diff --git a/.changeset/mcp-standalone-authored-actions.md b/.changeset/mcp-standalone-authored-actions.md
new file mode 100644
index 0000000000..cc11c5e4c0
--- /dev/null
+++ b/.changeset/mcp-standalone-authored-actions.md
@@ -0,0 +1,5 @@
+---
+'@objectstack/runtime': patch
+---
+
+Surface standalone authored `action` metadata rows on the MCP action bridge (#3010). `list_actions` and `run_action` now resolve declarations from `object.actions` unioned with standalone `action` items, keyed the same way the engine registers their handlers (`objectName` → legacy `object` → `'global'`), with object-embedded declarations winning on a key clash. Previously a Studio-authored standalone action executed via REST but was invisible and uninvokable on the MCP/AI surface, even with `ai.exposed: true`. All invoke-time gates (`ai.exposed` fail-closed, ADR-0066 D4 capability gate, sys_* fail-closed) are unchanged.
diff --git a/packages/runtime/src/http-dispatcher.test.ts b/packages/runtime/src/http-dispatcher.test.ts
index c8e39a9b18..3f13887832 100644
--- a/packages/runtime/src/http-dispatcher.test.ts
+++ b/packages/runtime/src/http-dispatcher.test.ts
@@ -2718,4 +2718,131 @@ describe('HttpDispatcher — MCP action bridge (list_actions / run_action)', ()
     const { bridge } = makeFlowBridge({ userId: 'u1', systemPermissions: [] }, { execute });
     await expect(bridge.runAction('escalate_ticket', {})).rejects.toThrow(/boom/i);
   });
+
+  // ── standalone authored `action` rows (#3010) ──
+  // Studio-authored standalone `action` metadata items execute since #2608
+  // (`resyncAuthoredActions` registers their body under the declarative name),
+  // but the bridge used to read declarations only from `object.actions`, so
+  // they were invisible to list_actions and unresolvable by run_action.
+  const standaloneScoped = {
+    name: 'archive_task',
+    label: 'Archive',
+    objectName: 'todo_task',
+    type: 'script',
+    body: { language: 'js', source: 'ctx.record.archived = true;' },
+    locations: ['record_header'],
+    params: [{ name: 'reason', type: 'text', required: true }],
+    ai: { exposed: true, description: 'Archive a completed todo task.' },
+  };
+  const standaloneGlobal = {
+    name: 'nightly_cleanup',
+    label: 'Nightly Cleanup',
+    type: 'script',
+    body: { language: 'js', source: 'return 1;' },
+    ai: { exposed: true, description: 'Purge stale drafts.' },
+  };
+  const standaloneUnexposed = {
+    name: 'raw_reindex',
+    objectName: 'todo_task',
+    type: 'script',
+    body: { language: 'js', source: 'return 1;' },
+  };
+  const standaloneOnSysObject = {
+    name: 'rotate_all',
+    objectName: 'sys_api_key',
+    type: 'script',
+    body: { language: 'js', source: 'return 1;' },
+    ai: { exposed: true },
+  };
+  // Same key as the embedded `complete_task` declaration — the embedded one wins.
