@@ -0,0 +1,14 @@
+---
+'@objectstack/metadata-protocol': patch
+---
+
+fix(metadata-protocol): a package rollback carries every item a revert step refused, and answers `success: false`
+
+Clause-②: no
+Metadata-protocol: none
+
+`rollbackToPackageCommit` (`POST /packages/:id/rollback`) reverts each newer `apply` commit with `revertCommit`. A step that refuses an item — for example a restore of a row stored under a non-canonical type (`STORED_TYPE_NOT_CANONICAL`) — reports it in the step's own returned `failed[]` and does not throw. The rollback read only a thrown error, so it answered `success: true` with an empty `failed[]` for a package left half rolled back.
+
+Each refused item now lands in the rollback's `failed[]` as `{ commitId, error }`: the commit it belongs to, and an `error` that names the item (`Item 'TYPE/NAME' was not reverted: ...`) and quotes the step's client-facing refusal text. `success` is false whenever `failed[]` is non-empty, which is what the declared answer (`RollbackToPackageCommitResponseSchema`) already says: "True exactly when nothing failed". The answer's shape is unchanged.
+
+Nothing else moves. A refused item stops neither its commit nor the rollback: the other items of that commit are still reverted, its revert commit is still recorded, and the commit is still listed in `revertedCommits`. A step that throws still lands as one `failed[]` entry for its commit, and the rollback goes on to the next commit, as before.
@@ -0,0 +1,283 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+//
+// `rollbackToPackageCommit` carries every item a `revertCommit` step refused
+// into its own `failed[]`, and answers `success: false` for it.
+//
+// A package rollback is a loop of `revertCommit` calls, newest commit first.
+// `revertCommit` reports an item it refuses — here the restore of a row stored
+// under a non-canonical type, `STORED_TYPE_NOT_CANONICAL` — in its RETURNED
+// per-item `failed[]`; it does not throw. The rollback read only a thrown
+// error, so it dropped the returned refusals and answered `success: true` for
+// a package left half rolled back, naming nothing it had left in place.
+//
+// The declared answer (`RollbackToPackageCommitResponseSchema`) says
+// `success` is "True exactly when nothing failed", and each `failed[]` entry
+// is `{ commitId, error }`. A refused item therefore lands as one entry: the
+// commit it belongs to, and an `error` that names the item (`type/name`) and
+// quotes `revertCommit`'s client-facing refusal text.
+//
+// Driven over the real `SysMetadataRepository`, with the commit ledger served
+// by the engine double so `listCommits` plans the rollback itself.
+
+import { afterEach, describe, expect, it, vi } from 'vitest';
+// [#5619] The producer's OWN write-verb dispatch decisions, from
+// `@objectstack/metadata-core` — objectql depends on this package.
+import { assertEngineDeleteDispatch, assertEngineUpdateDispatch, assertEngineFindOnePredicate } from '@objectstack/metadata-core';
+import { ObjectStackProtocolImplementation } from './protocol.js';
+
+interface Row {
+    id: string;
+    type: string;
+    name: string;
+    organization_id: string | null;
+    package_id: string | null;
+    state: string;
+    metadata: string;
+}
+
+interface HistoryRow {
+    id: string;
+    type: string;
+    name: string;
+    version: number;
+    organization_id: string | null;
+    operation_type: string;
+}
+
+const PKG = 'app.demo';
+
+/** ADR-0048 overlay key — (type, name, org, state, package_id). */
+const keyOf = (w: Record<string, unknown>) =>
+    `${w.type}|${w.name}|${w.organization_id ?? '__env__'}|${w.state ?? 'active'}|${w.package_id ?? '__nopkg__'}`;
+
+function matchesWhere(r: Record<string, unknown>, where: Record<string, unknown>): boolean {
+    for (const [k, v] of Object.entries(where)) {
+        if (k === '$or') {
+            if (!(v as Array<Record<string, unknown>>).some((c) => matchesWhere(r, c))) return false;
+            continue;
+        }
+        if (k.startsWith('$')) throw new Error(`test double: unsupported combinator '${k}'`);
+        if (v === undefined) continue;
+        if ((r[k] ?? null) !== v) return false;
+    }
+    return true;
+}
+
+/** One `apply` commit row in the driver's snake_case wire shape. */
