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diff --git a/‎packages/cli/test/package-install-local-handlers.integration.test.ts‎
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@@ -0,0 +1,12 @@
+---
+'@objectstack/runtime': minor
+'@objectstack/cloud-connection': patch
+---
+
+An app installed with `os package install <artifact>` now runs its `type: 'script'` action bodies and its body hooks, and MCP `list_actions` lists a script action only when `run_action` can run it (#21321).
+
+Clause-②: yes (widening)
+
+- **`@objectstack/runtime`.** New export `bindAppArtifactHandlers(ql, bundle, { appId, logger, source? })`. It binds every action `body` of an artifact through `ql.registerAction`, and every hook `body` and bundle function through `ql.bindHooks`, all under the owner `app:<appId>`. `appArtifactHandlerOwner(appId)` returns that owner key. Each call first removes the action handlers and hooks the same owner bound before. A reinstall therefore leaves one handler per action, and an action or hook that the new version dropped stops running. `AppPlugin.start` now binds through this function, with the same log lines and the same results for a boot artifact.
+- **`@objectstack/runtime`, MCP `list_actions`.** A `script` action is listed only when the engine has a handler registered for it. The check reads `listRegisteredActions()` and uses the same object and key order as `run_action`. Before, a declared `target` or `body` was enough to be listed, so `list_actions` could list an action that `run_action` refused with "No handler registered". An engine without `listRegisteredActions` gets no script actions listed. Declarative update actions and `flow` actions are listed as before.
+- **`@objectstack/cloud-connection`.** The install-local plugin calls `bindAppArtifactHandlers` on `POST /api/v1/marketplace/install-local` and when it rehydrates its ledger at `kernel:ready`. Before, an installed package's script actions answered REST `404 RESOURCE_NOT_FOUND` and MCP "No handler registered", before and after a restart, and its body hooks never ran. The same artifact booted with `os start --artifact` was not affected.
@@ -0,0 +1,246 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * #21321 — an installed package's script-action bodies and body hooks are
+ * BOUND, on the install route and on the `kernel:ready` rehydrate, through the
+ * same runtime function `AppPlugin.start` uses for a boot artifact.
+ *
+ * The defect: `os package install <artifact>` registered the package's metadata
+ * and nothing executable. Every door refused the installed `type: 'script'`
+ * action (REST 404, MCP `run_action` "No handler registered") before and after
+ * a restart, and its body hooks never fired — while `os start --artifact` of the
+ * same file dispatched normally, because `AppPlugin.start` was the only binder.
+ *
+ * What this file pins, against the engine-level outcome rather than a call:
+ *
+ *   - install: the action handler is registered under `app:<manifestId>` and
+ *     the body hook is handed to `bindHooks` under the same owner;
+ *   - rehydrate: a ledger entry written by an earlier process binds the same
+ *     way when a fresh plugin reaches `kernel:ready`;
+ *   - reinstall: still exactly one handler per action and one binding per hook;
+ *   - reinstall of a version that DROPPED its action and its hook: neither
+ *     stays bound — the owner's previous set is torn down first.
+ *
+ * The binder is the REAL `@objectstack/runtime` export (resolved through its
+ * `exports`, i.e. its built `dist/`, like the plugin's own lazy import); the
+ * engine is a recording double that models only what the binder touches —
+ * including `bindHooksToEngine`'s own rule of unregistering a package's hooks
+ * only when handed a NON-empty list, which is what the dropped-hook case reads.
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { mkdtempSync, rmSync } from 'node:fs';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
+// The first load of the runtime's dist paid at module top, never inside a
+// clocked `it` (the clocked-window rule, `scripts/check-test-source-alias.mjs`):
+// the plugin reaches the same module through a dynamic `import()`.