+  const standaloneShadowing = {
+    name: 'complete_task',
+    objectName: 'todo_task',
+    type: 'script',
+    body: { language: 'js', source: 'return 1;' },
+    ai: { exposed: true, description: 'SHADOW — must not surface.' },
+  };
+
+  const makeStandaloneBridge = (execCtx: any, standaloneRows: any[]) => {
+    const executeAction = vi.fn(async (obj: string, key: string) => {
+      if (obj === 'todo_task' && key === 'archive_task') return { archived: true };
+      if (obj === 'global' && key === 'nightly_cleanup') return { purged: 3 };
+      if (key === 'completeTask') return { updated: true };
+      throw new Error(`Action '${key}' on object '${obj}' not found`);
+    });
+    const ql: any = {
+      executeAction,
+      registry: { getObject: (n: string) => (n === 'todo_task' ? todoObject : null) },
+      insert: vi.fn(), update: vi.fn(), delete: vi.fn(),
+      find: vi.fn(async () => []),
+    };
+    const metadata: any = {
+      listObjects: vi.fn(async () => [todoObject, sysObject]),
+      getObject: vi.fn(async (n: string) => (n === 'todo_task' ? todoObject : undefined)),
+      loadMany: vi.fn(async (type: string) => (type === 'action' ? standaloneRows : [])),
+    };
+    const kernel: any = {
+      context: { getService: (n: string) => (n === 'objectql' ? ql : n === 'metadata' ? metadata : null) },
+    };
+    const dispatcher = new HttpDispatcher(kernel);
+    const ctx: any = { request: {}, environmentId: 'platform', executionContext: execCtx };
+    return { bridge: (dispatcher as any).buildMcpBridge(ctx), executeAction, metadata };
+  };
+
+  it('list_actions surfaces standalone authored rows — object-scoped and global — under the engine-key object name', async () => {
+    const { bridge } = makeStandaloneBridge({ userId: 'u1', systemPermissions: [] }, [
+      standaloneScoped, standaloneGlobal, standaloneUnexposed, standaloneOnSysObject,
+    ]);
+    const actions = await bridge.listActions();
+    const archive = actions.find((a: any) => a.name === 'archive_task');
+    expect(archive).toMatchObject({ objectName: 'todo_task', type: 'script' });
+    expect(archive.params).toEqual([expect.objectContaining({ name: 'reason', required: true })]);
+    expect(actions.find((a: any) => a.name === 'nightly_cleanup')).toMatchObject({ objectName: 'global' });
+    const names = actions.map((a: any) => a.name);
+    expect(names).not.toContain('raw_reindex'); // ai.exposed absent → hidden (#2849)
+    expect(names).not.toContain('rotate_all'); // sys_* owner → hidden fail-closed
+  });
+
+  it('list_actions dedupes a standalone row that shadows an object-embedded declaration (embedded wins)', async () => {
+    const { bridge } = makeStandaloneBridge({ userId: 'u1', systemPermissions: [] }, [standaloneShadowing]);
+    const matches = (await bridge.listActions()).filter((a: any) => a.name === 'complete_task');
+    expect(matches).toHaveLength(1);
+    expect(matches[0].description).not.toMatch(/SHADOW/);
+  });
+
+  it('run_action dispatches a standalone body action under its declarative name key', async () => {
+    const { bridge, executeAction } = makeStandaloneBridge({ userId: 'u1', systemPermissions: [] }, [standaloneScoped]);
+    const res = await bridge.runAction('archive_task', { params: { reason: 'done' } });
+    expect(res.ok).toBe(true);
+    expect(executeAction).toHaveBeenCalledWith(
+      'todo_task',
+      'archive_task', // body-based → registered under the declarative name, not a target
+      expect.objectContaining({ params: expect.objectContaining({ reason: 'done' }) }),
+    );
+  });
+
+  it('run_action dispatches a standalone GLOBAL action under the global wildcard key', async () => {
+    const { bridge, executeAction } = makeStandaloneBridge({ userId: 'u1', systemPermissions: [] }, [standaloneGlobal]);
