@@ -0,0 +1,5 @@
+---
+'@objectstack/metadata-protocol': patch
+---
+
+Withdrawing or publishing a public form on a walled tenancy posture (degraded or not) is now refused loudly at authoring, with `403 NOT_OVERRIDABLE`, when the save is organization-scoped and the anonymous form doors cannot honour it. The message names the remedy: save the change env-wide, which every anonymous door honours. Drafts and draft promotion are refused alike. Other organization-scoped edits, env-wide saves and single-posture deployments are unchanged.
@@ -0,0 +1,37 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * Which public-form slugs a `view` body opens to anonymous intake.
+ *
+ * The anonymous form doors (`GET /forms/:slug`, `POST /forms/:slug/submit`,
+ * `registerFormEndpoints` in `@objectstack/rest`) serve a form when one of a
+ * view's form candidates carries `sharing.allowAnonymous === true` and a
+ * `sharing.publicLink` that names the slug. The candidates are the same three
+ * shapes those doors scan: the nested `form`, every `formViews` entry, and the
+ * flattened `config` of a `viewKind: 'form'` item.
+ *
+ * Returns the sorted, de-duplicated slug set, normalised the way the doors
+ * compare it (`/forms/x`, `forms/x` and `x` are one slug). Two bodies with the
+ * same set open exactly the same anonymous doors.
+ */
+export function anonymousFormIntakeSlugs(view: unknown): string[] {
+    if (!view || typeof view !== 'object') return [];
+    const v = view as Record<string, any>;
+    const sharings: unknown[] = [];
+    if (v.form && typeof v.form === 'object') sharings.push(v.form.sharing);
+    if (v.formViews && typeof v.formViews === 'object') {
+        for (const fv of Object.values(v.formViews)) {
+            if (fv && typeof fv === 'object') sharings.push((fv as any).sharing);
+        }
+    }
+    if (v.viewKind === 'form' && v.config && typeof v.config === 'object') sharings.push(v.config.sharing);
+    const slugs = new Set<string>();
+    for (const s of sharings) {
+        if (!s || typeof s !== 'object') continue;
+        const sharing = s as Record<string, unknown>;
+        if (sharing.allowAnonymous !== true) continue;
+        if (typeof sharing.publicLink !== 'string' || !sharing.publicLink) continue;
+        slugs.add(sharing.publicLink.replace(/^\/+/, '').replace(/^forms\//, ''));
+    }
+    return [...slugs].sort();
+}
@@ -561,3 +561,114 @@ describe('#6190 — org-scoped writes of non-org-overridable types are refused',
         expect(affected).toHaveLength(17);
     });
 });
+
+/**
+ * An org-scoped change to which public forms accept anonymous intake is
+ * refused when the anonymous form doors would never read that organization:
+ * they resolve the form in `tenancy.defaultOrgId()`'s organization, which a
+ * walled posture (degraded or not) answers `null`. Same stub engine as above;
+ * the `tenancy` service is the only addition.
+ */
+describe('org-scoped anonymous form intake changes the anonymous doors cannot see', () => {
+    const sharing = (allowAnonymous: boolean) => ({ enabled: true, allowAnonymous, publicLink: '/forms/walled-intake' });
+    const FORM_VIEW = (allowAnonymous: boolean, label = 'Intake') => ({
+        name: 'task.intake_form',
+        label,
+        object: 'task',
+        viewKind: 'form',
+        config: { sharing: sharing(allowAnonymous) },
+    });
+
+    /** `defaultOrgId` answers what the anonymous doors resolve. */
+    function makeTenancyProtocol(defaultOrgId: string | null) {
+        const { engine, rows } = makeStubEngine();
+        const services = new Map<string, unknown>([['tenancy', { defaultOrgId: async () => defaultOrgId }]]);
+        const protocol = new ObjectStackProtocolImplementation(engine, () => services, 'env_prod') as any;
+        return { protocol, rows };
+    }
+
+    async function publishEnvWide(protocol: any) {
+        const res = await protocol.saveMetaItem({ type: 'view', name: 'task.intake_form', item: FORM_VIEW(true) });
+        expect(res.success).toBe(true);
+    }
+
+    it('walled (no organization for an anonymous request): the org-scoped withdrawal is refused and nothing is saved', async () => {
+        const { protocol, rows } = makeTenancyProtocol(null);
+        await publishEnvWide(protocol);
+
+        const refusal = protocol.saveMetaItem({
+            type: 'view', name: 'task.intake_form', item: FORM_VIEW(false), organizationId: 'org_a',
+        });
+        await expect(refusal).rejects.toMatchObject({ code: 'NOT_OVERRIDABLE', status: 403, organizationId: 'org_a' });
+        await expect(refusal).rejects.toThrow(/Save it env-wide instead/);
+        expect(orgRows(rows).filter((r) => r.org === 'org_a')).toEqual([]);
+    });
+
+    it('walled: an org-scoped draft of the withdrawal is refused too', async () => {
+        const { protocol, rows } = makeTenancyProtocol(null);
