@@ -0,0 +1,19 @@
+---
+'@object-ui/app-shell': patch
+---
+
+fix(app-shell): the Setup position page shows, read-only, what each permission set the position names grants
+
+Clause-②: no
+Metadata-protocol: none
+
+A position grants access only through the permission sets its definition names in `permissionSets`. The position page in Setup → Positions listed those names but showed nothing of what they grant, so an admin had to open every set to see its objects, capabilities and record scopes.
+
+- **One preview per named set.** Under the position's definition, beside its holders, the page now shows each named set's permission preview: the object × capability grid with each object's read and write scope, field-level overrides, row-level policies, system permissions and tabs. The previews follow the order the position names the sets. Each is headed by the set's name, which links to the set's own page.
+- **No merge, no editing.** Each preview shows one set as stored. The page does not compute what the sets add up to, and nothing in the previews is editable. A set is changed on its own page.
+- **A set that does not load.** A named set the server does not serve shows one line, `Permission set "NAME" was not found.`, for that set only; the other previews still show. A read the server refuses says that, with the server's sentence, instead of "not found".
+- **No sets.** A position that names no permission sets says so.
+
+The permission-set page itself is unchanged: its matrix already shows each object's read and write scope.
+
+What to do: nothing. No spec key, stored shape or API changes.
@@ -0,0 +1,159 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * The Setup position page shows, read-only, what each permission set the
+ * position names grants (objectstack#26187, ruling 6416233738 Q1).
+ *
+ * One `PermissionPreview` per named set, in the order the position names them,
+ * each under the set's name and a link to the set's page. No union of the sets
+ * is computed here and nothing is editable. A named set the server does not
+ * serve says so on one line, for that set only; a set whose read is refused
+ * says that instead, since a refused read is not an absent set. A position that
+ * names no set says so.
+ *
+ * The sets are read through the metadata client the page already uses
+ * (`client.get('permission', name)`), stubbed here.
+ */
+
+import '@testing-library/jest-dom/vitest';
+import * as React from 'react';
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { render, screen, cleanup, within, waitFor } from '@testing-library/react';
+import { MemoryRouter, Route, Routes } from 'react-router-dom';
+
+/** The sets the stubbed server serves, by name. */
+const SERVED: Record<string, Record<string, unknown>> = {
+  sales_read: {
+    name: 'sales_read',
+    label: 'Sales read',
+    objects: { account: { allowRead: true, readScope: 'unit_and_below' } },
+  },
+  sales_write: {
+    name: 'sales_write',
+    label: 'Sales write',
+    objects: { opportunity: { allowRead: true, allowEdit: true, readScope: 'org', writeScope: 'own' } },
+  },
+};
+
+/** Names whose read the stubbed server refuses. */
+const REFUSED = new Set<string>(['locked_set']);
+
+const mockClient = {
+  get: vi.fn(async (type: string, name: string) => {
+    if (type !== 'permission') return null;
+    if (REFUSED.has(name)) throw new Error('You do not have permission to perform this action.');
+    return SERVED[name] ?? null;
+  }),
+};
+
+vi.mock('./useMetadata', async (importOriginal) => ({
+  ...(await importOriginal<typeof import('./useMetadata')>()),
+  useMetadataClient: () => mockClient,
+}));
+
+import { PositionPermissionSetsSection } from './PositionPermissionSetsSection';
+
+afterEach(() => {
+  cleanup();
+  vi.clearAllMocks();
+});
+
+/**
+ * Mounted as the console mounts the page: the element of the `metadata/:type/:name`
+ * route (`AppContent.tsx`), since a path-relative link resolves against the
+ * matched route's pathname.
