diff --git a/extensions/feishu/src/bot.checkBotMentioned.test.ts b/extensions/feishu/src/bot.checkBotMentioned.test.ts
new file mode 100644
index 000000000..2f390ba00
--- /dev/null
+++ b/extensions/feishu/src/bot.checkBotMentioned.test.ts
@@ -0,0 +1,64 @@
+import { describe, it, expect } from "vitest";
+import { parseFeishuMessageEvent } from "./bot.js";
+
+// Helper to build a minimal FeishuMessageEvent for testing
+function makeEvent(
+  chatType: "p2p" | "group",
+  mentions?: Array<{ key: string; name: string; id: { open_id?: string } }>,
+) {
+  return {
+    sender: {
+      sender_id: { user_id: "u1", open_id: "ou_sender" },
+    },
+    message: {
+      message_id: "msg_1",
+      chat_id: "oc_chat1",
+      chat_type: chatType,
+      message_type: "text",
+      content: JSON.stringify({ text: "hello" }),
+      mentions,
+    },
+  };
+}
+
+describe("parseFeishuMessageEvent – mentionedBot", () => {
+  const BOT_OPEN_ID = "ou_bot_123";
+
+  it("returns mentionedBot=false when there are no mentions", () => {
+    const event = makeEvent("group", []);
+    const ctx = parseFeishuMessageEvent(event as any, BOT_OPEN_ID);
+    expect(ctx.mentionedBot).toBe(false);
+  });
+
+  it("returns mentionedBot=true when bot is mentioned", () => {
+    const event = makeEvent("group", [
+      { key: "@_user_1", name: "Bot", id: { open_id: BOT_OPEN_ID } },
+    ]);
+    const ctx = parseFeishuMessageEvent(event as any, BOT_OPEN_ID);
+    expect(ctx.mentionedBot).toBe(true);
+  });
+
+  it("returns mentionedBot=false when only other users are mentioned", () => {
+    const event = makeEvent("group", [
+      { key: "@_user_1", name: "Alice", id: { open_id: "ou_alice" } },
+    ]);
+    const ctx = parseFeishuMessageEvent(event as any, BOT_OPEN_ID);
+    expect(ctx.mentionedBot).toBe(false);
+  });
+
+  it("returns mentionedBot=false when botOpenId is undefined (unknown bot)", () => {
+    const event = makeEvent("group", [
+      { key: "@_user_1", name: "Alice", id: { open_id: "ou_alice" } },
+    ]);
+    const ctx = parseFeishuMessageEvent(event as any, undefined);
+    expect(ctx.mentionedBot).toBe(false);
+  });
+
+  it("returns mentionedBot=false when botOpenId is empty string (probe failed)", () => {
+    const event = makeEvent("group", [
+      { key: "@_user_1", name: "Alice", id: { open_id: "ou_alice" } },
+    ]);
+    const ctx = parseFeishuMessageEvent(event as any, "");
+    expect(ctx.mentionedBot).toBe(false);
+  });
+});
diff --git a/extensions/feishu/src/bot.ts b/extensions/feishu/src/bot.ts
index f5bccd3b1..6266dc289 100644
--- a/extensions/feishu/src/bot.ts
+++ b/extensions/feishu/src/bot.ts
@@ -216,7 +216,7 @@ function parseMessageContent(content: string, messageType: string): string {
 function checkBotMentioned(event: FeishuMessageEvent, botOpenId?: string): boolean {
   const mentions = event.message.mentions ?? [];
   if (mentions.length === 0) return false;
-  if (!botOpenId) return mentions.length > 0;
+  if (!botOpenId) return false;
   return mentions.some((m) => m.id.open_id === botOpenId);
 }