diff --git a/src/signal/monitor.tool-result.pairs-uuid-only-senders-uuid-allowlist-entry.e2e.test.ts b/src/signal/monitor.tool-result.pairs-uuid-only-senders-uuid-allowlist-entry.e2e.test.ts
index 3a97fe8b39e..5f51b56df91 100644
--- a/src/signal/monitor.tool-result.pairs-uuid-only-senders-uuid-allowlist-entry.e2e.test.ts
+++ b/src/signal/monitor.tool-result.pairs-uuid-only-senders-uuid-allowlist-entry.e2e.test.ts
@@ -1,5 +1,4 @@
 import { describe, expect, it, vi } from "vitest";
-import { monitorSignalProvider } from "./monitor.js";
 import {
   config,
   flush,
@@ -10,6 +9,9 @@ import {
 
 installSignalToolResultTestHooks();
 
+// Import after the harness registers `vi.mock(...)` for Signal internals.
+const { monitorSignalProvider } = await import("./monitor.js");
+
 const { replyMock, sendMock, streamMock, upsertPairingRequestMock } =
   getSignalToolResultTestMocks();
 
diff --git a/src/signal/monitor.tool-result.sends-tool-summaries-responseprefix.test.ts b/src/signal/monitor.tool-result.sends-tool-summaries-responseprefix.test.ts
index eb955702114..0f686fb0bcf 100644
--- a/src/signal/monitor.tool-result.sends-tool-summaries-responseprefix.test.ts
+++ b/src/signal/monitor.tool-result.sends-tool-summaries-responseprefix.test.ts
@@ -3,7 +3,6 @@ import type { OpenClawConfig } from "../config/config.js";
 import { peekSystemEvents } from "../infra/system-events.js";
 import { resolveAgentRoute } from "../routing/resolve-route.js";
 import { normalizeE164 } from "../utils.js";
-import { monitorSignalProvider } from "./monitor.js";
 import {
   config,
   flush,
@@ -14,6 +13,9 @@ import {
 
 installSignalToolResultTestHooks();
 
+// Import after the harness registers `vi.mock(...)` for Signal internals.
+const { monitorSignalProvider } = await import("./monitor.js");
+
 const {
   replyMock,
   sendMock,