diff --git a/app/config/openapi.js b/app/config/openapi.js
index b2a8679..42a1412 100644
--- a/app/config/openapi.js
+++ b/app/config/openapi.js
@@ -388,6 +388,30 @@ function bulkPath(bodyKey, schemaName) {
                 201: {
                     description: 'All entries created (or a replay of a previously-cached create)',
                     headers: idempotencyReplayResponseHeader,
+                    // Controller (`_bulk-helpers.makeBulkCreate` /
+                    // `makeBulkCreateIndirect`) emits {message, count,
+                    // [bodyKey]: <created rows>}. Same envelope every
+                    // bulk endpoint uses — the convention is that the
+                    // response's array key matches the request's
+                    // bodyKey. Declaring the shape here means all 12
+                    // factory-driven bulk endpoints get the content
+                    // schema in one place, parallel to the
+                    // customer/bulk fix in #332.
+                    content: {
+                        'application/json': {
+                            schema: {
+                                type: 'object',
+                                properties: {
+                                    message: { type: 'string' },
+                                    count: { type: 'integer' },
+                                    [bodyKey]: {
+                                        type: 'array',
+                                        items: { $ref: `#/components/schemas/${schemaName}` },
+                                    },
+                                },
+                            },
+                        },
+                    },
                 },
                 400: { description: 'Validation failure (array empty/capped, missing parent FK, master without scope)' },
                 403: { description: 'Missing authKey or cross-tenant create attempt' },
diff --git a/tests/api/openapi.test.js b/tests/api/openapi.test.js
index 3841705..55833c7 100644
--- a/tests/api/openapi.test.js
+++ b/tests/api/openapi.test.js
@@ -92,6 +92,43 @@ describe('OpenAPI spec', () => {
         expect(err.required).toEqual(['message']);
     });
 
+    test('bulkPath factory declares the {message, count, [bodyKey]} envelope across all 12 factory-driven endpoints', async () => {
+        // The bulkPath() factory in app/config/openapi.js emits the
+        // schema for the 12 entities that use _bulk-helpers (worker,
+        // billingtype, inventoryitem, inventorytransaction,
+        // purchaseordervendor, job, invoice, customerpayment,
+        // invoicejob, productentry, purchaseorderheader,
+        // purchaseorderline). Customer/bulk uses a hand-rolled spec
+        // entry, fixed separately in #332. Pin the factory-side
+        // contract once so any of the 12 endpoints regressing fails
+        // CI as a group.
+        const res = await request(app).get('/openapi.json');
+        const targets = [
+            ['/v1/worker/bulk',                'workers',              'Worker'],
+            ['/v1/billingtype/bulk',           'billingTypes',         'BillingType'],
+            ['/v1/inventoryitem/bulk',         'inventoryItems',       'InventoryItem'],
+            ['/v1/inventorytransaction/bulk',  'inventoryTransactions','InventoryTransaction'],
+            ['/v1/purchaseordervendor/bulk',   'vendors',              'PurchaseOrderVendor'],
+            ['/v1/job/bulk',                   'jobs',                 'Job'],
+            ['/v1/invoice/bulk',               'invoices',             'Invoice'],
+            ['/v1/customerpayment/bulk',       'customerPayments',     'CustomerPayment'],
+            ['/v1/invoicejob/bulk',            'invoiceJobs',          'InvoiceJob'],
+            ['/v1/productentry/bulk',          'productEntries',       'ProductEntry'],
+            ['/v1/purchaseorderheader/bulk',   'purchaseOrderHeaders', 'PurchaseOrderHeader'],
+            ['/v1/purchaseorderline/bulk',     'purchaseOrderLines',   'PurchaseOrderLine'],
+        ];
+        for (const [path, bodyKey, schemaName] of targets) {
+            const r201 = res.body.paths[path].post.responses['201'];
+            const schema = r201.content['application/json'].schema;
+            expect(schema.type, `${path} 201 should declare object`).toBe('object');
+            expect(schema.properties.message).toBeDefined();
+            expect(schema.properties.count.type).toBe('integer');
+            expect(schema.properties[bodyKey], `${path} should declare ${bodyKey} array`).toBeDefined();
+            expect(schema.properties[bodyKey].type).toBe('array');
+            expect(schema.properties[bodyKey].items.$ref).toBe(`#/components/schemas/${schemaName}`);
+        }
+    });
+
     test('GET /v1/timeentry/bycompany/{id} 200 declares the {message, count, limit, offset, timeEntries} envelope', async () => {
         // Parallel to the customer/bycompany declaration in #340.
         // Pre-fix the spec said only `description: 'OK'`; SDK code-gen