+import '@objectstack/runtime';
+import { MarketplaceInstallLocalPlugin } from './marketplace-install-local-plugin.js';
+import { installerAuthService, withInstallerGrants } from './install-local-principal.fixtures.js';
+import { LocalManifestSource } from './local-manifest-source.js';
+
+const APP_ID = 'com.example.tasksapp';
+const OWNER = `app:${APP_ID}`;
+
+const ACTION = {
+    name: 'complete_task',
+    label: 'Complete Task',
+    objectName: 'tasks_app_task',
+    type: 'script',
+    body: { language: 'js', capabilities: ['api.write'], source: 'return { ok: true };' },
+    ai: { exposed: true, description: 'Mark a task as complete.' },
+};
+const HOOK = {
+    name: 'tasks_app_stamp_status',
+    object: 'tasks_app_task',
+    events: ['beforeInsert'],
+    body: { language: 'js', source: "ctx.input.status = 'stamped';" },
+};
+
+/** The compiled-artifact shape `os build` writes and `os package install` sends. */
+function artifact(version: string, opts: { withHandlers: boolean }) {
+    return {
+        manifest: { id: APP_ID, namespace: 'tasks_app', version, type: 'app', name: 'Tasks App' },
+        objects: [{
+            name: 'tasks_app_task',
+            label: 'Task',
+            fields: { name: { type: 'text', label: 'Name' } },
+            ...(opts.withHandlers ? { actions: [ACTION] } : {}),
+        }],
+        ...(opts.withHandlers ? { actions: [ACTION], hooks: [HOOK] } : {}),
+    };
+}
+
+/** The install route's normalization of a compiled bundle, as it lands in the ledger. */
+function flattened(bundle: ReturnType<typeof artifact>) {
+    const { manifest: meta, ...sections } = bundle;
+    return { ...meta, ...sections };
+}
+
+/**
+ * The engine surface the binder writes to, as state: an action Map keyed
+ * `<object>:<name>` (the engine's own key) and one hook list.
+ */
+function recordingEngine() {
+    const actions = new Map<string, { handler: unknown; package?: string }>();
+    let hooks: Array<{ name: string; packageId?: string }> = [];
+    const unregisterHooksByPackage = (packageId: string): number => {
+        const before = hooks.length;
+        hooks = hooks.filter((h) => h.packageId !== packageId);
+        return before - hooks.length;
+    };
+    return {
+        actions,
+        hooksFor: (packageId: string) => hooks.filter((h) => h.packageId === packageId),
+        engine: {
+            syncSchemas: async () => undefined,
+            registerAction: (object: string, name: string, handler: unknown, pkg?: string) => {
+                actions.set(`${object}:${name}`, { handler, package: pkg });
+            },
+            removeActionsByPackage: (pkg: string) => {
+                for (const [key, entry] of actions) if (entry.package === pkg) actions.delete(key);
+            },
+            listRegisteredActions: () =>
+                [...actions].map(([key, entry]) => ({
+                    objectName: key.slice(0, key.indexOf(':')),
+                    actionName: key.slice(key.indexOf(':') + 1),
+                    ...(entry.package ? { package: entry.package } : {}),
+                })),
+            unregisterHooksByPackage,
+            // `bindHooksToEngine`'s own teardown fires only for a NON-empty list.
+            bindHooks: (list: Array<{ name: string }> | undefined, opts?: { packageId?: string; bodyRunner?: unknown }) => {
+                if (!Array.isArray(list) || list.length === 0) return;
+                if (opts?.packageId) unregisterHooksByPackage(opts.packageId);
+                expect(typeof opts?.bodyRunner, 'a body hook needs the sandbox runner').toBe('function');
+                for (const h of list) hooks.push({ name: h.name, packageId: opts?.packageId });
+            },
+        },
+    };
+}
+
+type Handler = (c: any) => Promise<any>;
+
+function makeRawApp() {
+    const routes = new Map<string, Handler>();
+    return {
+        routes,
+        get: (p: string, h: Handler) => routes.set(`GET ${p}`, h),
+        post: (p: string, h: Handler) => routes.set(`POST ${p}`, h),
+        delete: (p: string, h: Handler) => routes.set(`DELETE ${p}`, h),
+    };
+}
+
+function makeCtx(rawApp: any, services: Record<string, any>) {
+    const hooks = new Map<string, any>();
+    const logger = { info: vi.fn(), warn: vi.fn(), error: vi.fn(), debug: vi.fn() };
+    return {
+        logger,
+        ctx: {
+            hook: (e: string, h: any) => hooks.set(e, h),
+            getService: (name: string) => {
+                if (name === 'http-server') return { getRawApp: () => rawApp };
+                const svc = services[name];
+                if (svc === undefined) throw new Error(`no ${name}`);
+                return svc;
+            },
+            logger,
+        },