+ */
+function mount(permissionSets: unknown) {
+  render(
+    <MemoryRouter initialEntries={['/apps/setup/metadata/position/sales_rep?scope=environment']}>
+      <Routes>
+        <Route
+          path="/apps/:appName/metadata/:type/:name"
+          element={<PositionPermissionSetsSection name="sales_rep" draft={{ name: 'sales_rep', permissionSets }} />}
+        />
+      </Routes>
+    </MemoryRouter>,
+  );
+}
+
+/** The rendered set blocks, in document order. */
+const setBlocks = () => screen.getAllByTestId('position-permission-set');
+
+describe('the position page shows each named permission set read-only (#26187)', () => {
+  it('two named sets give two previews, in declared order, each with its own scopes', async () => {
+    mount(['sales_write', 'sales_read']);
+
+    await waitFor(() => expect(screen.getAllByTestId('position-permission-set-preview')).toHaveLength(2));
+    const blocks = setBlocks();
+    expect(blocks.map((b) => b.getAttribute('data-set-name'))).toEqual(['sales_write', 'sales_read']);
+
+    // Each block's heading is the set's name, linking to the set's page in the
+    // same (environment) scope.
+    const headings = screen.getAllByRole('heading', { level: 3 });
+    expect(headings.map((h) => h.textContent)).toEqual(['sales_write', 'sales_read']);
+    expect(within(blocks[0]).getByRole('link', { name: 'sales_write' })).toHaveAttribute(
+      'href',
+      '/apps/setup/metadata/permission/sales_write?scope=environment',
+    );
+    expect(within(blocks[1]).getByRole('link', { name: 'sales_read' })).toHaveAttribute(
+      'href',
+      '/apps/setup/metadata/permission/sales_read?scope=environment',
+    );
+
+    // Each preview shows its OWN set's object rows and scopes: no union.
+    expect(within(blocks[0]).getByText('opportunity')).toBeInTheDocument();
+    expect(within(blocks[0]).queryByText('account')).toBeNull();
+    expect(within(blocks[0]).getByText('org')).toBeInTheDocument();
+    expect(within(blocks[0]).getByText('own')).toBeInTheDocument();
+    expect(within(blocks[1]).getByText('account')).toBeInTheDocument();
+    expect(within(blocks[1]).queryByText('opportunity')).toBeNull();
+    expect(within(blocks[1]).getByText('unit+below')).toBeInTheDocument();
+
+    expect(mockClient.get).toHaveBeenCalledWith('permission', 'sales_write');
+    expect(mockClient.get).toHaveBeenCalledWith('permission', 'sales_read');
+  });
+
+  it('is read-only: no form control is offered', async () => {
+    mount(['sales_write']);
+    await screen.findByTestId('position-permission-set-preview');
+    const block = setBlocks()[0];
+    expect(within(block).queryAllByRole('checkbox')).toHaveLength(0);
+    expect(within(block).queryAllByRole('combobox')).toHaveLength(0);
+    expect(within(block).queryAllByRole('button')).toHaveLength(0);
+  });
+
+  it('a named set the server does not serve shows one "not found" line, and only for that set', async () => {
+    mount(['sales_read', 'ghost_set', 'sales_write']);
+
+    const missing = await screen.findByTestId('position-permission-set-missing');
+    expect(missing).toHaveTextContent('ghost_set');
+    expect(missing).toHaveTextContent(/not found/i);
+    await waitFor(() => expect(screen.getAllByTestId('position-permission-set-preview')).toHaveLength(2));
+    expect(setBlocks().map((b) => b.getAttribute('data-set-name'))).toEqual(['sales_read', 'ghost_set', 'sales_write']);
+    expect(within(setBlocks()[1]).queryByTestId('position-permission-set-preview')).toBeNull();
+    expect(screen.getAllByTestId('position-permission-set-missing')).toHaveLength(1);
+  });
+
+  it('a refused read is said as a refusal, not as "not found"', async () => {
+    mount(['locked_set', 'sales_read']);
+
+    const failed = await screen.findByTestId('position-permission-set-read-failed');
+    expect(failed).toHaveTextContent('locked_set');
+    expect(failed).toHaveTextContent('You do not have permission to perform this action.');
+    expect(screen.queryByTestId('position-permission-set-missing')).toBeNull();
+    await waitFor(() => expect(screen.getAllByTestId('position-permission-set-preview')).toHaveLength(1));
+  });
+
+  it('a position that names no set shows the empty state and reads nothing', async () => {
+    mount([]);
+    expect(await screen.findByTestId('position-permission-sets-empty')).toBeInTheDocument();
+    expect(screen.queryByTestId('position-permission-set')).toBeNull();
+    expect(mockClient.get).not.toHaveBeenCalled();
+  });
+
+  it('a position with no permissionSets key at all shows the same empty state', async () => {
+    mount(undefined);
+    expect(await screen.findByTestId('position-permission-sets-empty')).toBeInTheDocument();
+    expect(mockClient.get).not.toHaveBeenCalled();
+  });
+});
@@ -0,0 +1,173 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * PositionPermissionSetsSection — what the permission sets a position names
+ * grant, read-only, on the Setup catalog's position page (objectstack#26187,
+ * ruling 6416233738 Q1; ADR-0131 D4).
