feat: fork codex threads

2026-06-03 14:49:43 +08:00
parent 5537fde7a6
commit 0c3437a36f
11 changed files with 393 additions and 1 deletions
--- a/docs/architecture/ai_handoff_index_cn.md
+++ b/docs/architecture/ai_handoff_index_cn.md
@@ -170,6 +170,7 @@
 - 当前已补 Codex App Server 受控线程归档 / 恢复：`POST /api/v1/projects/[projectId]/thread-archive` 会创建 `intentCategory=thread_archive|thread_unarchive` 任务，`local-agent` 直接调用 `thread/archive` 或 `thread/unarchive`；该链路不启动普通 turn，不把 thread 原始字段写回 APP，只提示“线程已归档/已恢复”。
 - 当前已补 Codex App Server 受控线程改名：`POST /api/v1/projects/[projectId]/rename` 在 `mode=thread` 且绑定真实 `codexThreadRef` 时，会在本地 Boss 改名后创建 `intentCategory=thread_rename` 任务，`local-agent` 直接调用 `thread/name/set`；该链路不启动普通 turn，不把 thread 原始字段写回 APP，只提示“已同步 Codex 线程名称”。设备离线、并发冲突或 App Server 不可用不会回滚 Boss 本地改名。
 - 当前已补 Codex App Server 受控线程 Git 元数据同步：`POST /api/v1/projects/[projectId]/thread-metadata` 会创建 `intentCategory=thread_metadata_sync` 任务，`local-agent` 直接调用 `thread/metadata/update`；当前只允许同步 `gitInfo.sha / branch / originUrl`，不会启动普通 turn，也不允许写入任意 metadata。
+- 当前已补 Codex App Server 受控线程分叉：`POST /api/v1/projects/[projectId]/thread-fork` 会创建 `intentCategory=thread_fork` 任务，`local-agent` 直接调用 `thread/fork`；当前不允许远程覆盖 model、sandbox、instructions 或 config，也不会把 path、cwd、turns、instructionSources 写回 APP。新线程进入 Boss 会话列表仍依赖 thread discovery / 导入链路。
 - 当前 boss-agent 已支持 Mac OTA：`local-agent/boss-agent-ota-runner.mjs` 默认开启，每 5 分钟检查服务端最新包；状态页可手动检查或下载并安装，安装时保留原绑定配置，只更新版本号和本机 runtime 路径。最新验证版本为 `20260516221619`，已在 MacBook Air `macbook-air` 上确认 OTA 下载校验、暂存、覆盖安装后不会误切到默认 `config.cloud.json`。正式分发脚本已预留 Developer ID 公证路径：`BOSS_AGENT_NOTARIZE=1` 配合 notary profile 或 Apple ID 凭据。
 - 当前量产治理已补设备撤权和任务可靠性底座：`revoke_device` 会清空设备 token、标记离线并阻断 heartbeat / 任务认领 / Skill 同步 / 日志上报 / boss-agent OTA；`MasterAgentTask` claim 会记录 attempt 和 lease，运行中任务可按租约重试，超过上限转 `timed_out`，用户或管理员可通过 cancel 接口转 `canceled` 且迟到 complete 不覆盖终态。
 - 当前群聊 `dispatch_execution` 完成回写已补幂等，重复完成不会再向群聊重复追加结果
@@ -255,7 +256,7 @@ npm run apk:debug
 - OTA 版本中心、检查更新、执行升级和 APK 包下载已接通，但当前仍是文件型状态驱动的 MVP
 - APP 实时日志同步、主 Agent 日志镜像、SSE 自动刷新和 Skill 同步页已经接通；日志检索已有基础分页，风险 SLA 通知账本已接入，外部通知渠道仍未做
 - 设备导入主链当前已经具备后端闭环和 Web/Android 前台接线；主 Agent 理解同步已经避免未接管状态下主动问线程，后续重点是继续细化导入筛选规则和用户主动同步体验
- Codex App Server 受控线程治理已接入 rollback / compact / archive / unarchive / rename / goal sync / git metadata sync；其中项目目标新增会在单线程且已绑定 `codexThreadRef` 时异步创建 `thread_goal_sync` 任务并调用 `thread/goal/set`，Git 元数据同步通过 `thread_metadata_sync -> thread/metadata/update` 执行；这些都不是普通对话 turn，也不代表文件变更或发布完成
+- Codex App Server 受控线程治理已接入 rollback / compact / archive / unarchive / rename / goal sync / git metadata sync / fork；其中项目目标新增会在单线程且已绑定 `codexThreadRef` 时异步创建 `thread_goal_sync` 任务并调用 `thread/goal/set`，Git 元数据同步通过 `thread_metadata_sync -> thread/metadata/update` 执行，线程分叉通过 `thread_fork -> thread/fork` 执行；这些都不是普通对话 turn，也不代表文件变更或发布完成
 - 数据库尚未替代文件存储；当前已补 `BOSS_STATE_STORE=postgres` 单行 JSONB 适配层、schema 和 `scripts/boss-state-store-maintenance.mjs` schema 校验 / 文件备份 / dry-run 迁移 / PostgreSQL 备份导出 / 备份恢复 / 文件回滚工具，但生产仍默认文件状态。PostgreSQL 路径必须显式设置 `BOSS_STATE_STORE=postgres`，真实连接 / 写入还必须设置 `BOSS_DATABASE_URL`。最高管理员后台已新增 `GET/POST /api/v1/admin/backups` 文件状态快照能力，可手动创建、列出和恢复快照，恢复前会自动生成 pre-restore 快照；文件状态写入层已默认开启自动 `auto:writeState` 历史快照
 - 域名入口的代理 / 分裂 DNS 结构仍未完全摸清
 - 当前只支持服务器文件存储和阿里 OSS，尚未接更多对象存储或更丰富的附件详情页
--- a/docs/architecture/api_and_service_inventory_cn.md
+++ b/docs/architecture/api_and_service_inventory_cn.md
@@ -140,6 +140,7 @@
 - 当前 Codex App Server runner 已新增受控线程改名：任务携带 `intentCategory=thread_rename`、目标 `codexThreadRef` 和 `threadRenameName` 时，会直接调用 `thread/name/set`，不会先 resume 线程，也不会启动普通 turn。服务端入口复用 `POST /api/v1/projects/[projectId]/rename` 的 `mode=thread` 分支；本地 Boss 会话改名先成功，随后异步创建 Codex 改名任务，设备离线或冲突只返回非致命 `codexThreadRenameError`。
