diff --git a/.worktreecopy b/.worktreecopy
new file mode 100644
index 00000000..11ec4c04
--- /dev/null
+++ b/.worktreecopy
@@ -0,0 +1,9 @@
+# Local runtime hints copied by `bun scripts/cli.ts dev-env worktree add`.
+# Keep this file to path patterns only; never store secret values here.
+.env/trans.ymal
+.env/*.local.yaml
+.env/*.local.yml
+.env/*.local.json
+config/*.local.yaml
+config/*.local.yml
+config/*.local.json
diff --git a/docs/reference/dev-environment.md b/docs/reference/dev-environment.md
index c2048724..4d18807c 100644
--- a/docs/reference/dev-environment.md
+++ b/docs/reference/dev-environment.md
@@ -25,7 +25,7 @@ trans D601:/home/ubuntu/workspace/unidesk-dev git remote -v
 
 若路径、分支或 remote 不符合预期，先修正 fixed workspace，再继续。`/home/ubuntu/cq-deploy`、Code Queue pod 内 `/root/unidesk`/`/app`、D601 上的 `/root/unidesk` 和 `/tmp/unidesk-*` 只作为部署副本、运行副本或临时实验面；运行面热修可以直接作用在 pod/容器，但必须随后把持久化修复提交到 Git remote，并在 fixed workspace 中复验。
 
-固定 workspace 只作为 source truth 预检、fetch、worktree 管理和最终同步入口。实际开发、文档修改、测试补丁和 PR 准备应在固定 repo 下的独立 worktree 中完成，例如 `/home/ubuntu/workspace/unidesk-dev/.worktree/<task>`；该 worktree 必须从最新 `origin/master` 创建，使用任务专属分支或 detached worktree 隔离当前改动，结束前用 `git status` 确认只包含本任务文件。不要把 `/home/ubuntu/workspace/unidesk-dev` 根目录当作并行任务 scratch 区，也不要复用其他任务遗留 worktree。
+固定 workspace 只作为 source truth 预检、fetch、受控 worktree 创建和最终同步入口。实际开发、文档修改、测试补丁和 PR 准备应在固定 repo 下的独立 worktree 中完成，例如 `/home/ubuntu/workspace/unidesk-dev/.worktree/<task>`；该 worktree 必须通过 `bun scripts/cli.ts dev-env worktree add .worktree/<task> --branch <branch> --from origin/master` 从最新 `origin/master` 创建，让 `.worktreecopy` 中声明的本地配置白名单自动复制到新 worktree。使用任务专属分支或 detached worktree 隔离当前改动，结束前用 `git status` 确认只包含本任务文件。不要把 `/home/ubuntu/workspace/unidesk-dev` 根目录当作并行任务 scratch 区，也不要复用其他任务遗留 worktree。
 
 Master server 不作为 UniDesk 重型验证机。仓库级 check、Playwright/browser smoke、镜像构建、Rust/Go 编译和 Code Queue runner 实测必须放到 D601、CI runner 或其他获批执行面；master server 只做轻量源码编辑、Git 操作、状态观察和受控调度。唯一例外是 backend-core 主 server 上线：当用户或 issue 明确要求把当前 backend-core 修复上线到主 server 时，可以用 `CARGO_BUILD_JOBS=1`、`--jobs 1` 或 CLI 内置等价限流执行 backend-core 专属编译，并必须用异步 job/status/health 证据回写 issue。
 
@@ -115,7 +115,7 @@ The persistent dev environment follows the shared Git-backed deployment hygiene
 
 Use this sequence for backend-core Rust and frontend dev work:
 
-1. Preflight the fixed workspace, then develop in a task-scoped `.worktree/<task>` created from the latest `origin/master`; keep unrelated parallel changes separated with `git status`/`git diff`.
+1. Preflight the fixed workspace, then create the task-scoped worktree with `bun scripts/cli.ts dev-env worktree add .worktree/<task> --branch <branch> --from origin/master`; keep unrelated parallel changes separated with `git status`/`git diff`.
 2. Run local non-Rust checks on the master server, for example `bun scripts/cli.ts check --files --scripts-typecheck --compose --logs`.
 3. Commit the code from the task worktree and merge/push it to `origin/master` through the chosen lightweight PR or direct integration path; `deploy apply --env dev` cannot deploy unpushed local changes.
 4. Update `deploy.json` `environments.dev.services` so `backend-core` and `frontend` point at the pushed commit, then commit and push that manifest update.
diff --git a/docs/reference/devops-hygiene.md b/docs/reference/devops-hygiene.md
index 40ecbb3b..e24d1309 100644
--- a/docs/reference/devops-hygiene.md
+++ b/docs/reference/devops-hygiene.md
@@ -50,13 +50,13 @@ If a manual repair is needed to unblock the platform, the durable fix must be co
 
