diff --git a/dist/shimsWorkerd.cjs b/dist/shimsWorkerd.cjs
index 29ef3a5b9872dbc934ec094d7419f6c965808e86..4b2dc3e755e5566edbbfd56087587e5c080ade02 100644
--- a/dist/shimsWorkerd.cjs
+++ b/dist/shimsWorkerd.cjs
@@ -7,7 +7,11 @@ const require_cfWorkerProvider = require('./cfWorkerProvider-B3dvjU3F.cjs');
 *
 * This file is selected via package.json export conditions when running in workerd.
 */
-require_src.preloadSchemas();
+/* executor-patch: no-preload-schemas — the upstream warm-up eagerly builds
+ * both protocol eras' zod schemas (~15MB heap) in EVERY isolate at module
+ * eval; under Cloudflare memory pressure this collapsed isolate reuse
+ * (~5-7 -> ~3 requests/isolate, 2026-08-25 latency incident). Schemas stay
+ * lazy+memoized; the first MCP use in an isolate pays ~15ms CPU instead. */
 /**
 * Whether `fetch()` may throw `TypeError` due to CORS. CORS is a browser-only concept —
 * in Cloudflare Workers, a `TypeError` from `fetch` is always a real network/configuration
diff --git a/dist/shimsWorkerd.mjs b/dist/shimsWorkerd.mjs
index 02d2730aca540adf88d52487ec3f3a9b3f8e80ee..beb9604d2f7f486f711ef4ba7f93a85caf72c2dc 100644
--- a/dist/shimsWorkerd.mjs
+++ b/dist/shimsWorkerd.mjs
@@ -1,4 +1,3 @@
-import { n as preloadSchemas } from "./src-D_zzAWoS.mjs";
 import { t as CfWorkerJsonSchemaValidator } from "./cfWorkerProvider-BylNJ1R5.mjs";
 
 //#region src/shimsWorkerd.ts
@@ -7,7 +6,11 @@ import { t as CfWorkerJsonSchemaValidator } from "./cfWorkerProvider-BylNJ1R5.mj
 *
 * This file is selected via package.json export conditions when running in workerd.
 */
-preloadSchemas();
+/* executor-patch: no-preload-schemas — the upstream warm-up eagerly builds
+ * both protocol eras' zod schemas (~15MB heap) in EVERY isolate at module
+ * eval; under Cloudflare memory pressure this collapsed isolate reuse
+ * (~5-7 -> ~3 requests/isolate, 2026-08-25 latency incident). Schemas stay
+ * lazy+memoized; the first MCP use in an isolate pays ~15ms CPU instead. */
 /**
 * Whether `fetch()` may throw `TypeError` due to CORS. CORS is a browser-only concept —
 * in Cloudflare Workers, a `TypeError` from `fetch` is always a real network/configuration