diff --git a/.changeset/11068-grid-declared-keys.md b/.changeset/11068-grid-declared-keys.md
index b87729c146..0645008bf5 100644
--- a/.changeset/11068-grid-declared-keys.md
+++ b/.changeset/11068-grid-declared-keys.md
@@ -38,5 +38,5 @@ now authors only keys the grid reads.
   refused by name.
 
 **Unchanged.** An `object-view`'s `table` slot still withholds `description` and `emptyState`.
-Write them on the `object-grid` node itself. `showFilters` and `keyboardNavigation` are still
-declared and still not read.
+Write them on the `object-grid` node itself. `keyboardNavigation` is still declared and still
+not read.
diff --git a/.changeset/11068-object-grid-show-filters.md b/.changeset/11068-object-grid-show-filters.md
new file mode 100644
index 0000000000..14ffe4a0dc
--- /dev/null
+++ b/.changeset/11068-object-grid-show-filters.md
@@ -0,0 +1,26 @@
+---
+'@object-ui/types': minor
+---
+
+`showFilters` is retired on `object-grid` (objectui#11068).
+
+**BREAKING (authoring).** An `object-grid` that carries `showFilters` now fails validation,
+and TypeScript code that writes it on an `ObjectGridSchema` no longer compiles. Delete the key.
+
+**What was wrong.** `ObjectGridSchema` declared `showFilters`, but an `object-grid` has no filter
+UI and never read the key. An author who wrote `showFilters: true` on a grid got no type error,
+no validator refusal and no filter.
+
+**Where filtering lives.** The filter builder is the `list-view` toolbar's. Author a `list-view`
+and switch the builder with its `userActions.filter`. To narrow the rows a grid fetches, write
+`filter` on the grid.
+
+**How it is refused.** The key is `?: never` on the `ObjectGridSchema` interface and a named
+refusal on its Zod twin. On both authoring faces, the node face and the strict authoring face,
+the message names the key and `userActions.filter`. This matches the upstream protocol, whose
+`object-grid` row does not declare the key either.
+
+**Unchanged.** An `object-view`'s own `showFilters` and a `list-view`'s are different keys, and
+both are still accepted. `ObjectView` reads its own, and `ListView` folds its own onto
+`userActions.filter`. An `object-view`'s `table` slot already refused `showFilters` and still
+does.
diff --git a/README.md b/README.md
index 060d9777ec..2f3fe1794c 100644
--- a/README.md
+++ b/README.md
@@ -222,7 +222,6 @@ published is not an error: the expression is returned as its own source text.
     { "field": "created_at", "label": "Joined" }
   ],
   "showSearch": true,
-  "showFilters": true,
   "operations": { "create": true, "read": true, "update": true, "delete": true, "export": true }
 }
 ```
diff --git a/content/docs/api/schema-reference.md b/content/docs/api/schema-reference.md
index e4c7384c59..8ac771a457 100644
--- a/content/docs/api/schema-reference.md
+++ b/content/docs/api/schema-reference.md
@@ -766,9 +766,9 @@ A data grid that auto-fetches from an ObjectQL object definition. Includes searc
 ```
 
 Every key in this example is one the grid reads (objectui#11068). It used to
-also author `showFilters`, `striped` and `operations.read`, which nothing reads,
-and `selection: { enabled, mode }` and `pagination.enabled`, which the validator
-refuses: selection is spelled `selection: { type: 'multiple' }` (`'none'`,
+also author `showFilters` (now retired on this node, below), `striped` and
+`operations.read`, which nothing reads, and `selection: { enabled, mode }` and
+`pagination.enabled`, which the validator refuses: selection is spelled `selection: { type: 'multiple' }` (`'none'`,
 `'single'` or `'multiple'`), and `pagination` declares no on switch — its
 presence enables paging.
 
@@ -798,6 +798,14 @@ presence enables paging.
 > `@object-ui/types` refuse them by name. Write `rowActions`, `bulkActions`, `id`
 > or `label`, and `emptyState: { "message": … }` instead.
 
+> **`showFilters` is retired on this node too (objectui#11068).** An `object-grid`
+> has no filter UI, and nothing read the key. The filter builder is the
+> `list-view` toolbar's: author a `list-view` node and switch it with
+> `"userActions": { "filter": true }`. To narrow the rows a grid fetches, write
+> `filter`. Both faces of `@object-ui/types` refuse an authored `showFilters` on an
+> `object-grid` by name. An [`object-view`](#objectviewschema)'s own `showFilters`,
+> below, is a different key and is unchanged.
