diff --git a/.changeset/6357-basechema-bind-declaration.md b/.changeset/6357-basechema-bind-declaration.md
new file mode 100644
index 0000000000..c2d8302b83
--- /dev/null
+++ b/.changeset/6357-basechema-bind-declaration.md
@@ -0,0 +1,44 @@
+---
+'@object-ui/types': minor
+'@object-ui/plugin-dashboard': patch
+---
+
+`BaseSchema` declares `bind`, the data-scope binding path, on both halves — the TypeScript
+interface and its Zod mirror (objectui#6357).
+
+`bind` was read by ten production sites and declared by no schema shape. It resolved as `any`
+through `BaseSchema`'s index signature and rode `.passthrough()` on the validator, while three
+separate documents taught it as an authorable key of *every* node: this repo's own `AGENTS.md`
+§4 ("Every node in the UI tree follows this shape (`@object-ui/types`)"), the published
+agent-facing `skills/objectui/rules/protocol.md` ("Every UI component node MUST follow this
+shape"), and `content/docs/fields/grid.mdx`. So the agent-facing protocol told authors to write
+a key the published types did not know existed.
+
+The census chose the home rather than guessing it. Nine reads go through
+`useDataScope(schema.bind)` — `list` and `tree-view` in `@object-ui/components`, and the
+`object-*` widgets in `plugin-charts`, `plugin-dashboard` (×2), `plugin-grid`, `plugin-kanban`,
+`plugin-list`, `plugin-timeline`. A tenth is `plugin-grid`'s `gridNeedsDataSource` predicate,
+where a present `bind` is one of the escape hatches that makes a missing data-source adapter
+legitimate. Two more sites destructure the key out so `SchemaRenderer`'s prop spread cannot
+write `bind="data.revenue"` onto the DOM. Per-component declaration was measured and rejected:
+it costs nine copies of one key and buys nothing extra, because neither half can refuse the key
+on a non-reader either way. `placeholder` is the standing precedent for a cross-cutting key
+declared on `BaseSchema` and honoured only by a subset.
+
+**Accept-set narrowing, on the value and not the key.** `bind: 42` type-checked and parsed green
+before this change and is refused by both halves now. It only refuses what already crashed:
+`useDataScope` is `(path?: string)` and resolves via `path.split('.')`, so a non-string `bind`
+threw a `TypeError` at render time. Every `bind` authored in this repo is a string, and the
+declaration is optional, so nothing that renders today stops.
+
+**What this does NOT change**, stated because the pin would otherwise be read as more than it is:
+an *undeclared* key is still accepted by both halves, so this did not buy rejection of a
+misspelling such as `bindTo` (objectui#5155 / objectui#6269 own that ceiling). And `data-table`
+still does not call `useDataScope`, so a `bind` on it is still ignored and still renders a header
+over an empty body with no error — a documented silent failure that this declaration neither
+causes nor cures, since the key was accepted on every node before it existed.
+
+`ObjectPivotTable` drops its local `bind?: string`: its `PivotTableSchema & {…}` intersection
+extends `BaseSchema`, so the member was a true duplicate. Two other local declarations are left
+in place and ratcheted rather than removed — their containing types never reference `BaseSchema`,
+so deleting the member would delete the declaration rather than inherit it.
diff --git a/packages/plugin-dashboard/src/ObjectPivotTable.tsx b/packages/plugin-dashboard/src/ObjectPivotTable.tsx
index b7688fd424..c759ad7ba0 100644
--- a/packages/plugin-dashboard/src/ObjectPivotTable.tsx
+++ b/packages/plugin-dashboard/src/ObjectPivotTable.tsx
@@ -42,7 +42,10 @@ export interface ObjectPivotTableProps {
   schema: PivotTableSchema & {
     objectName?: string;
     dataProvider?: { provider: string; object?: string };
-    bind?: string;
+    // The data-scope binding key is NOT re-declared here. It used to be, as a
+    // local member grown because no schema shape declared it — the
+    // second-declaration class objectui#6357 measured. `PivotTableSchema
+    // extends BaseSchema`, which now declares it once, same spelling.
     filter?: any;
   };
   dataSource?: any;
diff --git a/packages/types/src/__tests__/base-bind-declared.test.ts b/packages/types/src/__tests__/base-bind-declared.test.ts
new file mode 100644
index 0000000000..d563bffc3e
--- /dev/null
+++ b/packages/types/src/__tests__/base-bind-declared.test.ts
@@ -0,0 +1,264 @@
+/**
+ * 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.