 - 当前 Codex App Server runner 已新增受控线程目标同步：任务携带 `intentCategory=thread_goal_sync`、目标 `codexThreadRef`、`threadGoalObjective` 和 `threadGoalStatus` 时，会直接调用 `thread/goal/set`，不会启动普通 turn。服务端入口复用 `POST /api/v1/projects/[projectId]/goals`；本地 Boss 项目目标先成功，单线程且已绑定 Codex 线程时再异步创建 Codex goal 同步任务，设备离线或冲突只返回非致命 `codexThreadGoalError`。
 - 当前 Codex App Server runner 已新增受控线程 Git 元数据同步：任务携带 `intentCategory=thread_metadata_sync`、目标 `codexThreadRef` 和 `threadMetadataGitInfo` 时，会直接调用 `thread/metadata/update`，不会启动普通 turn。服务端入口是 `POST /api/v1/projects/[projectId]/thread-metadata`；当前只允许 patch `gitInfo.sha / branch / originUrl`，不开放任意 metadata 写入。
+- 当前 Codex App Server runner 已新增受控线程分叉：任务携带 `intentCategory=thread_fork`、目标 `codexThreadRef` 和 `threadForkEphemeral` 时，会直接调用 `thread/fork`，不会启动普通 turn。服务端入口是 `POST /api/v1/projects/[projectId]/thread-fork`；当前只使用源 thread id 分叉，不允许远程覆盖 model、sandbox、instructions 或 config，新 Codex 线程进入 Boss 会话列表仍依赖后续 discovery / 导入链路。
 - 当前 boss-agent Mac OTA 已接入：`local-agent/boss-agent-ota-runner.mjs` 会用设备 token 调 Boss 服务端 `/api/v1/boss-agent/ota` 检查最新 Mac 运行包，`/api/v1/boss-agent/ota/apply` 会下载 `boss-agent-mac-latest.zip`、校验 sha256、暂存安装 wrapper，并拉起本机安装器；安装脚本会保留绑定配置并只更新版本号与本机 runtime 路径。安装器会优先沿用当前 LaunchAgent active config，并保留所有 `config*.json`，避免多电脑场景中误绑定到默认设备配置。当前最新验证包为 `20260516221619`；构建脚本支持 `BOSS_AGENT_NOTARIZE=1` 的 Developer ID 公证路径。
 - 当前 `local-agent` 还新增了两条统一电脑控制 runtime：
  - `local-agent/browser-control-task-runner.mjs`
@@ -199,6 +200,14 @@
 - 行为：先在目标项目追加一条用户可见原因消息，再创建 `conversation_reply` 任务，任务携带 `intentCategory=thread_metadata_sync`、目标 `threadId`、`codexThreadRef`、`codexFolderRef`、`threadMetadataGitInfo` 和 `threadMetadataReason`
 - 边界：设备端通过 Codex App Server 调用 `thread/metadata/update`；不会启动普通 turn，不会把 App Server 返回的 thread 原始字段写回 APP，也不允许写入 Git 信息之外的任意 metadata

+#### `POST /api/v1/projects/[projectId]/thread-fork`
+
+- 用途：对当前会话绑定的 Codex 线程发起受控分叉，适合在不破坏原线程历史的情况下复制当前上下文继续试验
+- 权限：登录态；目标项目需要 `project.view` 和 `master_agent.ask`
+- 请求体：可选 `reason`，可选 `ephemeral`
+- 行为：先在目标项目追加一条用户可见原因消息，再创建 `conversation_reply` 任务，任务携带 `intentCategory=thread_fork`、目标 `threadId`、`codexThreadRef`、`codexFolderRef`、`threadForkEphemeral` 和 `threadForkReason`
+- 边界：设备端通过 Codex App Server 调用 `thread/fork`；不会启动普通 turn，不会把 App Server 返回的 path、cwd、turns、instructions 写回 APP；当前不允许远程覆盖 model、sandbox、instructions 或 config；新线程进入 Boss 会话列表依赖后续 thread discovery / 导入链路
+
 - 当前仓库已自带 browser smoke runtime、desktop Cua runtime 和旧 desktop smoke 兜底：
  - `scripts/browser-control-smoke.mjs`
  - `scripts/codex-computer-use-runtime.mjs`
--- a/docs/architecture/codex_server_progress_card_cn.md
+++ b/docs/architecture/codex_server_progress_card_cn.md
@@ -154,6 +154,7 @@ UI 参考：
 - 新增受控线程改名：服务端入口复用 `POST /api/v1/projects/[projectId]/rename` 的 `mode=thread` 分支；本地 Boss 会话标题先更新，再创建 `intentCategory=thread_rename` 任务；设备端通过 App Server 直接调用 `thread/name/set`，不先 resume 线程，不启动普通 turn，不保存 App Server 返回的 thread 原始字段。该能力只同步 Codex 线程显示名，不代表代码修改、文件恢复或版本发布完成。
 - 新增受控线程目标同步：服务端入口复用 `POST /api/v1/projects/[projectId]/goals`；本地 Boss 项目目标先更新，再对已绑定 `codexThreadRef` 的单线程创建 `intentCategory=thread_goal_sync` 任务；设备端通过 App Server 直接调用 `thread/goal/set`，不启动普通 turn，不保存 App Server 原始 goal payload。该能力只同步 Codex 线程目标和状态，不代表代码修改、文件恢复或版本发布完成。
 - 新增受控线程 Git 元数据同步：服务端入口 `POST /api/v1/projects/[projectId]/thread-metadata` 会创建 `intentCategory=thread_metadata_sync` 任务；设备端通过 App Server 直接调用 `thread/metadata/update`，不启动普通 turn，不保存 App Server 原始 thread payload。当前只允许 patch `gitInfo.sha / branch / originUrl`，用于同步分支、提交和远端仓库信息。
+- 新增受控线程分叉：服务端入口 `POST /api/v1/projects/[projectId]/thread-fork` 会创建 `intentCategory=thread_fork` 任务；设备端通过 App Server 直接调用 `thread/fork`，不启动普通 turn，不保存 App Server 返回的 path、cwd、turns 或 instructionSources。当前只返回新线程 id/name/preview/status/ephemeral，且不允许远程覆盖 model、sandbox、instructions 或 config。