+
 > **`defaultSort` is retired (objectui#5861).** `ObjectGridSchema` used to accept a
 > legacy single-entry `defaultSort: { field, order }` beside `sort`. The installed
 > `@objectstack/spec` protocol refuses it by name (a retired-key tombstone), and no
diff --git a/content/docs/plugins/plugin-grid.mdx b/content/docs/plugins/plugin-grid.mdx
index ff83408940..57db1c2b88 100644
--- a/content/docs/plugins/plugin-grid.mdx
+++ b/content/docs/plugins/plugin-grid.mdx
@@ -135,6 +135,12 @@ this node (objectui#11068): nothing ever read them, and both faces of
 `@object-ui/types` refuse them by name. Write `id` or `label`,
 `emptyState: { message }`, `rowActions` and `bulkActions` instead.
 
+`showFilters` is **retired** on this node too (objectui#11068). The grid has no
+filter UI, and nothing read the key. The filter builder is the `list-view`
+toolbar's, switched by its `userActions.filter`; to narrow the rows a grid
+fetches, write `filter`. An `object-view`'s own `showFilters` is a different key
+and is unchanged.
+
 ### Column Definition
 
 A column is either a **field name** (`"name"`) or a `ListColumn` object.
diff --git a/packages/plugin-grid/src/__tests__/ObjectGrid.declaredKeys-11068.test.tsx b/packages/plugin-grid/src/__tests__/ObjectGrid.declaredKeys-11068.test.tsx
index d772332e04..a81bb6b302 100644
--- a/packages/plugin-grid/src/__tests__/ObjectGrid.declaredKeys-11068.test.tsx
+++ b/packages/plugin-grid/src/__tests__/ObjectGrid.declaredKeys-11068.test.tsx
@@ -10,16 +10,18 @@
  * Every key `ObjectGridSchema` declares takes effect or is retired
  * (objectui#11068) — the RENDERER half. The declaration half (the four
  * tombstones and the `emptyState` mirror) is `packages/types`'
- * `object-grid-declared-keys-11068.test.ts`.
+ * `object-grid-declared-keys-11068.test.ts`; the fifth tombstone, `showFilters`,
+ * is `object-grid-show-filters-retired-11068.test.ts` there.
  *
  *   1. `description` draws one line of help text above the grid, resolved like
  *      `label` — a locale map against the display locale.
  *   2. `emptyState` draws in place of an empty table — but not when a term in
  *      the grid's own server-side search box emptied it, where the table and its
  *      search box must stay.
- *   3. `name`, `placeholder`, `rowSpecActions` and `bulkSpecActions` — the four
- *      keys the card retired — draw nothing. Asked with a RULER, the same
- *      document drawn twice and compared as bytes, because `ObjectGridRenderer`
+ *   3. `name`, `placeholder`, `rowSpecActions`, `bulkSpecActions` and
+ *      `showFilters` — the five keys the card retired — draw nothing. Asked
+ *      with a RULER, the same document drawn twice and compared as bytes,
+ *      because `ObjectGridRenderer`
  *      hands a node's leftover keys on as props and a source grep cannot see
  *      that channel (AGENTS.md, "a source grep's zero cannot answer this").
  *
@@ -172,7 +174,7 @@ describe('`emptyState` draws in place of an empty table (objectui#11068)', () =>
   });
 });
 
-/* ── 3. The four retired keys draw nothing ────────────────────────────────── */
+/* ── 3. The five retired keys draw nothing ────────────────────────────────── */
 
 /** Draw one document and return its markup, once the rows are on screen. */
 async function draw(schema: Record<string, unknown>): Promise<string> {
@@ -198,13 +200,17 @@ describe('the ruler', () => {
   });
 });
 
-describe('the four keys objectui#11068 retired change nothing the grid draws', () => {
+describe('the five keys objectui#11068 retired change nothing the grid draws', () => {
   it.each([
     ['name', 'all_contacts'],
     ['placeholder', 'Nothing here yet'],
     ['rowSpecActions', ['edit', 'delete']],
     ['bulkSpecActions', ['delete']],
-  ])('`%s`', async (key, value) => {
+    // Retired after triage's retriage answer: the grid has no filter UI, so
+    // neither value draws anything — the filter builder is `list-view`'s.