 “分布式敏捷”是 UniDesk 对 distributed agile field repair 的固定流程名；通用 P1/P2/P3/P4 阶段、禁止行为和证据边界由 `$dad-dev` skill 维护，本参考不再重复展开。UniDesk 项目内只保留下面的特有约束：必须使用结构化 `trans`/UniDesk CLI 进入真实 provider、pod、host bridge 或 service port；运行面热补只能证明方向或临时恢复，不能成为隐藏部署真相；持久化完成必须回到 Git/PR/CI/CD 后原入口复测。
 
-固定主 repo 是 source truth anchor，不是源码/运行面 scratch 区。会产生源码、配置、issue closeout、部署脚本、验收产物或高风险 dad-dev / post-task 交付的工作，执行前必须先从目标 fixed repo 的最新 remote/base 创建任务专属 `.worktree/<task>`，后续编辑、验证、提交、push 和受控 CLI 写操作都在该 worktree 内完成。fixed repo 只用于 `git fetch`、`git status`、快进同步、读取规则和 `git worktree add`；其中已有的并行未提交修改默认保持不动，不纳入当前任务，也不要用 reset、checkout 或删除来“清理”。
+固定主 repo 是 source truth anchor，不是源码/运行面 scratch 区。会产生源码、配置、issue closeout、部署脚本、验收产物或高风险 dad-dev / post-task 交付的工作，执行前必须先从目标 fixed repo 的最新 remote/base 创建任务专属 `.worktree/<task>`，后续编辑、验证、提交、push 和受控 CLI 写操作都在该 worktree 内完成。UniDesk 任务 worktree 必须通过 `bun scripts/cli.ts dev-env worktree add .worktree/<task> --branch <branch> [--from origin/master]` 创建，让 `.worktreecopy` 白名单内的本地配置自动复制到新 worktree；fixed repo 只用于 `git fetch`、`git status`、快进同步、读取规则和这个受控创建入口。其中已有的并行未提交修改默认保持不动，不纳入当前任务，也不要用 reset、checkout 或删除来“清理”。
 
 开始使用任何固定主/目标 worktree 时，如果发现它落后 remote/base，必须先完成 source-truth 同步再继续分析或创建任务 worktree：若工作区有脏改，先用 `git stash push -u` 保存当前脏改（包括 untracked），再执行 `git pull --ff-only <remote> <branch>` 快进，随后 `git stash apply` 并按快进后的语义合并冲突或重复内容；若工作区 clean，则直接 `git pull --ff-only`。这个 stash 是保护并行修改以便固定主 repo 回到最新 source truth，不是清理、丢弃或隐式接管并行任务；apply 后只提交当前任务明确相关的文件，其他并行修改继续保留原状。不得在落后的固定 worktree 上继续源码分析、创建任务分支、修改代码或给 issue 写基于旧源码的结论。
 
 固定 worktree 对齐 remote 是硬前置，不是建议项。`git status` clean、运行面 healthy、CI/CD snapshot 对齐或历史 PipelineRun 通过，都不能替代固定工作区自身的 remote/base 对齐检查；只要 HEAD 与声明 remote/base 不一致、`remoteUpToDate=false`、ahead/behind/diverged 或受控 source-workspace 状态返回 not-ready，就必须先修复固定工作区或改用从最新 remote/base 创建的干净 anchor。禁止从未对齐的固定 worktree 创建任务 worktree、开测试 PR、运行 repo 内验证或写 closeout 结论。
 