+ */
+
+/**
+ * Declaration pin — `bind`, the data-scope vocabulary read across the repo and
+ * declared by no schema shape (objectui#6357).
+ *
+ * ## What was wrong
+ *
+ * Ten production sites read `bind` off a schema node and NOTHING declared it.
+ * It resolved as `any` through `BaseSchema`'s index signature, while three
+ * separate documents taught it as an authorable key of every node — this
+ * repo's own `AGENTS.md` §4 ("Every node in the UI tree follows this shape
+ * (`@object-ui/types`)", declaring `bind` as an optional string), the PUBLISHED agent-facing
+ * `skills/objectui/rules/protocol.md` ("Every UI component node MUST follow
+ * this shape"), and `content/docs/fields/grid.mdx`.
+ *
+ * The census that chose this home, measured on `origin/main` `c5037fd29`:
+ *
+ *   - **9** reads of `useDataScope(schema.bind)` — `components`' `list` and
+ *     `tree-view`, and the `object-*` widgets in `plugin-charts`,
+ *     `plugin-dashboard` (×2), `plugin-grid`, `plugin-kanban`, `plugin-list`,
+ *     `plugin-timeline`;
+ *   - **1** non-hook read — `plugin-grid/src/index.tsx`'s `gridNeedsDataSource`
+ *     predicate, where `schema?.bind != null` is one of the escape hatches that
+ *     makes a missing data-source adapter legitimate rather than a defect;
+ *   - **2** DOM-strip destructures — `MetricWidget` / `MetricCard`, which
+ *     destructure `bind` out so `SchemaRenderer`'s spread cannot write
+ *     `bind="data.revenue"` onto the DOM (objectui#4357).
+ *
+ * ## Why `BaseSchema` and not nine per-component declarations
+ *
+ * Because per-component buys NOTHING extra — see the ceiling below, which is
+ * symmetric: neither half can refuse the key on a non-reader either way. It
+ * costs nine copies of one key for zero enforcement, and the class had already
+ * generated FOUR local declarations before this one existed — three spelled
+ * `string`, one spelled `unknown`. `schemaHostProps.ts`'s own header names the
+ * hazard: "two copies of one key list is how a list becomes two disagreeing
+ * lists". Exactly ONE of the four was a true duplicate of a base member —
+ * `ObjectPivotTable`'s, whose `PivotTableSchema & {…}` intersection does extend
+ * `BaseSchema`; it is removed by this card. The other three are load-bearing:
+ * their containing types never reference `BaseSchema`, so deleting the member
+ * deletes the declaration rather than inheriting it. They are ratcheted below.
+ *
+ * `placeholder` is the standing precedent for a cross-cutting key declared here
+ * and honoured by a subset: every node may write it, only inputs read it.
+ *
+ * ## The ceiling, stated rather than assumed (objectui#5155 / objectui#6269)
+ *
+ * Same ceiling as objectui#5903's gantt pin and objectui#6170's timeline pin.
+ * `BaseSchema` carries `[key: string]: any` on the TS side and is
+ * `.passthrough()` on the zod side, so:
+ *
+ *   - an UNDECLARED key is still accepted by both halves. Declaring `bind` did
+ *     NOT buy rejection of `bindTo`, and the counter-probe below pins that
+ *     honestly rather than letting a reader assume otherwise;
+ *   - a DECLARED key IS validated. `bind: 42` type-checked and parsed green
+ *     before this card and is refused by both halves now — the accept-set
+ *     narrowing this card lands;
+ *   - on the TS side a read site can never be the detector, because the index
+ *     signature types `schema.bind` as `any` either way. So the compile-time
+ *     pin is the `@ts-expect-error` block at the bottom: remove the
+ *     declaration and the member resolves to `any`, the wrong-typed assignment
+ *     starts succeeding, and the now-unused directive fails the build (TS2578)
+ *     NAMING the key. `tsconfig.test.json` compiles this file, so that is real
+ *     enforcement and not decoration (objectui#3009).