+    const res = await bridge.runAction('nightly_cleanup', {});
+    expect(res.ok).toBe(true);
+    expect(executeAction).toHaveBeenCalledWith('global', 'nightly_cleanup', expect.anything());
+  });
+
+  it('run_action refuses an unexposed standalone row and never dispatches', async () => {
+    const { bridge, executeAction } = makeStandaloneBridge({ userId: 'u1', systemPermissions: [] }, [standaloneUnexposed]);
+    await expect(bridge.runAction('raw_reindex', {})).rejects.toThrow(/not exposed to AI/i);
+    expect(executeAction).not.toHaveBeenCalled();
+  });
+
+  it('run_action blocks a standalone row owned by a system object', async () => {
+    const { bridge, executeAction } = makeStandaloneBridge({ userId: 'u1', systemPermissions: [] }, [standaloneOnSysObject]);
+    await expect(bridge.runAction('rotate_all', {})).rejects.toThrow(/system object/i);
+    expect(executeAction).not.toHaveBeenCalled();
+  });
+
+  it('the bridge tolerates a metadata service without loadMany (standalone source absent)', async () => {
+    const { bridge } = makeBridge({ userId: 'u1', systemPermissions: [] }); // makeBridge's metadata mock has no loadMany
+    const names = (await bridge.listActions()).map((a: any) => a.name);
+    expect(names).toContain('complete_task');
+  });
 });
diff --git a/packages/runtime/src/http-dispatcher.ts b/packages/runtime/src/http-dispatcher.ts
index 2b683418c2..ad358ba126 100644
--- a/packages/runtime/src/http-dispatcher.ts
+++ b/packages/runtime/src/http-dispatcher.ts
@@ -812,27 +812,21 @@ export class HttpDispatcher {
             // identity forwarded. No `@objectstack/service-ai`.
             listActions: async () => {
                 const meta: any = await getMeta();
-                const objs: any[] = (await meta?.listObjects?.()) ?? [];
                 const hasAutomation = Boolean(
                     await this.resolveService('automation', envId).catch(() => null),
                 );
                 const out: any[] = [];
-                for (const obj of objs) {
-                    const objectName: string | undefined = obj?.name;
+                for (const { action, objectName, obj } of await this.collectActionDeclarations(meta)) {
                     if (!objectName || isSystemObjectName(objectName)) continue; // fail-closed on sys_*
-                    const actions: any[] = Array.isArray(obj?.actions) ? obj.actions : [];
-                    for (const action of actions) {
-                        if (!action || typeof action.name !== 'string') continue;
-                        if (!this.isHeadlessInvokableAction(action, hasAutomation)) continue;
-                        // [#2849 / ADR-0011] MCP is an AI surface: only actions the
-                        // author explicitly opted in via `ai.exposed` are listed.
-                        // Fail-closed — bodies run as trusted code (see
-                        // buildActionEngineFacade), so author opt-in is the boundary.
-                        if (this.actionAiExposureError(action)) continue;
-                        // Hide actions the caller is not permitted to run.
-                        if (this.actionPermissionError(action, ec)) continue;
-                        out.push(this.summarizeAction(action, obj, objectName));
-                    }
+                    if (!this.isHeadlessInvokableAction(action, hasAutomation)) continue;
+                    // [#2849 / ADR-0011] MCP is an AI surface: only actions the
+                    // author explicitly opted in via `ai.exposed` are listed.
+                    // Fail-closed — bodies run as trusted code (see
+                    // buildActionEngineFacade), so author opt-in is the boundary.
+                    if (this.actionAiExposureError(action)) continue;
+                    // Hide actions the caller is not permitted to run.