+ *
+ * A position grants access only through the permission sets its definition
+ * names (`permissionSets`). The position page used to list those names and show
+ * nothing of what they grant, so an admin reviewing a position could not see an
+ * object, a capability or a record scope without opening every set in turn.
+ * This section renders, for each named set, that set's own `PermissionPreview`:
+ *
+ *  - one preview per named set, in the order the position names them, each
+ *    under the set's name and a link to the set's page (same catalog scope);
+ *  - no union of the sets is computed here: what a holder ends up with is the
+ *    server's answer (the authorization resolver), not a client-side merge;
+ *  - nothing is editable: the preview gets no `onPatch`, and a set is changed
+ *    on its own page;
+ *  - a named set the server does not serve (`client.get` answers `null` on a
+ *    404) shows one "not found" line for that set only; a refused or failed
+ *    read is said as such, in the server's words, because a refused read is not
+ *    an absent set;
+ *  - a position that names no set says so.
+ *
+ * The names are read from the page's draft, as the position preview above this
+ * section reads them, so the list follows the definition on screen. Each set is
+ * read through the console metadata client the page itself uses.
+ */
+
+import * as React from 'react';
+import { Link, useSearchParams } from 'react-router-dom';
+import { AlertCircle, Loader2, ShieldCheck } from 'lucide-react';
+import { useMetadataClient } from './useMetadata.js';
+import { useMetadataLocale, t, tFormat } from './i18n.js';
+import { environmentScopeSuffix } from './catalog-scope.js';
+import { PermissionPreview } from './previews/PermissionPreview.js';
+
+export interface PositionPermissionSetsSectionProps {
+  /** The position's machine name. */
+  name: string;
+  /** The position definition on screen; only `permissionSets` is read. */
+  draft: Readonly<Record<string, unknown>>;
+}
+
+/** One named set's read, as this section shows it. */
+type SetRead =
+  | { state: 'loading' }
+  | { state: 'loaded'; body: Record<string, unknown> }
+  | { state: 'missing' }
+  | { state: 'failed'; sentence: string };
+
+/** The names a position definition declares, in order; anything else declares none. */
+export function declaredPermissionSets(draft: Readonly<Record<string, unknown>>): string[] {
+  const value = draft.permissionSets;
+  return Array.isArray(value) ? value.filter((s): s is string => typeof s === 'string' && s !== '') : [];
+}
+
+/** The server's sentence out of a failed read, or `''` when it gave none. */
+function failureSentence(err: unknown): string {
+  return err instanceof Error && err.message ? err.message : '';
+}
+
+export function PositionPermissionSetsSection({ draft }: PositionPermissionSetsSectionProps) {
+  const client = useMetadataClient();
+  const locale = useMetadataLocale();
+  const [searchParams] = useSearchParams();
+  const scopeSuffix = environmentScopeSuffix(searchParams);
+
+  const declared = declaredPermissionSets(draft);
+  // The read effect keys on the list's content, not on the draft object, so an
+  // edit to another field of the position does not re-read every set.
