@@ -0,0 +1,9 @@
+---
+'@objectstack/core': patch
+---
+
+An import row for a sandboxed hook body that crashed, or that refused with a declared 5xx status, reads as a server fault instead of relaying the fault's text
+
+Clause-②: no
+
+When a hook body crashed during `POST /api/v1/data/:object/import` (or the async `/import/jobs` job), the row's `error` read `hook 'NAME' threw: TypeError: …`, and a hook refusal that declared a 5xx status relayed its own message. `POST /api/v1/data/:object` and `/createMany` answer both as server faults and withhold that text. The row now carries the same sentence those routes answer (`Internal server error`), and its `code` is unchanged: `IMPORT_ROW_FAILED` for a crash, the declared code for a declared 5xx. A hook refusal with no status or a 4xx status still reads in the hook's own words, and a database error's row text is unchanged.
@@ -29,10 +29,13 @@
  * §3 pins door-to-row agreement directly: the row's sentence IS what
  * `mapDataError` (the create door) answers for the same error, including for a
  * sentence `sanitizeRowError` would have paraphrased. §4 holds the controls.
+ * §5 (#22718) holds the two sandboxed failures the door answers as a fault, a
+ * crashed body and a refusal that declared a 5xx: their row reads the door's
+ * sentence.
  */
 
 import { describe, it, expect, vi } from 'vitest';
-import { mapDataError } from '@objectstack/types';
+import { mapDataError, INTERNAL_ERROR_MESSAGE } from '@objectstack/types';
 import { runImport, sanitizeRowError, type ImportProtocolLike } from './import-runner';
 import type { ExportFieldMeta } from './import-field-meta.js';
 
@@ -176,17 +179,6 @@ describe('[#22694] §3 — the row answers what the create door answers', () =>
 });
 
 describe('[#22694] §4 — controls: what the read must NOT change', () => {
-  it('CONTROL — a hook body that CRASHED is not a refusal: its row is built from `.message` exactly as before', async () => {
-    const crash = sandboxCrash();
-    const row = await rowFor(sandboxCrash);
-
-    // `sandboxBusinessMessage` declines a crash, so the native error text is
-    // never presented as the author's sentence.
-    expect(row.error).not.toBe('TypeError: boom');
-    expect(row.error).toBe(sanitizeRowError(crash.message));
-    expect(row.code).toBe('IMPORT_ROW_FAILED');
-  });
-
   it('CONTROL — a plain error whose own text looks like the wrapper is relayed as it always was', async () => {
     // No `innerMessage`: nothing about this error came from the sandbox, so a
     // pattern-strip would be the only thing that could change it.
@@ -206,5 +198,28 @@ describe('[#22694] §4 — controls: what the read must NOT change', () => {
     const sql = "insert into `mz_locked` (`name`) values ('r1') - SQLITE_BUSY: database is locked";
     const row = await rowFor(() => new Error(sql));
     expect(row.error).toBe('SQLITE_BUSY: database is locked');
+    // [#22718] The door answers this as a fault too, so §5's gate is the
+    // sandbox origin, never the door's 5xx alone.
+    expect(mapDataError(new Error(sql), OBJECT).status).toBeGreaterThanOrEqual(500);
+  });
+});
+
+/** A refusal that DECLARED a server-band status: the doors keep the status and code and withhold the prose. */
+const sandboxDeclared5xx = () => sandboxRefusal('The ledger service is down.', { status: 503, code: 'SERVICE_UNAVAILABLE' });
+
+describe('[#22718] §5 — a sandboxed body the door answers as a fault reads as that fault', () => {
+  it.each([
+    ['a body that CRASHED', sandboxCrash, 'IMPORT_ROW_FAILED', /TypeError|boom|threw:/],
+    ['a refusal that declared a 5xx', sandboxDeclared5xx, 'SERVICE_UNAVAILABLE', /ledger|threw:/],
+  ] as const)('%s', async (_label, err, code, leak) => {
+    const door = mapDataError(err(), OBJECT);
+    // Anti-vacuity: the door answers a fault and withholds the text.
+    expect(door.status).toBeGreaterThanOrEqual(500);
+    expect(door.body.error).toBe(INTERNAL_ERROR_MESSAGE);
+
+    const row = await rowFor(err);
+    // The door's sentence, never the native text or the prose; the code still reads as a fault.
+    expect(row).toEqual({ row: 1, ok: false, action: 'failed', error: door.body.error, code });
+    expect(JSON.stringify(row)).not.toMatch(leak);
   });
 });
@@ -8,7 +8,7 @@ import type { DroppedFieldsEvent } from '@objectstack/spec/data';
 import type { ExecutionContext } from '@objectstack/spec/kernel';
 import type { CreateDataRequest, FindDataRequest, UpdateDataRequest, ValidateDataIssue, ValidateDataRequest, ValidateDataResponse } from '@objectstack/spec/api';
 import { bulkWrite, withTransientRetry, defaultIsTransientError, type BulkWriteRowResult } from './bulk-write.js';
-import { isUniqueViolationError, uniqueViolationColumn, isEngineDuplicateRecordEnvelope, mapDataError, sandboxBusinessMessage } from '@objectstack/types';
+import { isUniqueViolationError, uniqueViolationColumn, isEngineDuplicateRecordEnvelope, mapDataError, sandboxBusinessMessage, isSandboxOrigin } from '@objectstack/types';
 