+const applyCommit = (id: string, createdAt: string, items: unknown[]) => ({
+    id,
+    package_id: PKG,
+    organization_id: null,
+    operation: 'apply',
+    message: `commit ${id}`,
+    item_count: items.length,
+    created_at: createdAt,
+    items: JSON.stringify(items),
+});
+
+function makeProtocol(opts: { unreadableCommits?: readonly string[] } = {}) {
+    const rows = new Map<string, Row>();
+    const historyRows: HistoryRow[] = [];
+    const commits: Array<Record<string, unknown>> = [];
+    const unreadable = new Set(opts.unreadableCommits ?? []);
+    let nextId = 0;
+
+    const findRow = (w: Record<string, unknown>): { key: string; row: Row } | null => {
+        if (w.id !== undefined) {
+            for (const [k, r] of rows) if (r.id === w.id) return { key: k, row: r };
+            return null;
+        }
+        for (const [k, r] of rows) if (matchesWhere(r as any, w)) return { key: k, row: r };
+        return null;
+    };
+    const matchesHistory = (h: HistoryRow, w: Record<string, unknown>): boolean =>
+        (['organization_id', 'type', 'name', 'version', 'operation_type'] as const)
+            .every((k) => w[k] === undefined || h[k] === w[k]);
+
+    const engine: any = {
+        async findOne(table: string, o: { where: Record<string, unknown> }) {
+            assertEngineFindOnePredicate(table, o);
+            if (table === 'sys_metadata_commit') {
+                // A commit the ledger LISTS but whose own read answers nothing —
+                // the inner `revertCommit` then throws `COMMIT_NOT_FOUND`.
+                if (unreadable.has(String(o.where.id))) return null;
+                return commits.find((c) => c.id === o.where.id) ?? null;
+            }
+            if (table === 'sys_metadata_history') {
+                return historyRows.find((h) => matchesHistory(h, o.where)) ?? null;
+            }
+            if (table !== 'sys_metadata') return null;
+            return findRow(o.where)?.row ?? null;
+        },
+        async find(table: string, o?: { where?: Record<string, unknown>; limit?: number }) {
+            const matched: unknown[] =
+                table === 'sys_metadata_commit'
+                    ? commits.filter((c) => c.package_id === o?.where?.package_id)
+                    : table === 'sys_metadata_history'
+                        ? historyRows.filter((h) => matchesHistory(h, o?.where ?? {}))
+                        : table === 'sys_metadata'
+                            ? Array.from(rows.values()).filter((r) => matchesWhere(r as any, o?.where ?? {}))
+                            : [];
+            return typeof o?.limit === 'number' ? matched.slice(0, o.limit) : matched;
+        },
+        async insert(table: string, data: Record<string, unknown>) {
+            nextId += 1;
+            if (table === 'sys_metadata_commit') {
+                commits.push({ ...data });
+                return { id: String(data.id ?? `cm_${nextId}`) };
+            }
+            if (table === 'sys_metadata_history') {
+                const h = { ...(data as unknown as HistoryRow), id: `h_${nextId}` };
+                historyRows.push(h);
+                return { id: h.id };
+            }
+            if (table !== 'sys_metadata') return { id: 'side_effect_skip' };
+            const row = { ...(data as unknown as Row), id: `r_${nextId}` };
+            rows.set(keyOf(data), row);
+            return { id: row.id };
+        },
+        async update(_t: string, data: Record<string, unknown>, o: { where: Record<string, unknown> }) {
+            assertEngineUpdateDispatch(data, o);
+            const found = findRow(o.where);
+            if (!found) return { id: null };
+            const merged = { ...found.row, ...(data as unknown as Row) };
+            rows.delete(found.key);
+            rows.set(keyOf(merged), merged);
+            return { id: found.row.id };
+        },
+        async delete(_t: string, o: { where: Record<string, unknown> }) {
+            assertEngineDeleteDispatch(o);
+            const found = findRow(o.where);
+            if (!found) return { deleted: 0 };
+            rows.delete(found.key);
+            return { deleted: 1 };
+        },
+        async transaction<T>(cb: (ctx: unknown, info: { owned: boolean }) => Promise<T>): Promise<T> {