+        fire: async () => { await hooks.get('kernel:ready')?.(); },
+    };
+}
+
+function makeC(body: any) {
+    const json = vi.fn((payload: any, status?: number) => ({ payload, status: status ?? 200 }));
+    return {
+        req: {
+            url: 'http://localhost:3000/api/v1/marketplace/install-local',
+            raw: new Request('http://localhost:3000/x'),
+            json: async () => body,
+            param: () => undefined,
+        },
+        json,
+    };
+}
+
+let dir: string;
+beforeEach(() => { dir = mkdtempSync(join(tmpdir(), 'mil-handlers-')); });
+afterEach(() => { rmSync(dir, { recursive: true, force: true }); vi.restoreAllMocks(); });
+
+async function bootPlugin(engine: Record<string, unknown>) {
+    const rawApp = makeRawApp();
+    const { ctx, fire, logger } = makeCtx(rawApp, {
+        manifest: { register: vi.fn() },
+        auth: installerAuthService(),
+        objectql: withInstallerGrants(engine),
+    });
+    const plugin = new MarketplaceInstallLocalPlugin({ controlPlaneUrl: 'off', storageDir: dir });
+    await plugin.start(ctx as any);
+    await fire();
+    const install = async (body: unknown) => {
+        const res = await rawApp.routes.get('POST /api/v1/marketplace/install-local')!(makeC({ manifest: body }));
+        expect(res.payload?.success, JSON.stringify(res.payload)).toBe(true);
+        return res;
+    };
+    return { install, logger };
+}
+
+describe('#21321: install-local binds an installed package’s handlers', () => {
+    it('install — the script action is registered and the body hook is bound, both under app:<manifestId>', async () => {
+        const rec = recordingEngine();
+        const { install } = await bootPlugin(rec.engine);
+
+        await install(artifact('0.1.0', { withHandlers: true }));
+
+        const entry = rec.actions.get('tasks_app_task:complete_task');
+        expect(entry, 'the installed script action has no handler — every door refuses it').toBeDefined();
+        expect(entry!.package).toBe(OWNER);
+        expect(typeof entry!.handler).toBe('function');
+        expect(rec.hooksFor(OWNER).map((h) => h.name)).toEqual(['tasks_app_stamp_status']);
+    });
+
+    it('rehydrate — a ledger entry from an earlier process is bound at kernel:ready', async () => {
+        new LocalManifestSource(dir).write({
+            packageId: APP_ID,
+            versionId: 'local',
+            manifestId: APP_ID,
+            version: '0.1.0',
+            // What the install route persists: the compiled bundle, flattened
+            // (its `manifest` meta lifted to the top level beside the sections).
+            manifest: flattened(artifact('0.1.0', { withHandlers: true })),
+            installedAt: '2026-01-01T00:00:00.000Z',
+            installedBy: 'admin',
+            withSampleData: false,
+        });
+        const rec = recordingEngine();
+        await bootPlugin(rec.engine);
+
+        expect(rec.actions.get('tasks_app_task:complete_task')?.package, 'a restart leaves the installed action unbound').toBe(OWNER);
+        expect(rec.hooksFor(OWNER).map((h) => h.name)).toEqual(['tasks_app_stamp_status']);
+    });
+
+    it('reinstall — still exactly one handler per action and one binding per hook', async () => {
+        const rec = recordingEngine();
+        const { install } = await bootPlugin(rec.engine);
+
+        await install(artifact('0.1.0', { withHandlers: true }));
+        await install(artifact('0.1.0', { withHandlers: true }));
+
+        const owned = rec.engine.listRegisteredActions().filter((r) => r.package === OWNER);
+        expect(owned).toEqual([{ objectName: 'tasks_app_task', actionName: 'complete_task', package: OWNER }]);
+        expect(rec.hooksFor(OWNER)).toHaveLength(1);
+    });
+
+    it('reinstall of a version that dropped its action and hook — neither stays bound', async () => {
+        const rec = recordingEngine();
+        const { install } = await bootPlugin(rec.engine);
+
+        await install(artifact('0.1.0', { withHandlers: true }));
+        expect(rec.actions.size, 'precondition: the first version bound its action').toBe(1);
+
+        await install(artifact('0.2.0', { withHandlers: false }));
+
+        expect(rec.engine.listRegisteredActions().filter((r) => r.package === OWNER)).toEqual([]);
+        expect(rec.hooksFor(OWNER), 'a hook the new version dropped must stop firing').toEqual([]);
+    });
+});
@@ -12,6 +12,11 @@ import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
 import { mkdtempSync, rmSync } from 'node:fs';
 import { join } from 'node:path';
 import { tmpdir } from 'node:os';
+// [#21321] An install, and a rehydrate of a ledger entry, now bind the package's
+// handlers through `@objectstack/runtime` (a lazy `import()` inside the plugin).