+ *
+ * The narrowing only refuses what already crashed: `useDataScope` is
+ * `(path?: string)` and resolves via `path.split('.')`, so a non-string `bind`
+ * threw a TypeError at render time.
+ *
+ * ## What this pin deliberately does NOT cover
+ *
+ * `data-table` does not call `useDataScope`, so a `bind` on it is ignored and
+ * the table renders its header over an empty body — no error, no warning. That
+ * is recorded in `protocol.md` and already pinned in
+ * `components/src/__tests__/skill-guide-data-table-binding.test.tsx`. Declaring
+ * the key here neither causes nor cures it: `bind` was accepted on every node
+ * before this declaration existed, via the index signature and `.passthrough()`.
+ */
+
+import { describe, it, expect } from 'vitest';
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+import { BaseSchema } from '../zod/base.zod.js';
+import type { BaseSchema as BaseSchemaTS } from '../base.js';
+
+const HERE = dirname(fileURLToPath(import.meta.url));
+const REPO_ROOT = join(HERE, '..', '..', '..', '..');
+
+const MINIMAL = { type: 'list' } as const;
+
+describe('BaseSchema (zod) — `bind` is mirrored and validated', () => {
+  it('declares `bind` in the mirror shape', () => {
+    // The pair `base.zod.ts#BaseSchema` carries no `KnownDrift` /
+    // `UnmirroredDeclared` entry, so `zod-mirror-parity.test.ts` independently
+    // reddens by name if the TS declaration ever outruns this member. This
+    // asserts the member directly so the failure is readable here too.
+    expect(Object.keys(BaseSchema.shape)).toContain('bind');
+  });
+
+  it('accepts the path forms the readers resolve', () => {
+    for (const bind of ['customerNames', 'app.settings.users', 'rows']) {
+      expect(BaseSchema.safeParse({ ...MINIMAL, bind }).success, bind).toBe(true);
+    }
+  });
+
+  it('refuses a non-string `bind` — the accept-set narrowing this card lands', () => {
+    // Green before this card (`.passthrough()` waved it through); it then threw
+    // `path.split is not a function` inside `useDataScope` at render time.
+    for (const bind of [42, true, { path: 'customers' }, ['customers']]) {
+      expect(BaseSchema.safeParse({ ...MINIMAL, bind }).success, JSON.stringify(bind)).toBe(false);
+    }
+  });
+
+  it('still accepts a MISSPELLING — the ceiling, pinned honestly', () => {
+    // Counter-probe against reading the two assertions above as more than they
+    // are. `.passthrough()` accepts any undeclared key, so `bindTo` is waved
+    // through exactly as `bind` used to be. Closing THAT is objectui#5155 /
+    // objectui#6269, not this card; if it is ever closed, this expectation is
+    // the one that must be revisited deliberately rather than silently.
+    expect(BaseSchema.safeParse({ ...MINIMAL, bindTo: 'customers' }).success).toBe(true);
+  });
+
+  it('leaves `bind` optional — every node that never binds still parses', () => {
+    expect(BaseSchema.safeParse(MINIMAL).success).toBe(true);
+  });
+});
+
+describe('BaseSchema (TS) — compile-time pin on `bind`', () => {
+  it('refuses a wrong-typed `bind`', () => {
+    // This directive fails the build (TS2578, "unused '@ts-expect-error'") the
+    // moment `bind` stops being declared, because the member then resolves to
+    // `any` through the index signature and the assignment starts succeeding.
+    // That failure is the signal this card exists to create.
+
+    // @ts-expect-error — `bind` is declared `string | undefined`.
