@@ -0,0 +1,21 @@
+---
+'@object-ui/plugin-grid': patch
+---
+
+A grouped `object-grid` labels its group headers from the object field's
+`options` only; a column's `options` no longer relabels them (objectui#11544).
+
+`ListColumnSchema` (`@objectstack/spec/ui`) is a strict object with no
+`options` member, so a view that authors `options` on a column is refused at
+publish with `unrecognized_keys`, and `ObjectGridSchema` refuses the column
+too. `ObjectGrid`'s group-header label memo (`groupValueFormatter`) read that
+key anyway: a column's `options` won over the object field's, and decided both
+the header text and, through `order`, the order of the groups. That read is
+retired rather than declared upstream; the authors measurement behind the
+ruling found no view that writes a column-level `options`.
+
+**Behaviour change.** A grid handed a column that carries `options` (which
+validation refuses) now shows the object field's option labels in the group
+headers, or the stored value when the field has no options. A column's
+declared `type` still respells a grouped value (a `boolean` column reads
+Yes / No), and a grid whose columns carry no `options` is unchanged.
@@ -2974,7 +2974,7 @@ const MEMBER_PINS: Record<string, MemberPin> = {
   },
   'object-grid.grouping': {
     file: 'packages/plugin-grid/src/__tests__/gridGroupingMembers-8071.test.tsx',
-    pins: 'The one member `GroupingConfigSchema` declares (`fields`) and the three its strict entries declare (`field`, `order`, `collapsed`), at the group headers the grid paints AND at the projection it asks the server for. `order` sorts the headers by their RENDERED LABEL rather than by the stored value, `collapsed` is a DEFAULT that the first click inverts rather than a state, `fields` is ORDERED so the second entry nests inside the first and each level sorts on its own entry, and an unusable entry (a `null` hole, the bare-string shorthand the strict schema refuses, a blank name) is DROPPED — never coerced, never fatal — with the usable one still grouping. The query half is what keeps the screen honest: a grouped field the columns never mention is UNIONED into `$select`, because without it the server never returns it and ONE `(empty)` group holds every record (objectui#7179); the entries it groups by and the entries it projects are asserted as the same set. ⭐ THE SHARED MEMO with `columns` is pinned here, and it is what makes these two keys non-disjoint: `groupValueFormatter` derives the header labels from `schema.grouping` AND `schema.columns`, so `columns[].type: \'boolean\'` respells a grouped `"true"`/`"false"` as Yes/No, and because `order` sorts the rendered labels a column override MOVES the groups. ⚠️ That memo also reads `columns[].options`, which `ListColumnSchema` does not declare and, being strict, REFUSES at publish — the `declared != enforced` split, same family objectui#6458 retired from the cell branch, outside the region `columnReadBoundary-6458` bounds. Pinned as behaviour with its own absent-member control and handed back as a finding, ⛔ not repaired here. New file (objectui#8071 slice 17).',
+    pins: 'The one member `GroupingConfigSchema` declares (`fields`) and the three its strict entries declare (`field`, `order`, `collapsed`), at the group headers the grid paints AND at the projection it asks the server for. `order` sorts the headers by their RENDERED LABEL rather than by the stored value, `collapsed` is a DEFAULT that the first click inverts rather than a state, `fields` is ORDERED so the second entry nests inside the first and each level sorts on its own entry, and an unusable entry (a `null` hole, the bare-string shorthand the strict schema refuses, a blank name) is DROPPED — never coerced, never fatal — with the usable one still grouping. The query half is what keeps the screen honest: a grouped field the columns never mention is UNIONED into `$select`, because without it the server never returns it and ONE `(empty)` group holds every record (objectui#7179); the entries it groups by and the entries it projects are asserted as the same set. ⭐ THE SHARED MEMO with `columns` is pinned here, and it is what makes these two keys non-disjoint: `groupValueFormatter` derives the header labels from `schema.grouping` AND `schema.columns`, so `columns[].type: \'boolean\'` respells a grouped `"true"`/`"false"` as Yes/No. A select value\'s header LABEL comes from the object field\'s `options` only, and because `order` sorts the rendered labels the field\'s options MOVE the groups. The memo\'s former read of `columns[].options`, which `ListColumnSchema` does not declare and, being strict, REFUSES at publish, is retired (objectui#11544): a column carrying `options` beside the field\'s is pinned as not read, with a no-field-options control. New file (objectui#8071 slice 17).',
   },
   'object-grid.sort': {
     file: 'packages/plugin-grid/src/__tests__/gridArrayArmOrderby-8973.test.tsx',
 
