@@ -0,0 +1,22 @@
+---
+'@objectstack/spec': minor
+'@objectstack/metadata-protocol': minor
+'@objectstack/rest': patch
+'@object-ui/data-objectstack': patch
+'@object-ui/app-shell': patch
+'@object-ui/i18n': patch
+---
+
+feat(spec): a draft's per-key provenance records writes made through the MCP build door, and the OAuth client that made them
+
+Clause-②: yes (widening)
+Metadata-protocol: added
+
+A pending draft's `draftChanges` (the strict draft read's per-key provenance) could tell Studio's AI copilot from a person in Studio and from any other caller, but not an AI agent outside the console building through a deployment's MCP build door. Such a write was recorded as `api`, and nothing said which agent it was.
+
+- **Spec.** `MetadataAuthoringSurfaceSchema` gains `mcp`: an AI agent outside the console writing on a person's behalf through the MCP build door. A new `MetadataAuthoringClientSchema` (`{ id, name? }`) is the OAuth client the person consented to. A `draftChanges` entry carries it as an optional `client`, present only beside `by: 'mcp'`. `SaveMetaItemRequestSchema` gains an optional `client`, stated only by the MCP build door, in-process, from the token it verified.
+- **The save.** A draft save with `surface: 'mcp'` stamps `by: 'mcp'` and its `client` on every key path it changes. A `client` beside any other surface, or of the wrong shape, is refused `400 INVALID_REQUEST` before anything is written. `actor` is still the person the agent writes for.
+- **The HTTP doors.** `?surface=mcp` is refused `400 VALIDATION_ERROR`, as `?surface=copilot` is: only the MCP build door may state it. No HTTP door reads a `client`.
+- **Studio.** The properties' draft chip and source line mark an `mcp` write as they mark the copilot's, and name the client: 「由 MCP 客户端「Claude」在 2 分钟前作为草稿加入」 / "Added as a draft by the MCP client "Claude" 2 min ago". A client that registered no name is shown as an unnamed MCP client, never by its id. The pending-changes sheet's drill-in lists which AI tools drafted part of the item, in all ten console locales.
+
+Nothing to do for existing callers: a save that states no surface is still recorded as `api`, and an entry without `client` reads as before. The MCP build door starts stating `mcp` and its client in a later change.
@@ -1,7 +1,7 @@
 ---
 title: Protocol reference — every schema by module
 navTitle: Protocol Reference
-description: Every schema published by @objectstack/spec — 1559 schemas across 14 protocol modules
+description: Every schema published by @objectstack/spec — 1560 schemas across 14 protocol modules
 ---
 
 {/* ⚠️  AUTO-GENERATED — DO NOT EDIT. Run build-docs.ts to regenerate. Hand-written docs live in the module folders under content/docs/. */}
@@ -21,7 +21,7 @@ counts are sums of the rows they head. Regenerate with
 | Module | Pages | Schemas | Description |
 | :--- | ---: | ---: | :--- |
 | [AI Protocol](/docs/references/ai) | 12 | 68 | Agents, tools, skills, RAG and knowledge sources, model registry, conversations. |
-| [API Protocol](/docs/references/api) | 32 | 439 | REST contracts, endpoints, routing, realtime, batch, discovery. |
+| [API Protocol](/docs/references/api) | 32 | 440 | REST contracts, endpoints, routing, realtime, batch, discovery. |
 | [Automation Protocol](/docs/references/automation) | 15 | 77 | Flows and their nodes, approvals, ETL pipelines, webhooks, state machines, execution records. |
 | [Data Protocol](/docs/references/data) | 31 | 185 | Objects, fields, queries, filters, datasources and drivers — the ObjectQL layer. |
 | [Identity Protocol](/docs/references/identity) | 5 | 27 | Users and accounts, organizations, positions, SCIM provisioning. |
@@ -34,7 +34,7 @@ counts are sums of the rows they head. Regenerate with
 | [Studio Protocol](/docs/references/studio) | 3 | 35 | Studio designer metadata — the authoring surfaces for the protocols above. |
 | [System Protocol](/docs/references/system) | 37 | 287 | The runtime environment — logging, jobs, cache, metrics, notifications, i18n and compliance. |
 | [UI Protocol](/docs/references/ui) | 16 | 172 | Apps, pages, views, dashboards, reports, actions and themes — the ObjectUI layer. |
-| **Total** | **202** | **1559** | 14 protocol modules |
+| **Total** | **202** | **1560** | 14 protocol modules |
 
 ---
 
@@ -63,7 +63,7 @@ Agents, tools, skills, RAG and knowledge sources, model registry, conversations.
 