+            return cb(undefined, { owned: true });
+        },
+        async syncObjectSchema() { return true; },
+        async dropObjectSchema() { return true; },
+        registry: {
+            registerItem: () => undefined,
+            registerObject: () => undefined,
+            listItems: () => [],
+            getItem: () => undefined,
+            getObject: () => undefined,
+            getPackage: () => undefined,
+            getArtifactItem: () => undefined,
+            removeRuntimeShadow: () => false,
+            removeOverlayEntry: () => undefined,
+        },
+    };
+    const protocol = new ObjectStackProtocolImplementation(engine, () => new Map(), undefined) as any;
+    return { protocol, rows, commits };
+}
+
+/** Write a row through the repository, which stores `type` exactly as given. */
+async function seed(protocol: any, type: string, name: string, label: string): Promise<void> {
+    await protocol.ensureOverlayIndex();
+    const repo = protocol.getOverlayRepo(null);
+    const ref = { type, name, org: 'env' };
+    const existing = await repo.get(ref, { state: 'active' });
+    await repo.put(ref, { name, label }, {
+        parentVersion: existing?.hash ?? null,
+        actor: null,
+        source: 'test.rollback-item-failures',
+        intent: 'runtime-only',
+        state: 'active',
+    });
+}
+
+const stored = (rows: Map<string, Row>, type: string, name: string): any => {
+    for (const r of rows.values()) if (r.type === type && r.name === name) return JSON.parse(r.metadata);
+    return undefined;
+};
+
+/**
+ * The package's history: target `c0`; `c1` created `view/created_in_c1`;
+ * `c2` created `view/created_in_c2`, edited `view/grid` (V1 → V2) and edited
+ * `fields/a.b` (V1 → V2). The `fields` row is stored under the non-canonical
+ * type, so `revertCommit` refuses to restore it (`STORED_TYPE_NOT_CANONICAL`).
+ */
+async function seedPackage(protocol: any, commits: Array<Record<string, unknown>>, opts: { refusedItem: boolean }) {
+    await seed(protocol, 'view', 'grid', 'V1');
+    await seed(protocol, 'view', 'grid', 'V2');
+    await seed(protocol, 'view', 'created_in_c1', 'C1');
+    await seed(protocol, 'view', 'created_in_c2', 'C2');
+    if (opts.refusedItem) {
+        await seed(protocol, 'fields', 'a.b', 'V1');
+        await seed(protocol, 'fields', 'a.b', 'V2');
+    }
+    commits.push(
+        applyCommit('c0', '2026-01-01T00:00:00Z', []),
+        applyCommit('c1', '2026-01-02T00:00:00Z', [
+            { type: 'view', name: 'created_in_c1', existedBefore: false, prevVersion: null },
+        ]),
+        applyCommit('c2', '2026-01-03T00:00:00Z', [
+            { type: 'view', name: 'grid', existedBefore: true, prevVersion: 1 },
+            ...(opts.refusedItem ? [{ type: 'fields', name: 'a.b', existedBefore: true, prevVersion: 1 }] : []),
+            { type: 'view', name: 'created_in_c2', existedBefore: false, prevVersion: null },
+        ]),
+    );
+}
+
+afterEach(() => {
+    vi.restoreAllMocks();
+});
+
+describe('rollbackToPackageCommit carries the items a revert step refused', () => {
+    it('answers `success: false` and names the commit, the item and the refusal text', async () => {
+        vi.spyOn(console, 'warn').mockImplementation(() => undefined);
+        const { protocol, rows, commits } = makeProtocol();
+        await seedPackage(protocol, commits, { refusedItem: true });
+
+        // What the inner step itself reports for the refused item — the text
+        // the rollback must carry.
+        const refusal = 'is stored under the non-canonical metadata type \'fields\'';
+
+        const res = await protocol.rollbackToPackageCommit({ commitId: 'c0' });
+
+        expect(res.success).toBe(false);
+        expect(res.failed).toHaveLength(1);
+        expect(Object.keys(res.failed[0]).sort()).toEqual(['commitId', 'error']);
+        expect(res.failed[0].commitId).toBe('c2');
+        expect(res.failed[0].error).toContain('fields/a.b');
+        expect(res.failed[0].error).toContain(refusal);
+        expect(res.failed[0].error).toContain('PUT /meta/field/a.b');
+
+        // Everything else is rolled back as before: both commits are reverted
+        // (each step records its own revert commit) and the neighbours of the
+        // refused item are undone.
