diff --git a/extensions/feishu/src/bot-content.ts b/extensions/feishu/src/bot-content.ts
index 8f0f90f1c14..22212ca67aa 100644
--- a/extensions/feishu/src/bot-content.ts
+++ b/extensions/feishu/src/bot-content.ts
@@ -38,6 +38,10 @@ type FeishuMessageLike = {
 
 export type GroupSessionScope = "group" | "group_sender" | "group_topic" | "group_topic_sender";
 
+type FeishuLogger = {
+  (...args: unknown[]): void;
+};
+
 export type ResolvedFeishuGroupSession = {
   peerId: string;
   parentPeer: { kind: "group"; id: string } | null;
@@ -182,10 +186,7 @@ function formatSubMessageContent(content: string, contentType: string): string {
   }
 }
 
-export function parseMergeForwardContent(params: {
-  content: string;
-  log?: (...args: any[]) => void;
-}): string {
+export function parseMergeForwardContent(params: { content: string; log?: FeishuLogger }): string {
   const { content, log } = params;
   const maxMessages = 50;
   log?.("feishu: parsing merge_forward sub-messages from API response");
diff --git a/extensions/feishu/src/client.ts b/extensions/feishu/src/client.ts
index c4498dcffc3..30621e7a4e7 100644
--- a/extensions/feishu/src/client.ts
+++ b/extensions/feishu/src/client.ts
@@ -31,6 +31,11 @@ export const FEISHU_HTTP_TIMEOUT_MS = 30_000;
 export const FEISHU_HTTP_TIMEOUT_MAX_MS = 300_000;
 export const FEISHU_HTTP_TIMEOUT_ENV_VAR = "OPENCLAW_FEISHU_HTTP_TIMEOUT_MS";
 
+type FeishuHttpInstanceLike = Pick<
+  typeof feishuClientSdk.defaultHttpInstance,
+  "request" | "get" | "post" | "put" | "patch" | "delete" | "head" | "options"
+>;
+
 function getWsProxyAgent(): HttpsProxyAgent<string> | undefined {
   const proxyUrl =
     process.env.https_proxy ||
@@ -66,8 +71,7 @@ function resolveDomain(domain: FeishuDomain | undefined): Lark.Domain | string {
  * (e.g. when the Feishu API is slow, causing per-chat queue deadlocks).
  */
 function createTimeoutHttpInstance(defaultTimeoutMs: number): Lark.HttpInstance {
-  const base: Lark.HttpInstance =
-    feishuClientSdk.defaultHttpInstance as unknown as Lark.HttpInstance;
+  const base: FeishuHttpInstanceLike = feishuClientSdk.defaultHttpInstance;
 
   function injectTimeout<D>(opts?: Lark.HttpRequestOptions<D>): Lark.HttpRequestOptions<D> {
     return { timeout: defaultTimeoutMs, ...opts } as Lark.HttpRequestOptions<D>;
diff --git a/extensions/feishu/src/monitor.account.ts b/extensions/feishu/src/monitor.account.ts
index bac8e75bb44..1e14abfcbde 100644
--- a/extensions/feishu/src/monitor.account.ts
+++ b/extensions/feishu/src/monitor.account.ts
@@ -159,6 +159,142 @@ type RegisterEventHandlersContext = {
   fireAndForget?: boolean;
 };
 