+    ['showFilters', true],
+    ['showFilters', false],
+  ])('`%s` (%j)', async (key, value) => {
     const a = await draw(grid(ROWS));
     cleanup();
     const b = await draw(grid(ROWS, { [key]: value }));
diff --git a/packages/plugin-grid/src/__tests__/ObjectGrid.operatorsInert-9729.test.tsx b/packages/plugin-grid/src/__tests__/ObjectGrid.operatorsInert-9729.test.tsx
index 124d6088cb..1100fbc307 100644
--- a/packages/plugin-grid/src/__tests__/ObjectGrid.operatorsInert-9729.test.tsx
+++ b/packages/plugin-grid/src/__tests__/ObjectGrid.operatorsInert-9729.test.tsx
@@ -29,8 +29,11 @@
  * draw identical bytes (the ruler is stable — no timestamps, no random ids), the
  * second is a LIT CONTROL on a key the renderer demonstrably DOES read, and only
  * then is the measurement taken. It is taken twice: once on a plain grid and
- * once with the filter surface on, since `operators` is a filtering word and a
- * grid without a filter affordance would be the wrong corpus to ask.
+ * once with the grid's search box on (`searchableFields`), since `operators` is
+ * a filtering word and a grid without its one query affordance would be the
+ * wrong corpus to ask. That corpus also used to carry `showFilters: true`, which
+ * never drew anything: an `object-grid` has no filter UI, and objectui#11068
+ * retired the key on this node.
  *
  * ⚠️ The claim is bounded by the ruler: this is what the RENDERED output does
  * with the key, on these documents. ⛔ It is not a claim that no code anywhere
@@ -88,11 +91,11 @@ describe('an authored `operators`', () => {
     expect(b).toBe(a);
   });
 
-  it('changes nothing with the filter surface on either', async () => {
-    const FILTERS = { ...BASE, showFilters: true, searchableFields: ['name'] };
-    const a = await draw({ ...FILTERS });
+  it('changes nothing with the search box on either', async () => {
+    const SEARCH = { ...BASE, searchableFields: ['name'] };
+    const a = await draw({ ...SEARCH });
     cleanup();
-    const b = await draw({ ...FILTERS, operators: { name: ['equals', 'contains'] } });
+    const b = await draw({ ...SEARCH, operators: { name: ['equals', 'contains'] } });
     expect(b).toBe(a);
   });
 });
diff --git a/packages/types/src/__tests__/object-grid-show-filters-retired-11068.test.ts b/packages/types/src/__tests__/object-grid-show-filters-retired-11068.test.ts
new file mode 100644
index 0000000000..f12d0aeaa6
--- /dev/null
+++ b/packages/types/src/__tests__/object-grid-show-filters-retired-11068.test.ts
@@ -0,0 +1,191 @@
+/**
+ * ObjectUI
+ * Copyright (c) 2024-present ObjectStack Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * `showFilters` is retired on `object-grid` (objectui#11068, triage's answer to
+ * the card's retriage) — the DECLARATION half. The renderer half, which shows an
+ * authored `showFilters` draws nothing, is `plugin-grid`'s
+ * `ObjectGrid.declaredKeys-11068.test.tsx`.
+ *
+ * ## Why a tombstone, and why it points at the list view
+ *
+ * `ObjectGrid` has no filter UI. The one filter surface objectui draws is the
+ * `list-view` toolbar's filter builder, switched by `userActions.filter`, so
+ * honouring the key on the grid would have meant building a second filter
+ * surface. The upstream protocol's `object-grid` row does not declare the key
+ * either. Deleting the member would refuse nothing: the zod twin ends
+ * `.passthrough()` and the interface inherits `BaseSchema`'s index signature.
+ * So the key stays DECLARED and unwritable on both faces — `retirementTombstone()`
+ * and `?: never` — as `rowSpecActions` and `defaultSort` are.
+ *
+ * ## The two authoring faces, and the controls beside each refusal
+ *
+ * The node face (`safeValidateSchema`) and the strict authoring face
+ * (`StrictAnyComponentSchema`) are both asked. A red parse proves a by-name
+ * refusal only beside a document that stays green on the same instrument: the
+ * grid without the key, a list view's own `showFilters` and `userActions.filter`,
+ * and an object view's own `showFilters` — which `ObjectView` still reads, so it
+ * is not retired here.
