diff --git a/extractor.js b/extractor.js
index bdd1865..5b4f946 100644
--- a/extractor.js
+++ b/extractor.js
@@ -57,6 +57,16 @@ function resolveTaskPromptPayload(promptBuild, fallbackUserPrompt = "") {
   };
 }
 
+function resolveTaskLlmSystemPrompt(promptPayload, fallbackSystemPrompt = "") {
+  const hasPromptMessages =
+    Array.isArray(promptPayload?.promptMessages) &&
+    promptPayload.promptMessages.length > 0;
+  if (hasPromptMessages) {
+    return String(promptPayload?.systemPrompt || "");
+  }
+  return String(promptPayload?.systemPrompt || fallbackSystemPrompt || "");
+}
+
 function isAbortError(error) {
   return error?.name === "AbortError";
 }
@@ -396,11 +406,10 @@ export async function extractMemories({
     "请分析对话，按 JSON 格式输出操作列表。",
   ].join("\n");
   const promptPayload = resolveTaskPromptPayload(promptBuild, userPrompt);
-  const llmSystemPrompt =
-    Array.isArray(promptPayload.promptMessages) &&
-    promptPayload.promptMessages.length > 0
-      ? String(promptPayload.systemPrompt || "")
-      : String(promptPayload.systemPrompt || systemPrompt || "");
+  const llmSystemPrompt = resolveTaskLlmSystemPrompt(
+    promptPayload,
+    systemPrompt,
+  );
 
   // 调用 LLM
   const result = await callLLMForJSON({
@@ -1021,7 +1030,10 @@ export async function generateSynopsis({
   );
 
   const result = await callLLMForJSON({
-    systemPrompt: synopsisPromptPayload.systemPrompt || synopsisSystemPrompt,
+    systemPrompt: resolveTaskLlmSystemPrompt(
+      synopsisPromptPayload,
+      synopsisSystemPrompt,
+    ),
     userPrompt: synopsisPromptPayload.userPrompt,
     maxRetries: 1,
     signal,
@@ -1155,8 +1167,10 @@ export async function generateReflection({
   );
 
   const result = await callLLMForJSON({
-    systemPrompt:
-      reflectionPromptPayload.systemPrompt || reflectionSystemPrompt,
+    systemPrompt: resolveTaskLlmSystemPrompt(
+      reflectionPromptPayload,
+      reflectionSystemPrompt,
+    ),
     userPrompt: reflectionPromptPayload.userPrompt,
     maxRetries: 1,
     signal,
diff --git a/tests/p0-regressions.mjs b/tests/p0-regressions.mjs
index 9924ee9..77caf93 100644
--- a/tests/p0-regressions.mjs
+++ b/tests/p0-regressions.mjs
@@ -150,7 +150,11 @@ const {
 } = await import("../graph.js");
 const { compressType } = await import("../compressor.js");
 const { syncGraphVectorIndex } = await import("../vector-index.js");
-const { extractMemories } = await import("../extractor.js");
+const {
+  extractMemories,
+  generateReflection,
+  generateSynopsis,
+} = await import("../extractor.js");
 const { consolidateMemories } = await import("../consolidator.js");
 const {
   createBatchJournalEntry,
@@ -5033,6 +5037,180 @@ async function testLlmOutputRegexCleansResponseBeforeJsonParse() {
   }
 }
 
