diff --git a/frontend-vue/tests/schema-field-coverage.test.ts b/frontend-vue/tests/schema-field-coverage.test.ts
new file mode 100644
index 00000000..36d37803
--- /dev/null
+++ b/frontend-vue/tests/schema-field-coverage.test.ts
@@ -0,0 +1,66 @@
+import { test } from 'node:test'
+import assert from 'node:assert/strict'
+import fs from 'node:fs'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+/** task-209：核心字段 schema 覆盖冻结（spec 13 §1）。请求 user_id/task_ids；响应 taskId/resultId/fileKey/status/taskStatus/fileStatus。 */
+
+const SRC = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..', 'src')
+
+function walk(dir: string): string[] {
+  const out: string[] = []
+  for (const e of fs.readdirSync(dir, { withFileTypes: true })) {
+    const full = path.join(dir, e.name)
+    if (e.isDirectory()) out.push(...walk(full))
+    else if (e.name.endsWith('.ts') || e.name.endsWith('.vue')) out.push(full)
+  }
+  return out
+}
+
+const FILES = walk(SRC)
+
+function occurrenceCount(needle: string): number {
+  return FILES.reduce((sum, f) => {
+    const text = fs.readFileSync(f, 'utf8')
+    return sum + (text.split(needle).length - 1)
+  }, 0)
+}
+
+test('请求字段 user_id 覆盖', () => {
+  assert.ok(occurrenceCount('user_id') >= 1, 'user_id 应在共享层出现')
+})
+
+test('请求字段 task_ids 覆盖', () => {
+  assert.ok(occurrenceCount('task_ids') >= 1, 'task_ids 应在共享层出现')
+})
+
+test('响应字段 taskId 覆盖', () => {
+  assert.ok(occurrenceCount('taskId') >= 1, 'taskId 应在共享层出现')
+})
+
+test('响应字段 resultId 覆盖', () => {
+  assert.ok(occurrenceCount('resultId') >= 1, 'resultId 应在共享层出现')
+})
+
+test('响应字段 fileKey 覆盖', () => {
+  assert.ok(occurrenceCount('fileKey') >= 1, 'fileKey 应在共享层出现')
+})
+
+test('状态字段 status/taskStatus/fileStatus 覆盖', () => {
+  assert.ok(occurrenceCount('taskStatus') >= 1, 'taskStatus 应出现')
+  assert.ok(occurrenceCount('fileStatus') >= 1, 'fileStatus 应出现')
+  assert.ok(occurrenceCount('status') >= 10, 'status 应大量出现')
+})
+
+test('字段清单冻结（spec §1 集合）', () => {
+  const specFields = ['user_id', 'task_ids', 'taskId', 'resultId', 'fileKey', 'status', 'taskStatus', 'fileStatus']
+  for (const f of specFields) {
+    assert.ok(occurrenceCount(f) >= 1, `spec 字段 ${f} 应被共享 schema 覆盖`)
+  }
+})
+
+test('覆盖审计可重复、稳定', () => {
+  assert.equal(occurrenceCount('taskId'), occurrenceCount('taskId'))
+  assert.equal(occurrenceCount('user_id'), occurrenceCount('user_id'))
+})