 ## API Protocol
 
-**Source:** `packages/spec/src/api/` · **Import:** `@objectstack/spec/api` · **32 pages, 439 schemas**
+**Source:** `packages/spec/src/api/` · **Import:** `@objectstack/spec/api` · **32 pages, 440 schemas**
 
 REST contracts, endpoints, routing, realtime, batch, discovery.
 
@@ -91,7 +91,7 @@ REST contracts, endpoints, routing, realtime, batch, discovery.
 | [`package-api-assembled.zod.ts`](/docs/references/api/package-api-assembled) | `AssembledInstalledPackage`, `GetInstalledPackageResponse`, `InstalledPackageAtEitherStage`, `ListInstalledPackagesResponse` |
 | [`package-lifecycle.zod.ts`](/docs/references/api/package-lifecycle) | `DiscardPackageDraftsResponse`, `DuplicatePackageResponse`, `ImportUnmanagedPackageRequest`, `ImportUnmanagedPackageResponse`, `ListPackageCommitsResponse`, `PackageExportManifest`, `PackagePublishResult`, `ReassignOrphanedMetadataResponse`, `RevertPackageCommitResponse`, `RollbackToPackageCommitResponse` |
 | [`plugin-rest-api.zod.ts`](/docs/references/api/plugin-rest-api) | `ErrorHandlingConfig`, `OpenApiGenerationConfig`, `RequestValidationConfig`, `ResponseEnvelopeConfig`, `RestApiEndpoint`, `RestApiPluginConfig`, `RestApiRouteCategory`, `RestApiRouteRegistration`, `ValidationMode` |
-| [`protocol.zod.ts`](/docs/references/api/protocol) | `AiAgentCapabilities`, `AiAgentChatRequest`, `AiAgentSummary`, `AiAgentsResponse`, `AiChatRequest`, `AiChatResponse`, `AiCompleteRequest`, `AiConversation`, `AiMessage`, `AiModelsResponse`, `AiPendingAction`, `AiPendingActionStatus`, `AiStreamChunk`, `ApproveAiPendingActionResponse`, `AuditMetaItemRequest`, `AuditMetaItemResponse`, `AutomationActionsResponse`, `AutomationTriggerRequest`, `AutomationTriggerResponse`, `BatchDataRequest`, `BatchDataResponse`, `CheckPermissionRequest`, `CheckPermissionResponse`, `CloneDataResponse`, `CreateAiConversationRequest`, `CreateDataRequest`, `CreateDataResponse`, `CreateManyDataRequest`, `CreateManyDataResponse`, `DeleteDataRequest`, `DeleteDataResponse`, `DeleteManyDataRequest`, `DeleteManyDataResponse`, `DeleteMetaItemRequest`, `DeleteMetaItemResponse`, `DiffMetaItemResponse`, `DisablePackageRequest`, `DisablePackageResponse`, `EnablePackageRequest`, `EnablePackageResponse`, `FindDataRequest`, `FindDataResponse`, `FindReferencesToMetaResponse`, `FlowRegistration`, `FlowRegistrationRefusal`, `GetDataRequest`, `GetDataResponse`, `GetDiscoveryRequest`, `GetDiscoveryResponse`, `GetEffectivePermissionsRequest`, `GetEffectivePermissionsResponse`, `GetFieldLabelsRequest`, `GetFieldLabelsResponse`, `GetLocalesRequest`, `GetLocalesResponse`, `GetMetaDiagnosticsResponse`, `GetMetaItemCachedRequest`, `GetMetaItemCachedResponse`, `GetMetaItemLayeredRequest`, `GetMetaItemLayeredResponse`, `GetMetaItemRequest`, `GetMetaItemResponse`, `GetMetaItemsRequest`, `GetMetaItemsResponse`, `GetMetaTypesRequest`, `GetMetaTypesResponse`, `GetNotificationPreferencesRequest`, `GetNotificationPreferencesResponse`, `GetObjectPermissionsRequest`, `GetObjectPermissionsResponse`, `GetPackageRequest`, `GetPackageResponse`, `GetPresenceRequest`, `GetPresenceResponse`, `GetPublishedMetaItemResponse`, `GetRecordFieldAccessResponse`, `GetTranslationsRequest`, `GetTranslationsResponse`, `GetUiViewRequest`, `GetUiViewResponse`, `HistoryMetaItemRequest`, `HistoryMetaItemResponse`, `HttpFindQueryParams`, `InstallPackageRequest`, `InstallPackageResponse`, `ListAiConversationsRequest`, `ListAiConversationsResponse`, `ListAiPendingActionsRequest`, `ListAiPendingActionsResponse`, `ListDraftsResponse`, `ListNotificationsRequest`, `ListNotificationsResponse`, `ListPackagesRequest`, `ListPackagesResponse`, `MarkAllNotificationsReadRequest`, `MarkAllNotificationsReadResponse`, `MarkNotificationsReadRequest`, `MarkNotificationsReadResponse`, `MetadataAuthoringSurface`, `MetadataConflictError`, `Notification`, `NotificationPreferences`, `PublishMetaItemRequest`, `PublishMetaItemResponse`, `PublishPackageDraftsResponse`, `RealtimeConnectRequest`, `RealtimeConnectResponse`, `RealtimeDisconnectRequest`, `RealtimeDisconnectResponse`, `RealtimeSubscribeRequest`, `RealtimeSubscribeResponse`, `RealtimeUnsubscribeRequest`, `RealtimeUnsubscribeResponse`, `RegisterDeviceRequest`, `RegisterDeviceResponse`, `RejectAiPendingActionResponse`, `RollbackMetaItemResponse`, `RuntimeAuthoringIssue`, `SaveMetaItemRequest`, `SaveMetaItemResponse`, `SearchAllHit`, `SearchAllPageHit`, `SearchAllResponse`, `SetPresenceRequest`, `SetPresenceResponse`, `UninstallPackageRequest`, `UninstallPackageResponse`, `UnregisterDeviceRequest`, `UnregisterDeviceResponse`, `UpdateAiConversationRequest`, `UpdateDataRequest`, `UpdateDataResponse`, `UpdateManyDataRequest`, `UpdateManyDataResponse`, `UpdateNotificationPreferencesRequest`, `UpdateNotificationPreferencesResponse`, `ValidateDataIssue`, `ValidateDataRequest`, `ValidateDataResponse` |
+| [`protocol.zod.ts`](/docs/references/api/protocol) | `AiAgentCapabilities`, `AiAgentChatRequest`, `AiAgentSummary`, `AiAgentsResponse`, `AiChatRequest`, `AiChatResponse`, `AiCompleteRequest`, `AiConversation`, `AiMessage`, `AiModelsResponse`, `AiPendingAction`, `AiPendingActionStatus`, `AiStreamChunk`, `ApproveAiPendingActionResponse`, `AuditMetaItemRequest`, `AuditMetaItemResponse`, `AutomationActionsResponse`, `AutomationTriggerRequest`, `AutomationTriggerResponse`, `BatchDataRequest`, `BatchDataResponse`, `CheckPermissionRequest`, `CheckPermissionResponse`, `CloneDataResponse`, `CreateAiConversationRequest`, `CreateDataRequest`, `CreateDataResponse`, `CreateManyDataRequest`, `CreateManyDataResponse`, `DeleteDataRequest`, `DeleteDataResponse`, `DeleteManyDataRequest`, `DeleteManyDataResponse`, `DeleteMetaItemRequest`, `DeleteMetaItemResponse`, `DiffMetaItemResponse`, `DisablePackageRequest`, `DisablePackageResponse`, `EnablePackageRequest`, `EnablePackageResponse`, `FindDataRequest`, `FindDataResponse`, `FindReferencesToMetaResponse`, `FlowRegistration`, `FlowRegistrationRefusal`, `GetDataRequest`, `GetDataResponse`, `GetDiscoveryRequest`, `GetDiscoveryResponse`, `GetEffectivePermissionsRequest`, `GetEffectivePermissionsResponse`, `GetFieldLabelsRequest`, `GetFieldLabelsResponse`, `GetLocalesRequest`, `GetLocalesResponse`, `GetMetaDiagnosticsResponse`, `GetMetaItemCachedRequest`, `GetMetaItemCachedResponse`, `GetMetaItemLayeredRequest`, `GetMetaItemLayeredResponse`, `GetMetaItemRequest`, `GetMetaItemResponse`, `GetMetaItemsRequest`, `GetMetaItemsResponse`, `GetMetaTypesRequest`, `GetMetaTypesResponse`, `GetNotificationPreferencesRequest`, `GetNotificationPreferencesResponse`, `GetObjectPermissionsRequest`, `GetObjectPermissionsResponse`, `GetPackageRequest`, `GetPackageResponse`, `GetPresenceRequest`, `GetPresenceResponse`, `GetPublishedMetaItemResponse`, `GetRecordFieldAccessResponse`, `GetTranslationsRequest`, `GetTranslationsResponse`, `GetUiViewRequest`, `GetUiViewResponse`, `HistoryMetaItemRequest`, `HistoryMetaItemResponse`, `HttpFindQueryParams`, `InstallPackageRequest`, `InstallPackageResponse`, `ListAiConversationsRequest`, `ListAiConversationsResponse`, `ListAiPendingActionsRequest`, `ListAiPendingActionsResponse`, `ListDraftsResponse`, `ListNotificationsRequest`, `ListNotificationsResponse`, `ListPackagesRequest`, `ListPackagesResponse`, `MarkAllNotificationsReadRequest`, `MarkAllNotificationsReadResponse`, `MarkNotificationsReadRequest`, `MarkNotificationsReadResponse`, `MetadataAuthoringClient`, `MetadataAuthoringSurface`, `MetadataConflictError`, `Notification`, `NotificationPreferences`, `PublishMetaItemRequest`, `PublishMetaItemResponse`, `PublishPackageDraftsResponse`, `RealtimeConnectRequest`, `RealtimeConnectResponse`, `RealtimeDisconnectRequest`, `RealtimeDisconnectResponse`, `RealtimeSubscribeRequest`, `RealtimeSubscribeResponse`, `RealtimeUnsubscribeRequest`, `RealtimeUnsubscribeResponse`, `RegisterDeviceRequest`, `RegisterDeviceResponse`, `RejectAiPendingActionResponse`, `RollbackMetaItemResponse`, `RuntimeAuthoringIssue`, `SaveMetaItemRequest`, `SaveMetaItemResponse`, `SearchAllHit`, `SearchAllPageHit`, `SearchAllResponse`, `SetPresenceRequest`, `SetPresenceResponse`, `UninstallPackageRequest`, `UninstallPackageResponse`, `UnregisterDeviceRequest`, `UnregisterDeviceResponse`, `UpdateAiConversationRequest`, `UpdateDataRequest`, `UpdateDataResponse`, `UpdateManyDataRequest`, `UpdateManyDataResponse`, `UpdateNotificationPreferencesRequest`, `UpdateNotificationPreferencesResponse`, `ValidateDataIssue`, `ValidateDataRequest`, `ValidateDataResponse` |
 | [`query-adapter.zod.ts`](/docs/references/api/query-adapter) | `ODataQueryAdapter`, `OperatorMapping`, `QueryAdapterConfig`, `QueryAdapterTarget`, `RestQueryAdapter` |
 | [`realtime.zod.ts`](/docs/references/api/realtime) | `RealtimeConfig`, `RealtimeEvent`, `RealtimeEventType`, `RealtimePresence`, `Subscription`, `SubscriptionEvent`, `TransportProtocol` |
 | [`realtime-shared.zod.ts`](/docs/references/api/realtime-shared) | `BasePresence`, `PresenceStatus`, `RealtimeRecordAction` |
 
