@@ -0,0 +1,18 @@
+---
+'@objectstack/runtime': patch
+'@objectstack/client': patch
+'@objectstack/cli': patch
+'@objectstack/spec': patch
+---
+
+feat(runtime,client,cli): export a deployment's whole ontology as installable packages in one read (`GET /packages/export`, `os package export`)
+
+Clause-②: yes (widening)
+Metadata-protocol: none
+
+A tenant could take its ontology out of a deployment only one package at a time (`GET /packages/:id/export`). The whole-deployment export declared in `@objectstack/spec` (`PackageExportBundleSchema`) is now served.
+
+- **`@objectstack/runtime`**: `GET /api/v1/packages/export` answers `{ packages }`: every installed package whose registry row's `source` is not `code` (the marketplace and authored packages, each base's `.custom` pair among them), disabled ones included, each exactly as `GET /packages/:id/export` answers it, dependencies first, so a pair follows its base. It reads with the per-package export's gate (`studio.access` or `setup.access`), refuses any query parameter `400 VALIDATION_ERROR` naming it, and is whole or absent: a package whose export cannot be assembled fails the read, naming that package. No credential value is carried: credential positions are withheld as on every served metadata read, and a connector's `credentialRef` stays a reference.
+- **`@objectstack/client`**: `client.packages.exportAll()` calls it.
+- **`@objectstack/cli`**: `os package export [--out DIR]` writes one directory per package, numbered in install order (`DIR/01-ID/objectstack.json`), each installable with `os package install`. A refusal is printed with its status and code and nothing is written; an `--out` directory that already holds files is refused.
+- **`@objectstack/spec`**: the `[PLANNED — not yet served]` marker comes off `PackageExportBundleSchema`'s description, which now names the route and the command.
@@ -158,7 +158,9 @@ document **whole** for every read that serves the base's name
   layered read in `overlay` with `effective` = the base's document.
 - **Export carries the declaration.** `GET /packages/hotcrm.custom/export` carries the
   overriding item with its `overrides` block; `GET /packages/hotcrm/export` carries the
-  base unchanged.
+  base unchanged. `GET /packages/export` (`os package export`) answers the whole
+  deployment in one read: every installed package its own code does not register, the
+  pair as its own entry after its base, each entry exactly the per-package export.
 
 ## Overlay whitelist (shared-DB tenancy invariant)
 
 
@@ -2995,6 +2995,7 @@ runtime**.
 |---------|----------|-------------|
 | `os package publish [artifact]` | ObjectOS Cloud | Upload a compiled artifact as a versioned package in your organization |
 | `os package install <package>` | A running runtime | Install a package into a live kernel, from that runtime's catalog or from a local artifact |
+| `os package export` | A running runtime | Export the deployment's whole ontology as installable packages, one directory per package, in install order |
 
 For which one to reach for and the preview patterns around them, see
 [Publish & preview](/docs/deployment/publish-and-preview). This section is the
@@ -3189,6 +3190,54 @@ composed without it will not accept installs.
 
 In catalog mode, a runtime connected to an ObjectOS Cloud account presents its connection credential to the cloud catalog — see [Cloud Connection](/docs/deployment/cloud-connection).
 
+#### `os package export`
+
+Takes a running deployment's whole ontology out as packages you can install on
+any runtime, the open Apache-2.0 one included. One read,
+`GET /api/v1/packages/export`, answers every installed package the deployment's
+own code does not register: the marketplace and authored packages, each base's
+`.custom` customization package among them. Each comes exactly as
+`GET /api/v1/packages/:id/export` answers it, with the namespace and
+dependencies it was installed with, and dependencies come first, so a `.custom`
+package follows its base. A package registered by the deployment's own code
+(`defineStack()`, a plugin, the platform) is not exported: it travels with that
+code.
+
+```bash
+os package export --out ./ontology --url https://acme.example.com
+# ./ontology/01-com.acme.crm/objectstack.json
+# ./ontology/02-com.acme.crm.custom/objectstack.json
+# ./ontology/03-com.acme.billing/objectstack.json
+
+# on the target runtime, in the numbered order:
+os package install ./ontology/01-com.acme.crm/objectstack.json
+os package install ./ontology/02-com.acme.crm.custom/objectstack.json
+os package install ./ontology/03-com.acme.billing/objectstack.json
+```
+
+Each file is one package's export, installable as it stands with
+[`os package install`](#os-package-install). Install them in the numbered order;
+the command prints that order too, and never re-sorts what the read answered.
+
+- **No secret leaves.** Credential positions are withheld, as on every served
+  metadata read, and a connector's `auth.credentialRef` stays the reference it
+  is: fill the secret it names on the target runtime.
+- **No enabled state.** Every package installs enabled, including one that was
+  switched off where it was exported.
+- **Whole or nothing.** A package whose export cannot be assembled fails the
+  read, and the command prints the runtime's refusal, which names the package,
+  and writes nothing. It refuses an `--out` directory that already holds files.
+- **Who can export.** The same callers who can read a single package's export:
+  `studio.access` or `setup.access`.
+
+**Options:**
+
+| Flag | Env equivalent | Purpose |
+|---|---|---|
+| `-o, --out <dir>` | — | Directory to write into (default `./objectstack-export`); created, and refused when it already holds files |
+| `-u, --url <url>` | `OS_CLOUD_URL` | Server URL of the deployment to export (default: the stored `os login` session's, else `http://localhost:3000`) |
+| `-t, --token <token>` | `OS_TOKEN` | Authentication token (default: the stored `os login` session's) |
+
 ## Configuration
 
