diff --git a/README.md b/README.md
index ca5a021..fc2ae18 100644
--- a/README.md
+++ b/README.md
@@ -269,7 +269,7 @@ OpenCode 的 `location.directory` 绑定 `workspace/`，不绑定整个工作空
 
 Shell 默认在 `workspace/files/` 中运行，只能写入计算目录中的三个子目录，计算目录根只读。`chat/` 只由 Agent 服务读写，目录权限为 `0700`、记录文件为 `0600`，模型文件工具及 Shell 不能访问。OpenCode 仅为受管理的计算目录增加文件权限，插件还验证目录属于当前原生会话；其他业务记录、聊天记录和 `logs/` 继续禁止访问。目录隔离配合 Landlock 和 seccomp 限制文件访问、网络与进程行为；目录本身不等于 OS 沙箱。限制覆盖 Shell 及其子进程，OpenCode 服务和类型化业务工具仍由可信宿主进程运行。本地 stdio MCP 也不在这个沙箱中。
 
-Shell 和文件修改仍经过原生权限审批。宿主确认的后台 `task_execution` 会话对沙箱 Shell 的待审批请求自动回复 `once`，避免无人值守任务等待交互确认；不自动批准原生文件修改或业务写工具，也不覆盖明确拒绝与沙箱限制。聊天选择“请求批准”（`approval_mode=request`）时逐次询问；选择“始终允许”（`approval_mode=always`）后，Agent 自动批准本轮进入审批流程的请求，包括 Shell、文件修改和 MCP 请求。每次仅回复原生 `once`，不把本轮选择保存为后续轮次授权；明确拒绝的操作不会进入自动批准，业务权限、MCP 会话策略和沙箱限制继续执行。只读白名单工具可直接执行，不因选择“请求批准”而增加询问。
+Shell 和文件修改仍经过原生权限审批。宿主确认的后台 `task_execution` 会话对沙箱 Shell 与会话计算目录内原生文件修改的待审批请求自动回复 `once`，避免无人值守任务等待交互确认；不放开会话目录边界，不自动批准业务写工具，也不覆盖明确拒绝与沙箱限制。聊天选择“请求批准”（`approval_mode=request`）时逐次询问；选择“始终允许”（`approval_mode=always`）后，Agent 自动批准本轮进入审批流程的请求，包括 Shell、文件修改和 MCP 请求。每次仅回复原生 `once`，不把本轮选择保存为后续轮次授权；明确拒绝的操作不会进入自动批准，业务权限、MCP 会话策略和沙箱限制继续执行。只读白名单工具可直接执行，不因选择“请求批准”而增加询问。
 
 OpenCode 原生大结果仍保存在其全局工具输出目录。Shell 引用该路径时，宿主仅根据当前会话的原生 `truncated/outputPath` 元数据确认归属，将完整内容复制到当前会话 `files/` 并返回 `requires_session_path`、`relative_path`、`shell_path` 和 SHA256；本次命令尚未执行，模型使用 `shell_path` 再次调用 Shell。全局目录、其他会话结果和符号链接不会因此开放。
 