+        await publishEnvWide(protocol);
+
+        await expect(protocol.saveMetaItem({
+            type: 'view', name: 'task.intake_form', item: FORM_VIEW(false), organizationId: 'org_a', mode: 'draft',
+        })).rejects.toMatchObject({ code: 'NOT_OVERRIDABLE', status: 403 });
+        expect(orgRows(rows).filter((r) => r.org === 'org_a')).toEqual([]);
+    });
+
+    it('walled: an org-scoped publish of a form the env-wide definition keeps private is refused', async () => {
+        const { protocol } = makeTenancyProtocol(null);
+        const res = await protocol.saveMetaItem({ type: 'view', name: 'task.intake_form', item: FORM_VIEW(false) });
+        expect(res.success).toBe(true);
+
+        await expect(protocol.saveMetaItem({
+            type: 'view', name: 'task.intake_form', item: FORM_VIEW(true), organizationId: 'org_a',
+        })).rejects.toMatchObject({ code: 'NOT_OVERRIDABLE', status: 403 });
+    });
+
+    it('walled: a legacy org-scoped draft of the withdrawal cannot be promoted', async () => {
+        const { protocol, rows } = makeTenancyProtocol(null);
+        await publishEnvWide(protocol);
+        await seedLegacyOrgDraft(protocol, {
+            type: 'view', name: 'task.intake_form', body: FORM_VIEW(false), organizationId: 'org_a',
+        });
+
+        await expect(
+            protocol.publishMetaItem({ type: 'view', name: 'task.intake_form', organizationId: 'org_a' }),
+        ).rejects.toMatchObject({ code: 'NOT_OVERRIDABLE', status: 403 });
+        expect(orgRows(rows).filter((r) => r.org === 'org_a' && r.state === 'active')).toEqual([]);
+    });
+
+    it('control (walled): an org-scoped edit that leaves the anonymous intake alone still saves', async () => {
+        const { protocol, rows } = makeTenancyProtocol(null);
+        await publishEnvWide(protocol);
+
+        const res = await protocol.saveMetaItem({
+            type: 'view', name: 'task.intake_form', item: FORM_VIEW(true, 'Intake (tenant)'), organizationId: 'org_a',
+        });
+        expect(res.success).toBe(true);
+        expect(orgRows(rows).filter((r) => r.org === 'org_a')).toEqual([
+            { type: 'view', name: 'task.intake_form', org: 'org_a', state: 'active' },
+        ]);
+    });
+
+    it('control (walled): the env-wide withdrawal is accepted', async () => {
+        const { protocol } = makeTenancyProtocol(null);
+        await publishEnvWide(protocol);
+
+        const res = await protocol.saveMetaItem({ type: 'view', name: 'task.intake_form', item: FORM_VIEW(false) });
+        expect(res.success).toBe(true);
+        expect(res.message).toContain('env-wide');
+    });
+
+    it('control (single): the doors resolve this organization, so the org-scoped withdrawal is accepted', async () => {
+        const { protocol, rows } = makeTenancyProtocol('org_a');
+        await publishEnvWide(protocol);
+
+        const res = await protocol.saveMetaItem({
+            type: 'view', name: 'task.intake_form', item: FORM_VIEW(false), organizationId: 'org_a',
+        });
+        expect(res.success).toBe(true);
+        expect(orgRows(rows).filter((r) => r.org === 'org_a')).toEqual([
+            { type: 'view', name: 'task.intake_form', org: 'org_a', state: 'active' },
+        ]);
+    });
+});
@@ -38,6 +38,7 @@ import {
 // [#7560] ADR-0070's read-only-package rule, shared with the `/packages`
 // lifecycle gate in `@objectstack/runtime` — see `./package-writability.js`.
 import { isWritablePackage as isWritablePackageShared } from './package-writability.js';
+import { anonymousFormIntakeSlugs } from './anonymous-form-intake.js';
 import type { RuntimeAuthoringIssue } from './runtime-authoring-gate.js';
 // [#6418] `sys_metadata`'s overlay-uniqueness indexes: probe-first DDL plus the
 // ADR-0120 D4 reporting that replaced this file's empty `catch` blocks.
@@ -14946,6 +14947,66 @@ export class ObjectStackProtocolImplementation implements
         return err;
     }
 
+    /**
+     * An organization-scoped `view` write that changes which public forms
+     * accept anonymous intake, on a deployment whose anonymous form doors do
+     * not read that organization. Returns the refusal, or `null` when the
+     * write is fine.
+     *
+     * An anonymous form request carries no session and so no organization.
+     * The doors resolve the form in `tenancy.defaultOrgId()`'s organization
+     * (`registerFormEndpoints` in `@objectstack/rest`). Where that is not the
+     * write's organization (every walled posture, degraded or not, answers
+     * `null`), the doors read the env-wide definition, so the write is refused
+     * and the author is pointed at the env-wide save, which every door
+     * honours. A composition with no tenancy service has no posture to judge
+     * (and no session to carry an organization over HTTP), so it is left as is.
