diff --git a/.changeset/26206-driver-memory-default.md b/.changeset/26206-driver-memory-default.md
new file mode 100644
index 00000000000..ad74310c2ad
--- /dev/null
+++ b/.changeset/26206-driver-memory-default.md
@@ -0,0 +1,18 @@
+---
+'@objectstack/driver-memory': patch
+---
+
+fix(driver-memory)!: retire the legacy `default` export, which a CommonJS `require()` could not reach as its types described
+
+The package entry exported a legacy `{ id, version, onEnable }` object as its `default`. It is not a kernel plugin (the kernel contract is `init` / `start` / `destroy`), and the CommonJS build could only put it on `require('@objectstack/driver-memory').default`, while the published declarations said `export default` (`@arethetypeswrong/cli` reported `FalseExportDefault`). It leaves the published entry. Every named export stays. Nothing in this repository imported the default, and no example, scaffold template, doc page or skill names the package as a string entry of a stack's `plugins` array.
+
+Clause-②: no (narrowing)
+Metadata-protocol: none
+
+<!-- adr-0087: not-required (runtime-export-retired @objectstack/driver-memory#default) One runtime object leaves a published package entry; no key of any metadata schema, no object definition and no stored shape is added, removed, renamed or re-shaped, so there is nothing for `objectstack migrate meta` to rewrite and no tombstone. A TypeScript consumer meets the break at its own import, and the line below names the door to use instead. -->
+
+**BREAKING** (a runtime export is removed). It ships as `patch` because the metadata protocol does not move. There is no staged window.
+
+- FROM `default` TO `new DriverPlugin(new InMemoryDriver(), 'memory')` from `@objectstack/runtime`, or `new InMemoryDriver()` handed to whatever registers your drivers.
+
+A stack config that names `'@objectstack/driver-memory'` as a string entry of `plugins` loaded that object and registered an `InMemoryDriver` through it. After this change that entry loads the module without a default and registers no driver, so put `new DriverPlugin(new InMemoryDriver(), 'memory')` in the `plugins` array instead.
diff --git a/packages/drivers/driver-memory/README.md b/packages/drivers/driver-memory/README.md
index dac154072d5..22059f2727b 100644
--- a/packages/drivers/driver-memory/README.md
+++ b/packages/drivers/driver-memory/README.md
@@ -61,7 +61,6 @@ const driver = new InMemoryDriver({
 
 | Export | Kind | Description |
 |:---|:---|:---|
-| `default` | legacy plugin object | Legacy `onEnable` shape — not a kernel `Plugin`; register through `DriverPlugin`. |
 | `InMemoryDriver` | class | Driver instance for direct use. |
 | `InMemoryStrategy` | class | Query execution strategy used by ObjectQL. |
 | `FileSystemPersistenceAdapter` | class | Node-only persistence. |
@@ -69,6 +68,8 @@ const driver = new InMemoryDriver({
 | `MemoryAnalyticsService` | class | Adds analytics aggregations backed by memory store. |
 | `InMemoryDriverConfig`, `PersistenceAdapterInterface`, `MemoryAnalyticsConfig` | types | Configuration shapes. |
 
+The package has no default export. Register the driver with a named export, as in Quick Start above.
+
 ## Configuration
 
 | Option | Type | Default | Notes |
diff --git a/packages/drivers/driver-memory/src/default-export-retired.pin.test.ts b/packages/drivers/driver-memory/src/default-export-retired.pin.test.ts
new file mode 100644
index 00000000000..a563aa405fd
--- /dev/null
+++ b/packages/drivers/driver-memory/src/default-export-retired.pin.test.ts
@@ -0,0 +1,31 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * The package entry carries no `default` export (ADR-0087
+ * `runtime-export-retired @objectstack/driver-memory#default`).
+ *
+ * The retired object was the legacy `{ id, version, onEnable }` shape, which is
+ * not a kernel `Plugin`, and the CJS build could only reach it as
+ * `require(...).default` while the published declarations said `export default`
+ * (attw `FalseExportDefault`). The named exports are the supported surface.
+ *
+ * Pinned both ways: the entry has no `default`, and the named door the
+ * changeset points readers to still constructs a working driver.
+ */
+
+import { describe, it, expect } from 'vitest';
+import * as entry from './index.js';
+
+describe('driver-memory entry: the legacy default export is retired', () => {
+  it('the published entry has no default export', () => {
+    expect('default' in entry).toBe(false);
+  });
+
+  it('the named exports stay, and InMemoryDriver still constructs a driver', () => {
+    for (const name of ['InMemoryDriver', 'InMemoryStrategy', 'MemoryAnalyticsService', 'FileSystemPersistenceAdapter', 'LocalStoragePersistenceAdapter']) {
+      expect(typeof (entry as Record<string, unknown>)[name]).toBe('function');
+    }
+    const driver = new entry.InMemoryDriver();
+    expect(driver.name).toBe('com.objectstack.driver.memory');
+  });
+});
diff --git a/packages/drivers/driver-memory/src/index.ts b/packages/drivers/driver-memory/src/index.ts
index 1b09e989e8a..a1f49a03fbd 100644
--- a/packages/drivers/driver-memory/src/index.ts
+++ b/packages/drivers/driver-memory/src/index.ts
@@ -61,20 +61,10 @@ export type {
   UniqueAwareSchema,
 } from './memory-unique-constraint.js';
 
-export default {
-  id: 'com.objectstack.driver.memory',
-  version: '1.0.0',
-
-  onEnable: async (context: any) => {
-    const { logger, config, drivers } = context;
-    logger.info('[Memory Driver] Initializing...');
-
-    if (drivers) {
-       const driver = new InMemoryDriver(config);
-       drivers.register(driver);
-       logger.info(`[Memory Driver] Registered driver: ${driver.name}`);
-    } else {
-       logger.warn('[Memory Driver] No driver registry found in context.');
-    }
-  }
-};
+// [ADR-0087 runtime-export-retired] This entry has NO default export, on
+// purpose. The legacy `{ id, version, onEnable }` object it once carried was not
+// a kernel `Plugin` (the contract is init/start/destroy), and the package's CJS
+// build could only place it on `require(...).default`, which the published
+// `.d.ts` misdescribed (attw `FalseExportDefault`). Register this driver through
+// a named export: `new DriverPlugin(new InMemoryDriver(), 'memory')`
+// (`@objectstack/runtime`), or construct `InMemoryDriver` directly.