diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-autoinstrument/src/instrument.server.ts b/dev-packages/e2e-tests/test-applications/cloudflare-autoinstrument/src/instrument.server.ts
index 2461cc5fd5aa..96f3bb4b2561 100644
--- a/dev-packages/e2e-tests/test-applications/cloudflare-autoinstrument/src/instrument.server.ts
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-autoinstrument/src/instrument.server.ts
@@ -2,7 +2,6 @@
 // the worker entry named in wrangler's `main`) and imports its default export as
 // the options callback for every wrapper it injects.
 export default (env: Env) => ({
-  traceLifecycle: 'static' as const,
   dsn: env.E2E_TEST_DSN,
   environment: 'qa',
   tunnel: 'http://localhost:3031/',
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-autoinstrument/tests/autoinstrument.test.ts b/dev-packages/e2e-tests/test-applications/cloudflare-autoinstrument/tests/autoinstrument.test.ts
index 4a8d4d8f3bce..8f1572841f42 100644
--- a/dev-packages/e2e-tests/test-applications/cloudflare-autoinstrument/tests/autoinstrument.test.ts
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-autoinstrument/tests/autoinstrument.test.ts
@@ -1,27 +1,30 @@
 import { expect, test } from '@playwright/test';
-import { waitForTransaction } from '@sentry-internal/test-utils';
+import { collectStreamedSpans, getSpanOp, waitForStreamedSpan } from '@sentry-internal/test-utils';
+import type { SerializedStreamedSpan } from '@sentry/core';
 import { callRpc } from './agent-socket';
 
 // The worker entry (`src/index.ts`) contains no Sentry calls at all — every
 // wrapper below was injected by the Vite auto-instrument plugin at build time.
-// Any transaction arriving here therefore proves the injection happened.
+// Any span arriving here therefore proves the injection happened.
+
+function isPlainDoRequestSegment(span: SerializedStreamedSpan): boolean {
+  return getSpanOp(span) === 'http.server' && span.is_segment && span.attributes['url.path']?.value === '/plain-do';
+}
 
 test('wraps the default export with withSentry (options from instrument.server.ts)', async ({ baseURL }) => {
-  const transactionPromise = waitForTransaction('cloudflare-autoinstrument', event => {
-    return event.contexts?.trace?.op === 'http.server' && (event.request?.url ?? '').includes('/plain-do');
-  });
+  const spanPromise = waitForStreamedSpan('cloudflare-autoinstrument', isPlainDoRequestSegment);
 
   const res = await fetch(`${baseURL}/plain-do`);
   expect(res.status).toBe(200);
   await expect(res.json()).resolves.toEqual({ durableObject: true });
 
-  const transaction = await transactionPromise;
+  const span = await spanPromise;
 
-  expect(transaction.contexts?.trace?.origin).toBe('auto.http.cloudflare');
+  expect(span.attributes['sentry.origin']?.value).toBe('auto.http.cloudflare');
   // `environment: 'qa'` is only set in `instrument.server.ts`, so seeing it here
   // proves the plugin sourced its options callback from that file rather than
   // falling back to reading configuration off `env`.
-  expect(transaction.environment).toBe('qa');
+  expect(span.attributes['sentry.environment']?.value).toBe('qa');
 });
 
 // Each of these three classes is registered in wrangler.jsonc exactly like the
@@ -49,10 +52,18 @@ for (const { title, binding, agentClass } of [
   test(`applies agent instrumentation to ${title}`, async ({ baseURL }) => {
     const instance = `${binding}-instance`;
 
-    const transactionPromise = waitForTransaction('cloudflare-autoinstrument', event => {
+    const isGreetRpcSpan = (span: SerializedStreamedSpan): boolean =>
+      getSpanOp(span) === 'rpc' &&
+      span.name === 'greet' &&
+      String(span.attributes['gen_ai.agent.name']?.value ?? '').includes(agentClass);
+
+    // The rpc span is a child of the `webSocketMessage` segment span, which ends after it and is
+    // streamed in a later envelope, so collect until both have arrived.
+    const spansPromise = collectStreamedSpans('cloudflare-autoinstrument', spans => {
+      const rpcSpan = spans.find(isGreetRpcSpan);
       return (
-        event.transaction === 'webSocketMessage' &&
-        (event.spans ?? []).some(span => span.op === 'rpc' && span.description === 'greet')
+        !!rpcSpan &&
+        spans.some(span => span.is_segment && span.name === 'webSocketMessage' && span.trace_id === rpcSpan.trace_id)
       );
     });
 
@@ -61,38 +72,35 @@ for (const { title, binding, agentClass } of [
     const reply = await callRpc(baseURL!, { binding, instance, method: 'greet', args: ['World'] });
     expect(reply).toBe(`Hello, World! (from ${agentClass})`);
 
-    const transaction = await transactionPromise;
-    const rpcSpan = (transaction.spans ?? []).find(span => span.op === 'rpc' && span.description === 'greet');
-
-    expect(rpcSpan).toEqual(
-      expect.objectContaining({
-        op: 'rpc',
-        description: 'greet',
-        origin: 'auto.faas.cloudflare.agents',
-        data: expect.objectContaining({
-          // Read back off the instance at runtime (`_ParentClass.name`), so it
-          // confirms the wrapper landed on the user's real class. Matched loosely
-          // because the transform renames the class it wraps to
-          // `__SENTRY_ORIGINAL_<name>__` and the bundler infers that name.
-          'gen_ai.agent.name': expect.stringContaining(agentClass),
-        }),
-      }),
-    );
+    const spans = await spansPromise;
+    const rpcSpan = spans.find(isGreetRpcSpan)!;
+
+    expect(rpcSpan.attributes).toMatchObject({
+      'sentry.op': { value: 'rpc', type: 'string' },
+      'sentry.origin': { value: 'auto.faas.cloudflare.agents', type: 'string' },
+      // Read back off the instance at runtime (`_ParentClass.name`), so it
+      // confirms the wrapper landed on the user's real class. Matched loosely
+      // because the transform renames the class it wraps to
+      // `__SENTRY_ORIGINAL_<name>__` and the bundler infers that name.
+      'gen_ai.agent.name': { value: expect.stringContaining(agentClass), type: 'string' },
+    });
   });
 }
 
 test('applies plain Durable Object instrumentation to a non-Agent class', async ({ baseURL }) => {
-  const transactionPromise = waitForTransaction('cloudflare-autoinstrument', event => {
-    return event.contexts?.trace?.op === 'http.server' && (event.request?.url ?? '').includes('/plain-do');
-  });
+  const spansPromise = collectStreamedSpans('cloudflare-autoinstrument', spans => spans.some(isPlainDoRequestSegment));
 
   const res = await fetch(`${baseURL}/plain-do`);
   expect(res.status).toBe(200);
 
-  const transaction = await transactionPromise;
+  const spans = await spansPromise;
+  const segment = spans.find(isPlainDoRequestSegment)!;
 
   // A plain Durable Object must NOT pick up agent instrumentation: detection has
   // to discriminate, not blanket-upgrade every `durable_objects` binding.
-  const agentSpans = (transaction.spans ?? []).filter(span => span.origin === 'auto.faas.cloudflare.agents');
+  const agentSpans = spans.filter(
+    span =>
+      span.trace_id === segment.trace_id && span.attributes['sentry.origin']?.value === 'auto.faas.cloudflare.agents',
+  );
   expect(agentSpans).toEqual([]);
 });