+     *
+     * Judged on the anonymous slug set alone ({@link anonymousFormIntakeSlugs}):
+     * an organization-scoped edit that leaves it as the env-wide definition has
+     * it is unaffected. Same code and status as {@link orgScopedWriteRefusal}:
+     * this item's anonymous intake has no per-org channel on this deployment.
+     */
+    private async anonymousFormIntakeOrgScopeRefusal(args: {
+        type: string;
+        name: string;
+        organizationId: string | null | undefined;
+        body: unknown;
+    }): Promise<Error | null> {
+        if (!args.organizationId) return null;
+        const singular = PLURAL_TO_SINGULAR[args.type] ?? args.type;
+        if (singular !== 'view') return null;
+        const tenancy = this.getServicesRegistry?.().get('tenancy') as
+            | { defaultOrgId?: () => Promise<string | null> }
+            | undefined;
+        if (typeof tenancy?.defaultOrgId !== 'function') return null;
+        const doorOrganization = await tenancy.defaultOrgId();
+        if (doorOrganization === args.organizationId) return null;
+        const proposed = anonymousFormIntakeSlugs(args.body);
+        const served = anonymousFormIntakeSlugs(
+            ((await this.getMetaItem({ type: singular, name: args.name })) as any)?.item,
+        );
+        if (proposed.length === served.length && proposed.every((s, i) => s === served[i])) return null;
+        const list = (slugs: string[]) => (slugs.length ? slugs.map((s) => `'${s}'`).join(', ') : 'none');
+        const err: any = new Error(
+            `Metadata item 'view/${args.name}' cannot change which public forms accept anonymous intake `
+            + `in organization '${args.organizationId}' (env-wide: ${list(served)}; this write: ${list(proposed)}). `
+            + `An anonymous form request carries no organization, and this deployment resolves `
+            + (doorOrganization
+                ? `it in organization '${doorOrganization}'`
+                : `none for it (a walled tenancy posture never guesses one)`)
+            + `, so the anonymous form doors serve the env-wide definition and would never see this change. `
+            + `Save it env-wide instead (retry with no active organization): that withdraws or publishes the form `
+            + `on every anonymous door. An organization-scoped edit that leaves the form's sharing as the env-wide `
+            + `definition has it is still accepted. See docs/adr/0005-metadata-customization-overlay.md.`
+        );
+        err.code = 'NOT_OVERRIDABLE';
+        err.status = 403;
+        err.organizationId = args.organizationId;
+        err.docs = 'docs/adr/0005-metadata-customization-overlay.md';
+        return err;
+    }
+
     /**
      * Does an artifact (npm-package-loaded) item exist at `(type, name)`?
      *
@@ -17722,6 +17783,18 @@ export class ObjectStackProtocolImplementation implements
             );
             if (orgRefusal) throw orgRefusal;
         }
+        // An org-scoped change to a form's anonymous intake that the anonymous
+        // form doors cannot see. Drafts too, so no draft is minted that its
+        // own promotion would refuse. See {@link anonymousFormIntakeOrgScopeRefusal}.
+        {
+            const intakeRefusal = await this.anonymousFormIntakeOrgScopeRefusal({
+                type: request.type,
+                name: request.name,
+                organizationId: request.organizationId,
+                body: request.item,
+            });
+            if (intakeRefusal) throw intakeRefusal;
+        }
 
         if (this.environmentId !== undefined) {
             // [#8184] THE PACKAGE DOOR — the refusal of a write onto an item a
@@ -19675,6 +19748,17 @@ export class ObjectStackProtocolImplementation implements
             const nameRefusal = savedItemNameRefusal(singularType, draftForGate.body, request.name, 'publish');
             if (nameRefusal) throw nameRefusal;
         }
+        // The promotion half of {@link anonymousFormIntakeOrgScopeRefusal}: a
+        // draft saved before that refusal existed must not reach `active`.
+        if (draftForGate) {
+            const intakeRefusal = await this.anonymousFormIntakeOrgScopeRefusal({
+                type: singularType,
+                name: request.name,
+                organizationId: orgId,
+                body: draftForGate.body,
+            });
+            if (intakeRefusal) throw intakeRefusal;
+        }
         // [#9176] The gate's return is its advisory half (#4717): captured and
         // handed out so `publishMetaItem` can attach it to the 2xx this
         // promotion is about to earn, exactly as `saveMetaItem` attaches its
-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +'@objectstack/metadata-protocol': patch
 +---
++
 +Withdrawing or publishing a public form on a walled tenancy posture (degraded or not) is now refused loudly at authoring, with `403 NOT_OVERRIDABLE`, when the save is organization-scoped and the anonymous form doors cannot honour it. The message names the remedy: save the change env-wide, which every anonymous door honours. Drafts and draft promotion are refused alike. Other organization-scoped edits, env-wide saves and single-posture deployments are unchanged.