diff --git a/apps/backend/src/services/admin/write/task-actions.js b/apps/backend/src/services/admin/write/task-actions.ts
similarity index 85%
rename from apps/backend/src/services/admin/write/task-actions.js
rename to apps/backend/src/services/admin/write/task-actions.ts
index c7d64eee..b65f6ad3 100644
--- a/apps/backend/src/services/admin/write/task-actions.js
+++ b/apps/backend/src/services/admin/write/task-actions.ts
@@ -1,5 +1,3 @@
-// @ts-check
-
 import {
   markInventoryItemDelivered,
   releaseReservedInventoryItem,
@@ -41,15 +39,31 @@ import {
   resolveTaskInventoryGroupCodes,
 } from './shared.js'
 
-/** @typedef {import('../../../types/admin-read-inputs.js').AdminEntityIdInput} AdminEntityIdInput */
-/** @typedef {import('../../../types/admin-read-inputs.js').AdminViewerSessionInput} AdminViewerSessionInput */
-/** @typedef {import('../../../types/admin-write-models.js').AdminTaskActionResponse} AdminTaskActionResponse */
-/** @typedef {import('../../../types/admin-write-models.js').AdminTaskBindingReleaseResponse} AdminTaskBindingReleaseResponse */
-/** @typedef {import('../../../types/admin-write-models.js').AdminTaskManualDispatchResponse} AdminTaskManualDispatchResponse */
+import type {
+  AdminEntityIdInput,
+  AdminViewerSessionInput,
+} from '../../../types/admin-read-inputs.js'
+import type { AdminTaskManualDispatchInput } from '../../../types/admin-write-inputs.js'
+import type {
+  AdminTaskActionResponse,
+  AdminTaskBindingReleaseResponse,
+  AdminTaskManualDispatchResponse,
+} from '../../../types/admin-write-models.js'
+import type { TaskRow } from '../../../types/repository-rows.js'
+import type { TaskUpdatePatch } from '../../../types/repository-inputs.js'
 
-/** @returns {Promise<AdminTaskActionResponse>} */
-/** @param {AdminEntityIdInput} taskId */
-export async function releaseAdminTaskInventory(taskId) {
+type CloseAdminTaskDeps = {
+  getRequiredTask?: (taskId: AdminEntityIdInput) => Promise<TaskRow>
+  listTaskInventoryBindingsByTaskId?: (taskId: AdminEntityIdInput) => Promise<any[]>
+  releaseReservedInventoryItem?: (inventoryItemId: AdminEntityIdInput, updatedAt: string) => Promise<unknown>
+  updateClaimToken?: (tokenId: AdminEntityIdInput, patch: Record<string, unknown>) => Promise<unknown>
+  updateTask?: (taskId: AdminEntityIdInput, patch: TaskUpdatePatch) => Promise<any>
+  createTaskEvent?: (taskId: AdminEntityIdInput, eventType: string, payload: Record<string, unknown>, createdAt: string) => Promise<unknown>
+  closeTencentBrowserSession?: (sessionId: string) => Promise<unknown>
+  nowIso?: () => string
+}
+
+export async function releaseAdminTaskInventory(taskId: AdminEntityIdInput): Promise<AdminTaskActionResponse> {
   const task = await getRequiredTask(taskId)
   const primaryInventoryItemId = getTaskPrimaryInventoryItemId(task)
 
@@ -81,10 +95,10 @@ export async function releaseAdminTaskInventory(taskId) {
   }
 }
 
-/** @returns {Promise<AdminTaskBindingReleaseResponse>} */
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminEntityIdInput} bindingId */
-export async function releaseAdminTaskInventoryBinding(taskId, bindingId) {
+export async function releaseAdminTaskInventoryBinding(
+  taskId: AdminEntityIdInput,
+  bindingId: AdminEntityIdInput,
+): Promise<AdminTaskBindingReleaseResponse> {
   const task = await getRequiredTask(taskId)
   const binding = await getTaskInventoryBindingById(Number(bindingId))
 
@@ -151,10 +165,10 @@ export async function releaseAdminTaskInventoryBinding(taskId, bindingId) {
   }
 }
 
-/** @returns {Promise<AdminTaskActionResponse>} */
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function regenerateAdminTaskClaimLink(taskId, session = null) {
+export async function regenerateAdminTaskClaimLink(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<AdminTaskActionResponse> {
   const task = await getRequiredTask(taskId)
   const primaryClaimTokenId = getTaskPrimaryClaimTokenId(task)
   const viewerContext = createAdminViewerContext(session)
@@ -204,10 +218,10 @@ export async function regenerateAdminTaskClaimLink(taskId, session = null) {
   }
 }
 
-/** @returns {Promise<AdminTaskActionResponse>} */
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function confirmAdminTaskAssistedRole(taskId, session = null) {
+export async function confirmAdminTaskAssistedRole(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<AdminTaskActionResponse> {
   const task = await getRequiredTask(taskId)
   const viewerContext = createAdminViewerContext(session)
   ensureViewerCanOperateAssistedTask(task, viewerContext, 'confirm')
@@ -219,10 +233,10 @@ export async function confirmAdminTaskAssistedRole(taskId, session = null) {
   }
 }
 