 The CLI looks for `objectstack.config.ts` (or `.js`, `.mjs`) in the current directory:
 
@@ -317,7 +317,7 @@ A navigation item another installed package contributes to an app the base owns,
 
 ## PackageExportBundle
 
-[PLANNED — not yet served] Whole-deployment export: every installed package the deployment's own code does not register (registry `source` other than `code`), as installable packages in dependency order. Carries no credential value and no enabled state. Declared ahead of its producer (ADR-0049): no runtime serves `GET /packages/export` yet. The server half of the whole-deployment package export mounts it, together with a future CLI command that calls it; until then this is the contract that door must answer, not a read a client can make.
+Whole-deployment export, the answer of `GET /packages/export` (`os package export`): every installed package the deployment's own code does not register (registry `source` other than `code`), as installable packages in dependency order. Carries no credential value and no enabled state. A package whose export cannot be assembled fails the whole read, naming it.
 
 ### Properties
 
 
@@ -0,0 +1,156 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * `objectstack package export` — take a running deployment's whole ontology
+ * out as installable packages (#28914).
+ *
+ *   os package export [--out DIR]
+ *
+ * One read, `GET /api/v1/packages/export` (`client.packages.exportAll()`,
+ * `PackageExportBundleSchema`): every installed package the deployment's own
+ * code does not register — the marketplace and authored packages, each base's
+ * `.custom` pair among them — each exactly as `GET /packages/:id/export`
+ * answers it, dependencies first. This command writes them as they came, one
+ * directory per package, numbered in that order:
+ *
+ *   DIR/01-com.acme.crm/objectstack.json
+ *   DIR/02-com.acme.crm.custom/objectstack.json
+ *
+ * Each file is the package's export, and each is installable as it stands with
+ * `os package install DIR/NN-ID/objectstack.json` on an open runtime. Install
+ * them in the numbered order: the order is the read's, and this command never
+ * re-sorts it.
+ *
+ * Loud, never partial: the read is whole or absent (a package whose export
+ * cannot be assembled fails it, and the runtime's refusal names that package),
+ * and this command prints that refusal with its status and code and writes
+ * nothing. It refuses an `--out` directory that already holds files, so an
+ * export is never mixed into an older one.
+ *
+ * No credential value travels: the runtime withholds credential positions on
+ * this read as on every served metadata read, and a connector's
+ * `credentialRef` stays the reference it is.
+ */
+
+import { mkdir, readdir, writeFile } from 'node:fs/promises';
+import { join, resolve as resolvePath } from 'node:path';
+import { Command, Flags } from '@oclif/core';
+import { printHeader, printKV, printSuccess, printWarning, printError, printStep, isExitSignal } from '../../utils/format.js';
+import { createApiClient, requireAuth } from '../../utils/api-client.js';
+
+/** The file each package directory holds: the name `os package install` is shown first in its examples. */
+export const EXPORTED_PACKAGE_FILE = 'objectstack.json';
+
+/** `NN-ID`: the package's place in the read's order, zero-padded so a listing sorts in install order. */
+export function exportedPackageDirectory(index: number, total: number, id: string): string {
+  const width = Math.max(2, String(total).length);
+  return `${String(index + 1).padStart(width, '0')}-${id}`;
+}
+
+export default class PackageExport extends Command {
+  static override description =
+    "Export a running deployment's whole ontology as installable packages (one directory per package, in install order)";
+
+  static override examples = [
+    '$ os package export',
+    '$ os package export --out ./ontology --url https://acme.objectos.app',
+    '$ os package install ./ontology/01-com.acme.crm/objectstack.json   # then each directory, in order',
+  ];
+
+  static override flags = {
+    out: Flags.string({
+      char: 'o',