+    const bind: BaseSchemaTS['bind'] = 42;
+
+    expect(bind).toBe(42);
+  });
+
+  it('accepts a well-typed `bind`', () => {
+    // Counter-probe for the directive above: without this, a declaration
+    // narrowed to `never` would satisfy it.
+    const node: BaseSchemaTS = { type: 'list', bind: 'customerNames' };
+    expect(node.bind).toBe('customerNames');
+  });
+});
+
+/**
+ * ONE declaration, not N.
+ *
+ * The card's own warning is that guessing the home "would produce the second
+ * declaration this class keeps generating" — and two had already appeared
+ * before anyone declared the key centrally. This scan is the guard against the
+ * third: a schema-side optional `bind` member anywhere outside its home reads as a
+ * local re-declaration, which is how the two disagreeing spellings (`string`
+ * vs `unknown`) came to exist in the first place.
+ */
+describe('`bind` is declared in exactly one place (objectui#6357)', () => {
+  /**
+   * Every allowed non-home declaration, WITH ITS REASON.
+   *
+   * None of the three is a schema shape, which is why none of them inherits the
+   * declaration and none could simply be deleted. Two are hand-rolled inline
+   * `schema` prop types with no `BaseSchema` in their ancestry — a real defect,
+   * but objectui#5155 / objectui#6269's, filed and not fixed here. The third is
+   * a DOM-strip props type. An entry here is a declared decision; a file that is
+   * in neither this map nor the home fails the scan.
+   */
+  const ALLOWED = new Map<string, string>([
+    [
+      'packages/plugin-dashboard/src/schemaHostProps.ts',
+      'DOM-strip props type, not a schema shape — all seven members are `unknown` by design, '
+        + 'because the type exists to be destructured out and never read (objectui#4357).',
+    ],
+    [
+      'packages/plugin-dashboard/src/ObjectDataTable.tsx',
+      'RATCHET, not an endorsement. `ObjectDataTableProps.schema` is an inline object type that '
+        + 'never references `BaseSchema`, so this member is load-bearing rather than duplicated — '
+        + 'removing it would not inherit the declaration, it would delete it. The disconnected '
+        + 'hand-rolled schema prop type is objectui#5155 / objectui#6269 territory, not this card.',
+    ],
+    [
+      'packages/plugin-list/src/ObjectGallery.tsx',
+      'RATCHET, same shape as the entry above — `ObjectGalleryProps.schema` is a hand-rolled inline '
+        + 'type with no `BaseSchema` in its ancestry and (unlike that one) no index signature, so '
+        + 'dropping the member is a compile error rather than an inheritance.',
+    ],
+  ]);
+
+  const HOME = 'packages/types/src/base.ts';
+
+  it('no schema shape re-declares `bind` outside `BaseSchema`', async () => {
+    const { execFileSync } = await import('node:child_process');
+    // `git grep` over TRACKED files only, so an untracked scratch file or a
+    // stray build artefact cannot fail this. `-n` for a readable failure.
+    // ASSEMBLED, never written as one literal. `git grep` searches TRACKED
+    // files, so the moment this file is committed a literal pattern would match
+    // THIS file and the scan would report itself. Allow-listing itself would
+    // have been the wrong repair — it puts a permanent hole in the scan at the
+    // one path most likely to grow a copy of the pattern.
+    const PATTERN = 'bind' + '?:';
+
+    let out: string;
+    try {
+      out = execFileSync(
+        'git',
+        ['grep', '-n', '-F', '--', PATTERN, 'packages'],
+        { cwd: REPO_ROOT, encoding: 'utf8' },
+      );
+    } catch (err: any) {
+      // `git grep` exits 1 on "no matches" — which would mean the home
+      // declaration itself vanished. Fall through to the assertions below,
+      // which then fail naming it.
+      out = err?.stdout ?? '';
+    }
+
+    const hits = out
+      .split('\n')
+      .filter(Boolean)
+      .map((line) => line.slice(0, line.indexOf(':')));
+
+    // Counter-probe: a filter over an empty scan passes vacuously.