-/** @returns {Promise<AdminTaskActionResponse>} */
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function redeemAdminTaskAssisted(taskId, session = null) {
+export async function redeemAdminTaskAssisted(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<AdminTaskActionResponse> {
   const task = await getRequiredTask(taskId)
   const viewerContext = createAdminViewerContext(session)
   ensureViewerCanOperateAssistedTask(task, viewerContext, 'redeem')
@@ -234,16 +248,12 @@ export async function redeemAdminTaskAssisted(taskId, session = null) {
   }
 }
 
-/** @returns {Promise<AdminTaskActionResponse>} */
-/** @param {AdminEntityIdInput} taskId */
-export async function closeAdminTask(taskId) {
+export async function closeAdminTask(taskId: AdminEntityIdInput): Promise<AdminTaskActionResponse> {
   return closeAdminTaskWithDeps(taskId)
 }
 
-/** @returns {Promise<AdminTaskActionResponse>} */
-/** @param {AdminEntityIdInput} taskId */
 export async function closeAdminTaskWithDeps(
-  taskId,
+  taskId: AdminEntityIdInput,
   {
     getRequiredTask: getTask = getRequiredTask,
     listTaskInventoryBindingsByTaskId: listBindings = listTaskInventoryBindingsByTaskId,
@@ -253,8 +263,8 @@ export async function closeAdminTaskWithDeps(
     createTaskEvent: createEvent = createTaskEvent,
     closeTencentBrowserSession: closeSession = closeTencentBrowserSession,
     nowIso: getNowIso = nowIso,
-  } = {},
-) {
+  }: CloseAdminTaskDeps = {},
+): Promise<AdminTaskActionResponse> {
   const task = await getTask(taskId)
 
   if (task.task_status === 'redeemed') {
@@ -326,9 +336,7 @@ export async function closeAdminTaskWithDeps(
   }
 }
 
-/** @returns {Promise<AdminTaskActionResponse>} */
-/** @param {AdminEntityIdInput} taskId */
-export async function markAdminTaskManualReview(taskId) {
+export async function markAdminTaskManualReview(taskId: AdminEntityIdInput): Promise<AdminTaskActionResponse> {
   const task = await getRequiredTask(taskId)
   const updatedTask = await updateTask(task.id, {
     task_status: 'manual_review',
@@ -342,9 +350,7 @@ export async function markAdminTaskManualReview(taskId) {
   }
 }
 
-/** @returns {Promise<AdminTaskActionResponse>} */
-/** @param {AdminEntityIdInput} taskId */
-export async function retryAdminTask(taskId) {
+export async function retryAdminTask(taskId: AdminEntityIdInput): Promise<AdminTaskActionResponse> {
   const task = await getRequiredTask(taskId)
   const now = nowIso()
 
@@ -408,7 +414,7 @@ export async function retryAdminTask(taskId) {
     updated_at: now,
   })
 
-  const response = {
+  const response: AdminTaskActionResponse = {
     task: mapTaskActionPayload(updatedTask),
   }
 
@@ -420,11 +426,11 @@ export async function retryAdminTask(taskId) {
   return response
 }
 
-/** @returns {Promise<AdminTaskManualDispatchResponse>} */
-/** @param {AdminEntityIdInput} taskId */
-/** @param {{ outcome?: string, resultMessage?: string, deliveryReference?: string, deliveredCredential?: string }} [payload] */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function completeAdminTaskManualDispatch(taskId, payload = {}, session = null) {
+export async function completeAdminTaskManualDispatch(
+  taskId: AdminEntityIdInput,
+  payload: AdminTaskManualDispatchInput = {},
+  session: AdminViewerSessionInput | null = null,
+): Promise<AdminTaskManualDispatchResponse> {
   const task = await getRequiredTask(taskId)
 
   if (!isManualDispatchTask(task)) {
diff --git a/docs/backend-typescript-migration-plan.md b/docs/backend-typescript-migration-plan.md
index e73ed73a..8948e195 100644
--- a/docs/backend-typescript-migration-plan.md
+++ b/docs/backend-typescript-migration-plan.md
@@ -768,6 +768,14 @@
     - `npm run typecheck`
     - `npm run build`
     - `npm test` 共 139 个用例通过
+195. 后台 Admin 任务写操作迁移到 `.ts`：
+    - `src/services/admin/write/task-actions.ts`
+196. Admin 任务库存释放、绑定释放、领取链接重建、半自动确认 / 兑换、关闭任务、转人工复核、重试、人工履约回写已进入 TS 编译链路；entity id、viewer session、手动履约 input、action response、binding release response、依赖注入 close deps 与 task patch 补齐类型
+197. Docker 内验证通过：
+    - `src/services/admin/*.test.js` 共 8 个用例通过
+    - `npm run typecheck`
+    - `npm run build`
+    - `npm test` 共 139 个用例通过
 
 ## 下一步建议