-所有源码、配置、部署脚本和运行面修复都必须在从最新 remote/base 创建的独立 `.worktree/<task>` 中完成；固定主 worktree 不直接承载代码修改。PR 合并或等价集成进入 remote base 后，应及时回到对应固定主 worktree 执行 `git fetch` 与 `git pull --ff-only`，让下一轮 source-truth 预检、web-probe 复核、issue closeout 和新任务 worktree 都从已合并的最新源码开始。若固定主 worktree 因并行脏改不能安全快进，保留脏改并改用干净的最新 remote/base worktree 继续，不能 reset、checkout 或删除他人修改。
+所有源码、配置、部署脚本和运行面修复都必须在从最新 remote/base 创建的独立 `.worktree/<task>` 中完成；固定主 worktree 不直接承载代码修改。`.worktreecopy` 只能声明可复制的本地文件路径模式，支持空行、注释、glob 和 `!pattern` 排除/重包含语义，不得写入 secret 值；复制结果默认不覆盖目标文件，只有显式 `--overwrite-local` 才允许覆盖。PR 合并或等价集成进入 remote base 后，应及时回到对应固定主 worktree 执行 `git fetch` 与 `git pull --ff-only`，让下一轮 source-truth 预检、web-probe 复核、issue closeout 和新任务 worktree 都从已合并的最新源码开始。若固定主 worktree 因并行脏改不能安全快进，保留脏改并改用干净的最新 remote/base worktree 继续，不能 reset、checkout 或删除他人修改。
 
 任务 worktree 清理前必须做语义合并核查。最低要求是：worktree clean；相关提交已经是 `origin/master` 祖先，或 `git log --left-right --cherry-pick <worktree-head>...origin/master` 没有 left-only 未吸收 patch；必要时再核对关键文件 diff、PR merge commit、issue closeout 和运行面验证是否对应最新 `master`。只有确认当前任务语义已经进入 `master` 或被更新实现等价替代后，才允许 `git worktree remove <path>`；不得只因为分支落后、PR 已关闭、文件看起来相似或本地空间紧张就删除。若发现未提交文件、未推送提交、left-only patch 或语义不确定，先把应保留内容提交/合并/推送到 `master`，或记录阻塞并保留 worktree。
 
diff --git a/scripts/cli.ts b/scripts/cli.ts
index a13ef752..107f2f88 100644
--- a/scripts/cli.ts
+++ b/scripts/cli.ts
@@ -326,6 +326,11 @@ async function main(): Promise<void> {
   if (top === "dev-env") {
     const result = runDevEnvCommand(args.slice(1));
     const ok = (result as { ok?: unknown }).ok !== false;
+    if (isRenderedCliResult(result)) {
+      emitText(result.renderedText, result.command || commandName);
+      if (!ok) process.exitCode = 1;
+      return;
+    }
     emitJson(commandName, result, ok);
     if (!ok) process.exitCode = 1;
     return;
diff --git a/scripts/src/dev-env.ts b/scripts/src/dev-env.ts
index d61c1511..6f9086a2 100644
--- a/scripts/src/dev-env.ts
+++ b/scripts/src/dev-env.ts
@@ -1,4 +1,5 @@
-import { readFileSync } from "node:fs";
+import { copyFileSync, existsSync, mkdirSync, readFileSync, readdirSync, statSync } from "node:fs";
+import { dirname, isAbsolute, relative, resolve, sep } from "node:path";
 import { runCommand } from "./command";
 import { repoRoot, rootPath } from "./config";
 import { k3sGuardShellLines, defaultNativeKubeconfig } from "./k3s-target-guard";
@@ -13,6 +14,20 @@ const defaultPrewarmImages = [
   "postgres:16-alpine",
   "rancher/mirrored-library-busybox:1.36.1",
 ];
+const defaultWorktreeCopyFile = ".worktreecopy";
+const defaultWorktreeFromRef = "origin/master";
+const maxWorktreeCopyBytes = 1024 * 1024;
+const refusedWorktreeCopyPrefixes = [
+  ".git/",
+  ".worktree/",
+  "node_modules/",
+  "dist/",
+  "build/",
+  "coverage/",
+  ".state/",
+  "tmp/",
+  ".tmp/",
+];
 const foundationRequiredKinds = new Set([
   "Namespace/unidesk-dev",
   "Secret/unidesk-dev-runtime-secrets",
@@ -71,6 +86,29 @@ interface PrewarmImagesOptions {
   dryRun: boolean;
 }
 
