@@ -0,0 +1,19 @@
+---
+'@objectstack/plugin-security': minor
+'@objectstack/objectql': patch
+'@objectstack/spec': patch
+---
+
+feat(plugin-security): a declared membership key is staged per request, so a policy reading `current_user.KEY` reads the roster
+
+Clause-②: no
+Metadata-protocol: semantic
+
+`ObjectSchema.membershipKeys` is now applied. The security plugin's request staging (`stageRlsMembership`, the one producer of `ExecutionContext.rlsMembership`) gains the declarative second source beside the registered `rls-membership-resolver`: when a row policy about to compile reads `current_user.KEY` and an object declares `KEY`, the key is resolved from that roster object's rows.
+
+- **What the key holds.** The distinct values of `valueField` on the roster rows whose `userField` is the signed-in user and on which the optional `filter` holds, inside the caller's own organization wall.
+- **How it is read.** Lazily and once per request: only a key a policy about to compile reads is resolved, on the read door and the write `check` alike, and one request that reads the key on several objects issues one read. The read is the platform's own system read: the caller needs no read on the roster object, and the caller's posture and audience do not change it (a portal contact and an internal member resolve a key the same way). The roster object's own row policies are not consulted.
+- **Every miss fails closed.** No roster row stages an empty set. More than 1,000 values (`MEMBERSHIP_KEY_MAX_VALUES`), a failed read, a `filter` that does not compile for the roster object (a shape that does not lower, a column the object lacks, any `current_user.*`), a key two objects declare, and a key the registered resolver also owns leave the key unresolved. Every policy reading such a key matches no rows, through the compiler's existing warning. A key both sources claim is logged as an error at boot, naming both owners, and again by the request that meets it.
+- **Explain.** The object-level `rls` layer names each key the policies read: its label and description, the roster object, `valueField`, `userField`, the filter, and the size it resolved to or why it did not, and the permission sets whose holders can write the roster object (whoever can write a roster row can grant the key). A record-grained rule reads `via: 'membership:KEY'`, and its detail names the roster row that links the record to the principal.
+- **`@objectstack/objectql`: an `extend` contribution cannot declare a membership key.** `SchemaRegistry.registerObject` refuses one that carries `membershipKeys`, with `INVALID_METADATA` (`status: 422`) and the error name `ExtensionMembershipKeysRefusedError`, naming the object and the extending package, beside the `defaultRowScope` refusal. The extension merge never carried the key onto the object, so it registered and then never resolved. The manifest path already refused it at authoring.
+- **`@objectstack/spec`**: the `membershipKeys` describe and the row-level security docs no longer say the key is not applied, and the liveness row is `live`.
@@ -971,7 +971,7 @@ Metadata query with filtering, sorting, and pagination
 | **enable** | `{ trackHistory?: boolean; searchable?: boolean; apiEnabled?: boolean; apiMethods?: Enum<'get' \| 'list' \| 'create' \| 'update' \| 'delete' \| 'bulk'>[]; … }` | optional | Enabled system features modules |
 | **sharingModel** | `Enum<'private' \| 'public_read' \| 'public_read_write' \| 'controlled_by_parent'>` | optional | Org-Wide Default record visibility (OWD) for INTERNAL users. Canonical four only (legacy aliases removed, ADR-0090 D4): private (owner-only) \| public_read (everyone reads, owner writes) \| public_read_write (everyone reads+writes) \| controlled_by_parent (derived from the master record). A CUSTOM object that omits this resolves to private at runtime (ADR-0090 D1). |
 | **defaultRowScope** | `{ name: string; label?: string; description?: string; operation: Enum<'select' \| 'insert' \| 'update' \| 'delete' \| 'all'>; … }` | optional | The object's default row scope: one row-level security policy, written like a permission set's `rowLevelSecurity` entry without `object` (the declaring object is implied; writing `object` is refused). The security plugin's row-policy collection, the one step every read, write and explain passes through, applies it when no permission set the caller holds carries a row policy for this object and the operation: a held policy for every object (`'*'`) counts, while one for another operation, switched off, or outside the caller's positions does not. A policy an authored set carries for the object is used as authored, with this default not added to it; a principal whose superuser bypass skips row policies is unaffected; an object that declares none keeps the behaviour it has without the key. The default is judged like a held policy: its `operation`, `positions` and `enabled` decide where it applies, and a `using` the row-filter compiler cannot lower makes every read it governs return no rows, with one warning in the server log. `os validate`, `os build` and `os lint` judge this predicate as they judge a permission set's policy and report one that cannot lower; saving the object through the server does not run that check, so keep it inside the lowerable subset. Explain names an applied default as the object's own, not a permission set's. |