diff --git a/src/routes/chatPermissionPolicy.ts b/src/routes/chatPermissionPolicy.ts
index 67b3079..72f2193 100644
--- a/src/routes/chatPermissionPolicy.ts
+++ b/src/routes/chatPermissionPolicy.ts
@@ -1,5 +1,5 @@
 // Called only for native "asked" events. Explicit denials and host isolation
 // still run before this point; the selected round mode answers pending requests.
-export function canAutomaticallyApprove(mode: string, action: string, backgroundSandboxShell = false) {
-  return mode === "always" || (backgroundSandboxShell && action === "shell");
+export function canAutomaticallyApprove(mode: string, action: string, backgroundSandboxPermissions = false) {
+  return mode === "always" || (backgroundSandboxPermissions && (action === "shell" || action === "edit"));
 }
diff --git a/src/routes/chatStream.ts b/src/routes/chatStream.ts
index 5a92da1..3dacc1d 100644
--- a/src/routes/chatStream.ts
+++ b/src/routes/chatStream.ts
@@ -84,7 +84,7 @@ type StreamPromptOptions = {
   message: string;
   model?: SupportedModel;
   approvalMode?: ApprovalMode;
-  backgroundSandboxShell?: boolean;
+  backgroundSandboxPermissions?: boolean;
   traceId?: string;
   projectId?: string;
   signal?: AbortSignal;
@@ -149,7 +149,7 @@ export const streamPromptResponse = async ({
   message,
   model,
   approvalMode = "request",
-  backgroundSandboxShell = false,
+  backgroundSandboxPermissions = false,
   traceId,
   projectId,
   signal,
@@ -483,7 +483,7 @@ export const streamPromptResponse = async ({
           patterns: event.properties.patterns,
           elapsedMs: Math.max(0, Date.now() - requestStartedAt),
         });
-        const autoApprove = canAutomaticallyApprove(approvalMode, event.properties.permission, backgroundSandboxShell);
+        const autoApprove = canAutomaticallyApprove(approvalMode, event.properties.permission, backgroundSandboxPermissions);
         emitProgress({
           id: `permission-${event.properties.id}`,
           phase: "permission",
@@ -493,7 +493,7 @@ export const streamPromptResponse = async ({
             autoApprove
               ? approvalMode === "always"
                 ? "当前模式为本轮自动批准，已允许本次请求，不保存后续轮次授权。"
-                : "后台任务的沙箱 Shell 已自动批准；沙箱与明确拒绝规则仍生效。"
+                : "后台任务的会话内 Shell / 文件修改已自动批准；目录边界与明确拒绝规则仍生效。"
               : buildPermissionDetail(event),
         });
         if (autoApprove) {
@@ -533,7 +533,7 @@ export const streamPromptResponse = async ({
           resources: event.properties.resources,
           elapsedMs: Math.max(0, Date.now() - requestStartedAt),
         });
-        const autoApprove = canAutomaticallyApprove(approvalMode, event.properties.action, backgroundSandboxShell);
+        const autoApprove = canAutomaticallyApprove(approvalMode, event.properties.action, backgroundSandboxPermissions);
         emitProgress({
           id: `permission-${event.properties.id}`,
           phase: "permission",
@@ -543,7 +543,7 @@ export const streamPromptResponse = async ({
             autoApprove
               ? approvalMode === "always"
                 ? "当前模式为本轮自动批准，已允许本次请求，不保存后续轮次授权。"
-                : "后台任务的沙箱 Shell 已自动批准；沙箱与明确拒绝规则仍生效。"
+                : "后台任务的会话内 Shell / 文件修改已自动批准；目录边界与明确拒绝规则仍生效。"
               : buildPermissionV2Detail(event),
         });
         if (autoApprove) {
diff --git a/src/routes/chatStreamRoute.ts b/src/routes/chatStreamRoute.ts
index be59ca7..546d1b5 100644
--- a/src/routes/chatStreamRoute.ts
+++ b/src/routes/chatStreamRoute.ts
@@ -997,7 +997,7 @@ export const registerChatStreamRoute = (
           message: preparedMessage,
           model: parsed.data.model,
           approvalMode: parsed.data.approval_mode,
-          backgroundSandboxShell: sessionPurpose === "task_execution",
+          backgroundSandboxPermissions: sessionPurpose === "task_execution",
           traceId: requestContext.traceId,
           projectId: requestContext.projectId,
           signal: abortController.signal,
diff --git a/tests/routes/chatStream.test.ts b/tests/routes/chatStream.test.ts
index e8bb95d..ea49933 100644
--- a/tests/routes/chatStream.test.ts
+++ b/tests/routes/chatStream.test.ts
@@ -716,8 +716,9 @@ describe("streamPromptResponse", () => {
 });
 
 
-describe("background sandbox Shell approval", () => {
-  it.each(["permission.asked", "permission.v2.asked"])("only auto-approves sandbox Shell for %s", async (type) => {
+describe("background sandbox permissions", () => {
+  it.each([["permission.asked", true], ["permission.v2.asked", true],
+    ["permission.asked", false], ["permission.v2.asked", false]] as const)("limits session Shell/edit approval for %s background=%s", async (type, background) => {
     const replies: Array<Record<string, unknown>> = [];
     const runtime = {
       subscribeEvents: async () => createEventStream([
@@ -739,11 +740,14 @@ describe("background sandbox Shell approval", () => {
     const events: Array<{ event: string; data: Record<string, unknown> }> = [];
     await streamPromptResponse({
       runtime, sessionId: "runtime-session-1", clientSessionId: "client-session-1",
-      message: "后台调查", approvalMode: "request", backgroundSandboxShell: true,
+      message: "后台调查", approvalMode: "request", backgroundSandboxPermissions: background,
       write: (event, data) => events.push({ event, data }),
     });
-    expect(replies).toEqual([{ requestId: "shell", sessionId: "runtime-session-1", reply: "once" }]);
+    expect(replies).toEqual(background ? [
+      { requestId: "shell", sessionId: "runtime-session-1", reply: "once" },
+      { requestId: "edit", sessionId: "runtime-session-1", reply: "once" },
+    ] : []);
     expect(events.filter(({ event }) => event === "permission_request")
-      .map(({ data }) => data.permission)).toEqual(["edit", "mcp_fixture_write"]);
+      .map(({ data }) => data.permission)).toEqual(background ? ["mcp_fixture_write"] : ["shell", "edit", "mcp_fixture_write"]);
   });
 });