+interface WorktreeAddOptions {
+  targetPath: string;
+  branch: string | null;
+  fromRef: string;
+  copyLocal: boolean;
+  overwriteLocal: boolean;
+  dryRun: boolean;
+  json: boolean;
+}
+
+interface WorktreeCopyPattern {
+  raw: string;
+  pattern: string;
+  include: boolean;
+}
+
+interface WorktreeCopyRow {
+  path: string;
+  status: "copied" | "skipped" | "refused";
+  reason: string;
+  bytes: number | null;
+}
+
 function isHelpArg(arg: string | undefined): boolean {
   return arg === "help" || arg === "--help" || arg === "-h";
 }
@@ -148,6 +186,53 @@ function parsePrewarmImagesOptions(args: string[]): PrewarmImagesOptions {
   return options;
 }
 
+function parseWorktreeAddOptions(args: string[]): WorktreeAddOptions {
+  const positional: string[] = [];
+  const options: WorktreeAddOptions = {
+    targetPath: "",
+    branch: null,
+    fromRef: defaultWorktreeFromRef,
+    copyLocal: true,
+    overwriteLocal: false,
+    dryRun: false,
+    json: false,
+  };
+  for (let index = 0; index < args.length; index += 1) {
+    const arg = args[index];
+    if (arg === "--branch" || arg === "-b") {
+      const value = args[index + 1];
+      if (value === undefined || value.length === 0) throw new Error("--branch requires a branch name");
+      rejectUnsafeToken(value, "--branch");
+      options.branch = value;
+      index += 1;
+    } else if (arg === "--from") {
+      const value = args[index + 1];
+      if (value === undefined || value.length === 0) throw new Error("--from requires a git ref");
+      rejectUnsafeToken(value, "--from");
+      options.fromRef = value;
+      index += 1;
+    } else if (arg === "--copy-local") {
+      options.copyLocal = true;
+    } else if (arg === "--no-copy-local") {
+      options.copyLocal = false;
+    } else if (arg === "--overwrite-local") {
+      options.overwriteLocal = true;
+    } else if (arg === "--dry-run") {
+      options.dryRun = true;
+    } else if (arg === "--json") {
+      options.json = true;
+    } else if (!isHelpArg(arg)) {
+      if (arg.startsWith("-")) throw new Error(`unknown dev-env worktree add option: ${arg}`);
+      positional.push(arg);
+    }
+  }
+  if (positional.length !== 1) throw new Error("dev-env worktree add usage: bun scripts/cli.ts dev-env worktree add .worktree/<task> --branch <branch> [--from origin/master]");
+  options.targetPath = positional[0] ?? "";
+  rejectUnsafeToken(options.targetPath, "worktree path");
+  if (options.overwriteLocal) options.copyLocal = true;
+  return options;
+}
+
 function scalarAfter(text: string, key: string): string | null {
   const match = text.match(new RegExp(`^\\s*${key}:\\s*"?([^"\\n#]+)"?\\s*(?:#.*)?$`, "mu"));
   return match?.[1]?.trim() ?? null;
@@ -216,6 +301,174 @@ function validateDatabaseUrl(url: string): { ok: boolean; url: string; reason: s
   return { ok: true, url, reason: null };
 }
 