+type FeishuBotMenuEvent = {
+  event_key?: string;
+  timestamp?: string | number;
+  operator?: {
+    operator_name?: string;
+    operator_id?: { open_id?: string; user_id?: string; union_id?: string };
+  };
+};
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null;
+}
+
+function readString(value: unknown): string | undefined {
+  return typeof value === "string" ? value : undefined;
+}
+
+function readStringOrNumber(value: unknown): string | number | undefined {
+  return typeof value === "string" || typeof value === "number" ? value : undefined;
+}
+
+function parseFeishuMessageEventPayload(value: unknown): FeishuMessageEvent | null {
+  if (!isRecord(value)) {
+    return null;
+  }
+  const sender = value.sender;
+  const message = value.message;
+  if (!isRecord(sender) || !isRecord(message)) {
+    return null;
+  }
+  const senderId = sender.sender_id;
+  if (!isRecord(senderId)) {
+    return null;
+  }
+  const messageId = readString(message.message_id);
+  const chatId = readString(message.chat_id);
+  const chatType = normalizeFeishuChatType(message.chat_type);
+  const messageType = readString(message.message_type);
+  const content = readString(message.content);
+  if (!messageId || !chatId || !chatType || !messageType || !content) {
+    return null;
+  }
+  return value as FeishuMessageEvent;
+}
+
+function parseFeishuBotAddedEventPayload(value: unknown): FeishuBotAddedEvent | null {
+  if (!isRecord(value) || !readString(value.chat_id) || !isRecord(value.operator_id)) {
+    return null;
+  }
+  return value as FeishuBotAddedEvent;
+}
+
+function parseFeishuBotRemovedChatId(value: unknown): string | null {
+  if (!isRecord(value)) {
+    return null;
+  }
+  return readString(value.chat_id) ?? null;
+}
+
+function parseFeishuBotMenuEvent(value: unknown): FeishuBotMenuEvent | null {
+  if (!isRecord(value)) {
+    return null;
+  }
+  const operator = value.operator;
+  if (operator !== undefined && !isRecord(operator)) {
+    return null;
+  }
+  return {
+    event_key: readString(value.event_key),
+    timestamp: readStringOrNumber(value.timestamp),
+    operator: operator
+      ? {
+          operator_name: readString(operator.operator_name),
+          operator_id: isRecord(operator.operator_id)
+            ? {
+                open_id: readString(operator.operator_id.open_id),
+                user_id: readString(operator.operator_id.user_id),
+                union_id: readString(operator.operator_id.union_id),
+              }
+            : undefined,
+        }
+      : undefined,
+  };
+}
+
+function parseFeishuCardActionEventPayload(value: unknown): FeishuCardActionEvent | null {
+  if (!isRecord(value)) {
+    return null;
+  }
+  const operator = value.operator;
+  const action = value.action;
+  const context = value.context;
+  if (!isRecord(operator) || !isRecord(action) || !isRecord(context)) {
+    return null;
+  }
+  const token = readString(value.token);
+  const openId = readString(operator.open_id);
+  const userId = readString(operator.user_id);
+  const unionId = readString(operator.union_id);
+  const tag = readString(action.tag);
+  const actionValue = action.value;
+  const contextOpenId = readString(context.open_id);
+  const contextUserId = readString(context.user_id);
+  const chatId = readString(context.chat_id);
+  if (
+    !token ||
+    !openId ||
+    !userId ||
+    !unionId ||
+    !tag ||
+    !isRecord(actionValue) ||
+    !contextOpenId ||
+    !contextUserId ||
+    !chatId
+  ) {
+    return null;
+  }
+  return {
+    operator: {
+      open_id: openId,
+      user_id: userId,
+      union_id: unionId,
+    },
+    token,
+    action: {
+      value: actionValue,
+      tag,
+    },
+    context: {
+      open_id: contextOpenId,
+      user_id: contextUserId,
+      chat_id: chatId,
+    },
+  };
+}
+
 /**
  * Per-chat serial queue that ensures messages from the same chat are processed
  * in arrival order while allowing different chats to run concurrently.
@@ -410,7 +546,11 @@ function registerEventHandlers(
 
