diff --git a/src/lib/boss-data.ts b/src/lib/boss-data.ts
index 2bc2dda..80bfb4f 100644
--- a/src/lib/boss-data.ts
+++ b/src/lib/boss-data.ts
@@ -5743,9 +5743,10 @@ function appendDispatchExecutionResultInState(
   }
 
   const device = state.devices.find((item) => item.id === payload.completedByDeviceId);
+  const targetProject = state.projects.find((item) => item.id === payload.targetProjectId);
   const threadTitle =
     payload.targetThreadDisplayName?.trim() ||
-    state.projects.find((item) => item.id === payload.targetProjectId)?.threadMeta.threadDisplayName ||
+    targetProject?.threadMeta.threadDisplayName ||
     payload.targetThreadId;
 
   if (execution.status === "completed" || execution.status === "failed") {
@@ -5771,6 +5772,7 @@ function appendDispatchExecutionResultInState(
   }
 
   let mirroredResult: Message | null = null;
+  let mirroredThreadResult: Message | null = null;
   let masterSummary: Message | null = null;
 
   if (payload.status === "completed") {
@@ -5783,6 +5785,12 @@ function appendDispatchExecutionResultInState(
       body: payload.rawThreadReply.trim(),
       kind: "text",
     });
+    mirroredThreadResult = pushProjectLedgerMessage(state, payload.targetProjectId, {
+      sender: "device",
+      senderLabel: `${threadTitle} · ${device?.name ?? payload.completedByDeviceId}`,
+      body: payload.rawThreadReply.trim(),
+      kind: "text",
+    });
     masterSummary = pushProjectLedgerMessage(state, payload.groupProjectId, {
       sender: "master",
       senderLabel: "主 Agent",
@@ -5808,6 +5816,7 @@ function appendDispatchExecutionResultInState(
   return {
     execution: { ...execution },
     mirroredResult,
+    mirroredThreadResult,
     masterSummary,
   };
 }
@@ -5828,6 +5837,8 @@ export async function appendDispatchExecutionResult(payload: {
   );
   publishBossEvent("project.messages.updated", { projectId: payload.groupProjectId });
   publishBossEvent("conversation.updated", { projectId: payload.groupProjectId });
+  publishBossEvent("project.messages.updated", { projectId: payload.targetProjectId });
+  publishBossEvent("conversation.updated", { projectId: payload.targetProjectId });
   return result;
 }
 
@@ -6134,6 +6145,10 @@ export async function completeMasterAgentTask(payload: {
   });
   publishBossEvent("project.messages.updated", { projectId: result.projectId });
   publishBossEvent("conversation.updated", { projectId: result.projectId });
+  if (result.dispatchExecution?.targetProjectId) {
+    publishBossEvent("project.messages.updated", { projectId: result.dispatchExecution.targetProjectId });
+    publishBossEvent("conversation.updated", { projectId: result.dispatchExecution.targetProjectId });
+  }
   return result;
 }
 
diff --git a/tests/dispatch-execution-result.test.ts b/tests/dispatch-execution-result.test.ts
index 43e1027..b087400 100644
--- a/tests/dispatch-execution-result.test.ts
+++ b/tests/dispatch-execution-result.test.ts
@@ -221,6 +221,18 @@ test("POST /api/v1/master-agent/tasks/[taskId]/complete mirrors raw thread repli
       message.body.includes("主 Agent 汇总：线程A已返回阻塞点整理"),
   );
   assert.ok(masterSummary, "expected master-agent summary to be appended after the raw thread reply");
+
+  const targetThreadMessages =
+    nextState.projects.find((project) => project.id === execution.targetProjectId)?.messages ?? [];
+  const mirroredThreadReply = targetThreadMessages.find(
+    (message) =>
+      message.sender === "device" &&
+      message.body.includes("线程A已经完成阻塞点整理"),
+  );
+  assert.ok(
+    mirroredThreadReply,
+    "expected raw thread reply to also be mirrored back to the target single-thread conversation",
+  );
 });
 
 test("POST /api/v1/master-agent/tasks/[taskId]/complete is idempotent for repeated dispatch execution completions", async () => {