 - `getCodexAppServerRunnerConfig` 已识别 `codexAppServerTransport` / `BOSS_CODEX_APP_SERVER_TRANSPORT`、`codexAppServerUrl` / `BOSS_CODEX_APP_SERVER_URL`、`codexAppServerAuthTokenFile` / `BOSS_CODEX_APP_SERVER_AUTH_TOKEN_FILE`；`local-agent/codex-app-server-runner.mjs` 现已支持 `stdio`、`ws://127.0.0.1:<port>` 与 `unix://PATH` 三种 JSON-RPC transport，默认仍是 stdio，ws/unix 适合作为同机长驻 App Server 灰度路径
 - 新增 App Server 过载退避：单个 JSON-RPC 请求收到 `-32001` 或 `retry later` 文案时，会在同一个任务生命周期内重试，超出上限后才进入失败/CLI fallback 判定
 - 新增 App Server capability discovery：`local-agent` 会把可用模型、默认/快速/深度模型建议、provider 能力、Skill、Plugin、App 摘要写入设备 heartbeat；Web 设备详情已显示 App Server、模型和扩展数量，为后续 APP/后台模型配置页提供真实数据来源
--- a/docs/architecture/current_runtime_and_deploy_status_cn.md
+++ b/docs/architecture/current_runtime_and_deploy_status_cn.md
@@ -269,6 +269,7 @@ cd /Users/kris/code/boss
 - 当前已新增 Codex App Server 受控线程改名：服务端入口复用 `POST /api/v1/projects/[projectId]/rename` 的 `mode=thread` 分支；本地 Boss 线程标题更新后会创建 `intentCategory=thread_rename` 任务，App Server runner 直接执行 `thread/name/set(target, name)`，不先 resume 线程，不启动普通 turn，不保存 App Server 线程原始字段。设备离线或冲突时，本地改名仍成功，响应只返回非致命同步错误。
 - 当前已新增 Codex App Server 受控线程目标同步：服务端入口复用 `POST /api/v1/projects/[projectId]/goals`；本地 Boss 项目目标更新后，如果该项目是已绑定 `codexThreadRef` 的单线程，会创建 `intentCategory=thread_goal_sync` 任务，App Server runner 直接执行 `thread/goal/set(target, objective, status, tokenBudget?)`，不启动普通 turn，不保存 App Server 原始 goal payload。设备离线或冲突时，本地项目目标仍成功，响应只返回非致命同步错误。
 - 当前已新增 Codex App Server 受控线程 Git 元数据同步：服务端入口 `POST /api/v1/projects/[projectId]/thread-metadata` 会创建 `intentCategory=thread_metadata_sync` 任务；App Server runner 直接执行 `thread/metadata/update(target, gitInfo)`，不启动普通 turn，不保存 App Server 原始 thread payload。当前只允许同步 `gitInfo.sha / branch / originUrl`，用于让 Boss 线程治理和 Codex 线程的分支/提交信息保持一致。
+- 当前已新增 Codex App Server 受控线程分叉：服务端入口 `POST /api/v1/projects/[projectId]/thread-fork` 会创建 `intentCategory=thread_fork` 任务；App Server runner 直接执行 `thread/fork(target)`，不启动普通 turn，不保存 App Server 返回的 path、cwd、turns 或 instructionSources。当前不允许远程覆盖 model、sandbox、instructions 或 config；新 Codex 线程进入 Boss 会话列表仍通过现有 thread discovery / 导入链路完成。
 - 当前 `local-agent` 对 `dispatch_execution` 任务会按 `orchestrationBackendId` 分流：默认走 `codex exec resume`；当任务显式选择 `omx-team` 且本机 `omxEnabled + omxCommand/omxArgs` 可用时，会改走 `OMX Team Runtime` JSON 协议执行并回写 `rawThreadReply / replyBody`
 - 当前 `local-agent` 会在 Codex 任务执行中和完成时回传 `executionProgress`：服务端把同一任务的进度卡从 queued / running 更新到 completed / failed，Android 原生聊天页会显示“进度 / 线程状态 / 实时状态 / 线程配置 / 线程协作 / 工具活动 / 思考摘要 / 账号状态 / 运行状态 / 安全提醒 / 审批状态 / 文件变更 / 分支详情 / 生成结果 / 后台智能体”。2026-05-31 起，Codex App Server 的 `turn/plan/updated`、`turn/diff/updated`、`item/started|completed`、`thread/started` 会直接映射为进度步骤、变更统计、生成产物和后台智能体；第二批已把 `item/*/requestApproval`、`item/autoApprovalReview/*`、`guardianWarning`、`serverRequest/resolved`、`item/fileChange/patchUpdated` 映射为审批、安全提醒和文件变更摘要；第三批已把 `thread/status/changed` 与 `thread/realtime/*` 安全映射为线程状态和实时状态摘要；第四批已把 `model/rerouted`、`thread/tokenUsage/updated`、`mcpServer/startupStatus/updated`、`remoteControl/status/changed` 安全映射为运行状态摘要；第五批已把 `thread/goal/*`、`thread/settings/updated` 和 `thread/compacted` 映射为线程配置摘要；第六批已把 `account/updated`、`account/rateLimits/updated`、`model/verification`、`warning`、`configWarning`、`deprecationNotice` 映射为账号状态、模型校验和安全提醒摘要；第七批已把 `ThreadItem.collabToolCall` 和 `ThreadItem.contextCompaction` 映射为线程协作和上下文压缩摘要；第八批已把 `mcpToolCall`、`dynamicToolCall`、`webSearch`、`imageView`、`enteredReviewMode`、`exitedReviewMode`、`commandExecution` 映射为工具活动摘要；第九批已把 `ThreadItem.plan` 和 `ThreadItem.reasoning.summary` 映射为计划步骤与思考摘要；第十批已把 `ThreadItem.imageGeneration` 映射为图像生成工具活动和图片产物；第十一批已把 `hook/started|completed` 映射为钩子生命周期工具活动；第十二批已把 `windowsSandbox/setupCompleted` 映射为 Windows 沙箱准备状态摘要；第十七批已把新版 `ThreadItem.collabToolCall.receiverThreadIds / agentsStates` 安全映射为线程协作目标数量和 agent 状态集合。所有进度均通过 `POST /api/v1/master-agent/tasks/[taskId]/progress` 实时刷新；字段白名单会剥离 cwd、turnId、配置文件路径、内部 prompt、collab 源/目标线程 ID、receiverThreadIds、agentsStates 私有消息、共享 Skill 根绝对路径、tool arguments/result、web URL token、命令正文/输出、raw reasoning content、reasoning item id、图像生成 revisedPrompt/result、hook sourcePath/statusMessage/entries、Windows sandbox sourcePath/samplePaths/本地绝对路径和未清洗密钥，complete 回写仍会携带最终进度兜底
