@@ -0,0 +1,35 @@
+---
+'@objectstack/platform-objects': patch
+---
+
+fix(platform-objects): the user directory no longer returns another user's sign-in phone number to non-admin readers
+
+Clause-②: no (narrowing)
+Metadata-protocol: none
+
+<!-- adr-0087: not-required (no-migration-prescription) No metadata moves: no spec key, authorable spelling, export or stored shape is removed, renamed or re-shaped, so there is nothing for `objectstack migrate meta` to rewrite. What narrows is the shipped non-admin permission sets' field read on two `sys_user` columns: the two fields change their declared field group, and the group is the declaration those sets already read. The remedy is a permission set's existing `fields` entry, never a rewrite of anyone's code or metadata. No exported declaration is removed or narrowed (not runtime-interface-only or type-surface-only); the package publishes (not unpublished); no ADR-0087 id is named or touched (not registered or already-registered). -->
+
+**BREAKING** (an accept-set narrowing), shipped as `patch`: a non-protocol narrowing takes `patch` and keeps this banner and its ADR-0087 disposition.
+
+`sys_user.phone_number` and `sys_user.phone_number_verified` are the better-auth phone sign-in identifier and its verified flag — account administration data, not directory data. Both are now declared in the identity object's `Admin` field group, which the shipped permission sets already treat as field-level security: the non-admin sets (`member_default`, `viewer_readonly`, `external_default`) mark every field of that group `readable: false`, and the admin sets (`admin_full_access`, `organization_admin` and its no-bypass variant) keep it.
+
+**FROM.** On `origin/main`, an org member holding only the non-admin sets could, on the generic data door (`GET /api/v1/data/sys_user`, `POST /api/v1/data/sys_user/query`, the record read and the activity stream):
+
+- read both fields on every org peer's row and on their own;
+- write a **filter** naming either field, and have it evaluated;
+- **sort** by either field;
+- **group by** either field, or name it as an **aggregate** operand;
+- run a `$search` whose default field set scanned `phone_number` (it is `searchable: true`, one of the object's three searchable fields beside `name` and `email`).
+
+**TO.** For the same member:
+
+- **Row position.** Both fields are withheld from every `sys_user` row served — a colleague's direct read, the list read, a `fields=` projection naming them, and the activity stream's recorded changes. The member's **own row** is withheld them too: field-level read security does not distinguish rows (ADR-0066).
+- **Filter, sort, group-by, aggregate.** A query naming either field in its filter (`where` / `having`), its sort, its group-by or an aggregation is refused `403 PERMISSION_DENIED` before the engine is asked, at every verb that carries a query — a bulk write's own predicate included.
+- **`$search`.** The default search set is narrowed **silently**: `phone_number` is dropped from the fields a member's `$search` scans, so a user picker keeps answering on `name` and `email`, and a search for a colleague's number returns no row rather than a refusal.
+- **Writes.** Both fields stay `readonly: true` and are written through better-auth only, so no reachable write changes.
+
+**Unaffected.** Platform admins and organization admins read, filter, sort and search both fields exactly as before. System- and auth-context readers — sign-in by phone, SMS delivery, the admin import's match on `phone_number`, the better-auth adapter — read under a context no permission set reaches. The signed-in user's own number is read from the auth session: better-auth's session user carries both phone fields when the phone-number sign-in plugin is enabled.
+
+**Field group.** Wherever a form lays fields out by their declared group, the two fields now sit in `Admin` instead of `Account`.
+
+**Grant-back.** No configuration change is needed for shipped apps. A deployment that wants org members to keep reading, filtering on or searching colleagues' phone numbers grants a permission set naming `sys_user.phone_number` (and `sys_user.phone_number_verified`) with `readable: true` in its `fields` entries; field grants merge most-permissively, so that one set out-votes the baseline's withhold. A client that filtered or sorted members' `sys_user` queries on either field drops that predicate or runs it with an administrator's grant.
@@ -916,13 +916,28 @@ export const SysUser = ObjectSchema.create({
     // #2766 V1.5 — phone-number sign-in identifier (better-auth phoneNumber
     // plugin, mapped via buildPhoneNumberPluginSchema). Unique when present;
     // null for email-only accounts. Written through better-auth, not CRUD.
+    //
+    // Declared in the `Admin` group, with `phone_number_verified` below, on
+    // purpose: a sign-in identifier is account-administration data, not
+    // directory data. The group is the declaration the shipped permission sets
+    // read (`identityAdminFieldSecurity` in plugin-security's
+    // `default-permission-sets.ts`): the non-admin sets (`member_default`,
+    // `viewer_readonly`, `external_default`) mark every group field
+    // `readable: false` and the admin sets keep it, so an org member reading
+    // the user directory is served a colleague's name and email but not their
+    // sign-in phone number. Field-level read security is row-blind (ADR-0066,
+    // 2026-10-26 note), so the member's OWN row on the generic data API is
+    // withheld it too; the holder's own number is read through auth context
+    // (better-auth's session user, which returns both phone fields), as every
+    // other group field is. Moving either field out of the group serves it to
+    // every org peer again.
     phone_number: Field.text({
       label: 'Phone Number',
       required: false,
       readonly: true,
       searchable: true,
       maxLength: 32,
-      group: 'Account',
+      group: 'Admin',
       description:
         'Sign-in phone number (E.164 recommended). Unique per user; managed by ' +
         'better-auth when the phoneNumber plugin is enabled.',
@@ -932,7 +947,7 @@ export const SysUser = ObjectSchema.create({
       label: 'Phone Verified',
       defaultValue: false,
       readonly: true,
-      group: 'Account',
+      group: 'Admin', // withheld from org peers with `phone_number` (see the note above it)
       description:
         'Whether the phone number has been verified (OTP verification requires ' +
         'SMS infrastructure; false until that ships). System-managed.',
 