-| **membershipKeys** | `Record<string, { userField: string; valueField: string; filter?: string; label?: string; … }>` | optional | Membership keys this object defines, by name: each makes `current_user.KEY` the set of `valueField` values on this object's rows whose `userField` is the signed-in user and on which the optional `filter` holds, for a row-level security policy to read with `in` (e.g. `supplier in current_user.portal_supplier_ids`, declared on a supplier-contact object as `portal_supplier_ids: { userField: 'user', valueField: 'supplier', filter: 'active == true' }`). Declare a key on the one object whose rows define it; a key name is one request-wide name, so declaring it on two objects is refused, and the kernel's own names (`id`, `organization_id`, `positions`, `org_user_ids`, `accessible_org_ids`, `email`) are refused. The contract the server is to meet once it reads the key: the set is read once per request, as a system read inside the caller's organization and regardless of what the caller may read on this object; it holds at most 1,000 values, and a larger set, a failed read or a key nothing resolves makes every policy reading it match no rows. Not applied yet: no server reads this key in this release, so a policy reading `current_user.KEY` matches no rows. Until it is applied, scope rows with positions or a registered membership resolver. |
+| **membershipKeys** | `Record<string, { userField: string; valueField: string; filter?: string; label?: string; … }>` | optional | Membership keys this object defines, by name: each makes `current_user.KEY` the set of `valueField` values on this object's rows whose `userField` is the signed-in user and on which the optional `filter` holds, for a row-level security policy to read with `in` (e.g. `supplier in current_user.portal_supplier_ids`, declared on a supplier-contact object as `portal_supplier_ids: { userField: 'user', valueField: 'supplier', filter: 'active == true' }`). Declare a key on the one object whose rows define it; a key name is one request-wide name, so declaring it on two objects is refused, and the kernel's own names (`id`, `organization_id`, `positions`, `org_user_ids`, `accessible_org_ids`, `email`) are refused. The set is read once per request, only when a policy reads the key, as a system read inside the caller's organization and regardless of what the caller may read on this object, so the caller needs no read on it; it holds at most 1,000 values, and a larger set, a failed read, a `filter` that does not compile for this object, or a key a registered membership resolver also owns makes every policy reading it match no rows. Whoever can write this object's rows can grant the key. |
 | **externalSharingModel** | `never` | optional | [REMOVED] `object.externalSharingModel` was removed in @objectstack/spec 18 (ADR-0049 enforce-or-remove) — it never had an effect: no request resolves an external principal, and the external rung of the authorization kernel (ADR-0095) admits explicitly shared rows only, never an org-wide default, so the value changed no answer for anyone. Delete the key. `sharingModel` is the one org-wide default; a principal reaches a row it does not own through an explicit share, and an anonymous reader through a share link (`publicSharing`). Run `os migrate meta --from 17` to list the mechanical edits for existing sources; `--write` applies the ones it can prove, and you apply the rest by hand. |
 | **publicSharing** | `{ enabled?: boolean; allowedAudiences?: Enum<'public' \| 'link_only' \| 'signed_in' \| 'email'>[]; allowedPermissions?: Enum<'view' \| 'comment' \| 'edit'>[]; maxExpiryDays?: integer; … }` | optional | Public share-link policy (Notion/Figma-style link sharing) |
 | **actions** | `{ name: string; label: string \| Record<string, string>; description?: string \| Record<string, string>; objectName?: string; … }[]` | optional | Actions associated with this object (auto-populated from top-level actions via objectName) |
 
@@ -174,7 +174,7 @@ const result = ApiMethod.parse(data);
 | **enable** | `{ trackHistory?: boolean; searchable?: boolean; apiEnabled?: boolean; apiMethods?: Enum<'get' \| 'list' \| 'create' \| 'update' \| 'delete' \| 'bulk'>[]; … }` | optional | Enabled system features modules |
 | **sharingModel** | `Enum<'private' \| 'public_read' \| 'public_read_write' \| 'controlled_by_parent'>` | optional | Org-Wide Default record visibility (OWD) for INTERNAL users. Canonical four only (legacy aliases removed, ADR-0090 D4): private (owner-only) \| public_read (everyone reads, owner writes) \| public_read_write (everyone reads+writes) \| controlled_by_parent (derived from the master record). A CUSTOM object that omits this resolves to private at runtime (ADR-0090 D1). |