+  const declaredKey = JSON.stringify(declared);
+  const [reads, setReads] = React.useState<Record<string, SetRead>>({});
+
+  React.useEffect(() => {
+    const names: string[] = JSON.parse(declaredKey);
+    const unique = Array.from(new Set(names));
+    let cancelled = false;
+    setReads(Object.fromEntries(unique.map((n) => [n, { state: 'loading' } as SetRead])));
+    for (const setName of unique) {
+      client
+        .get<Record<string, unknown>>('permission', setName)
+        .then(
+          (body): SetRead => (body ? { state: 'loaded', body } : { state: 'missing' }),
+          (err: unknown): SetRead => ({ state: 'failed', sentence: failureSentence(err) }),
+        )
+        .then((read) => {
+          if (!cancelled) setReads((prev) => ({ ...prev, [setName]: read }));
+        });
+    }
+    return () => {
+      cancelled = true;
+    };
+  }, [client, declaredKey]);
+
+  return (
+    <section className="mt-6 rounded-md border" data-testid="position-permission-sets">
+      <div className="px-4 py-3 border-b">
+        <div className="flex items-center gap-2 text-sm font-medium">
+          <ShieldCheck className="h-4 w-4 text-muted-foreground" />
+          <span>{t('engine.position.sets.title', locale)}</span>
+          {declared.length > 0 && (
+            <span className="text-xs text-muted-foreground font-normal">{declared.length}</span>
+          )}
+        </div>
+        {declared.length > 0 && (
+          <p className="mt-0.5 text-xs text-muted-foreground">{t('engine.position.sets.hint', locale)}</p>
+        )}
+      </div>
+      <div className="px-4 py-3">
+        {declared.length === 0 ? (
+          <p className="text-xs text-muted-foreground" data-testid="position-permission-sets-empty">
+            {t('engine.position.sets.empty', locale)}
+          </p>
+        ) : (
+          <ol className="space-y-3">
+            {declared.map((setName, i) => {
+              const read = reads[setName] ?? { state: 'loading' };
+              return (
+                <li
+                  key={`${i}:${setName}`}
+                  data-testid="position-permission-set"
+                  data-set-name={setName}
+                  className="space-y-1.5"
+                >
+                  <h3 className="text-xs font-medium">
+                    <Link
+                      to={`../../permission/${encodeURIComponent(setName)}${scopeSuffix}`}
+                      relative="path"
+                      className="font-mono hover:underline"
+                      title={t('engine.position.sets.open', locale)}
+                    >
+                      {setName}
+                    </Link>
+                  </h3>
+                  {read.state === 'loading' && (
+                    <p className="flex items-center gap-1.5 text-xs text-muted-foreground">
+                      <Loader2 className="h-3 w-3 animate-spin" />
+                      {t('engine.position.sets.loading', locale)}
+                    </p>
+                  )}
+                  {read.state === 'missing' && (
+                    <p className="text-xs text-muted-foreground" data-testid="position-permission-set-missing">
+                      {tFormat('engine.position.sets.notFound', locale, { name: setName })}
+                    </p>
+                  )}
+                  {read.state === 'failed' && (
+                    <p
+                      className="flex items-start gap-1.5 text-xs text-destructive"
+                      data-testid="position-permission-set-read-failed"
+                    >
+                      <AlertCircle className="h-3.5 w-3.5 mt-px shrink-0" />
+                      <span>
+                        {tFormat('engine.position.sets.readFailed', locale, { name: setName })}
+                        {read.sentence && <> {read.sentence}</>}
+                      </span>
+                    </p>
+                  )}
+                  {read.state === 'loaded' && (
+                    <div data-testid="position-permission-set-preview">
+                      <PermissionPreview type="permission" name={setName} draft={read.body} locale={locale} />
+                    </div>
+                  )}
+                </li>
+              );
+            })}
+          </ol>
+        )}
+      </div>
+    </section>
+  );
+}