+                    if (this.actionPermissionError(action, ec)) continue;
+                    out.push(this.summarizeAction(action, obj, objectName));
                 }
                 return out;
             },
@@ -1176,24 +1170,86 @@ export class HttpDispatcher {
         name: string,
         objectName?: string,
     ): Promise<{ action: any; objectName: string } | null> {
+        const decls = await this.collectActionDeclarations(meta);
         if (objectName) {
-            const def: any = await meta?.getObject?.(objectName);
-            const action = Array.isArray(def?.actions) ? def.actions.find((a: any) => a?.name === name) : undefined;
-            return action ? { action, objectName } : null;
-        }
-        const objs: any[] = (await meta?.listObjects?.()) ?? [];
-        const matches: Array<{ action: any; objectName: string }> = [];
-        for (const obj of objs) {
-            if (!obj?.name) continue;
-            const action = Array.isArray(obj?.actions) ? obj.actions.find((a: any) => a?.name === name) : undefined;
-            if (action) matches.push({ action, objectName: obj.name });
+            const hit = decls.find((d) => d.objectName === objectName && d.action?.name === name);
+            return hit ? { action: hit.action, objectName } : null;
         }
+        const matches = decls.filter((d) => d.action?.name === name);
         if (matches.length === 0) return null;
         if (matches.length > 1) {
             const where = matches.map((m) => m.objectName).join(', ');
             throw new Error(`Action '${name}' exists on multiple objects (${where}); pass objectName to disambiguate`);
         }
-        return matches[0];
+        return { action: matches[0].action, objectName: matches[0].objectName };
+    }
+
+    /**
+     * The MCP surface's single declaration source: every action declaration the
+     * bridge may list or invoke, as `{ action, objectName, obj }` rows.
+     *
+     * Two shapes feed it (#3010):
+     *  1. `object.actions` — bundle/artifact objects and authored object rows.
+     *  2. Standalone `action` metadata items — Studio-authored rows that the
+     *     engine executes since #2608 (`resyncAuthoredActions`) but that never
+     *     appear inside any object definition. Their owning object follows the
+     *     same convention as the engine registration key (`objectName` field,
+     *     legacy `object` field, else the `'global'` wildcard).
+     *
+     * On a key clash (`objectName:name`) the object-embedded declaration wins,
+     * mirroring the execution layer's artifact-wins rule — `resyncAuthoredActions`
+     * refuses to clobber an artifact-registered handler, so the embedded
+     * declaration is the one that matches what actually runs. All MCP gating
+     * (`ai.exposed`, ADR-0066 D4, headless-invokability) applies downstream of
+     * this collection, unchanged.
+     */
+    private async collectActionDeclarations(
+        meta: any,
+    ): Promise<Array<{ action: any; objectName: string; obj: any }>> {
+        const objs: any[] = (await meta?.listObjects?.()) ?? [];
+        const objByName = new Map<string, any>();
+        for (const obj of objs) {
+            if (typeof obj?.name === 'string') objByName.set(obj.name, obj);
+        }
+        const out: Array<{ action: any; objectName: string; obj: any }> = [];
+        const seen = new Set<string>();
+        for (const obj of objs) {
+            const objectName: string | undefined = obj?.name;
+            if (!objectName) continue;
+            for (const action of Array.isArray(obj?.actions) ? obj.actions : []) {
+                if (!action || typeof action.name !== 'string') continue;
+                seen.add(`${objectName}:${action.name}`);
+                out.push({ action, objectName, obj });
+            }
+        }
+        let standalone: any[] = [];
+        try {
+            standalone = (await meta?.loadMany?.('action')) ?? [];
+        } catch {
+            standalone = []; // no standalone-item source on this metadata service
+        }
+        for (const action of standalone) {
+            if (!action || typeof action.name !== 'string') continue;
+            const objectName = this.standaloneActionObjectName(action);
+            const key = `${objectName}:${action.name}`;
+            if (seen.has(key)) continue; // object-embedded declaration wins
+            seen.add(key);
+            out.push({ action, objectName, obj: objByName.get(objectName) });
+        }
+        return out;
+    }
+
+    /**
+     * Owning object of a standalone `action` item — must stay in lockstep with
+     * the ObjectQL plugin's `actionObjectKey` (the engine registration key), so
+     * the declaration the MCP surface resolves is the one whose handler
+     * `executeAction` will find: spec `objectName`, bundle-collector `object`,
+     * else the `'global'` wildcard.
+     */
+    private standaloneActionObjectName(action: any): string {
+        if (typeof action?.objectName === 'string' && action.objectName.length > 0) return action.objectName;
+        if (typeof action?.object === 'string' && action.object.length > 0) return action.object;
+        return 'global';
     }
 
     /**