+async function testSynopsisUsesPromptMessagesWithoutFallbackSystemPrompt() {
+  const graph = createEmptyGraph();
+  addNode(
+    graph,
+    createNode({
+      type: "event",
+      seq: 1,
+      fields: {
+        title: "起点",
+        summary: "剧情开始，角色进入新的冲突环境。",
+        participants: "Alice",
+        status: "active",
+      },
+    }),
+  );
+  addNode(
+    graph,
+    createNode({
+      type: "event",
+      seq: 2,
+      fields: {
+        title: "升级",
+        summary: "角色发现关键线索，冲突升级。",
+        participants: "Alice, Bob",
+        status: "active",
+      },
+    }),
+  );
+  addNode(
+    graph,
+    createNode({
+      type: "event",
+      seq: 3,
+      fields: {
+        title: "转折",
+        summary: "双方对峙，局势进入新的阶段。",
+        participants: "Alice, Bob",
+        status: "active",
+      },
+    }),
+  );
+
+  const captured = [];
+  const restoreOverrides = pushTestOverrides({
+    llm: {
+      async callLLMForJSON(params = {}) {
+        captured.push(params);
+        return {
+          summary: "这是新的概要",
+        };
+      },
+    },
+  });
+
+  try {
+    await generateSynopsis({
+      graph,
+      currentSeq: 3,
+      settings: {
+        taskProfilesVersion: 3,
+        taskProfiles: createDefaultTaskProfiles(),
+      },
+    });
+
+    assert.equal(captured.length, 1);
+    assert.equal(captured[0].taskType, "synopsis");
+    assert.equal(Array.isArray(captured[0].promptMessages), true);
+    assert.ok(captured[0].promptMessages.length > 0);
+    assert.equal(captured[0].systemPrompt, "");
+    assert.equal(
+      graph.nodes.some(
+        (node) =>
+          node.type === "synopsis" &&
+          !node.archived &&
+          node.fields.summary === "这是新的概要",
+      ),
+      true,
+    );
+  } finally {
+    restoreOverrides();
+  }
+}
+
+async function testReflectionUsesPromptMessagesWithoutFallbackSystemPrompt() {
+  const graph = createEmptyGraph();
+  addNode(
+    graph,
+    createNode({
+      type: "event",
+      seq: 4,
+      fields: {
+        title: "事件一",
+        summary: "角色开始怀疑盟友的动机。",
+        participants: "Alice, Bob",
+        status: "active",
+      },
+    }),
+  );
+  addNode(
+    graph,
+    createNode({
+      type: "event",
+      seq: 5,
+      fields: {
+        title: "事件二",
+        summary: "隐藏矛盾被进一步放大。",
+        participants: "Alice, Bob",
+        status: "active",
+      },
+    }),
+  );
+  addNode(
+    graph,
+    createNode({
+      type: "character",
+      seq: 5,
+      fields: {
+        name: "Alice",
+        state: "戒备",
+      },
+    }),
+  );
+  addNode(
+    graph,
+    createNode({
+      type: "thread",
+      seq: 5,
+      fields: {
+        title: "信任危机",
+        status: "active",
+      },
+    }),
+  );
+
+  const captured = [];
+  const restoreOverrides = pushTestOverrides({
+    llm: {
+      async callLLMForJSON(params = {}) {
+        captured.push(params);
+        return {
+          insight: "最近的关系裂痕正在固定化。",
+          trigger: "连续两次试探与怀疑",
+          suggestion: "后续检索时优先关注信任破裂相关节点",
+          importance: 7,
+        };
+      },
+    },
+  });
+
+  try {
+    const result = await generateReflection({
+      graph,
+      currentSeq: 5,
+      settings: {
+        taskProfilesVersion: 3,
+        taskProfiles: createDefaultTaskProfiles(),
+      },
+    });
+
+    assert.equal(captured.length, 1);
+    assert.equal(captured[0].taskType, "reflection");
+    assert.equal(Array.isArray(captured[0].promptMessages), true);
+    assert.ok(captured[0].promptMessages.length > 0);
+    assert.equal(captured[0].systemPrompt, "");
+    const reflectionNode = graph.nodes.find((node) => node.id === result);
+    assert.equal(
+      reflectionNode?.fields?.insight,
+      "最近的关系裂痕正在固定化。",
+    );
+  } finally {
+    restoreOverrides();
+  }
+}
+
 async function testManualCompressSkipsWithoutCandidatesAndDoesNotPretendItRan() {
   const calls = {
     compressAll: 0,
@@ -5364,6 +5542,8 @@ await testRerollPreservesPrefixHashesWhenReextractDoesNotAdvance();
 await testLlmDebugSnapshotRedactsSecretsBeforeStorage();
 await testEmbeddingUsesConfigTimeoutInsteadOfDefault();
 await testLlmOutputRegexCleansResponseBeforeJsonParse();
+await testSynopsisUsesPromptMessagesWithoutFallbackSystemPrompt();
+await testReflectionUsesPromptMessagesWithoutFallbackSystemPrompt();
 await testManualCompressSkipsWithoutCandidatesAndDoesNotPretendItRan();
 await testManualCompressUsesForcedCompressionAndPersistsRealMutation();
 await testManualEvolveFallsBackToLatestExtractionBatchAfterRefresh();