 | **defaultRowScope** | `{ name: string; label?: string; description?: string; operation: Enum<'select' \| 'insert' \| 'update' \| 'delete' \| 'all'>; … }` | optional | The object's default row scope: one row-level security policy, written like a permission set's `rowLevelSecurity` entry without `object` (the declaring object is implied; writing `object` is refused). The security plugin's row-policy collection, the one step every read, write and explain passes through, applies it when no permission set the caller holds carries a row policy for this object and the operation: a held policy for every object (`'*'`) counts, while one for another operation, switched off, or outside the caller's positions does not. A policy an authored set carries for the object is used as authored, with this default not added to it; a principal whose superuser bypass skips row policies is unaffected; an object that declares none keeps the behaviour it has without the key. The default is judged like a held policy: its `operation`, `positions` and `enabled` decide where it applies, and a `using` the row-filter compiler cannot lower makes every read it governs return no rows, with one warning in the server log. `os validate`, `os build` and `os lint` judge this predicate as they judge a permission set's policy and report one that cannot lower; saving the object through the server does not run that check, so keep it inside the lowerable subset. Explain names an applied default as the object's own, not a permission set's. |
-| **membershipKeys** | `Record<string, { userField: string; valueField: string; filter?: string; label?: string; … }>` | optional | Membership keys this object defines, by name: each makes `current_user.KEY` the set of `valueField` values on this object's rows whose `userField` is the signed-in user and on which the optional `filter` holds, for a row-level security policy to read with `in` (e.g. `supplier in current_user.portal_supplier_ids`, declared on a supplier-contact object as `portal_supplier_ids: { userField: 'user', valueField: 'supplier', filter: 'active == true' }`). Declare a key on the one object whose rows define it; a key name is one request-wide name, so declaring it on two objects is refused, and the kernel's own names (`id`, `organization_id`, `positions`, `org_user_ids`, `accessible_org_ids`, `email`) are refused. The contract the server is to meet once it reads the key: the set is read once per request, as a system read inside the caller's organization and regardless of what the caller may read on this object; it holds at most 1,000 values, and a larger set, a failed read or a key nothing resolves makes every policy reading it match no rows. Not applied yet: no server reads this key in this release, so a policy reading `current_user.KEY` matches no rows. Until it is applied, scope rows with positions or a registered membership resolver. |
+| **membershipKeys** | `Record<string, { userField: string; valueField: string; filter?: string; label?: string; … }>` | optional | Membership keys this object defines, by name: each makes `current_user.KEY` the set of `valueField` values on this object's rows whose `userField` is the signed-in user and on which the optional `filter` holds, for a row-level security policy to read with `in` (e.g. `supplier in current_user.portal_supplier_ids`, declared on a supplier-contact object as `portal_supplier_ids: { userField: 'user', valueField: 'supplier', filter: 'active == true' }`). Declare a key on the one object whose rows define it; a key name is one request-wide name, so declaring it on two objects is refused, and the kernel's own names (`id`, `organization_id`, `positions`, `org_user_ids`, `accessible_org_ids`, `email`) are refused. The set is read once per request, only when a policy reads the key, as a system read inside the caller's organization and regardless of what the caller may read on this object, so the caller needs no read on it; it holds at most 1,000 values, and a larger set, a failed read, a `filter` that does not compile for this object, or a key a registered membership resolver also owns makes every policy reading it match no rows. Whoever can write this object's rows can grant the key. |
 | **externalSharingModel** | `never` | optional | [REMOVED] `object.externalSharingModel` was removed in @objectstack/spec 18 (ADR-0049 enforce-or-remove) — it never had an effect: no request resolves an external principal, and the external rung of the authorization kernel (ADR-0095) admits explicitly shared rows only, never an org-wide default, so the value changed no answer for anyone. Delete the key. `sharingModel` is the one org-wide default; a principal reaches a row it does not own through an explicit share, and an anonymous reader through a share link (`publicSharing`). Run `os migrate meta --from 17` to list the mechanical edits for existing sources; `--write` applies the ones it can prove, and you apply the rest by hand. |
 | **publicSharing** | `{ enabled?: boolean; allowedAudiences?: Enum<'public' \| 'link_only' \| 'signed_in' \| 'email'>[]; allowedPermissions?: Enum<'view' \| 'comment' \| 'edit'>[]; maxExpiryDays?: integer; … }` | optional | Public share-link policy (Notion/Figma-style link sharing) |
 | **actions** | `{ name: string; label: string \| Record<string, string>; description?: string \| Record<string, string>; objectName?: string; … }[]` | optional | Actions associated with this object (auto-populated from top-level actions via objectName) |
 
@@ -60,8 +60,9 @@ through one of two sources:
 - a **registered membership resolver** (ADR-0105 D11, the
   `rls-membership-resolver` service), code an installed plugin runs; or
 - a **declared membership key**: `ObjectSchema.membershipKeys` on the roster
-  object whose rows define the set. Not applied yet: the security plugin
-  does not read the declaration in this release.
+  object whose rows define the set, which the security plugin stages
+  per request beside the resolver's keys. A key both sources claim
+  resolves from neither.
 
 The platform stages no other key. A policy reading a key neither source
 supplies drops out and matches no rows (fail closed).