+function normalizedRelativePath(path: string): string {
+  return path.split(sep).join("/");
+}
+
+function resolveWorktreeTarget(targetPath: string): { absolutePath: string; displayPath: string } {
+  const absolutePath = isAbsolute(targetPath) ? resolve(targetPath) : resolve(repoRoot, targetPath);
+  const repoRelative = relative(repoRoot, absolutePath);
+  if (repoRelative.length === 0) throw new Error("worktree path must not be the repository root");
+  if (repoRelative.startsWith("..") || isAbsolute(repoRelative)) throw new Error("worktree path must stay under the UniDesk repository root");
+  const displayPath = normalizedRelativePath(repoRelative);
+  if (displayPath === ".git" || displayPath.startsWith(".git/")) throw new Error("worktree path must not be inside .git");
+  if (displayPath.split("/").some((part) => part.length === 0 || part === "." || part === "..")) throw new Error("worktree path must be normalized");
+  return { absolutePath, displayPath };
+}
+
+function parseWorktreeCopyPatterns(text: string): WorktreeCopyPattern[] {
+  return text.split(/\r?\n/u)
+    .map((line) => line.trim())
+    .filter((line) => line.length > 0 && !line.startsWith("#"))
+    .map((line) => {
+      const include = !line.startsWith("!");
+      const pattern = include ? line : line.slice(1);
+      if (pattern.length === 0 || pattern.startsWith("/") || pattern.includes("\\") || pattern.split("/").some((part) => part === "..")) {
+        throw new Error(`${defaultWorktreeCopyFile} contains unsupported pattern: ${line}`);
+      }
+      return { raw: line, pattern, include };
+    });
+}
+
+function escapeRegExp(value: string): string {
+  return value.replace(/[|\\{}()[\]^$+?.]/gu, "\\$&");
+}
+
+function globToRegExp(pattern: string): RegExp {
+  let source = "^";
+  for (let index = 0; index < pattern.length; index += 1) {
+    const char = pattern[index] ?? "";
+    const next = pattern[index + 1] ?? "";
+    if (char === "*" && next === "*") {
+      source += ".*";
+      index += 1;
+    } else if (char === "*") {
+      source += "[^/]*";
+    } else if (char === "?") {
+      source += "[^/]";
+    } else {
+      source += escapeRegExp(char);
+    }
+  }
+  return new RegExp(`${source}$`, "u");
+}
+
+function patternPrefix(pattern: string): string {
+  const wildcardIndex = pattern.search(/[*?]/u);
+  const prefix = wildcardIndex < 0 ? pattern : pattern.slice(0, wildcardIndex);
+  const slashIndex = prefix.lastIndexOf("/");
+  return slashIndex < 0 ? "" : prefix.slice(0, slashIndex);
+}
+
+function walkFiles(root: string, relativeRoot: string, out: string[]): void {
+  if (!existsSync(root)) return;
+  const stat = statSync(root);
+  if (stat.isFile()) {
+    out.push(relativeRoot);
+    return;
+  }
+  if (!stat.isDirectory()) return;
+  for (const entry of readdirSync(root, { withFileTypes: true })) {
+    if (entry.name === ".git" || entry.name === "node_modules") continue;
+    const childRelative = relativeRoot.length === 0 ? entry.name : `${relativeRoot}/${entry.name}`;
+    const childPath = resolve(root, entry.name);
+    if (entry.isDirectory()) walkFiles(childPath, childRelative, out);
+    else if (entry.isFile()) out.push(childRelative);
+  }
+}
+
+function candidateWorktreeCopyFiles(patterns: WorktreeCopyPattern[]): Set<string> {
+  const candidates = new Set<string>();
+  for (const pattern of patterns.filter((entry) => entry.include)) {
+    if (!pattern.pattern.includes("*") && !pattern.pattern.includes("?")) {
+      candidates.add(pattern.pattern);
+      continue;
+    }
+    const prefix = patternPrefix(pattern.pattern);
+    const files: string[] = [];
+    walkFiles(resolve(repoRoot, prefix), prefix, files);
+    const matcher = globToRegExp(pattern.pattern);
+    for (const file of files) {
+      if (matcher.test(file)) candidates.add(file);