@@ -39,6 +39,7 @@ import type { PermissionSet } from '@objectstack/spec/security';
 import { ADMIN_FULL_ACCESS, ORGANIZATION_ADMIN_GRANTS } from '@objectstack/spec';
 import { SysUser } from '@objectstack/platform-objects/identity';
 import { PermissionEvaluator } from './permission-evaluator.js';
+import { FieldMasker } from './field-masker.js';
 import { defaultPermissionSets } from './objects/default-permission-sets.js';
 
 const IDENTITY = 'sys_user';
@@ -58,6 +59,12 @@ const DECLARED_ADMIN_GROUP: string[] = Object.entries(SysUser.fields as Record<s
  */
 const PEER_DIRECTORY_FIELDS = ['name', 'email', 'image', 'banned'];
 
+/**
+ * The better-auth phone sign-in identifier and its verified flag — account
+ * administration data, declared inside the group so org peers are withheld it.
+ */
+const SIGN_IN_PHONE_FIELDS = ['phone_number', 'phone_number_verified'];
+
 const ADMIN_SETS = [ADMIN_FULL_ACCESS, ...ORGANIZATION_ADMIN_GRANTS];
 const WITHHOLDING_SETS = ['member_default', 'viewer_readonly', 'external_default'];
 
@@ -90,6 +97,12 @@ describe('[#21237] the identity object Admin group — withheld from org peers,
     for (const control of PEER_DIRECTORY_FIELDS) expect(DECLARED_ADMIN_GROUP).not.toContain(control);
   });
 
+  it('the sign-in phone number and its verified flag are declared inside the group (a sign-in identifier is not directory data)', () => {
+    // Moving either back out of the group serves a colleague's sign-in phone
+    // number to every org member through the user directory.
+    for (const field of SIGN_IN_PHONE_FIELDS) expect(DECLARED_ADMIN_GROUP, field).toContain(field);
+  });
+
   it.each(WITHHOLDING_SETS)('%s withholds exactly the declared group (readable: false), and nothing else on the identity object', (name) => {
     const entries = identityFieldEntries(setByName(name));
     expect(Object.keys(entries).sort()).toEqual(DECLARED_ADMIN_GROUP);
@@ -144,6 +157,21 @@ describe('[#21237] the identity object Admin group — withheld from org peers,
       for (const field of DECLARED_ADMIN_GROUP) expect(perms[field]?.readable, field).toBe(false);
     });
 
+    it('an org member is withheld the sign-in phone fields, and the masker strips them from a colleague row it serves', () => {
+      const perms = mask(['member_default']);
+      for (const field of SIGN_IN_PHONE_FIELDS) expect(perms[field], field).toEqual({ readable: false, editable: false });
+      const colleague = { id: 'u2', name: 'Colleague', email: 'c@example.test', phone_number: '+15550000002', phone_number_verified: true };
+      const served = new FieldMasker().maskResults([colleague], perms, IDENTITY) as Record<string, unknown>[];
+      expect(served[0]).toEqual({ id: 'u2', name: 'Colleague', email: 'c@example.test' });
+    });
+
+    it.each(ADMIN_SETS)('an admin holding %s keeps the sign-in phone fields, and the masker serves them', (name) => {
+      const perms = mask(['member_default', name]);
+      for (const field of SIGN_IN_PHONE_FIELDS) expect(perms[field], field).toEqual({ readable: true, editable: true });
+      const colleague = { id: 'u2', name: 'Colleague', phone_number: '+15550000002', phone_number_verified: true };
+      expect(new FieldMasker().maskResults([colleague], perms, IDENTITY)).toEqual([colleague]);
+    });
+
     it.each(ADMIN_SETS)('an admin holding %s on top of the baseline keeps every group field, readable and editable', (name) => {
       const perms = mask(['member_default', name]);
       for (const field of DECLARED_ADMIN_GROUP) {
 