@@ -19,4 +19,4 @@ hand-patch a number here** — fix the code or the verdict and regenerate.
 
 | Dir | Sites |
 |---|---|
-| `api/` | 448 |
+| `api/` | 449 |
@@ -10,7 +10,7 @@
  */
 import { describe, expect, it } from 'vitest';
 import { GetMetaItemResponseSchema } from '@objectstack/spec/api';
-import { draftChangedPaths, mergeDraftChanges, storedDraftChanges, type DraftChangeEntry } from './draft-changes.js';
+import { authoringClientOf, draftChangedPaths, mergeDraftChanges, storedDraftChanges, type DraftChangeEntry } from './draft-changes.js';
 
 const AT = '2026-10-18T12:00:00.000Z';
 const AT2 = '2026-10-18T12:05:00.000Z';
@@ -105,6 +105,36 @@ describe('mergeDraftChanges — no two entries share a path; the longest prefix
         const entries = mergeDraftChanges([], [['label']], copilot);
         expect(mergeDraftChanges(entries, [['label']], studio)).toEqual([{ path: ['label'], ...studio }]);
     });
+
+    it('[#27176] an `mcp` stamp carries its client onto each path; a stamp with none adds no `client` key', () => {
+        const mcp = { by: 'mcp' as const, actor: 'u_1', at: AT, client: { id: 'cli_1', name: 'Claude' } };
+        expect(mergeDraftChanges([], [['label'], ['columns']], mcp)).toEqual([
+            { path: ['label'], ...mcp },
+            { path: ['columns'], ...mcp },
+        ]);
+        const [bare] = mergeDraftChanges([], [['label']], { by: 'mcp', actor: null, at: AT });
+        expect('client' in bare!).toBe(false);
+    });
+});
+
+describe('[#27176] authoringClientOf — the one shape a client takes', () => {
+    it('copies a non-empty id and an optional non-empty name, member by member', () => {
+        expect(authoringClientOf({ id: 'cli_1' })).toEqual({ id: 'cli_1' });
+        expect(authoringClientOf({ id: 'cli_1', name: 'Claude' })).toEqual({ id: 'cli_1', name: 'Claude' });
+    });
+
+    it.each([
+        ['not an object', 'cli_1'],
+        ['null', null],
+        ['an array', [{ id: 'cli_1' }]],
+        ['an empty id', { id: '' }],
+        ['no id', { name: 'Claude' }],
+        ['an empty name', { id: 'cli_1', name: '' }],
+        ['a non-string name', { id: 'cli_1', name: 7 }],
+        ['an extra member', { id: 'cli_1', secret: 's' }],
+    ])('%s is not a client', (_label, value) => {
+        expect(authoringClientOf(value)).toBeUndefined();
+    });
 });
 
 describe('storedDraftChanges — the stored form, never []', () => {
@@ -115,6 +145,12 @@ describe('storedDraftChanges — the stored form, never []', () => {
         expect(storedDraftChanges([entry])).toEqual([entry]);
     });
 
+    it('[#27176] reads an `mcp` entry with its client, and one without', () => {
+        const mcp: DraftChangeEntry = { path: ['label'], by: 'mcp', actor: 'u_1', at: AT, client: { id: 'cli_1', name: 'Claude' } };
+        const bare: DraftChangeEntry = { path: ['columns'], by: 'mcp', actor: 'u_1', at: AT };
+        expect(storedDraftChanges(JSON.stringify([mcp, bare]))).toEqual([mcp, bare]);
+    });
+
     it.each([
         ['NULL (a row saved before the writer)', null],
         ['an absent column', undefined],
@@ -124,6 +160,8 @@ describe('storedDraftChanges — the stored form, never []', () => {
         ['an unknown surface', JSON.stringify([{ ...entry, by: 'robot' }])],
         ['an empty segment', JSON.stringify([{ ...entry, path: [''] }])],
         ['a dotted-string path', JSON.stringify([{ ...entry, path: 'a.b' }])],
+        ['a client beside a surface other than mcp', JSON.stringify([{ ...entry, client: { id: 'cli_1' } }])],
+        ['a malformed client', JSON.stringify([{ ...entry, by: 'mcp', client: { id: '' } }])],
     ])('%s reads as not recorded (undefined), never []', (_label, raw) => {
         expect(storedDraftChanges(raw)).toBeUndefined();
     });