+      description: 'Directory to write the packages into (created; refused when it already holds files)',
+      default: './objectstack-export',
+    }),
+    url: Flags.string({
+      char: 'u',
+      description: 'Server URL of the deployment to export',
+      env: 'OS_CLOUD_URL',
+    }),
+    token: Flags.string({
+      char: 't',
+      description: 'Authentication token',
+      env: 'OS_TOKEN',
+    }),
+  };
+
+  async run(): Promise<void> {
+    const { flags } = await this.parse(PackageExport);
+
+    printHeader('Export Packages');
+    const outDir = resolvePath(process.cwd(), flags.out);
+
+    try {
+      const existing = await readdir(outDir).catch((err: NodeJS.ErrnoException) => {
+        if (err?.code === 'ENOENT') return [] as string[];
+        throw err;
+      });
+      if (existing.length > 0) {
+        printError(`${outDir} already holds files. Export into a new or empty directory (--out DIR).`);
+        this.exit(1);
+        return;
+      }
+
+      const { client, token, baseUrl } = await createApiClient({ url: flags.url, token: flags.token });
+      requireAuth(token);
+
+      printStep(`Reading the whole-deployment export from ${baseUrl}...`);
+      let bundle: unknown;
+      try {
+        bundle = await client.packages.exportAll();
+      } catch (err: any) {
+        const status = typeof err?.httpStatus === 'number' ? err.httpStatus : undefined;
+        const code = typeof err?.code === 'string' ? err.code : undefined;
+        const tag = [status, code].filter((v) => v !== undefined).join(' ');
+        printError(`Export refused${tag ? ` (${tag})` : ''}: ${err?.message ?? String(err)}. Nothing was written.`);
+        this.exit(1);
+        return;
+      }
+
+      const packages = (bundle as { packages?: unknown } | null | undefined)?.packages;
+      if (!Array.isArray(packages)) {
+        printError('The runtime answered no `packages` list: it does not serve the whole-deployment export. Nothing was written.');
+        this.exit(1);
+        return;
+      }
+      const nameless = packages.findIndex(
+        (entry) => typeof (entry as { id?: unknown } | null)?.id !== 'string' || (entry as { id: string }).id === '',
+      );
+      if (nameless !== -1) {
+        printError(`Entry ${nameless + 1} of the export names no package id, so it cannot be installed. Nothing was written.`);
+        this.exit(1);
+        return;
+      }
+      if (packages.length === 0) {
+        printWarning(
+          'Nothing to export: every package of this deployment is registered by its own code, which carries it. Nothing was written.',
+        );
+        return;
+      }
+
+      await mkdir(outDir, { recursive: true });
+      const written: string[] = [];
+      for (const [index, entry] of packages.entries()) {
+        const id = (entry as { id: string }).id;
+        const dir = join(outDir, exportedPackageDirectory(index, packages.length, id));
+        await mkdir(dir, { recursive: true });
+        const file = join(dir, EXPORTED_PACKAGE_FILE);
+        await writeFile(file, `${JSON.stringify(entry, null, 2)}\n`, 'utf-8');
+        written.push(file);
+      }
+
+      console.log('');
+      printSuccess(`Exported ${packages.length} package${packages.length === 1 ? '' : 's'}`);
+      printKV('  Directory', outDir);
+      console.log('');
+      console.log('  Install them on an open runtime in this order:');
+      for (const file of written) console.log(`    os package install ${file}`);
+      console.log('');
+    } catch (error) {
+      if (isExitSignal(error)) throw error;
+      printError((error as Error).message);
+      this.exit(1);
+    }
+  }
+}
@@ -55,6 +55,7 @@ export { default as CloudWhoamiCommand } from './commands/cloud/whoami.js';
 // ─── Package topic subcommands ──────────────────────────────────────
 export { default as PackagePublishCommand } from './commands/package/publish.js';
 export { default as PackageInstallCommand } from './commands/package/install.js';
+export { default as PackageExportCommand } from './commands/package/export.js';
 
 // ─── Entry-point guard (#10111) ─────────────────────────────────────
 // This file is the package `main`. It is a LIBRARY entry — a barrel of