+    }
+  }
+  return candidates;
+}
+
+function includedByPatterns(path: string, patterns: WorktreeCopyPattern[]): boolean {
+  let included = false;
+  for (const pattern of patterns) {
+    if (globToRegExp(pattern.pattern).test(path)) included = pattern.include;
+  }
+  return included;
+}
+
+function copyRefusalReason(path: string, bytes: number): string | null {
+  const withSlash = path.endsWith("/") ? path : `${path}/`;
+  if (refusedWorktreeCopyPrefixes.some((prefix) => path === prefix.slice(0, -1) || withSlash.startsWith(prefix))) return "refused-runtime-or-build-path";
+  if (path.toLowerCase().includes("dump")) return "refused-dump-path";
+  if (bytes > maxWorktreeCopyBytes) return `refused-large-file>${maxWorktreeCopyBytes}`;
+  return null;
+}
+
+function copyWorktreeLocalFiles(targetAbsolutePath: string, overwriteLocal: boolean, dryRun = false): { configPath: string; patterns: string[]; rows: WorktreeCopyRow[] } {
+  const configPath = resolve(repoRoot, defaultWorktreeCopyFile);
+  if (!existsSync(configPath)) {
+    return {
+      configPath: defaultWorktreeCopyFile,
+      patterns: [],
+      rows: [{ path: defaultWorktreeCopyFile, status: "skipped", reason: "copy-config-missing", bytes: null }],
+    };
+  }
+  const patterns = parseWorktreeCopyPatterns(readFileSync(configPath, "utf8"));
+  const rows: WorktreeCopyRow[] = [];
+  for (const candidate of Array.from(candidateWorktreeCopyFiles(patterns)).sort()) {
+    if (!includedByPatterns(candidate, patterns)) continue;
+    const sourcePath = resolve(repoRoot, candidate);
+    const sourceRelative = normalizedRelativePath(relative(repoRoot, sourcePath));
+    if (sourceRelative !== candidate || sourceRelative.startsWith("..")) {
+      rows.push({ path: candidate, status: "refused", reason: "refused-outside-repo", bytes: null });
+      continue;
+    }
+    if (!existsSync(sourcePath)) {
+      rows.push({ path: candidate, status: "skipped", reason: "source-missing", bytes: null });
+      continue;
+    }
+    const stat = statSync(sourcePath);
+    if (!stat.isFile()) {
+      rows.push({ path: candidate, status: "skipped", reason: "not-a-file", bytes: null });
+      continue;
+    }
+    const refusalReason = copyRefusalReason(candidate, stat.size);
+    if (refusalReason !== null) {
+      rows.push({ path: candidate, status: "refused", reason: refusalReason, bytes: stat.size });
+      continue;
+    }
+    const targetPath = resolve(targetAbsolutePath, candidate);
+    const targetRelative = normalizedRelativePath(relative(targetAbsolutePath, targetPath));
+    if (targetRelative !== candidate || targetRelative.startsWith("..")) {
+      rows.push({ path: candidate, status: "refused", reason: "refused-target-outside-worktree", bytes: stat.size });
+      continue;
+    }
+    if (existsSync(targetPath) && !overwriteLocal) {
+      rows.push({ path: candidate, status: "skipped", reason: "target-exists", bytes: stat.size });
+      continue;
+    }
+    if (dryRun) {
+      rows.push({ path: candidate, status: "skipped", reason: existsSync(targetPath) ? "would-overwrite" : "would-copy", bytes: stat.size });
+    } else {
+      mkdirSync(dirname(targetPath), { recursive: true, mode: 0o700 });
+      copyFileSync(sourcePath, targetPath);
+      rows.push({ path: candidate, status: "copied", reason: overwriteLocal ? "overwritten" : "created", bytes: stat.size });
+    }
+  }
+  return {
+    configPath: defaultWorktreeCopyFile,
+    patterns: patterns.map((pattern) => pattern.raw),
+    rows,
+  };
+}
+
 function kubectlDryRun(manifestPath: string): unknown {
   const kubeconfig = defaultNativeKubeconfig;
   const guardScript = k3sGuardShellLines(kubeconfig).join("\n");
@@ -321,6 +574,90 @@ function prewarmImagesScript(options: PrewarmImagesOptions): string {
   ].join("\n");
 }
 