@@ -278,11 +278,15 @@ function identityAdminGroupFields(): string[] {
  * member's user-context write naming one is refused by the field-level write
  * gate. Every reader of these fields on a member's OWN row reads through system
  * or auth context (the auth manager's gates and stamps, the better-auth
- * adapter, the authorization resolver's `ai_seat` synthesis), which no
+ * adapter and its session user — which carries the holder's own sign-in phone
+ * number — the authorization resolver's `ai_seat` synthesis), which no
  * permission set reaches. The deactivation flag is declared OUTSIDE the group
  * on purpose (#21237): it is directory status that every user picker filters
- * on, so withholding it would refuse each member's picker query. A fresh
- * object per set, like `denyWritesOnManagedObjects()`.
+ * on, so withholding it would refuse each member's picker query. The sign-in
+ * phone number and its verified flag are declared INSIDE it on purpose: a
+ * sign-in identifier is not directory data, and a user picker's `$search`
+ * stops scanning it for a member by the queryable-field narrowing, not by a
+ * refusal. A fresh object per set, like `denyWritesOnManagedObjects()`.
  */
 const identityAdminFieldSecurity = (
   posture: 'withhold' | 'keep',
 
@@ -34,6 +34,9 @@
 //     field-level write gate, and a mixed payload does not partially succeed;
 //   - the user picker's candidate query (the not-deactivated filter) as the
 //     member: served, deactivated peers excluded;
+//   - the user picker's `$search` as the member: a colleague's name finds the
+//     colleague, a colleague's sign-in phone number finds no row (the search
+//     set is narrowed, not refused), with the admin's search as the control;
 //   - the ORG OWNER and a PLATFORM ADMIN (who holds no org-admin grant): the
 //     full group on both doors, and the platform admin's write unchanged.
 //
@@ -63,7 +66,13 @@ const SYNTHETIC: Record<string, unknown> = {
   last_login_ip: 'SYNTHETIC-ADDRESS-ONE',
   failed_login_count: 2,
   ban_reason: 'SYNTHETICREASON21237',
+  // The better-auth sign-in identifier, declared in the group: a synthetic
+  // number in the reserved fictional 555-01xx range.
+  phone_number: '+12025550137',
+  phone_number_verified: true,
 };
+/** The sign-in phone fields — account administration data, not directory data. */
+const SIGN_IN_PHONE = ['phone_number', 'phone_number_verified'];
 const SYNTHETIC_NEXT: Record<string, unknown> = { last_login_ip: 'SYNTHETIC-ADDRESS-TWO', failed_login_count: 3 };
 
 /** Object-level activity read, granted to the member for the activity door. */
@@ -225,6 +234,53 @@ describe('[#21237] the identity object Admin group at the HTTP door: org peers a
     expect(servedGroup(row!)).toEqual([]);
   });
 
+  it('a member directory read projecting the sign-in phone is served the colleague name and email without it', async () => {
+    const res = await stack.apiAs(token.member, 'GET', '/data/sys_user?fields=id,name,email,phone_number,phone_number_verified&$top=100');
+    expect(res.status).toBe(200);
+    const row = rowsOf(await res.json()).find((r) => String(r.id) === uid.colleague);
+    expect(row, 'colleague listed').toBeTruthy();
+    expect(row).toHaveProperty('name');
+    expect(row).toHaveProperty('email');
+    for (const field of SIGN_IN_PHONE) expect(row, field).not.toHaveProperty(field);
+  });
+
+  // The user picker's `$search`: `phone_number` is `searchable: true`, so it is
+  // in the object's default search set. For a member the set is NARROWED to the
+  // fields the member may query (the queryable-field narrowing), never refused:
+  // the picker keeps answering on the name, and the colleague's number answers
+  // with no row. The admin search for the same number is the control that the
+  // term really matches the stored value when the column is scanned.
+  const searchIds = async (who: string, term: string) => {
+    const res = await stack.apiAs(token[who], 'GET', `/data/sys_user?$search=${encodeURIComponent(term)}&$top=100`);
+    return { status: res.status, ids: rowsOf(await res.json()).map((r) => String(r.id)) };
+  };
+  const COLLEAGUE_NAME = 'Org Peer colleague';
+  const COLLEAGUE_PHONE_DIGITS = String(SYNTHETIC.phone_number).replace(/^\+/, '');
+
+  it('a member user-picker search by a colleague name is served the colleague', async () => {
+    const { status, ids } = await searchIds('member', COLLEAGUE_NAME);
+    expect(status).toBe(200);
+    expect(ids).toContain(uid.colleague);
+  });
+
+  it('a member search by a colleague sign-in phone number is answered with no row, not refused', async () => {
+    const { status, ids } = await searchIds('member', COLLEAGUE_PHONE_DIGITS);
+    expect(status).toBe(200);
+    expect(ids).toEqual([]);
+  });
+
+  it('the platform admin search by the same phone number is served the colleague (the control for the empty answer above)', async () => {
+    const { status, ids } = await searchIds('admin', COLLEAGUE_PHONE_DIGITS);
+    expect(status).toBe(200);
+    expect(ids).toContain(uid.colleague);
+  });
+
+  it.each(['owner', 'admin'])('the %s reads the colleague sign-in phone fields as stored', async (who) => {
+    const { status, row } = await readRow(who, 'colleague');
+    expect(status).toBe(200);
+    for (const field of SIGN_IN_PHONE) expect(row[field], field).toEqual(SYNTHETIC[field]);
+  });
+
   it('through the activity door the member is served the colleague rows with no group key in any recorded change', async () => {
     const { status, rows } = await activityRows('member', 'colleague');
     expect(status).toBe(200);