   eventDispatcher.register({
     "im.message.receive_v1": async (data) => {
-      const event = data as unknown as FeishuMessageEvent;
+      const event = parseFeishuMessageEventPayload(data);
+      if (!event) {
+        error(`feishu[${accountId}]: ignoring malformed message event payload`);
+        return;
+      }
       const messageId = event.message?.message_id?.trim();
       if (!tryBeginFeishuMessageProcessing(messageId, accountId)) {
         log(`feishu[${accountId}]: dropping duplicate event for message ${messageId}`);
@@ -438,7 +578,10 @@ function registerEventHandlers(
     },
     "im.chat.member.bot.added_v1": async (data) => {
       try {
-        const event = data as unknown as FeishuBotAddedEvent;
+        const event = parseFeishuBotAddedEventPayload(data);
+        if (!event) {
+          return;
+        }
         log(`feishu[${accountId}]: bot added to chat ${event.chat_id}`);
       } catch (err) {
         error(`feishu[${accountId}]: error handling bot added event: ${String(err)}`);
@@ -446,8 +589,11 @@ function registerEventHandlers(
     },
     "im.chat.member.bot.deleted_v1": async (data) => {
       try {
-        const event = data as unknown as { chat_id: string };
-        log(`feishu[${accountId}]: bot removed from chat ${event.chat_id}`);
+        const chatId = parseFeishuBotRemovedChatId(data);
+        if (!chatId) {
+          return;
+        }
+        log(`feishu[${accountId}]: bot removed from chat ${chatId}`);
       } catch (err) {
         error(`feishu[${accountId}]: error handling bot removed event: ${String(err)}`);
       }
@@ -513,14 +659,10 @@ function registerEventHandlers(
     },
     "application.bot.menu_v6": async (data) => {
       try {
-        const event = data as {
-          event_key?: string;
-          timestamp?: string | number;
-          operator?: {
-            operator_name?: string;
-            operator_id?: { open_id?: string; user_id?: string; union_id?: string };
-          };
-        };
+        const event = parseFeishuBotMenuEvent(data);
+        if (!event) {
+          return;
+        }
         const operatorOpenId = event.operator?.operator_id?.open_id?.trim();
         const eventKey = event.event_key?.trim();
         if (!operatorOpenId || !eventKey) {
@@ -598,7 +740,11 @@ function registerEventHandlers(
     },
     "card.action.trigger": async (data: unknown) => {
       try {
-        const event = data as unknown as FeishuCardActionEvent;
+        const event = parseFeishuCardActionEventPayload(data);
+        if (!event) {
+          error(`feishu[${accountId}]: ignoring malformed card action payload`);
+          return;
+        }
         const promise = handleFeishuCardAction({
           cfg,
           event,
diff --git a/extensions/feishu/src/probe.ts b/extensions/feishu/src/probe.ts
index e4b8d76f0c1..0fcbc5f14e8 100644
--- a/extensions/feishu/src/probe.ts
+++ b/extensions/feishu/src/probe.ts
@@ -24,6 +24,15 @@ type FeishuBotInfoResponse = {
   data?: { bot?: { bot_name?: string; open_id?: string } };
 };
 
+type FeishuRequestClient = ReturnType<typeof createFeishuClient> & {
+  request(params: {
+    method: "GET";
+    url: string;
+    data: Record<string, never>;
+    timeout: number;
+  }): Promise<FeishuBotInfoResponse>;
+};
+
 function setCachedProbeResult(
   cacheKey: string,
   result: FeishuProbeResult,
@@ -70,16 +79,15 @@ export async function probeFeishu(
   }
 
   try {
-    const client = createFeishuClient(creds);
+    const client = createFeishuClient(creds) as FeishuRequestClient;
     // Use bot/v3/info API to get bot information
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any -- SDK generic request method
     const responseResult = await raceWithTimeoutAndAbort<FeishuBotInfoResponse>(
-      (client as any).request({
+      client.request({
         method: "GET",
         url: "/open-apis/bot/v3/info",
         data: {},
         timeout: timeoutMs,
-      }) as Promise<FeishuBotInfoResponse>,
+      }),
       {
         timeoutMs,
         abortSignal: options.abortSignal,