diff --git a/src/agents/pi-embedded-runner/run.overflow-compaction.mocks.shared.ts b/src/agents/pi-embedded-runner/run.overflow-compaction.mocks.shared.ts
index 431942cb8be..c31da1acc70 100644
--- a/src/agents/pi-embedded-runner/run.overflow-compaction.mocks.shared.ts
+++ b/src/agents/pi-embedded-runner/run.overflow-compaction.mocks.shared.ts
@@ -1,10 +1,31 @@
 import { vi } from "vitest";
+import type {
+  PluginHookAgentContext,
+  PluginHookBeforeAgentStartResult,
+  PluginHookBeforeModelResolveResult,
+  PluginHookBeforePromptBuildResult,
+} from "../../plugins/types.js";
 
 export const mockedGlobalHookRunner = {
-  hasHooks: vi.fn(() => false),
-  runBeforeAgentStart: vi.fn(async () => undefined),
-  runBeforePromptBuild: vi.fn(async () => undefined),
-  runBeforeModelResolve: vi.fn(async () => undefined),
+  hasHooks: vi.fn((_hookName: string) => false),
+  runBeforeAgentStart: vi.fn(
+    async (
+      _event: { prompt: string; messages?: unknown[] },
+      _ctx: PluginHookAgentContext,
+    ): Promise<PluginHookBeforeAgentStartResult | undefined> => undefined,
+  ),
+  runBeforePromptBuild: vi.fn(
+    async (
+      _event: { prompt: string; messages: unknown[] },
+      _ctx: PluginHookAgentContext,
+    ): Promise<PluginHookBeforePromptBuildResult | undefined> => undefined,
+  ),
+  runBeforeModelResolve: vi.fn(
+    async (
+      _event: { prompt: string },
+      _ctx: PluginHookAgentContext,
+    ): Promise<PluginHookBeforeModelResolveResult | undefined> => undefined,
+  ),
 };
 
 vi.mock("../../plugins/hook-runner-global.js", () => ({