+ */
+
+import { describe, it, expect } from 'vitest';
+import type { z } from 'zod';
+import { ObjectGridPropsSchema as SpecObjectGridPropsSchema, ListViewSchema as SpecListViewSchema } from '@objectstack/spec/ui';
+import { ObjectGridSchema } from '../zod/objectql.zod.js';
+// Both faces through the barrel: objectui#8345 pins it as the only entry into
+// the strict face's module cycle, test files included.
+import { safeValidateSchema, StrictAnyComponentSchema } from '../zod/index.zod.js';
+import type {
+  ListViewSchema as ListViewSchemaType,
+  ObjectGridSchema as ObjectGridSchemaType,
+  ObjectViewSchema as ObjectViewSchemaType,
+} from '../objectql.js';
+
+/** A control key no surface in this package or the protocol declares. */
+const UNKNOWN_KEY = 'zzzNotAKeyAnySurfaceDeclares11068';
+
+/** The minimum green `object-grid` document. */
+const GRID = { type: 'object-grid' as const, objectName: 'probe' };
+
+type Issue = { code: string; path: PropertyKey[]; message: string; errors?: Issue[][] };
+
+/** The two authoring faces, each as a `safeParse`. */
+const FACES = [
+  ['node face (safeValidateSchema)', (doc: unknown) => safeValidateSchema(doc)],
+  ['strict authoring face (StrictAnyComponentSchema)', (doc: unknown) => StrictAnyComponentSchema.safeParse(doc)],
+] as const;
+
+type Parse = (doc: unknown) => z.ZodSafeParseResult<unknown>;
+
+/** Every issue in the tree, union arms included, with its full path. */
+function flatten(issues: Issue[] | undefined, prefix: PropertyKey[] = []): Issue[] {
+  const out: Issue[] = [];
+  for (const issue of issues ?? []) {
+    const path = [...prefix, ...issue.path];
+    out.push({ ...issue, path });
+    for (const arm of issue.errors ?? []) out.push(...flatten(arm, path));
+  }
+  return out;
+}
+
+function issueAt(parse: Parse, doc: unknown, path: string): Issue | undefined {
+  const result = parse(doc);
+  if (result.success) return undefined;
+  return flatten(result.error.issues as unknown as Issue[]).find((i) => i.path.map(String).join('.') === path);
+}
+
+describe('an authored `showFilters` on `object-grid` is refused BY NAME on both authoring faces (objectui#11068)', () => {
+  it.each(FACES)('%s refuses it at its own path, whatever the value', (_face, parse) => {
+    for (const value of [true, false]) {
+      const result = parse({ ...GRID, showFilters: value });
+      expect(result.success, `showFilters: ${value} parsed green`).toBe(false);
+      const issue = issueAt(parse, { ...GRID, showFilters: value }, 'showFilters');
+      expect(issue, `no issue at showFilters for ${value}`).toBeDefined();
+      // `retirementTombstone()` customises the MESSAGE only; the code is a bare `z.never()`'s.
+      expect(issue?.code).toBe('invalid_type');
+    }
+  });
+
+  it.each(FACES)('%s names the card and the list view’s `userActions.filter`', (_face, parse) => {
+    const message = String(issueAt(parse, { ...GRID, showFilters: true }, 'showFilters')?.message);
+    expect(message).toContain('objectui#11068');
+    expect(message).toContain('`userActions.filter`');
+    expect(message).toContain('`list-view`');
+  });
+
+  it.each(FACES)('LIT CONTROL — %s accepts the same grid without the key', (_face, parse) => {
+    const result = parse(GRID);
+    expect(result.success, result.success ? '' : JSON.stringify(result.error.issues)).toBe(true);
+  });
+
+  it('LIT CONTROL — the node face still keeps an unrecognised key on the same document', () => {
+    // Without this, the refusal above would be consistent with the whole object
+    // having turned strict on the node face — a far larger change than the one made.