 /**
  * import-runner — the shared row-processing core for bulk import.
@@ -459,22 +459,37 @@ export function sanitizeRowError(raw: unknown): string {
  * passed through {@link sanitizeRowError}. That function cleans DRIVER text,
  * and an author's sentence fed to it is paraphrased: one that opens with an
  * SQL verb ("Update the cost centre first.") reads as a leaked statement and
- * comes back as the generic database sentence. A body that CRASHED is not a
- * refusal: {@link sandboxBusinessMessage} declines it, so its row is built
- * exactly as before, from `.message` through {@link sanitizeRowError}. A
- * `code` the body declared still rides, read from the error as it always was.
+ * comes back as the generic database sentence. A `code` the body declared
+ * still rides, read from the error as it always was.
+ *
+ * ## A sandboxed body the door answers as a fault reads as that fault (#22718)
+ *
+ * Two sandboxed failures are not refusals, and the create door withholds
+ * their text: a body that CRASHED (`TypeError: boom`, which
+ * {@link sandboxBusinessMessage} declines) answers `500 INTERNAL_ERROR`, and a
+ * refusal that declared a 5xx status answers that status with its prose
+ * withheld. The row used to relay both: the crash as the wrapper through
+ * {@link sanitizeRowError}, the declared 5xx as the body's prose. So for a
+ * sandboxed error the door answers with a 5xx, the row's text is the door's
+ * own sentence. Which errors are faults and what their sentence is are both
+ * `mapDataError`'s verdict, ⛔ never a second withholding rule here. The row's
+ * `code` is unchanged, so it still reads as a failed row with a fault code.
+ * Every other error keeps its row text: driver text is still cleaned by
+ * {@link sanitizeRowError}, which is the import's own reading of it.
  */
 function toFailedResult(rowNo: number, err: unknown, objectName: string): ImportRowResult {
   const e = err as { code?: unknown; message?: unknown; fields?: unknown; field?: unknown } | null | undefined;
   const first = firstFinding(e?.fields);
+  const door = mapDataError(err, objectName);
   if (first === undefined) {
-    const adopted = adoptDoorVerdict(rowNo, mapDataError(err, objectName).body);
+    const adopted = adoptDoorVerdict(rowNo, door.body);
     if (adopted !== undefined) return adopted;
   }
   const thrownCode = isEngineDuplicateRecordEnvelope(e) ? 'UNIQUE_VIOLATION' : e?.code;
   const code = first?.code ?? thrownCode ?? 'IMPORT_ROW_FAILED';
   const field = first?.field != null && first.field !== '' ? first.field : e?.field;
-  const message = sandboxBusinessMessage(err) ?? sanitizeRowError(e?.message);
+  const sandboxFault = isSandboxOrigin(err) && door.status >= 500 ? String(door.body.error) : undefined;
+  const message = sandboxFault ?? sandboxBusinessMessage(err) ?? sanitizeRowError(e?.message);
   return {
     row: rowNo, ok: false, action: 'failed', error: message, code: String(code),
     ...(field != null && field !== '' ? { field: String(field) } : {}),
 
