diff --git a/src/cli/handlers/summarize.ts b/src/cli/handlers/summarize.ts
index 6d79a078..bd0756ae 100644
--- a/src/cli/handlers/summarize.ts
+++ b/src/cli/handlers/summarize.ts
@@ -7,10 +7,12 @@
  */
 
 import type { EventHandler, NormalizedHookInput, HookResult } from '../types.js';
-import { ensureWorkerRunning, getWorkerPort } from '../../shared/worker-utils.js';
+import { ensureWorkerRunning, getWorkerPort, fetchWithTimeout } from '../../shared/worker-utils.js';
 import { logger } from '../../utils/logger.js';
 import { extractLastMessage } from '../../shared/transcript-parser.js';
-import { HOOK_EXIT_CODES } from '../../shared/hook-constants.js';
+import { HOOK_EXIT_CODES, HOOK_TIMEOUTS, getTimeout } from '../../shared/hook-constants.js';
+
+const SUMMARIZE_TIMEOUT_MS = getTimeout(HOOK_TIMEOUTS.DEFAULT);
 
 export const summarizeHandler: EventHandler = {
   async execute(input: NormalizedHookInput): Promise<HookResult> {
@@ -41,15 +43,18 @@ export const summarizeHandler: EventHandler = {
     });
 
     // Send to worker - worker handles privacy check and database operations
-    const response = await fetch(`http://127.0.0.1:${port}/api/sessions/summarize`, {
-      method: 'POST',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({
-        contentSessionId: sessionId,
-        last_assistant_message: lastAssistantMessage
-      })
-      // Note: Removed signal to avoid Windows Bun cleanup issue (libuv assertion)
-    });
+    const response = await fetchWithTimeout(
+      `http://127.0.0.1:${port}/api/sessions/summarize`,
+      {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          contentSessionId: sessionId,
+          last_assistant_message: lastAssistantMessage
+        }),
+      },
+      SUMMARIZE_TIMEOUT_MS
+    );
 
     if (!response.ok) {
       // Return standard response even on failure (matches original behavior)
diff --git a/src/shared/worker-utils.ts b/src/shared/worker-utils.ts
index 406fae0f..b3985e50 100644
--- a/src/shared/worker-utils.ts
+++ b/src/shared/worker-utils.ts
@@ -10,6 +10,21 @@ const MARKETPLACE_ROOT = path.join(homedir(), '.claude', 'plugins', 'marketplace
 // Named constants for health checks
 const HEALTH_CHECK_TIMEOUT_MS = getTimeout(HOOK_TIMEOUTS.HEALTH_CHECK);
 
+/**
+ * Fetch with a timeout using Promise.race instead of AbortSignal.
+ * AbortSignal.timeout() causes a libuv assertion crash in Bun on Windows,
+ * so we use a racing setTimeout pattern that avoids signal cleanup entirely.
+ * The orphaned fetch is harmless since the process exits shortly after.
+ */
+export function fetchWithTimeout(url: string, init: RequestInit = {}, timeoutMs: number): Promise<Response> {
+  return Promise.race([
+    fetch(url, init),
+    new Promise<never>((_, reject) =>
+      setTimeout(() => reject(new Error(`Request timed out after ${timeoutMs}ms`)), timeoutMs)
+    ),
+  ]);
+}
+
 // Cache to avoid repeated settings file reads
 let cachedPort: number | null = null;
 let cachedHost: string | null = null;
@@ -65,8 +80,9 @@ export function clearPortCache(): void {
  */
 async function isWorkerHealthy(): Promise<boolean> {
   const port = getWorkerPort();
-  // Note: Removed AbortSignal.timeout to avoid Windows Bun cleanup issue (libuv assertion)
-  const response = await fetch(`http://127.0.0.1:${port}/api/health`);
+  const response = await fetchWithTimeout(
+    `http://127.0.0.1:${port}/api/health`, {}, HEALTH_CHECK_TIMEOUT_MS
+  );
   return response.ok;
 }
 
@@ -84,8 +100,9 @@ function getPluginVersion(): string {
  */
 async function getWorkerVersion(): Promise<string> {
   const port = getWorkerPort();
-  // Note: Removed AbortSignal.timeout to avoid Windows Bun cleanup issue (libuv assertion)
-  const response = await fetch(`http://127.0.0.1:${port}/api/version`);
+  const response = await fetchWithTimeout(
+    `http://127.0.0.1:${port}/api/version`, {}, HEALTH_CHECK_TIMEOUT_MS
+  );
   if (!response.ok) {
     throw new Error(`Failed to get worker version: ${response.status}`);
   }