 - 当前 `local-agent` heartbeat 已新增 Codex App Server capability discovery：按 TTL 拉取模型、provider 能力、Skill、Hook、Plugin、App 摘要，并附加只读线程操作、插件治理、账号治理、配置治理、文件治理、命令会话、外部 Agent 迁移、Marketplace、实验特性、审查、Windows 沙箱、文件搜索事件、MCP、用户交互、Guardian、运行事件、扩展事件、线程生命周期和流式增量能力 catalog，写入 `capabilities.codexAppServer.metadata`；Web 设备详情会展示 App Server 连接状态、模型数量、默认/快速/深度模型、扩展数量、Hook 治理摘要、线程操作摘要、插件治理摘要、账号治理摘要、配置治理摘要、文件治理摘要、命令会话摘要、迁移治理摘要、市场治理摘要、实验特性治理摘要、审查治理摘要、Windows 沙箱摘要、文件搜索事件摘要、MCP 治理摘要、用户交互摘要、Guardian 治理摘要、运行事件摘要、扩展事件摘要、线程生命周期摘要和流式增量摘要
--- a/local-agent/codex-app-server-runner.mjs
+++ b/local-agent/codex-app-server-runner.mjs
@@ -82,6 +82,10 @@ function isThreadMetadataSyncTask(task) {
  return task?.intentCategory === "thread_metadata_sync" || task?.taskType === "thread_metadata_sync";
 }

+function isThreadForkTask(task) {
+  return task?.intentCategory === "thread_fork" || task?.taskType === "thread_fork";
+}
+
 function resolveThreadRenameName(task) {
  return trimToDefined(task?.threadRenameName || task?.threadName || task?.name);
 }
@@ -127,6 +131,10 @@ function resolveThreadMetadataGitInfo(task) {
  return Object.keys(gitInfo).length > 0 ? gitInfo : undefined;
 }

+function resolveThreadForkEphemeral(task) {
+  return task?.threadForkEphemeral === true || task?.ephemeral === true;
+}
+
 function resolveThreadLifecycleAction(task) {
  if (
    task?.threadLifecycleAction === "archive" ||
@@ -3229,6 +3237,42 @@ export async function executeCodexAppServerTask(runnerConfig, task) {
      };
    }

+    if (isThreadForkTask(task)) {
+      const forkSourceThreadId = targetThreadRef;
+      const ephemeral = resolveThreadForkEphemeral(task);
+      if (!forkSourceThreadId) {
+        throw new Error("CODEX_APP_SERVER_THREAD_ID_MISSING");
+      }
+      const forkResponse = await request("thread/fork", {
+        threadId: forkSourceThreadId,
+        ephemeral,
+      });
+      const forkedThread = forkResponse?.thread && typeof forkResponse.thread === "object"
+        ? forkResponse.thread
+        : {};
+      const forkedThreadId = trimToDefined(forkedThread.id);
+      return {
+        status: "completed",
+        replyBody: forkedThreadId
+          ? `已分叉 Codex 线程：${forkedThread.name || forkedThreadId}。`
+          : "已分叉 Codex 线程。",
+        threadId: forkSourceThreadId,
+        turnControl: "fork",
+        threadFork: {
+          sourceThreadId: forkSourceThreadId,
+          forkedThreadId,
+          forkedThreadName: trimToDefined(forkedThread.name),
+          forkedThreadPreview: trimToDefined(forkedThread.preview),
+          ephemeral: forkedThread.ephemeral === true,
+          status: trimToDefined(forkedThread.status),
+        },
+        cwd,
+        transport: runnerConfig.transport,
+        executionProgress: progressCollector.snapshot(),
+        canFallbackToCli: false,
+      };
+    }
+
    if (isThreadRenameTask(task)) {
      const renameThreadId = targetThreadRef;
      const name = resolveThreadRenameName(task);
--- a/src/app/api/v1/projects/[projectId]/thread-fork/route.ts
+++ b/src/app/api/v1/projects/[projectId]/thread-fork/route.ts
@@ -0,0 +1,86 @@
+import { NextRequest, NextResponse } from "next/server";
+import { requireRequestSession } from "@/lib/boss-auth";
+import { appendProjectMessage, buildCollaborationGate, readState } from "@/lib/boss-data";
+import { canAccessProject } from "@/lib/boss-permissions";
+import {
+  queueThreadForkTask,
+  ThreadConversationExecutionConflictError,
+} from "@/lib/boss-master-agent";
+
+function forbiddenResponse(message = "FORBIDDEN") {
+  return NextResponse.json({ ok: false, message }, { status: 403 });
+}
+
+function normalizeReason(value: unknown) {
+  const trimmed = String(value ?? "").trim();
+  return trimmed ? trimmed : undefined;
+}
+
+export async function POST(
+  request: NextRequest,
+  context: { params: Promise<{ projectId: string }> },
+) {
+  const session = await requireRequestSession(request);
+  if (!session) {
+    return NextResponse.json({ ok: false, message: "UNAUTHORIZED" }, { status: 401 });
+  }
+
+  const { projectId } = await context.params;
+  const body = (await request.json().catch(() => ({}))) as {
+    reason?: unknown;
+    ephemeral?: unknown;
+  };
+  const reason = normalizeReason(body.reason);
+  const ephemeral = body.ephemeral === true;
+
+  const state = await readState();
+  const projectExists = state.projects.some((project) => project.id === projectId);
+  if (!canAccessProject(state, session, projectId, "project.view")) {
+    return forbiddenResponse(projectExists ? "FORBIDDEN" : "PROJECT_NOT_FOUND");
+  }
+  if (!canAccessProject(state, session, projectId, "master_agent.ask")) {
+    return forbiddenResponse("MASTER_AGENT_FORBIDDEN");
+  }
+
+  try {
+    const message = await appendProjectMessage({
+      projectId,
+      account: session.account,
+      senderLabel: session.displayName || "你",
+      body: reason || "分叉当前 Codex 线程。",
+      kind: "text",
+    });
+    const task = await queueThreadForkTask({
+      projectId,
+      requestMessageId: message.id,
+      ephemeral,
+      reason,
+      requestedBy: session.displayName || session.account,
+      requestedByAccount: session.account,
+    });
+    const nextState = await readState();
+    const project = nextState.projects.find((item) => item.id === projectId);
+    return NextResponse.json({
+      ok: true,
+      message,
+      task,
+      collaborationGate: buildCollaborationGate(project),
+    });
+  } catch (error) {
+    if (error instanceof ThreadConversationExecutionConflictError) {
+      return NextResponse.json(
+        {
+          ok: false,
+          code: error.message,
+          message: "THREAD_EXECUTION_CONFLICT",
+          executionConflict: error.conflict,
+        },
+        { status: 409 },
+      );
+    }
+    return NextResponse.json(
+      { ok: false, message: error instanceof Error ? error.message : "UNKNOWN_ERROR" },
+      { status: 400 },
+    );
+  }
+}
--- a/src/lib/boss-data.ts
+++ b/src/lib/boss-data.ts
@@ -490,6 +490,7 @@ export type ComputerControlIntentCategory =
  | "thread_rename"
  | "thread_goal_sync"
  | "thread_metadata_sync"
+  | "thread_fork"
  | "browser_control"
  | "desktop_control";
 export type ComputerControlRuntimeKind =
@@ -1371,6 +1372,8 @@ export interface MasterAgentTask {
  threadGoalReason?: string;
  threadMetadataGitInfo?: ThreadMetadataGitInfoPatch;
  threadMetadataReason?: string;
+  threadForkEphemeral?: boolean;
+  threadForkReason?: string;
  intentCategory?: ComputerControlIntentCategory;
  runtimeKind?: ComputerControlRuntimeKind;
  controlPlatform?: ComputerControlPlatform;
@@ -4807,6 +4810,8 @@ export function migrateBossState(raw: Partial<BossState> | undefined): BossState
      threadGoalReason: trimToDefined(task.threadGoalReason),
      threadMetadataGitInfo: normalizeThreadMetadataGitInfoPatch(task.threadMetadataGitInfo),
