diff --git a/extensions/feishu/src/chat-schema.ts b/extensions/feishu/src/chat-schema.ts
index 5460f11dcc9..702773d4b73 100644
--- a/extensions/feishu/src/chat-schema.ts
+++ b/extensions/feishu/src/chat-schema.ts
@@ -9,6 +9,11 @@ export const FeishuChatSchema = Type.Object({
     enum: [...CHAT_ACTION_VALUES],
     description: "Action to run: members | info | member_info",
   }),
+  accountId: Type.Optional(
+    Type.String({
+      description: "Optional Feishu account override for multi-account setups",
+    }),
+  ),
   chat_id: Type.Optional(Type.String({ description: "Chat ID (from URL or event payload)" })),
   member_id: Type.Optional(Type.String({ description: "Member ID for member_info lookups" })),
   page_size: Type.Optional(Type.Number({ description: "Page size (1-100, default 50)" })),
diff --git a/extensions/feishu/src/tool-account-routing.test.ts b/extensions/feishu/src/tool-account-routing.test.ts
index 4b20d422037..af357838c7d 100644
--- a/extensions/feishu/src/tool-account-routing.test.ts
+++ b/extensions/feishu/src/tool-account-routing.test.ts
@@ -140,6 +140,23 @@ describe("feishu tool account routing", () => {
     expect(createFeishuClientMock.mock.calls.at(-1)?.[0]?.appId).toBe("app-b");
   });
 
+  test("chat tool allows explicit accountId override when defaultAccount disables chat", async () => {
+    chatGetMock.mockResolvedValue({ code: 0, data: { name: "chat", user_count: 1 } });
+    const { api, resolveTool } = createToolFactoryHarness(
+      createConfig({
+        defaultAccount: "b",
+        toolsA: { chat: true },
+        toolsB: { chat: false },
+      }),
+    );
+    registerFeishuChatTools(api);
+
+    const tool = resolveTool("feishu_chat", { agentAccountId: "a" });
+    await tool.execute("call", { action: "info", chat_id: "oc_a", accountId: "a" });
+
+    expect(createFeishuClientMock.mock.calls.at(-1)?.[0]?.appId).toBe("app-a");
+  });
+
   test("chat tool blocks execution when the routed account disables chat", async () => {
     const { api, resolveTool } = createToolFactoryHarness(
       createConfig({