@@ -0,0 +1,41 @@
+---
+'@objectstack/spec': major
+---
+
+spec(ui): `userFilters.allowAddTab` 提升进契约,`UserFiltersSchema` 随之收紧 (#5073)
+
+`UserFiltersSchema` 是 #4001 批 18 在 `ui/view.zod.ts` 留下的最后一块「不是 strictness 问题」的开放形状 —— 挡住它的是一条**能力声明**,不是姿态判断。
+
+**为什么之前不能直接关。** objectui 的列表渲染器真读 `config.allowAddTab` 并据此渲染「新增 tab」控件(`plugin-list/src/UserFilters.tsx:182` / `:742`),它自己的 `UserFiltersSchema` 也声明了这个键 —— 两边形状的差集恰好只有这一个。而 `saveMetaItem` 用 `safeParse` 校验后**原样存原始 body**(丢弃 `parsed.data`,好让 Studio 的辅助键活过往返),所以被 strip 掉的只是那份被丢弃的解析结果:存储里键还在,渲染器读得到,**这个能力今天是工作的**。直接收紧不是「把静默失效变响亮」,而是把一个已发布、在用的配置变成 422 —— 而且 422 会点名一个作者本来写对了的键,正是本战役 finding 7 的形状(平台权威把作者引向删掉能工作的东西)。
+
+**裁定与落地(维护者 2026-08-04,选项 A):promote 后收紧,同 PR 完成。** `allowAddTab` 现在**声明**在 `UserFiltersSchema` 上,能力因此可从契约被发现 —— JSON Schema、Studio 的 SchemaForm、AI 作者都看得到,而不是只存在于一个 React 文件里。被否决的是判它为 objectui-only 扩展(`SANCTIONED_LOCAL`):那会让 `packages/spec` 与 objectui 成为同一份契约的两个事实来源,正是 #2231 的 derive-by-reference 统一要消掉的分叉(PD#12)。声明的措辞刻意收窄到渲染器真做的事 —— 它声明「渲染出新增 tab 的入口」,不承诺点击后能创建预设(objectui 那个按钮目前没有 click handler,已另行立案),因为承诺更多就是 PD#10 的「宣传运行时并不交付的能力」。
+
+## BREAKING
+
+**1. `userFilters` 上的未知键从静默丢弃变为拒绝。**
+
+```diff
+  userFilters: {
+    element: 'tabs',
+-   allowAddTabs: true,   // 拼错 → 以前静默消失,现在 422(并提示 → allowAddTab)
++   allowAddTab: true,
+  }
+```
+
+FROM → TO:未声明的键 → 删除它,或改成它想表达的那个已声明键。错误信息会点名该键并给出最近的候选。`allowAddTab` 本身**不需要迁移** —— 它现在是合法声明键,原有配置照常通过。
+
+**2. 对象列表视图(`ObjectUserFiltersSchema`)拒绝 page-only 的三个键:`tabs` / `showAllRecords` / `allowAddTab`。**
+
+这三个键在对象视图上一直是无效的(`ObjectUserFiltersSchema` 由 `UserFiltersSchema.omit()` 派生,而 `.omit()` 继承基类姿态),此前被静默丢弃 —— 与此同时 CLI lint(`packages/lint/src/validate-list-view-mode.ts`)早就在报同一个配置。两扇门从此一致。
+
+```diff
+  // 对象视图:tab 栏的角色已被 ViewTabBar(已存视图切换器)占用
+  listViews: {
+-   // userFilters: { element: 'dropdown', tabs: [{ name: 'mine', label: '我的' }] }
++   mine: { label: '我的', filter: [['owner', '=', '{userId}']] },   // 每个具名视图渲染成一个分段 tab
+  }
+```
+
+FROM → TO:`userFilters.tabs` → 对象的 `listViews` 具名条目;`showAllRecords` → 默认列表视图本身就是「全部记录」入口;`allowAddTab` → 由 ViewTabBar 自带的新增控件承担。三条拒绝各自带 `guidance` 处方,不是裸的 "unrecognized key"。
+
+派生变体同时改为携带**自己的**错误映射:`.omit()` 会连基类的 `knownKeys` 一起继承,而那份候选列表是从基类形状读的、仍然含被 omit 掉的键 —— 实测在对象视图上写 `tab` 会被答复 *"Did you mean `tab` → `tabs`?"*,把作者指向这个形状唯一拒绝的键。形状仍由 `.omit()` 派生(#2231 不变),候选池改为按 omit 后的形状构建。
@@ -55,7 +55,7 @@ Interface-level page configuration (Airtable parity)
 | **levels** | `integer` | optional | Number of hierarchy levels to display |
 | **sourceView** | `string` | optional | @deprecated Legacy named-view inheritance. Define columns/sort/filterBy on the page instead. |
 | **appearance** | `{ showDescription: boolean; allowedVisualizations?: Enum<'grid' \| 'kanban' \| 'gallery' \| 'calendar' \| 'timeline' \| 'gantt' \| 'map' \| 'chart' \| 'tree'>[] }` | optional | Appearance and visualization configuration |
-| **userFilters** | `{ element: Enum<'dropdown' \| 'tabs' \| 'toggle'>; fields?: { field: string; label?: string; type?: Enum<'select' \| 'multi-select' \| 'boolean' \| 'date-range' \| 'text'>; options?: { value: string \| number \| boolean; label: string; color?: string }[]; … }[]; tabs?: { name: string; label?: string; icon?: string; view?: string; … }[]; showAllRecords?: boolean }` | optional | End-user quick-filter bar for this page (overrides the source view's userFilters) |
+| **userFilters** | `{ element: Enum<'dropdown' \| 'tabs' \| 'toggle'>; fields?: { field: string; label?: string; type?: Enum<'select' \| 'multi-select' \| 'boolean' \| 'date-range' \| 'text'>; options?: { value: string \| number \| boolean; label: string; color?: string }[]; … }[]; tabs?: { name: string; label?: string; icon?: string; view?: string; … }[]; showAllRecords?: boolean; … }` | optional | End-user quick-filter bar for this page (overrides the source view's userFilters) |
 | **userActions** | `{ sort: boolean; search: boolean; filter: boolean; refresh: boolean; … }` | optional | User action toggles |
 | **addRecord** | `{ enabled: boolean; position: Enum<'top' \| 'bottom' \| 'both'>; mode: Enum<'inline' \| 'form' \| 'modal'>; formView?: string }` | optional | Add record entry point configuration |
 | **buttons** | `string[]` | optional | Toolbar buttons — names of the source object's actions to surface in the page toolbar |
 
