diff --git a/extensions/feishu/src/monitor.message-handler.test.ts b/extensions/feishu/src/monitor.message-handler.test.ts
new file mode 100644
index 000000000000..b4f85763777d
--- /dev/null
+++ b/extensions/feishu/src/monitor.message-handler.test.ts
@@ -0,0 +1,112 @@
+// Feishu tests cover monitor.message handler plugin behavior.
+import { describe, expect, it, vi } from "vitest";
+import type { ClawdbotConfig, PluginRuntime } from "../runtime-api.js";
+import type { FeishuMessageEvent } from "./event-types.js";
+import { createFeishuMessageReceiveHandler } from "./monitor.message-handler.js";
+
+type MessageReceiveHandlerContext = Parameters<typeof createFeishuMessageReceiveHandler>[0];
+type HandleMessageParams = Parameters<MessageReceiveHandlerContext["handleMessage"]>[0];
+
+function createTextEvent(params: {
+  messageId: string;
+  senderOpenId: string;
+  senderType: "bot" | "user";
+}): FeishuMessageEvent {
+  return {
+    sender: {
+      sender_id: { open_id: params.senderOpenId },
+      sender_type: params.senderType,
+    },
+    message: {
+      message_id: params.messageId,
+      chat_id: "oc_chat_1",
+      chat_type: "p2p",
+      message_type: "text",
+      content: JSON.stringify({ text: "hello" }),
+    },
+  };
+}
+
+function createHandler() {
+  let onFlush: ((entries: FeishuMessageEvent[]) => Promise<void>) | undefined;
+  const enqueue = vi.fn(async (event: FeishuMessageEvent) => {
+    await onFlush?.([event]);
+  });
+  const channelRuntime = {
+    commands: {
+      isControlCommandMessage: () => false,
+    },
+    debounce: {
+      resolveInboundDebounceMs: () => 0,
+      createInboundDebouncer: vi.fn((params: { onFlush: typeof onFlush }) => {
+        onFlush = params.onFlush;
+        return { enqueue };
+      }),
+    },
+  } as unknown as PluginRuntime["channel"];
+  const handleMessage = vi.fn(async (_params: HandleMessageParams) => {});
+
+  const handler = createFeishuMessageReceiveHandler({
+    cfg: {} as ClawdbotConfig,
+    channelRuntime,
+    accountId: "default",
+    chatHistories: new Map(),
+    handleMessage,
+    resolveDebounceText: () => "hello",
+    hasProcessedMessage: vi.fn(async () => false),
+    recordProcessedMessage: vi.fn(async () => true),
+    getBotOpenId: () => "ou_bot",
+  });
+
+  return { handler, handleMessage, enqueue };
+}
+
+describe("createFeishuMessageReceiveHandler self-message filtering", () => {
+  it("drops the current bot before debounce and processing claims", async () => {
+    const { handler, handleMessage, enqueue } = createHandler();
+
+    await handler(
+      createTextEvent({
+        messageId: "om_reused",
+        senderOpenId: "ou_bot",
+        senderType: "bot",
+      }),
+    );
+    await handler(
+      createTextEvent({
+        messageId: "om_reused",
+        senderOpenId: "ou_user",
+        senderType: "user",
+      }),
+    );
+
+    expect(enqueue).toHaveBeenCalledTimes(1);
+    expect(handleMessage).toHaveBeenCalledTimes(1);
+    expect(handleMessage.mock.calls[0]?.[0]?.event.sender.sender_id.open_id).toBe("ou_user");
+  });
+
+  it("keeps peer bot and user messages flowing to dispatch", async () => {
+    const { handler, handleMessage, enqueue } = createHandler();
+
+    await handler(
+      createTextEvent({
+        messageId: "om_other_bot",
+        senderOpenId: "ou_other_bot",
+        senderType: "bot",
+      }),
+    );
+    await handler(
+      createTextEvent({
+        messageId: "om_user",
+        senderOpenId: "ou_user",
+        senderType: "user",
+      }),
+    );
+
+    expect(enqueue).toHaveBeenCalledTimes(2);
+    expect(handleMessage).toHaveBeenCalledTimes(2);
+    expect(
+      handleMessage.mock.calls.map(([params]) => params.event.sender.sender_id.open_id),
+    ).toEqual(["ou_other_bot", "ou_user"]);
+  });
+});
diff --git a/extensions/feishu/src/monitor.message-handler.ts b/extensions/feishu/src/monitor.message-handler.ts
index 624f40673cbd..e584ac61809a 100644
--- a/extensions/feishu/src/monitor.message-handler.ts
+++ b/extensions/feishu/src/monitor.message-handler.ts
@@ -321,6 +321,14 @@ export function createFeishuMessageReceiveHandler({
       return;
     }
     const messageId = event.message?.message_id?.trim();
+    const botOpenId = getBotOpenId(accountId)?.trim();
+    const senderOpenId = event.sender.sender_id.open_id?.trim();
+    if (botOpenId && senderOpenId === botOpenId) {
+      // Feishu bot receive events identify their sender by open_id. Drop this
+      // account's bot before it can consume a claim or debounce slot.
+      log(`feishu[${accountId}]: dropping self-authored message ${messageId ?? "unknown"}`);
+      return;
+    }
     const messageDedupeKey = resolveFeishuMessageDedupeKey(event);
     if (!tryBeginFeishuMessageProcessing(messageDedupeKey, accountId)) {
       log(`feishu[${accountId}]: dropping duplicate event for message ${messageId}`);