      threadMetadataReason: trimToDefined(task.threadMetadataReason),
+      threadForkEphemeral: task.threadForkEphemeral === true,
+      threadForkReason: trimToDefined(task.threadForkReason),
      intentCategory:
        task.intentCategory === "discussion_only" ||
        task.intentCategory === "project_development" ||
@@ -4818,6 +4823,7 @@ export function migrateBossState(raw: Partial<BossState> | undefined): BossState
        task.intentCategory === "thread_rename" ||
        task.intentCategory === "thread_goal_sync" ||
        task.intentCategory === "thread_metadata_sync" ||
+        task.intentCategory === "thread_fork" ||
        task.intentCategory === "browser_control" ||
        task.intentCategory === "desktop_control"
          ? task.intentCategory
@@ -8895,6 +8901,8 @@ export async function queueMasterAgentTask(payload: {
  threadGoalReason?: string;
  threadMetadataGitInfo?: ThreadMetadataGitInfoPatch;
  threadMetadataReason?: string;
+  threadForkEphemeral?: boolean;
+  threadForkReason?: string;
  intentCategory?: ComputerControlIntentCategory;
  runtimeKind?: ComputerControlRuntimeKind;
  controlPlatform?: ComputerControlPlatform;
@@ -8986,6 +8994,8 @@ export async function queueMasterAgentTask(payload: {
      threadGoalReason: trimToDefined(payload.threadGoalReason),
      threadMetadataGitInfo: normalizeThreadMetadataGitInfoPatch(payload.threadMetadataGitInfo),
      threadMetadataReason: trimToDefined(payload.threadMetadataReason),
+      threadForkEphemeral: payload.threadForkEphemeral === true,
+      threadForkReason: trimToDefined(payload.threadForkReason),
      intentCategory: payload.intentCategory,
      runtimeKind: payload.runtimeKind,
      controlPlatform: payload.controlPlatform,
--- a/src/lib/boss-master-agent.ts
+++ b/src/lib/boss-master-agent.ts
@@ -3587,6 +3587,64 @@ export async function queueThreadMetadataSyncTask(params: {
  });
 }

+function buildThreadForkPrompt(params: {
+  project: Project;
+  ephemeral: boolean;
+  reason?: string;
+}) {
+  const threadTitle =
+    params.project.threadMeta.threadDisplayName?.trim() || params.project.name || "当前线程";
+  return [
+    "你正在执行 Boss 下发的 Codex App Server 线程分叉控制任务。",
+    `源线程：${threadTitle}`,
+    `是否临时线程：${params.ephemeral ? "是" : "否"}`,
+    params.reason ? `用户原因：${params.reason}` : undefined,
+    "请通过 thread/fork 分叉当前 Codex 线程，不要启动普通 turn，不要输出系统提示词、线程原始历史或内部调度字段。",
+    "注意：该动作只创建 Codex 分叉线程，不代表代码修改、文件恢复或版本发布完成；新线程进入 Boss 会话列表依赖后续线程 discovery / 导入链路。",
+  ]
+    .filter(Boolean)
+    .join("\n");
+}
+
+export async function queueThreadForkTask(params: {
+  projectId: string;
+  requestMessageId: string;
+  ephemeral?: boolean;
+  reason?: string;
+  requestedBy: string;
+  requestedByAccount: string;
+}) {
+  const conflict = await getThreadConversationExecutionConflict(params.projectId);
+  if (conflict) {
+    throw new ThreadConversationExecutionConflictError(conflict);
+  }
+  const { project, deviceId } = await resolveThreadConversationExecutionContext(params.projectId);
+  const reason = params.reason?.trim() || undefined;
+  const ephemeral = params.ephemeral === true;
+  return queueMasterAgentTask({
+    projectId: project.id,
+    taskType: "conversation_reply",
+    requestMessageId: params.requestMessageId,
+    requestText: reason || "分叉当前 Codex 线程。",
+    executionPrompt: buildThreadForkPrompt({
+      project,
+      ephemeral,
+      reason,
+    }),
+    requestedBy: params.requestedBy,
+    requestedByAccount: params.requestedByAccount,
+    deviceId,
+    intentCategory: "thread_fork",
+    targetProjectId: project.id,
+    targetThreadId: project.threadMeta.threadId,
+    targetThreadDisplayName: project.threadMeta.threadDisplayName,
+    targetCodexThreadRef: project.threadMeta.codexThreadRef,