+        expect([...res.revertedCommits].sort()).toEqual(['c1', 'c2']);
+        expect(stored(rows, 'view', 'created_in_c1')).toBeUndefined();
+        expect(stored(rows, 'view', 'created_in_c2')).toBeUndefined();
+        expect(stored(rows, 'view', 'grid')?.label).toBe('V1');
+        // The refused item stayed as it was.
+        expect(stored(rows, 'fields', 'a.b')?.label).toBe('V2');
+    });
+
+    it('control: an all-clean rollback answers `success: true` with an empty `failed[]`', async () => {
+        const { protocol, rows, commits } = makeProtocol();
+        await seedPackage(protocol, commits, { refusedItem: false });
+
+        const res = await protocol.rollbackToPackageCommit({ commitId: 'c0' });
+
+        expect(res).toEqual({ success: true, revertedCommits: expect.any(Array), failed: [] });
+        expect([...res.revertedCommits].sort()).toEqual(['c1', 'c2']);
+        expect(stored(rows, 'view', 'grid')?.label).toBe('V1');
+    });
+
+    it('control: a commit whose revert throws still lands in `failed[]`, and the next commit is still reverted', async () => {
+        vi.spyOn(console, 'warn').mockImplementation(() => undefined);
+        const { protocol, rows, commits } = makeProtocol({ unreadableCommits: ['c2'] });
+        await seedPackage(protocol, commits, { refusedItem: false });
+
+        const res = await protocol.rollbackToPackageCommit({ commitId: 'c0' });
+
+        expect(res.success).toBe(false);
+        expect(res.failed).toEqual([{ commitId: 'c2', error: "No commit 'c2'." }]);
+        expect(res.revertedCommits).toEqual(['c1']);
+        expect(stored(rows, 'view', 'created_in_c1')).toBeUndefined();
+        expect(stored(rows, 'view', 'grid')?.label).toBe('V2');
+    });
+});
@@ -27156,6 +27156,15 @@ export class ObjectStackProtocolImplementation implements
      * Roll a package back THROUGH every `apply` commit newer than `commitId`
      * (newest first), leaving the package as it was at that commit. Each step is
      * an individual `revertCommit`, so the whole rollback is itself audited.
+     *
+     * `failed[]` carries both kinds of failure a step can have: a step that
+     * THREW (one entry for the commit), and every item a step REFUSED and
+     * reported in its own returned `failed[]` (one entry per item, its `error`
+     * naming the item and quoting the step's client-facing text). Either makes
+     * `success` false — the declared answer's "true exactly when nothing
+     * failed". A refused item stops neither its commit nor the rollback: the
+     * step still reverts the item's neighbours and records its revert commit,
+     * so that commit is also listed in `revertedCommits`.
      */
     async rollbackToPackageCommit(request: {
         commitId: string;
@@ -27192,11 +27201,19 @@ export class ObjectStackProtocolImplementation implements
         const failed: Array<{ commitId: string; error: string }> = [];
         for (const c of toRevert) {
             try {
-                await this.revertCommit({
+                const step = await this.revertCommit({
                     commitId: c.id,
                     ...(request.actor ? { actor: request.actor } : {}),
                 });
                 revertedCommits.push(c.id);
+                // An item the step refused is returned, never thrown; its
+                // `error` is already client-facing (P11).
+                for (const item of step.failed) {
+                    failed.push({
+                        commitId: c.id,
+                        error: `Item '${item.type}/${item.name}' was not reverted: ${item.error}`,
+                    });
+                }
             } catch (e: any) {
                 // [#8333 · P12] The derivative of P11 — `failed[].error` on the
                 // rollback response. Measured on `origin/main` by failing the
 
@@ -1626,6 +1626,21 @@
       "verb": "update",
       "pinned": 1
     },
+    {
+      "file": "packages/metadata-protocol/src/protocol.rollback-carries-item-failures.test.ts",
+      "verb": "delete",
+      "pinned": 1
+    },
+    {
+      "file": "packages/metadata-protocol/src/protocol.rollback-carries-item-failures.test.ts",
+      "verb": "findOne",
+      "pinned": 1
+    },
+    {
+      "file": "packages/metadata-protocol/src/protocol.rollback-carries-item-failures.test.ts",
+      "verb": "update",
+      "pinned": 1
+    },
     {
       "file": "packages/metadata-protocol/src/protocol.runtime-authoring-gate.test.ts",
       "verb": "delete",