+    expect(safeValidateSchema({ ...GRID, [UNKNOWN_KEY]: true }).success).toBe(true);
+  });
+
+  it('writes the SAME string into the metadata channel as into the parse message', () => {
+    const described = (ObjectGridSchema.shape.showFilters as { description?: string }).description;
+    const issue = ObjectGridSchema.safeParse({ ...GRID, showFilters: true });
+    expect(issue.success).toBe(false);
+    const message = issue.success ? undefined : issue.error.issues.find((i) => i.path.join('.') === 'showFilters')?.message;
+    expect(described).toBe(message);
+  });
+
+  it('the tombstone is a MEMBER, not a deletion — that is what makes the refusal loud', () => {
+    expect('showFilters' in ObjectGridSchema.shape).toBe(true);
+    expect(UNKNOWN_KEY in ObjectGridSchema.shape).toBe(false);
+  });
+});
+
+describe('`showFilters` stays live where a renderer reads it (the controls the retirement must not touch)', () => {
+  const LIST = { type: 'list-view' as const, objectName: 'probe', columns: ['name'] };
+
+  it.each(FACES)('%s accepts the list view’s `userActions.filter` — the spelling the refusal names', (_face, parse) => {
+    const result = parse({ ...LIST, userActions: { filter: true } });
+    expect(result.success, result.success ? '' : JSON.stringify(result.error.issues)).toBe(true);
+  });
+
+  it.each(FACES)('%s accepts a list view’s own `showFilters`', (_face, parse) => {
+    const result = parse({ ...LIST, showFilters: true });
+    expect(result.success, result.success ? '' : JSON.stringify(result.error.issues)).toBe(true);
+  });
+
+  it.each(FACES)('%s accepts an object view’s own `showFilters`', (_face, parse) => {
+    const result = parse({ type: 'object-view', objectName: 'probe', showFilters: true });
+    expect(result.success, result.success ? '' : JSON.stringify(result.error.issues)).toBe(true);
+  });
+});
+
+describe('the UPSTREAM half, re-derived from the installed pin', () => {
+  it('upstream `object-grid` does not declare `showFilters`, and refuses it', () => {
+    expect('showFilters' in SpecObjectGridPropsSchema.shape).toBe(false);
+    expect(SpecObjectGridPropsSchema.safeParse({ objectName: 'probe' }).success).toBe(true);
+    expect(SpecObjectGridPropsSchema.safeParse({ objectName: 'probe', showFilters: true }).success).toBe(false);
+  });
+
+  it('upstream `list-view` declares the toggle the refusal names: `userActions.filter`', () => {
+    const userActions = SpecListViewSchema.shape.userActions.unwrap();
+    expect('filter' in userActions.shape).toBe(true);
+  });
+});
+
+/* ── The TypeScript twin ────────────────────────────────────────────────── */
+
+/**
+ * The `@ts-expect-error` line below IS the assertion: the member is `?: never`,
+ * so the literal is a compile error. It fails this package's
+ * `tsc -p tsconfig.test.json` leg as an UNUSED directive if the member is
+ * deleted (the key would fall back to `BaseSchema`'s index signature) or
+ * re-typed as a live value.
+ */
+export const authoredShowFiltersRefused: ObjectGridSchemaType = {
+  ...GRID,
+  // @ts-expect-error — `showFilters` is RETIRED on `object-grid` (objectui#11068): a list view's `userActions.filter`.
+  showFilters: true,
+};
+
+/** LIT CONTROL: the spellings that stay live are declared, writable members. */
+export const listViewFilterToggleIsDeclared: ListViewSchemaType = {
+  type: 'list-view',
+  objectName: 'probe',
+  columns: ['name'],
+  userActions: { filter: true },
+};
+
+export const objectViewShowFiltersIsDeclared: ObjectViewSchemaType = {
+  type: 'object-view',
+  objectName: 'probe',
+  showFilters: true,
+};
+
+describe('the TypeScript twin', () => {
+  it('is compiled by this package’s type-check leg, which is where the bindings above are read', () => {
+    expect([authoredShowFiltersRefused, listViewFilterToggleIsDeclared, objectViewShowFiltersIsDeclared]).toHaveLength(3);
+  });
+});
diff --git a/packages/types/src/__tests__/object-view-slot-key-lists.test.ts b/packages/types/src/__tests__/object-view-slot-key-lists.test.ts
index ce1768f9e1..fe98f904bf 100644
--- a/packages/types/src/__tests__/object-view-slot-key-lists.test.ts
+++ b/packages/types/src/__tests__/object-view-slot-key-lists.test.ts
@@ -129,9 +129,9 @@ const FORM_IDENTITY_KEYS = ['type', 'objectName', 'mode'] as const;
  */
 const TABLE_WITHHELD_BY_REASON = {
   /**
-   * `ObjectGrid` has no read of it, so nothing could draw it. Four of these are
+   * `ObjectGrid` has no read of it, so nothing could draw it. Five of these are
    * retirement tombstones on `ObjectGridSchema` itself since objectui#11068
-   * (`bulkSpecActions`, `name`, `placeholder`, `rowSpecActions`).