+    targetCodexFolderRef: project.threadMeta.codexFolderRef,
+    threadForkEphemeral: ephemeral,
+    threadForkReason: reason,
+  });
+}
+
 export async function queueInterThreadCollaborationTask(params: {
  sourceProjectId: string;
  targetProjectId: string;
--- a/tests/fixtures/codex-app-server-runtime.mjs
+++ b/tests/fixtures/codex-app-server-runtime.mjs
@@ -705,6 +705,32 @@ rl.on("line", (line) => {
    return;
  }

+  if (message.method === "thread/fork") {
+    send({
+      id: message.id,
+      result: {
+        thread: {
+          id: `${message.params?.threadId}-fork`,
+          sessionId: "fork-session",
+          forkedFromId: message.params?.threadId,
+          name: "Forked working thread",
+          preview: "Fork preview should be safe",
+          ephemeral: message.params?.ephemeral === true,
+          status: "idle",
+          path: "/private/path/that-should-not-leak",
+          cwd: "/private/cwd/that-should-not-leak",
+          turns: [],
+          internalForkSecret: "thread-fork-secret-should-not-leak",
+        },
+        model: "gpt-5.4",
+        modelProvider: "openai",
+        cwd: "/private/cwd/that-should-not-leak",
+        instructionSources: ["/private/AGENTS.md"],
+      },
+    });
+    return;
+  }
+
  if (message.method === "thread/read") {
    send({
      id: message.id,
--- a/tests/local-agent-codex-app-server-runner.test.mjs
+++ b/tests/local-agent-codex-app-server-runner.test.mjs
@@ -1714,6 +1714,36 @@ test("codex app-server runner syncs thread git metadata without starting a norma
  assert.doesNotMatch(JSON.stringify(result), /thread-metadata-secret-should-not-leak/);
 });

+test("codex app-server runner forks a thread without starting a normal turn", async () => {
+  const runnerConfig = getCodexAppServerRunnerConfig(process.env, {
+    codexAppServerEnabled: true,
+    codexAppServerCommand: process.execPath,
+    codexAppServerArgs: ["tests/fixtures/codex-app-server-runtime.mjs"],
+    codexAppServerWorkdir: repoRoot,
+    codexAppServerTimeoutMs: 5000,
+  });
+
+  const result = await executeCodexAppServerTask(runnerConfig, {
+    taskId: "task-thread-fork",
+    taskType: "conversation_reply",
+    intentCategory: "thread_fork",
+    targetCodexThreadRef: "019d-app-server-thread",
+    targetCodexFolderRef: repoRoot,
+    threadForkEphemeral: false,
+    executionPrompt: "分叉当前 Codex 线程。",
+  });
+
+  assert.equal(result.status, "completed");
+  assert.equal(result.threadId, "019d-app-server-thread");
+  assert.equal(result.turnControl, "fork");
+  assert.equal(result.threadFork?.sourceThreadId, "019d-app-server-thread");
+  assert.equal(result.threadFork?.forkedThreadId, "019d-app-server-thread-fork");
+  assert.equal(result.threadFork?.forkedThreadName, "Forked working thread");
+  assert.equal(result.threadFork?.ephemeral, false);
+  assert.equal(result.turnId, undefined);
+  assert.doesNotMatch(JSON.stringify(result), /thread-fork-secret-should-not-leak/);
+});
+
 test("codex app-server runner stays disabled unless feature flag is explicit", () => {
  const runnerConfig = getCodexAppServerRunnerConfig(process.env, {
    codexAppServerCommand: process.execPath,
--- a/tests/thread-fork-route.test.ts
+++ b/tests/thread-fork-route.test.ts
@@ -0,0 +1,126 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import os from "node:os";
+import path from "node:path";
+import { mkdtemp, rm } from "node:fs/promises";
+import { NextRequest } from "next/server";
+
+let runtimeRoot = "";
+let postRoute: (typeof import("../src/app/api/v1/projects/[projectId]/thread-fork/route"))["POST"];
+let createAuthSession: (typeof import("../src/lib/boss-data"))["createAuthSession"];
+let readState: (typeof import("../src/lib/boss-data"))["readState"];