@@ -2975,6 +2975,7 @@ export const ObjectGrid: React.FC<ObjectGridComponentProps> = ({
   // Build a per-field value formatter so group headers display the human
   // readable label for select/boolean fields rather than the raw value
   // (e.g. "In Progress" instead of "in_progress", "Yes" instead of "true").
+  // A select value's label is the OBJECT FIELD's option label (objectui#11544).
   const groupValueFormatter = React.useMemo(() => {
     // [objectui#7217] ONE normalized entry list, shared with the
     // `useGroupedData` call below. Reading `grouping.fields` raw here threw
@@ -2993,12 +2994,20 @@ export const ObjectGrid: React.FC<ObjectGridComponentProps> = ({
     for (const gf of groupingFields) {
       const fieldName = gf.field;
       const objectDefField = objectFields?.[fieldName];
-      // Try to find a column override matching this field for type/options
-      const cols = normalizeColumns(schema.columns) as any[] | undefined;
-      const colOverride = cols?.find?.((c) => typeof c === 'object' && c?.field === fieldName);
+      // The authored column for this field may respell its TYPE — `type` is a
+      // declared `ListColumn` member, and it is how a `"true"` / `"false"` text
+      // value reads Yes / No. It never supplies the value LABELS
+      // (objectui#11544): `options` is not a `ListColumn` member, and the
+      // strict `ListColumnSchema` refuses it at publish, so the labels come
+      // from the object field's `options` only. The lookup is typed as
+      // `ListColumn` so a read of an undeclared column member does not compile.
+      const cols: ReadonlyArray<string | ListColumn> = normalizeColumns(schema.columns) ?? [];
+      const colOverride = cols.find(
+        (c): c is ListColumn => typeof c === 'object' && c !== null && c.field === fieldName,
+      );
 
       const type = colOverride?.type || objectDefField?.type;
-      const rawOptions = colOverride?.options || objectDefField?.options;
+      const rawOptions = objectDefField?.options;
 
       const optionsMap = new Map<string, string>();
       if (Array.isArray(rawOptions) && rawOptions.length > 0) {
 
@@ -26,26 +26,26 @@
  * ⭐ **`grouping` and `columns` ARE NOT DISJOINT, and this file is where that
  * shows.** `groupValueFormatter` derives the group-header labels from
  * `schema.grouping` AND `schema.columns` in one memo: the column override for a
- * grouped field decides how its value is SPELLED in the header. Slice 16
- * measured the four `object-grid` keys as separable and recorded exactly this
- * qualification; the two cases below are it, in behaviour.
+ * grouped field decides, through its declared `type`, how its value is SPELLED
+ * in the header. Slice 16 measured the four `object-grid` keys as separable
+ * and recorded exactly this qualification; the `columns[].type` case below is
+ * it, in behaviour.
  *
- * ⚠️ **One of those two reads a member `ListColumnSchema` REFUSES.** The memo
- * reads `columns[].options`, which is not among `ListColumn`'s fourteen
- * declared members — a strict object, so an author who writes it is refused at
- * publish with `unrecognized_keys` while this renderer honours it. That is the
- * `declared != enforced` split AGENTS.md #0.1 exists to stop, and it is the
- * same family objectui#6458 retired from `generateColumns()`'s cell branch;
- * `columnReadBoundary-6458` bounds THAT branch to the empty set and this memo
- * is outside it. ⛔ It is pinned below AS BEHAVIOUR and reported as a finding —
- * ⛔ not repaired here, because the repair is a retirement decision with its own
- * authors measurement, not a member pin.
+ * ⭐ **A select value's header LABEL comes from the OBJECT FIELD's `options`,
+ * and from nothing a column authors (objectui#11544).** The memo used to read
+ * `columns[].options` first, which is not among `ListColumn`'s fourteen
+ * declared members: the strict `ListColumnSchema` refuses it at publish with
+ * `unrecognized_keys`, while this renderer honoured it. That read is retired,
+ * not declared upstream; the authors measurement behind the ruling found no
+ * view that writes a column-level `options`. The label cases below pin the
+ * field's labels, and the column `options` beside them is the off-contract
+ * input whose labels must not appear.
  *
  * ⛔ What a declaration can never publish:
  *
  *   - **`order` sorts the group HEADERS by their rendered LABEL, not by the
- *     stored value.** So the same member produces a different order once a
- *     column override renames the values it sorts.
+ *     stored value.** So the same member produces a different order once the
+ *     object field's options rename the values it sorts.
  *   - **`collapsed` is a DEFAULT, not a state.** It decides what an untouched
  *     group looks like, and the first click inverts that default rather than
  *     setting it.
@@ -78,10 +78,16 @@ const ROWS = [
   { id: '3', name: 'Alan', stage: 'won', flag: 'false' },
 ];
 
-/** Render a grouped `object-grid` over inline rows — no host, no dataSource. */
+/**
+ * Render a grouped `object-grid` over inline rows — no dataSource. An
+ * `objectFields` catalogue is handed down the way a host hands one down (the
+ * runtime prop, never authored metadata), which is how the object field's
+ * `options` reach the grid without a schema read.
+ */
 function renderGrouped(
   grouping: unknown,
   columns: unknown[] = [{ field: 'name', label: 'Name' }],
+  objectFields?: Record<string, unknown>,
 ) {
   return render(
     <ActionProvider>
@@ -92,11 +98,23 @@ function renderGrouped(
           columns,
           grouping,
         } as any}
+        objectFields={objectFields}
       />
     </ActionProvider>,
   );
 }
 