@@ -42,7 +42,6 @@
  */
 
 import { describe, it, expect } from 'vitest';
-import { sanitizeRowError } from '@objectstack/core';
 import { RestServer } from './rest-server.js';
 import { mountAndRecordDirectRoutes } from './direct-mount-composition.js';
 import { REST_ROUTE_LEDGER } from './rest-route-ledger.js';
@@ -391,19 +390,43 @@ describe('[#22694] §3 MEASURED, NOT REPAIRED: these doors answer the debug wrap
     }
 });
 
-describe('[#22694] §4 CONTROL: a hook body that CRASHED still answers as a fault on both import doors', () => {
-    const crash = sandboxCrash();
+/** A refusal that DECLARED a server-band status: the doors keep the status and withhold the prose. */
+function sandboxDeclared5xx(): Error {
+    const err = new Error("hook 'mz_guard' threw: Error: The ledger service is down.");
+    err.name = 'SandboxError';
+    return Object.assign(err, { innerMessage: 'The ledger service is down.', status: 503, code: 'SERVICE_UNAVAILABLE' });
+}
+
+/**
+ * [#22718] A body that CRASHED and a refusal that declared a 5xx are answered
+ * as faults by the data doors, with their text withheld. Both import rows are
+ * held to that answer. §2 is the control: a refusal row keeps the hook's
+ * sentence on both import doors.
+ */
+describe('[#22718] §4 a sandboxed body the doors answer as a fault reads as that fault on both import doors', () => {
     it.each([
-        ['POST /api/v1/data/:object/import', importRow, undefined],
-        ['POST /api/v1/data/:object/import/jobs', jobRow, IMPORT_JOB_PROTOCOL],
-    ] as const)('%s', async (route, answer, protocol) => {
-        const b = boot(sandboxCrash, protocol?.(sandboxCrash));
-        const res = await drive(b, route, IMPORT_BODY);
-
-        const row = await answer(res, b);
-        // The native error text is never presented as the author's sentence;
-        // the row is built from `.message` exactly as before this card.
-        expect(row).not.toBe('TypeError: boom');
-        expect(row).toBe(sanitizeRowError(crash.message));
+        ['a body that CRASHED', sandboxCrash, /TypeError|boom/],
+        ['a refusal that declared a 5xx', sandboxDeclared5xx, /ledger/],
+    ] as const)('%s', async (_label, error, leak) => {
+        const doors: unknown[] = [];
+        for (const [route, body] of [['POST /api/v1/data/:object', { name: 'x' }], ['POST /api/v1/data/:object/createMany', [{ name: 'x' }]]] as const) {
+            const res = await drive(boot(error), route, body);
+            expect(res.statusCode, route).toBeGreaterThanOrEqual(500);
+            doors.push(sentenceOf(res.body));
+        }
+        expect(doors[1]).toBe(doors[0]);
+        expect(String(doors[0])).not.toMatch(leak);
+
+        for (const [route, answer, protocol] of [
+            ['POST /api/v1/data/:object/import', importRow, undefined],
+            ['POST /api/v1/data/:object/import/jobs', jobRow, IMPORT_JOB_PROTOCOL],
+        ] as const) {
+            const b = boot(error, protocol?.(error));
+            const row = await answer(await drive(b, route, IMPORT_BODY), b);
+
+            expect(b.calls, route).toContain('protocol.insertManyData');
+            expect(row, route).toBe(doors[0]);
+            expect(String(row), route).not.toMatch(WRAPPER_RE);
+        }
     }, 60_000);
 });