@@ -375,7 +375,7 @@ List chart view configuration
 | **sort** | `string \| { field: string; order: Enum<'asc' \| 'desc'> }[]` | optional |  |
 | **searchableFields** | `string[]` | optional | Fields enabled for search |
 | **filterableFields** | `string[]` | optional | Legacy shorthand for userFilters.fields — bare field names enabled for end-user filtering. Prefer userFilters |
-| **userFilters** | `{ element?: Enum<'dropdown' \| 'tabs' \| 'toggle'>; fields?: { field: string; label?: string; type?: Enum<'select' \| 'multi-select' \| 'boolean' \| 'date-range' \| 'text'>; options?: { value: string \| number \| boolean; label: string; color?: string }[]; … }[]; tabs?: { name: string; label?: string; icon?: string; view?: string; … }[]; showAllRecords?: boolean }` | optional | End-user quick-filter bar: dropdown/toggle fields or tab presets. Omit to let the renderer derive filters from select/boolean fields |
+| **userFilters** | `{ element?: Enum<'dropdown' \| 'tabs' \| 'toggle'>; fields?: { field: string; label?: string; type?: Enum<'select' \| 'multi-select' \| 'boolean' \| 'date-range' \| 'text'>; options?: { value: string \| number \| boolean; label: string; color?: string }[]; … }[]; tabs?: { name: string; label?: string; icon?: string; view?: string; … }[]; showAllRecords?: boolean; … }` | optional | End-user quick-filter bar: dropdown/toggle fields or tab presets. Omit to let the renderer derive filters from select/boolean fields |
 | **resizable** | `boolean` | optional | Enable column resizing |
 | **striped** | `boolean` | optional | Striped row styling |
 | **bordered** | `boolean` | optional | Show borders |
@@ -653,6 +653,7 @@ End-user quick-filter configuration (Airtable "User filters" parity)
 | **fields** | `{ field: string; label?: string; type?: Enum<'select' \| 'multi-select' \| 'boolean' \| 'date-range' \| 'text'>; options?: { value: string \| number \| boolean; label: string; color?: string }[]; … }[]` | optional | Fields exposed as quick filters (dropdown/toggle elements) |
 | **tabs** | `{ name: string; label?: string; icon?: string; view?: string; … }[]` | optional | Named filter presets rendered as tabs (tabs element). Reuses ViewTabSchema |
 | **showAllRecords** | `boolean` | optional | Show an "All records" tab before the presets (tabs element) |
+| **allowAddTab** | `boolean` | optional | Render an "add tab" affordance after the presets (tabs element). Page lists only — object views use `listViews` for named presets |
 