+/** The object field `stage` as a select whose options relabel both values. */
+const stageField = (labels: { won: string; lost: string }) => ({
+  stage: {
+    type: 'select',
+    options: [
+      { value: 'won', label: labels.won },
+      { value: 'lost', label: labels.lost },
+    ],
+  },
+});
+
 /** Every group header label, in render order. */
 const groupLabels = (): string[] =>
   Array.from(document.querySelectorAll('.group-label')).map((el) => (el.textContent ?? '').trim());
@@ -256,47 +274,71 @@ describe('object-grid `grouping` × `columns` — the SHARED memo (objectui#8071
     await settled();
     expect(groupLabels()).toEqual(['No', 'Yes']);
   });
+});
 
-  it('⚠️ an UNDECLARED `columns[].options` decides the header label too — pinned as behaviour', async () => {
-    // `options` is NOT a member of `ListColumnSchema`, which is strict: an
-    // author who writes it is refused at publish. This memo reads it anyway,
-    // and the header is where it shows. Pinned as the behaviour that is there,
-    // reported as a finding, ⛔ not repaired here.
+describe('object-grid group-header LABELS come from the object field (objectui#11544)', () => {
+  it('the object field\'s `options` decide the header label, and a column `options` beside them is not read', async () => {
+    // The field's labels reach the header.
+    renderGrouped(
+      { fields: [{ field: 'stage' }] },
+      [{ field: 'stage', label: 'Stage' }],
+      stageField({ won: 'Closed Won', lost: 'Closed Lost' }),
+    );
+    await settled();
+    expect(groupLabels()).toEqual(['Closed Lost', 'Closed Won']);
+    cleanup();
+    // The retirement: `options` is not a `ListColumn` member and the strict
+    // `ListColumnSchema` refuses it at publish, so a column carrying it is
+    // off-contract input. Its labels never reach the header; the field's do.
+    renderGrouped(
+      { fields: [{ field: 'stage' }] },
+      [
+        {
+          field: 'stage',
+          label: 'Stage',
+          options: [
+            { value: 'won', label: 'Column Won' },
+            { value: 'lost', label: 'Column Lost' },
+          ],
+        },
+      ],
+      stageField({ won: 'Closed Won', lost: 'Closed Lost' }),
+    );
+    await settled();
+    expect(groupLabels()).toEqual(['Closed Lost', 'Closed Won']);
+    cleanup();
+    // With no field options, the same column `options` relabels nothing: the
+    // header shows the stored values.
     renderGrouped({ fields: [{ field: 'stage' }] }, [
       {
         field: 'stage',
         label: 'Stage',
         options: [
-          { value: 'won', label: 'Closed Won' },
-          { value: 'lost', label: 'Closed Lost' },
+          { value: 'won', label: 'Column Won' },
+          { value: 'lost', label: 'Column Lost' },
         ],
       },
     ]);
     await settled();
-    expect(groupLabels()).toEqual(['Closed Lost', 'Closed Won']);
-    cleanup();
-    // The control that makes the row above a reading of the MEMBER rather than
-    // of the values: the same grouping, the same column, no `options`.
-    renderGrouped({ fields: [{ field: 'stage' }] }, [{ field: 'stage', label: 'Stage' }]);
-    await settled();
     expect(groupLabels()).toEqual(['lost', 'won']);
   });
 
-  it('`order` sorts the RENDERED labels, so a column override moves the groups', async () => {
+  it('`order` sorts the RENDERED labels, so the field\'s options move the groups', async () => {
     // `lost` < `won` on the stored values; `Closed Won` < `Zeta` on the
     // rendered ones. Same `order: 'asc'`, different order — which is only
-    // visible because the two members are read in one memo.
-    renderGrouped({ fields: [{ field: 'stage', order: 'asc' }] }, [
-      {
-        field: 'stage',
-        label: 'Stage',
-        options: [
-          { value: 'won', label: 'Closed Won' },
-          { value: 'lost', label: 'Zeta' },
-        ],
-      },
-    ]);
+    // visible because `order` sorts what the label memo produced.
+    renderGrouped(
+      { fields: [{ field: 'stage', order: 'asc' }] },
+      [{ field: 'name', label: 'Name' }],
+      stageField({ won: 'Closed Won', lost: 'Zeta' }),
+    );
     await settled();
     expect(groupLabels()).toEqual(['Closed Won', 'Zeta']);
+    cleanup();
+    // Control: the same `order` without the field's labels sorts the stored
+    // values, so the row above is a reading of the labels, not of `order`.
+    renderGrouped({ fields: [{ field: 'stage', order: 'asc' }] });
+    await settled();
+    expect(groupLabels()).toEqual(['lost', 'won']);
   });
 });