+    expect(hits, 'the scan found nothing at all — check the pattern').not.toHaveLength(0);
+    expect(hits, `\`${HOME}\` must declare \`bind\``).toContain(HOME);
+
+    const strays = [...new Set(hits)].filter((f) => f !== HOME && !ALLOWED.has(f));
+    expect(
+      strays,
+      `a second \`${PATTERN}\` declaration appeared — declare it once on \`BaseSchema\`, `
+        + 'or add the file to ALLOWED above with its reason',
+    ).toEqual([]);
+  });
+
+  it('the readers still read the key this declaration is about', () => {
+    // The declaration is only worth its doc comment while the reads exist. One
+    // representative per package, so a rename that leaves the key undeclared
+    // again cannot pass quietly.
+    const readers = [
+      'packages/components/src/renderers/data-display/list.tsx',
+      'packages/components/src/renderers/data-display/tree-view.tsx',
+      'packages/plugin-charts/src/ObjectChart.tsx',
+      'packages/plugin-dashboard/src/ObjectDataTable.tsx',
+      'packages/plugin-dashboard/src/ObjectPivotTable.tsx',
+      'packages/plugin-grid/src/ObjectGrid.tsx',
+      'packages/plugin-kanban/src/ObjectKanban.tsx',
+      'packages/plugin-list/src/ObjectGallery.tsx',
+      'packages/plugin-timeline/src/ObjectTimeline.tsx',
+    ];
+    for (const rel of readers) {
+      const src = readFileSync(join(REPO_ROOT, rel), 'utf8');
+      expect(src, `${rel} no longer reads \`schema.bind\``).toContain('useDataScope(schema.bind)');
+    }
+    expect(readers).toHaveLength(9);
+  });
+});
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 e405e4a1c5..b87b4bd67e 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
@@ -24,6 +24,13 @@
  *   ObjectFormSchema                                              -> 67 members
  *   Omit<ObjectFormSchema, 'type' | 'objectName' | 'mode'>        ->  0 members
  *
+ * ⚠️ Those two member counts are the HISTORICAL reading that produced this
+ * pin, kept verbatim because the `-> 0` half is only legible beside them. The
+ * LIVE counts are 62 and 68: objectui#6357 declared `bind` on `BaseSchema`,
+ * both schemas inherit it, and this guard turned red naming them — which is
+ * precisely the drift it exists to catch. The key was added to both slot
+ * unions in the same change, so the slots still ship the full configuration.
+ *
  * Nothing errored — the index signature answers every key as `any` — so the
  * symptoms were in the tools that READ the declaration: `table: { colunms: 3 }`
  * type-checked, `table: { pageSize: 'ten' }` type-checked, and editor completion
@@ -173,18 +180,18 @@ function slotType(slot: 'table' | 'form'): ts.Type {
  * inherited: bump them deliberately when a member is genuinely added.
  */
 describe('the source schemas still declare their full member sets', () => {
-  it('ObjectGridSchema declares 61 members and carries the #5155 index signature', () => {
+  it('ObjectGridSchema declares 62 members and carries the #5155 index signature', () => {
     const grid = exportedType('ObjectGridSchema');
-    expect(memberNames(grid)).toHaveLength(61);
+    expect(memberNames(grid)).toHaveLength(62);
     expect(memberNames(grid)).toEqual(expect.arrayContaining(['columns', 'pageSize', 'rowActions']));
     // When this flips to `false`, objectui#5155 has removed the root index
     // signature and the `Pick` lists this file pins become removable.
     expect(declaresStringIndex(grid)).toBe(true);
   });
 
-  it('ObjectFormSchema declares 67 members and carries the #5155 index signature', () => {
+  it('ObjectFormSchema declares 68 members and carries the #5155 index signature', () => {
     const form = exportedType('ObjectFormSchema');
-    expect(memberNames(form)).toHaveLength(67);
+    expect(memberNames(form)).toHaveLength(68);
     expect(memberNames(form)).toEqual(expect.arrayContaining(['fields', 'sections', 'submitText']));
     expect(declaresStringIndex(form)).toBe(true);
   });
diff --git a/packages/types/src/__tests__/object-view-spec-parity.test.ts b/packages/types/src/__tests__/object-view-spec-parity.test.ts
index 1af529cd49..f28324c3c5 100644
--- a/packages/types/src/__tests__/object-view-spec-parity.test.ts
+++ b/packages/types/src/__tests__/object-view-spec-parity.test.ts
@@ -145,7 +145,7 @@ const ENVELOPE = new Set(shapeKeys(OuiBaseSchema));
  * Envelope keys this node REDECLARES with a narrower type.
