diff --git a/extensions/feishu/src/bot.checkBotMentioned.test.ts b/extensions/feishu/src/bot.checkBotMentioned.test.ts
index 0bc6cf69d..c4368a4e9 100644
--- a/extensions/feishu/src/bot.checkBotMentioned.test.ts
+++ b/extensions/feishu/src/bot.checkBotMentioned.test.ts
@@ -103,4 +103,26 @@ describe("parseFeishuMessageEvent – mentionedBot", () => {
     const ctx = parseFeishuMessageEvent(event as any, "ou_bot_123");
     expect(ctx.mentionedBot).toBe(false);
   });
+
+  it("returns mentionedBot=false for post message with at for another user", () => {
+    const postContent = JSON.stringify({
+      content: [
+        [{ tag: "at", user_id: "ou_other", user_name: "other" }],
+        [{ tag: "text", text: "hello" }],
+      ],
+    });
+    const event = {
+      sender: { sender_id: { user_id: "u1", open_id: "ou_sender" } },
+      message: {
+        message_id: "msg_1",
+        chat_id: "oc_chat1",
+        chat_type: "group",
+        message_type: "post",
+        content: postContent,
+        mentions: [],
+      },
+    };
+    const ctx = parseFeishuMessageEvent(event as any, "ou_bot_123");
+    expect(ctx.mentionedBot).toBe(false);
+  });
 });