+// Its first load is paid here, at module top — never inside a clocked `it`
+// (the clocked-window rule, `scripts/check-test-source-alias.mjs`).
+import '@objectstack/runtime';
 import { MarketplaceInstallLocalPlugin } from './marketplace-install-local-plugin.js';
 import { installerAuthService, withInstallerGrants } from './install-local-principal.fixtures.js';
 
 
@@ -14,6 +14,11 @@ import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
 import { mkdtempSync, rmSync, readdirSync } from 'node:fs';
 import { join } from 'node:path';
 import { tmpdir } from 'node:os';
+// [#21321] An install, and a rehydrate of a ledger entry, now bind the package's
+// handlers through `@objectstack/runtime` (a lazy `import()` inside the plugin).
+// Its first load is paid here, at module top — never inside a clocked `it`
+// (the clocked-window rule, `scripts/check-test-source-alias.mjs`).
+import '@objectstack/runtime';
 import { MarketplaceInstallLocalPlugin } from './marketplace-install-local-plugin.js';
 import { installerAuthService, withInstallerGrants } from './install-local-principal.fixtures.js';
 
 
@@ -38,6 +38,11 @@ import { join } from 'node:path';
 import { tmpdir } from 'node:os';
 import { manifestIdRefusal } from '@objectstack/spec/kernel';
 import { BaseResponseSchema, ApiErrorSchema, envelopeViolations } from '@objectstack/spec/api';
+// [#21321] An install, and a rehydrate of a ledger entry, now bind the package's
+// handlers through `@objectstack/runtime` (a lazy `import()` inside the plugin).
+// Its first load is paid here, at module top — never inside a clocked `it`
+// (the clocked-window rule, `scripts/check-test-source-alias.mjs`).
+import '@objectstack/runtime';
 import { MarketplaceInstallLocalPlugin } from './marketplace-install-local-plugin.js';
 import { LocalManifestSource } from './local-manifest-source.js';
 import { installerAuthService, withInstallerGrants } from './install-local-principal.fixtures.js';
 
@@ -62,6 +62,11 @@ import { mkdtempSync, rmSync } from 'node:fs';
 import { join } from 'node:path';
 import { tmpdir } from 'node:os';
 
+// [#21321] An install, and a rehydrate of a ledger entry, now bind the package's
+// handlers through `@objectstack/runtime` (a lazy `import()` inside the plugin).
+// Its first load is paid here, at module top — never inside a clocked `it`
+// (the clocked-window rule, `scripts/check-test-source-alias.mjs`).
+import '@objectstack/runtime';
 import { MarketplaceInstallLocalPlugin } from './marketplace-install-local-plugin.js';
 import { LocalManifestSource } from './local-manifest-source.js';
 
 
@@ -28,6 +28,11 @@ import { mkdtempSync, rmSync } from 'node:fs';
 import { join } from 'node:path';
 import { tmpdir } from 'node:os';
 
+// [#21321] An install, and a rehydrate of a ledger entry, now bind the package's
+// handlers through `@objectstack/runtime` (a lazy `import()` inside the plugin).
+// Its first load is paid here, at module top — never inside a clocked `it`
+// (the clocked-window rule, `scripts/check-test-source-alias.mjs`).
+import '@objectstack/runtime';
 import { MarketplaceInstallLocalPlugin } from './marketplace-install-local-plugin.js';
 import { installerAuthService, withInstallerGrants } from './install-local-principal.fixtures.js';