  *
  * Detected by member IDENTITY against `BaseSchema`, not by a hand-written list:
- * `BaseSchema.extend()` copies the envelope's 20 members in, so a key that is
+ * `BaseSchema.extend()` copies the envelope's 21 members in, so a key that is
  * still the base's own member is inherited, and one that is a different object
  * was deliberately narrowed on this node (`type: z.literal('object-view')`,
  * `description: z.string()`). They are part of the node's declared surface and
diff --git a/packages/types/src/__tests__/zod-mirror-parity.test.ts b/packages/types/src/__tests__/zod-mirror-parity.test.ts
index 38797ec5b9..74bfdd2695 100644
--- a/packages/types/src/__tests__/zod-mirror-parity.test.ts
+++ b/packages/types/src/__tests__/zod-mirror-parity.test.ts
@@ -192,7 +192,7 @@ export type NarrowerThanDeclared< M, D > = {
  * index signatures SEPARATELY, so remapping the index-signature keys to `never`
  * leaves the literal members — INCLUDING the ones inherited from `BaseSchema`.
  * Same probe against this alias resolves the 36 literal names of
- * `ObjectGanttSchema` and the 20 of `BaseSchema`.
+ * `ObjectGanttSchema` and the 21 of `BaseSchema` (20 until objectui#6357 added `bind`).
  *
  * ⚠️ This lifts the ceiling on what the GUARD can READ, not on what a mirror can
  * REJECT. #5155's ceiling stands: `BaseSchema` is `.passthrough()`, so declaring a
diff --git a/packages/types/src/base.ts b/packages/types/src/base.ts
index c06cc8c458..bf5ca5162e 100644
--- a/packages/types/src/base.ts
+++ b/packages/types/src/base.ts
@@ -182,6 +182,70 @@ export interface BaseSchema {
    */
   data?: any;
 
+  /**
+   * Data-scope path this node draws its rows/value from — the SDUI data-binding
+   * vocabulary, resolved by `useDataScope()` (`@object-ui/react`).
+   *
+   * ```json
+   * { "type": "list", "bind": "customerNames" }   // → dataSource.customerNames
+   * { "type": "object-kanban", "bind": "app.settings.users" }
+   * ```
+   *
+   * ## Why it is declared HERE and not on each reader (objectui#6357)
+   *
+   * `bind` was read by ten production sites and declared by NO schema shape —
+   * it rode `BaseSchema`'s index signature as `any`, while three separate
+   * documents taught it as an authorable key of EVERY node: this repo's own
+   * `AGENTS.md` §4 ("Every node in the UI tree follows this shape
+   * (`@object-ui/types`)" — `bind?: string`), the published agent-facing
+   * `skills/objectui/rules/protocol.md` ("Every UI component node MUST follow
+   * this shape"), and `content/docs/fields/grid.mdx`.
+   *
+   * Per-component declaration was measured and rejected: it costs nine copies
+   * of one key and buys NOTHING extra, because neither half can refuse the key
+   * on a non-reader either way (see the ceiling below). The class had already
+   * generated FOUR local declarations before this one existed — three spelled
+   * `string`, one spelled `unknown` — which is exactly the "two copies of one
+   * key list is how a list becomes two disagreeing lists" hazard that
+   * `plugin-dashboard/src/schemaHostProps.ts`'s own header warns about. Only
+   * one of the four was a true duplicate of a base member (`ObjectPivotTable`'s,
+   * removed with this card); the other three are load-bearing because their
+   * containing types never reference `BaseSchema` at all, and that disconnection
+   * is objectui#5155 / objectui#6269's defect, not this card's. They are held as
+   * a ratchet in `__tests__/base-bind-declared.test.ts`.