 
 ---
 
@@ -21,15 +21,15 @@ regenerate.
 | Measure | Value |
 |---|---|
 | Triaged directories | 5 |
-| Object sites in them | 483 |
-| Still-open (strip) sites | 235 |
+| Object sites in them | 484 |
+| Still-open (strip) sites | 234 |
 | Files carrying at least one | 36 |
 
 Remaining strip sites by class:
 
 | Bucket | Sites |
 |---|---|
-| authorable — the ruling's forced scope | 29 |
+| authorable — the ruling's forced scope | 28 |
 | unresolved — needs a per-schema verdict | 33 |
 | wire / open — out of forced scope | 104 |
 | no door — no carrier, ADR-0049 territory | 38 |
@@ -43,12 +43,12 @@ The `strict` column is the one the campaign schedules against; it counts both th
 
 | Dir | Sites | strict | passthrough | catchall | strip |
 |---|---|---|---|---|---|
-| `ui/` | 199 | 118 | 5 | 0 | 76 |
+| `ui/` | 200 | 120 | 5 | 0 | 75 |
 | `data/` | 162 | 41 | 1 | 0 | 120 |
 | `automation/` | 75 | 49 | 0 | 0 | 26 |
 | `security/` | 20 | 7 | 0 | 0 | 13 |
 | `studio/` | 27 | 27 | 0 | 0 | 0 |
-| **total** | **483** | **242** | **6** | **0** | **235** |
+| **total** | **484** | **244** | **6** | **0** | **234** |
 
 ## File-level triage — site counts
 
@@ -79,9 +79,9 @@ classify and is not listed (it becomes reportable the day it grows its first sit
 | `sharing.zod.ts` | 2 |
 | `theme.zod.ts` | 14 |
 | `touch.zod.ts` | 7 |
-| `view.zod.ts` | 50 |
+| `view.zod.ts` | 51 |
 | `widget.zod.ts` | 9 |
-| **total** | **199** |
+| **total** | **200** |
 
 ### `data/` — sites
 
@@ -161,7 +161,7 @@ over it is here.
 
 ### `ui/` — open
 
-**76 strip of 199**, in 13 file(s).
+**75 strip of 200**, in 13 file(s).
 
 | File | Strip | Sites |
 |---|---|---|
@@ -176,13 +176,13 @@ over it is here.
 | `offline.zod.ts` | 3 | 3 |
 | `sharing.zod.ts` | 1 | 2 |
 | `touch.zod.ts` | 7 | 7 |
-| `view.zod.ts` | 6 | 50 |
+| `view.zod.ts` | 5 | 51 |
 | `widget.zod.ts` | 9 | 9 |
-| **total** | **76** | **199** |
+| **total** | **75** | **200** |
 
 | Bucket | Sites |
 |---|---|
-| authorable — the ruling's forced scope | 7 |
+| authorable — the ruling's forced scope | 6 |
 | unresolved — needs a per-schema verdict | 0 |
 | wire / open — out of forced scope | 0 |
 | no door — no carrier, ADR-0049 territory | 38 |
 