+   * (`bulkSpecActions`, `name`, `placeholder`, `rowSpecActions`, `showFilters`).
    */
   unread: ['bulkSpecActions', 'keyboardNavigation', 'name', 'placeholder', 'rowSpecActions', 'showFilters'],
   /**
@@ -157,7 +157,7 @@ const TABLE_WITHHELD_KEYS: readonly string[] = Object.values(TABLE_WITHHELD_BY_R
 /**
  * Retirement tombstones `ObjectGridSchema` declares itself (`?: never` on both
  * faces) that the slot keeps: they type nothing, and they carry the named
- * refusal and its guidance onto this face too. The four the grid retired in
+ * refusal and its guidance onto this face too. The five the grid retired in
  * objectui#11068 are in the withheld set above instead, refused by the slot's
  * own message.
  */
diff --git a/packages/types/src/objectql.ts b/packages/types/src/objectql.ts
index e4a65b1f2e..a39e046fb9 100644
--- a/packages/types/src/objectql.ts
+++ b/packages/types/src/objectql.ts
@@ -991,11 +991,28 @@ export interface ObjectGridSchema extends BaseSchema {
   showSearch?: boolean;
   
   /**
-   * @deprecated Use filter property instead
-   * Legacy filters toggle
+   * RETIRED on this node (objectui#11068, ADR-0049) — the grid has no filter UI.
+   *
+   * `ObjectGrid` never read the key, so an authored value drew nothing. The one
+   * filter surface objectui draws is the `list-view` toolbar's filter builder,
+   * switched by the list view's `userActions.filter`; honouring the key
+   * here would have built a second one, and the upstream protocol's
+   * `object-grid` row does not declare it. The rows this grid fetches are
+   * narrowed by {@link ObjectGridSchema.filter}.
+   *
+   * `?: never`, not a deletion — the convention of `rowSpecActions` below:
+   * without a member, the key would fall to {@link BaseSchema}'s index
+   * signature and type-check again. Lockstep with the Zod twin
+   * (`zod/objectql.zod.ts`, `retirementTombstone()`). An `object-view`'s own
+   * {@link ObjectViewSchema.showFilters} is a different member, read by
+   * `ObjectView`, and is unaffected.
+   *
+   * @deprecated RETIRED (objectui#11068) — author a `list-view` and switch its
+   * filter builder with `userActions.filter`; write `filter` to narrow this
+   * grid's rows.
    */
-  showFilters?: boolean;
-  
+  showFilters?: never;
+
   /**
    * @deprecated Use pagination config instead
    * Legacy pagination toggle
@@ -2133,14 +2150,14 @@ export interface ObjectFormSchema extends BaseSchema {
  *     active named view declares the same member, the named view wins;
  *   - three of the retirement tombstones `ObjectGridSchema` declares (`body`,
  *     `children`, `defaultSort`, each `?: never`). They type nothing: they keep
- *     the named refusal, and its guidance, on this face too. The four the grid
+ *     the named refusal, and its guidance, on this face too. The five the grid
  *     retired later (`name`, `placeholder`, `rowSpecActions`,
- *     `bulkSpecActions`, objectui#11068) are withheld instead, below — the
- *     slot refuses each of them by name either way.
+ *     `bulkSpecActions`, `showFilters`, objectui#11068) are withheld instead,
+ *     below — the slot refuses each of them by name either way.