+   *
+   * Precedent for a cross-cutting key honoured by a SUBSET living here:
+   * {@link BaseSchema.placeholder}, declared for every node and read only by
+   * input components.
+   *
+   * ## Readers, and the one documented silent failure
+   *
+   * Only a component that calls `useDataScope` honours it. Measured readers:
+   * `list` and `tree-view` (`@object-ui/components`), and the `object-*`
+   * widgets in `plugin-charts` / `plugin-dashboard` (×2) / `plugin-grid` /
+   * `plugin-kanban` / `plugin-list` / `plugin-timeline`. ⚠️ `data-table` does
+   * NOT: a `bind` on it is ignored and the table renders its header over an
+   * empty body, with no error and no warning (`protocol.md`, and pinned in
+   * `components/src/__tests__/skill-guide-data-table-binding.test.tsx`).
+   * Declaring the key here does not change that, and does not bless it — the
+   * key was already accepted on every node before this declaration existed.
+   *
+   * ## What declaring it buys, and what it does not (objectui#5155 / #6269)
+   *
+   * Same ceiling as the gantt and timeline pins. `BaseSchema` carries an index
+   * signature on the TS side and is `.passthrough()` on the zod side, so an
+   * UNDECLARED key is still accepted by both halves — this did NOT buy
+   * rejection of a misspelling such as `bindTo`. What it DOES buy is the VALUE:
+   * `bind: 42` type-checked and parsed green before this declaration and is
+   * refused by both halves now. That narrowing only refuses what already
+   * crashed — `useDataScope` is `(path?: string)` and resolves via
+   * `path.split('.')`, so a non-string `bind` threw a TypeError at render.
+   *
+   * @example "customerNames"
+   * @example "app.settings.users"
+   */
+  bind?: string;
+
   /**
    * Child components or content.
    * Can be a single component, array of components, or primitive values.
diff --git a/packages/types/src/objectql.ts b/packages/types/src/objectql.ts
index 6c82feaf47..bf8479a893 100644
--- a/packages/types/src/objectql.ts
+++ b/packages/types/src/objectql.ts
@@ -1559,6 +1559,7 @@ type ObjectGridSlotKey =
   | 'aggregations'
   | 'ariaLabel'
   | 'batchActions'
+  | 'bind'
   | 'body'
   | 'bulkActionDefs'
   | 'bulkActions'
@@ -1629,6 +1630,7 @@ type ObjectGridSlotKey =
 type ObjectFormSlotKey =
   | 'allowSkip'
   | 'ariaLabel'
+  | 'bind'
   | 'body'
   | 'buttons'
   | 'cancelText'
diff --git a/packages/types/src/zod/base.zod.ts b/packages/types/src/zod/base.zod.ts
index 7773c28230..a648f06926 100644
--- a/packages/types/src/zod/base.zod.ts
+++ b/packages/types/src/zod/base.zod.ts
@@ -119,6 +119,20 @@ const BaseSchemaCore = z.object({
    */
   data: z.any().optional().describe('Custom data payload'),
 
+  /**
+   * Data-scope path, resolved by `useDataScope()`.
+   *
+   * Mirrors `BaseSchema.bind: string` (`../base.ts`, objectui#6357). The pair
+   * `base.zod.ts#BaseSchema` carries no `KnownDrift` / `UnmirroredDeclared`
+   * entry, so this member is not optional housekeeping: a key declared on the
+   * TS side and missing here reddens `zod-mirror-parity.test.ts` by name.
+   *
+   * `z.string()` and not `z.any()` because that is what the resolver accepts —
+   * `useDataScope` is `(path?: string)` and resolves via `path.split('.')`, so
+   * a non-string value threw at render time and this rejects it at parse time.
+   */
+  bind: z.string().optional().describe('Data-scope binding path (resolved by useDataScope)'),
+
   /**
    * Child components or content
    */