diff --git a/packages/api/src/__tests__/assistant-tools-query-change-history.test.ts b/packages/api/src/__tests__/assistant-tools-query-change-history.test.ts
new file mode 100644
index 0000000..90f427c
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-query-change-history.test.ts
@@ -0,0 +1,91 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { SystemRole } from "@capakraken/shared";
+
+vi.mock("@capakraken/application", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("@capakraken/application")>();
+  return {
+    ...actual,
+    getDashboardBudgetForecast: vi.fn().mockResolvedValue([]),
+    getDashboardPeakTimes: vi.fn().mockResolvedValue([]),
+    listAssignmentBookings: vi.fn().mockResolvedValue([]),
+  };
+});
+
+import { executeTool } from "../router/assistant-tools.js";
+import { createToolContext } from "./assistant-tools-audit-task-test-helpers.js";
+
+describe("assistant query change history tool", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("queries recent change history through the real audit router path", async () => {
+    const ctx = createToolContext(
+      {
+        auditLog: {
+          findMany: vi.fn().mockResolvedValue([
+            {
+              id: "audit_1",
+              entityType: "Project",
+              entityId: "project_1",
+              entityName: "Gelddruckmaschine",
+              action: "UPDATE",
+              userId: "user_1",
+              source: "assistant",
+              summary: "Adjusted project margin",
+              createdAt: new Date("2026-03-28T10:00:00.000Z"),
+              user: {
+                id: "user_1",
+                name: "Larissa",
+                email: "larissa@example.com",
+              },
+            },
+          ]),
+        },
+      },
+      { userRole: SystemRole.CONTROLLER },
+    );
+
+    const result = await executeTool(
+      "query_change_history",
+      JSON.stringify({
+        entityType: "Project",
+        search: "Gelddruckmaschine",
+        action: "UPDATE",
+        daysBack: 14,
+        limit: 5,
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      filters: {
+        entityType: "Project",
+        userId: null,
+        action: "UPDATE",
+        search: "Gelddruckmaschine",
+        daysBack: 14,
+      },
+      itemCount: 1,
+      nextCursor: null,
+      items: [
+        {
+          id: "audit_1",
+          entityType: "Project",
+          entityId: "project_1",
+          entityName: "Gelddruckmaschine",
+          action: "UPDATE",
+          userId: "user_1",
+          source: "assistant",
+          summary: "Adjusted project margin",
+          createdAt: "2026-03-28T10:00:00.000Z",
+          user: {
+            id: "user_1",
+            name: "Larissa",
+            email: "larissa@example.com",
+          },
+        },
+      ],
+    });
+  });
+});