diff --git a/packages/tools/src/shared/forget-memory.ts b/packages/tools/src/shared/forget-memory.ts
index 8691c92ac..2f3267222 100644
--- a/packages/tools/src/shared/forget-memory.ts
+++ b/packages/tools/src/shared/forget-memory.ts
@@ -33,7 +33,9 @@ export async function forgetMemoryRequest(
 			Authorization: `Bearer ${apiKey}`,
 		},
 		body: JSON.stringify(params),
-		signal: options?.signal ?? AbortSignal.timeout(FETCH_TIMEOUT_MS),
+		signal: options?.signal
+			? AbortSignal.any([options.signal, AbortSignal.timeout(FETCH_TIMEOUT_MS)])
+			: AbortSignal.timeout(FETCH_TIMEOUT_MS),
 	})
 
 	if (!response.ok) {
diff --git a/packages/tools/src/tool-operations.test.ts b/packages/tools/src/tool-operations.test.ts
index 136a19bea..20608e14b 100644
--- a/packages/tools/src/tool-operations.test.ts
+++ b/packages/tools/src/tool-operations.test.ts
@@ -112,7 +112,7 @@ describe("memoryForget", () => {
 		expect(init.signal).toBeInstanceOf(AbortSignal)
 	})
 
-	it("uses a caller-provided signal instead of creating a timeout", async () => {
+	it("keeps the timeout when the caller provides a signal", async () => {
 		const fetchMock = stubFetch()
 		const controller = new AbortController()
 
@@ -124,7 +124,10 @@ describe("memoryForget", () => {
 		)
 
 		const [, init] = fetchMock.mock.calls[0] as [string, RequestInit]
-		expect(init.signal).toBe(controller.signal)
+		// A composed signal, not the caller's — so the 30s timeout still applies.
+		expect(init.signal).not.toBe(controller.signal)
+		controller.abort()
+		expect(init.signal?.aborted).toBe(true)
 	})
 
 	it("throws a descriptive error on non-2xx responses", async () => {