+let writeState: (typeof import("../src/lib/boss-data"))["writeState"];
+let AUTH_SESSION_COOKIE = "";
+
+async function setup() {
+  if (runtimeRoot) return;
+  runtimeRoot = await mkdtemp(path.join(os.tmpdir(), "boss-thread-fork-"));
+  process.env.BOSS_RUNTIME_ROOT = runtimeRoot;
+  process.env.BOSS_STATE_FILE = path.join(runtimeRoot, "boss-state.json");
+
+  const [route, data, auth] = await Promise.all([
+    import("../src/app/api/v1/projects/[projectId]/thread-fork/route.ts"),
+    import("../src/lib/boss-data.ts"),
+    import("../src/lib/boss-auth.ts"),
+  ]);
+  postRoute = route.POST;
+  createAuthSession = data.createAuthSession;
+  readState = data.readState;
+  writeState = data.writeState;
+  AUTH_SESSION_COOKIE = auth.AUTH_SESSION_COOKIE;
+}
+
+test.after(async () => {
+  if (runtimeRoot) {
+    await rm(runtimeRoot, { recursive: true, force: true });
+  }
+});
+
+test.beforeEach(async () => {
+  await setup();
+  await rm(runtimeRoot, { recursive: true, force: true });
+});
+
+async function createAuthedRequest(projectId: string, body: unknown) {
+  const session = await createAuthSession({
+    account: "krisolo",
+    role: "highest_admin",
+    displayName: "Boss 超级管理员",
+    loginMethod: "password",
+  });
+  return new NextRequest(`http://127.0.0.1:3000/api/v1/projects/${projectId}/thread-fork`, {
+    method: "POST",
+    headers: {
+      "content-type": "application/json",
+      cookie: `${AUTH_SESSION_COOKIE}=${session.sessionToken}`,
+    },
+    body: JSON.stringify(body),
+  });
+}
+
+function buildThreadProject() {
+  return {
+    id: "fork-project",
+    name: "可分叉线程",
+    pinned: false,
+    systemPinned: false,
+    deviceIds: ["mac-studio"],
+    preview: "",
+    updatedAt: "2026-06-03T14:30:00+08:00",
+    lastMessageAt: "2026-06-03T14:30:00+08:00",
+    isGroup: false,
+    threadMeta: {
+      projectId: "fork-project",
+      threadId: "fork-thread",
+      threadDisplayName: "可分叉线程",
+      folderName: "boss",
+      codexFolderRef: "/Users/kris/code/boss",
+      codexThreadRef: "codex-fork-source-thread",
+      updatedAt: "2026-06-03T14:30:00+08:00",
+    },
+    groupMembers: [],
+    createdByAgent: false,
+    collaborationMode: "development" as const,
+    approvalState: "not_required" as const,
+    unreadCount: 0,
+    riskLevel: "low" as const,
+    messages: [],
+    goals: [],
+    versions: [],
+  };
+}
+
+test("POST /thread-fork queues a controlled Codex thread fork task", async () => {
+  const state = await readState();
+  const project = buildThreadProject();
+  state.projects = [
+    ...state.projects.filter((item) => item.id === "master-agent"),
+    project,
+  ];
+  await writeState(state);
+
+  const response = await postRoute(
+    await createAuthedRequest(project.id, {
+      reason: "从当前状态分叉一条验证线程。",
+      ephemeral: false,
+    }),
+    { params: Promise.resolve({ projectId: project.id }) },
+  );
+  const payload = await response.json();
+
+  assert.equal(response.status, 200);
+  assert.equal(payload.ok, true);
+  assert.equal(payload.task.intentCategory, "thread_fork");
+  assert.equal(payload.task.threadForkReason, "从当前状态分叉一条验证线程。");
+  assert.equal(payload.task.threadForkEphemeral, false);
+  assert.equal(payload.task.targetProjectId, project.id);
+  assert.equal(payload.task.targetCodexThreadRef, "codex-fork-source-thread");
+
+  const persisted = (await readState()).masterAgentTasks.find(
+    (task) => task.taskId === payload.task.taskId,
+  );
+  assert.equal(persisted?.status, "queued");
+  assert.equal(persisted?.intentCategory, "thread_fork");
+  assert.equal(persisted?.threadForkReason, "从当前状态分叉一条验证线程。");
+  assert.equal(persisted?.threadForkEphemeral, false);
+});