@@ -7964,6 +7964,7 @@
     "ui/UserFilterField:options",
     "ui/UserFilterField:showCount",
     "ui/UserFilterField:type",
+    "ui/UserFilters:allowAddTab",
     "ui/UserFilters:element",
     "ui/UserFilters:fields",
     "ui/UserFilters:showAllRecords",
 
@@ -230,7 +230,12 @@ describe('posture reading, with a red control for each', () => {
     // And the claim the ledger rests on: no STRIP site moved. Both postures
     // involved are non-strip, so the remaining-strip map — the thing every batch
     // is planned against — is untouched by this fix.
-    expect(countStripSites(at('ui/view.zod.ts'))).toBe(6);
+    //
+    // The number itself tracks real batches: 6 when #5072 was written, 5 since
+    // #5073 closed `UserFiltersSchema`. It is the file's live strip count, not a
+    // #5072 invariant — what #5072 pins is that ITS OWN change moved no strip
+    // site, and that still reads correctly against whatever the current count is.
+    expect(countStripSites(at('ui/view.zod.ts'))).toBe(5);
   });
 
   it('lets a chained posture override the idiom in either direction (#5072)', () => {
 
@@ -23,15 +23,36 @@ describe('ObjectListViewSchema (ADR-0047 "views" mode)', () => {
     expect((parsed as { userFilters?: unknown }).userFilters).toMatchObject(uf);
   });
 
-  it('drops the page-only tabs/showAllRecords keys from a dropdown userFilters', () => {
-    const parsed = ObjectListViewSchema.parse({
+  it('REJECTS the page-only tabs/showAllRecords/allowAddTab keys on a dropdown userFilters', () => {
+    // Flipped from "drops" at #5073, and the flip is the point: until then the
+    // schema silently discarded these while the CLI lint
+    // (`packages/lint/src/validate-list-view-mode.ts`) reported them — two
+    // doors disagreeing about the same config. They now agree.
+    const r = ObjectListViewSchema.safeParse({
       ...base,
-      userFilters: { element: 'dropdown', tabs: [{ name: 'mine', label: 'Mine', filter: [] }], showAllRecords: true },
+      userFilters: {
+        element: 'dropdown',
+        tabs: [{ name: 'mine', label: 'Mine', filter: [] }],
+        showAllRecords: true,
+        allowAddTab: true,
+      },
     } as never);
-    const parsedUf = (parsed as { userFilters?: Record<string, unknown> }).userFilters!;
-    expect(parsedUf).not.toHaveProperty('tabs');
-    expect(parsedUf).not.toHaveProperty('showAllRecords');
-    expect(parsedUf.element).toBe('dropdown');
+    expect(r.success).toBe(false);
+    const msg = JSON.stringify(r.error?.issues ?? []);
+    expect(msg).toContain('tabs');
+    expect(msg).toContain('showAllRecords');
+    expect(msg).toContain('allowAddTab');
+  });
+
+  it('…and the rejection prescribes `listViews`, the thing an object view actually uses', () => {
+    // A page-only key has a right answer on an object view, so a bare
+    // "unrecognized key" would be a correct refusal that still leaves the
+    // author guessing — the failure mode #5073 was filed to avoid.
+    const r = ObjectListViewSchema.safeParse({
+      ...base,
+      userFilters: { element: 'dropdown', tabs: [{ name: 'mine', label: 'Mine', filter: [] }] },
+    } as never);
+    expect(JSON.stringify(r.error?.issues ?? [])).toContain('listViews');
   });
 
   it('rejects a tabs-element userFilters (page-only, would collide with ViewTabBar)', () => {