        (diagPreview ? ` [preview=${diagPreview}]` : "") +
+        (llmFailure?.ok === false && llmFailure?.errorType
+          ? ` [failureType=${String(llmFailure.errorType)}]`
+          : "") +
+        (llmFailure?.ok === false && llmFailure?.failureReason
+          ? ` [failureReason=${String(llmFailure.failureReason).slice(0, 200)}]`
+          : ""),
     );
+    const failureReason =
+      llmFailure?.ok === false
+        ? String(llmFailure.failureReason || "").trim()
+        : "";
     return {
       success: false,
-      error: "提取 LLM 未返回有效操作",
+      error: failureReason
+        ? `提取 LLM 未返回有效操作: ${failureReason}`
+        : "提取 LLM 未返回有效操作",
       newNodes: 0,
       updatedNodes: 0,
       newEdges: 0,
diff --git a/tests/luker-llm-routing.mjs b/tests/luker-llm-routing.mjs
index 808e462..2807d44 100644
--- a/tests/luker-llm-routing.mjs
+++ b/tests/luker-llm-routing.mjs
@@ -56,6 +56,7 @@ const originalRequire = globalThis.require;
 const originalExtensionSettings = globalThis.__lukerLlmRoutingExtensionSettings;
 const originalSendOpenAIRequest = globalThis.__lukerLlmRoutingSendOpenAIRequest;
 const originalLuker = globalThis.Luker;
+const originalFetch = globalThis.fetch;
 
 globalThis.__lukerLlmRoutingExtensionSettings = {
   st_bme: {},
@@ -80,6 +81,8 @@ if (originalExtensionSettings === undefined) {
 
 let capturedOptions = null;
 let capturedMessages = null;
+let sendOpenAIRequestCalls = 0;
+let capturedFetchBody = null;
 
 globalThis.Luker = {
   getContext() {
@@ -112,6 +115,7 @@ globalThis.__lukerLlmRoutingSendOpenAIRequest = async (
   signal,
   options = {},
 ) => {
+  sendOpenAIRequestCalls += 1;
   capturedOptions = { ...(options || {}) };
   capturedMessages = Array.isArray(messages) ? [...messages] : messages;
   return {
@@ -125,6 +129,28 @@ globalThis.__lukerLlmRoutingSendOpenAIRequest = async (
   };
 };
 
+globalThis.fetch = async (_url, options = {}) => {
+  capturedFetchBody = JSON.parse(String(options.body || "{}"));
+  return new Response(
+    JSON.stringify({
+      choices: [
+        {
+          message: {
+            content: '{"operations":[]}',
+          },
+          finish_reason: "stop",
+        },
+      ],
+    }),
+    {
+      status: 200,
+      headers: {
+        "Content-Type": "application/json",
+      },
+    },
+  );
+};
+
 extensionsApi.extension_settings.st_bme = {
   taskProfiles: createDefaultTaskProfiles(),
 };
@@ -151,6 +177,8 @@ try {
 
   capturedOptions = null;
   capturedMessages = null;
+  capturedFetchBody = null;
+  sendOpenAIRequestCalls = 0;
   extensionsApi.extension_settings.st_bme = {
     llmApiUrl: "https://stale-generic-config.invalid/v1",
     llmApiKey: "sk-stale-generic",
@@ -167,15 +195,20 @@ try {
   });
 
   assert.deepEqual(routedResult, { operations: [] });
-  assert.deepEqual(capturedOptions?.apiSettingsOverride, {
-    chat_completion_source: "openai",
-    reverse_proxy: "https://example-luker-route.test/v1",
-    proxy_password: "sk-luker-route",
-    secret_id: "luker-secret-1",
-  });
+  assert.equal(
+    sendOpenAIRequestCalls,
+    0,
+    "存在可用的 BME 全局专用 LLM 配置时，不应退回宿主当前聊天路由",
+  );
+  assert.equal(
+    capturedFetchBody?.custom_url,
+    "https://stale-generic-config.invalid/v1",
+  );
 
   capturedOptions = null;
   capturedMessages = null;
+  capturedFetchBody = null;
+  sendOpenAIRequestCalls = 0;
   const taskProfiles = createDefaultTaskProfiles();
   taskProfiles.extract.profiles[0].generation.llm_preset = "luker-profile-alpha";
   extensionsApi.extension_settings.st_bme = {
@@ -218,11 +251,15 @@ try {
   });
 
   assert.deepEqual(profileRoutedResult, { operations: [] });
-  assert.deepEqual(capturedOptions?.apiSettingsOverride, {
-    chat_completion_source: "openai",
-    reverse_proxy: "https://example-luker-profile.test/v1",
-    proxy_password: "sk-luker-profile",
-  });
+  assert.equal(
+    sendOpenAIRequestCalls,
+    0,
+    "存在可用的 BME 全局专用 LLM 配置时，不应因为 Luker profile 名而劫持到当前聊天路由",
+  );
+  assert.equal(
+    capturedFetchBody?.custom_url,
+    "https://stale-generic-config.invalid/v1",
+  );
 } finally {
   if (originalSendOpenAIRequest === undefined) {
     delete globalThis.__lukerLlmRoutingSendOpenAIRequest;
@@ -230,6 +267,12 @@ try {
     globalThis.__lukerLlmRoutingSendOpenAIRequest = originalSendOpenAIRequest;
   }
 
+  if (originalFetch === undefined) {
+    delete globalThis.fetch;
+  } else {
+    globalThis.fetch = originalFetch;
+  }
+
   if (originalLuker === undefined) {
     delete globalThis.Luker;
   } else {
diff --git a/tests/p0-regressions.mjs b/tests/p0-regressions.mjs
index a355035..a9877ea 100644
--- a/tests/p0-regressions.mjs
+++ b/tests/p0-regressions.mjs
@@ -2565,6 +2565,38 @@ async function testExtractorNormalizesArrayPayloadAndPreservesScopeField() {
   }
 }
 
+async function testExtractorPropagatesLlmFailureReason() {
+  const graph = createEmptyGraph();
+  const restoreOverrides = pushTestOverrides({
+    llm: {
+      async callLLMForJSON() {
+        return {
+          ok: false,
+          errorType: "provider-error",
+          failureReason: "Invalid character name",
+        };
+      },
+    },
+  });
+
+  try {
+    const result = await extractMemories({
+      graph,
+      messages: [{ seq: 9, role: "assistant", content: "测试 LLM 失败原因" }],
+      startSeq: 9,
+      endSeq: 9,
+      schema,
+      embeddingConfig: null,
+      settings: {},
+    });
+
+    assert.equal(result.success, false);
+    assert.match(result.error, /Invalid character name/);
+  } finally {
+    restoreOverrides();
+  }
+}
+
 async function testConsolidatorMergeUpdatesSeqRange() {
   const graph = createEmptyGraph();
   const target = createNode({
@@ -7005,6 +7037,7 @@ await testCompressTypeAcceptsTopLevelFieldsResult();
 await testExtractorFailsOnUnknownOperation();
 await testExtractorNormalizesFlatCreateOperation();
 await testExtractorNormalizesArrayPayloadAndPreservesScopeField();
+await testExtractorPropagatesLlmFailureReason();
 await testConsolidatorMergeUpdatesSeqRange();
 await testConsolidatorMergeFallbackKeepsNodeWhenTargetMissing();
 await testBatchJournalVectorDeltaCapturesRecoveryFields();