  *
  * ⛔ Every other `ObjectGridSchema` member is WITHHELD, because on the view's
- * grid it reached nothing: `ObjectGrid` has no read of it (`showFilters`,
- * `keyboardNavigation`, and the four tombstones just named); `ObjectGrid`
+ * grid it reached nothing: `ObjectGrid` has no read of it
+ * (`keyboardNavigation`, and the five tombstones just named); `ObjectGrid`
  * reads it on its own node but the view does not hand it on (`emptyState`,
  * `description` — honoured by the grid since objectui#11068, and kept off
  * this slot by that card's ruling, which enforced them without widening it);
diff --git a/packages/types/src/zod/objectql.zod.ts b/packages/types/src/zod/objectql.zod.ts
index fa554ca4d6..79b3cee3cc 100644
--- a/packages/types/src/zod/objectql.zod.ts
+++ b/packages/types/src/zod/objectql.zod.ts
@@ -272,6 +272,11 @@ const OBJECT_GRID_NAME_RETIRED =
 const OBJECT_GRID_PLACEHOLDER_RETIRED =
   'RETIRED on `object-grid` (objectui#11068, ADR-0049) — a grid is not an input, and nothing read '
   + '`placeholder`. The text the grid shows when it has no rows is `emptyState: { message }`.';
+const OBJECT_GRID_SHOW_FILTERS_RETIRED =
+  'RETIRED on `object-grid` (objectui#11068, ADR-0049) — the grid has no filter UI, and nothing read '
+  + '`showFilters`, so an authored value drew nothing. The filter builder is the `list-view` toolbar\'s: '
+  + 'author a `list-view` and switch the builder with its `userActions.filter`. To narrow the rows this '
+  + 'grid fetches, write `filter`.';
 
 /**
  * objectui#11070 — ONE `.describe()` string for every object-bound arm that declares
@@ -337,7 +342,6 @@ export const ObjectGridSchema = BaseSchema.extend({
   selectable: z.union([z.boolean(), z.enum(['single', 'multiple'])]).optional(),
   pageSize: z.number().optional(),
   showSearch: z.boolean().optional(),
-  showFilters: z.boolean().optional(),
   showPagination: z.boolean().optional(),
   // objectui#5861 — RETIRED under ADR-0049, in lockstep with the `?: never`
   // twin on the interface. `@objectstack/spec` refuses this key BY NAME on
@@ -414,10 +418,18 @@ export const ObjectGridSchema = BaseSchema.extend({
   // tombstone rather than a deletion, as for `defaultSort`: `BaseSchema` is
   // `.passthrough()` (and declares `name` / `placeholder` itself), so without a
   // member here the key would be KEPT unexamined, not refused.
+  //
+  // `showFilters` followed on triage's retriage answer: the grid has no filter
+  // UI, and the one filter surface objectui draws is the `list-view` toolbar's
+  // builder (`userActions.filter`), so honouring the key here would have built a
+  // second one. The upstream `object-grid` row does not declare it either. An
+  // `object-view`'s or a `list-view`'s own `showFilters` is a different member,
+  // read by its own renderer, and is untouched.
   rowSpecActions: retirementTombstone(OBJECT_GRID_ROW_SPEC_ACTIONS_RETIRED),
   bulkSpecActions: retirementTombstone(OBJECT_GRID_BULK_SPEC_ACTIONS_RETIRED),
   name: retirementTombstone(OBJECT_GRID_NAME_RETIRED),
   placeholder: retirementTombstone(OBJECT_GRID_PLACEHOLDER_RETIRED),
+  showFilters: retirementTombstone(OBJECT_GRID_SHOW_FILTERS_RETIRED),
   // objectui#11068 — read by `ObjectGrid`, which draws it in place of an empty
   // table. Mirrored member for member with the interface: three optional
   // strings, and an unknown member refused rather than kept, so a misspelt
@@ -727,9 +739,9 @@ export const ObjectFormSchema = BaseSchema.extend({
  * omitted key would be KEPT unexamined, and the slot would accept silently
  * what the TypeScript face refuses. Three of the tombstones `ObjectGridSchema`
  * itself declares (`body`, `children`, `defaultSort`) are inherited unchanged;
- * the four it retired later (`name`, `placeholder`, `rowSpecActions`,
- * `bulkSpecActions`, objectui#11068) are overridden below by this slot's own
- * refusal, which names the same remedy.
+ * the five it retired later (`name`, `placeholder`, `rowSpecActions`,
+ * `bulkSpecActions`, `showFilters`, objectui#11068) are overridden below by this
+ * slot's own refusal.
  */
 const tableKeyRefusal = (key: string, why: string) =>
   retirementTombstone(