+function worktreeAddCommand(options: WorktreeAddOptions, targetAbsolutePath: string): string[] {
+  const command = ["git", "worktree", "add"];
+  if (options.branch !== null) command.push("-b", options.branch);
+  command.push(targetAbsolutePath, options.fromRef);
+  return command;
+}
+
+function runWorktreeAdd(options: WorktreeAddOptions): unknown {
+  const target = resolveWorktreeTarget(options.targetPath);
+  if (existsSync(target.absolutePath) && !options.dryRun) throw new Error(`worktree target already exists: ${target.displayPath}`);
+  const command = worktreeAddCommand(options, target.absolutePath);
+  const result = {
+    ok: true,
+    dryRun: options.dryRun,
+    path: target.displayPath,
+    branch: options.branch,
+    fromRef: options.fromRef,
+    command,
+    copyLocal: options.copyLocal
+      ? copyWorktreeLocalFiles(target.absolutePath, options.overwriteLocal, true)
+      : { configPath: defaultWorktreeCopyFile, patterns: [], rows: [{ path: defaultWorktreeCopyFile, status: "skipped" as const, reason: "copy-local-disabled", bytes: null }] },
+  };
+  if (!options.dryRun) {
+    const git = runCommand(command, repoRoot, { timeoutMs: 120_000 });
+    if (git.exitCode !== 0) {
+      throw new Error(`git worktree add failed: ${JSON.stringify({
+        command: git.command,
+        exitCode: git.exitCode,
+        signal: git.signal,
+        timedOut: git.timedOut,
+        stdoutTail: git.stdout.slice(-2000),
+        stderrTail: git.stderr.slice(-2000),
+      })}`);
+    }
+    if (options.copyLocal) result.copyLocal = copyWorktreeLocalFiles(target.absolutePath, options.overwriteLocal);
+  }
+  if (options.json) return result;
+  return {
+    ok: true,
+    command: "dev-env worktree add",
+    contentType: "text/plain",
+    renderedText: renderWorktreeAdd(result),
+  };
+}
+
+function renderWorktreeAdd(result: {
+  ok: boolean;
+  dryRun: boolean;
+  path: string;
+  branch: string | null;
+  fromRef: string;
+  command: string[];
+  copyLocal: { configPath: string; patterns: string[]; rows: WorktreeCopyRow[] };
+}): string {
+  const rows = result.copyLocal.rows;
+  const counts = {
+    copied: rows.filter((row) => row.status === "copied").length,
+    skipped: rows.filter((row) => row.status === "skipped").length,
+    refused: rows.filter((row) => row.status === "refused").length,
+  };
+  const pathWidth = Math.min(60, Math.max(4, ...rows.map((row) => row.path.length)));
+  const statusWidth = Math.max(6, ...rows.map((row) => row.status.length));
+  const reasonWidth = Math.min(38, Math.max(6, ...rows.map((row) => row.reason.length)));
+  const truncate = (value: string, width: number): string => value.length <= width ? value : `${value.slice(0, Math.max(0, width - 1))}~`;
+  const lines = [
+    `worktree ${result.dryRun ? "dry-run" : "created"}: ${result.path}`,
+    `from: ${result.fromRef}${result.branch === null ? "" : `  branch: ${result.branch}`}`,
+    `copy config: ${result.copyLocal.configPath}  copied=${counts.copied} skipped=${counts.skipped} refused=${counts.refused}`,
+    "",
+    `${"STATUS".padEnd(statusWidth)}  ${"PATH".padEnd(pathWidth)}  ${"BYTES".padStart(8)}  REASON`,
+  ];
+  for (const row of rows) {
+    lines.push([
+      row.status.toUpperCase().padEnd(statusWidth),
+      truncate(row.path, pathWidth).padEnd(pathWidth),
+      (row.bytes === null ? "-" : String(row.bytes)).padStart(8),
+      truncate(row.reason, reasonWidth),
+    ].join("  "));
+  }
+  lines.push("");
+  lines.push(`drill down: bun scripts/cli.ts dev-env worktree add ${result.path} --from ${result.fromRef}${result.branch === null ? "" : ` --branch ${result.branch}`} --json`);
+  return lines.join("\n");
+}
+
 function devEnvHelp(): Record<string, unknown> {
   return {
     ok: true,
@@ -328,6 +665,7 @@ function devEnvHelp(): Record<string, unknown> {
     usage: [
       "bun scripts/cli.ts dev-env validate [--manifest path] [--kubectl-dry-run]",
       "bun scripts/cli.ts dev-env prewarm-images [--image image] [--provider-id D601] [--no-pull] [--proxy-url URL] [--pull-timeout-ms N] [--dry-run]",
+      "bun scripts/cli.ts dev-env worktree add .worktree/<task> --branch <branch> [--from origin/master] [--copy-local] [--overwrite-local] [--json]",
     ],
     defaultManifest,
     defaultPrewarmImages,
@@ -338,6 +676,7 @@ function devEnvHelp(): Record<string, unknown> {
       "dev DATABASE_URL values must target postgres-dev/unidesk_dev and not production routes",
       "--kubectl-dry-run optionally asks kubectl to client-dry-run the manifest without applying it",
       "prewarm-images imports dev foundation images from Docker into native k3s containerd on D601",
+      "worktree add creates UniDesk task worktrees and copies local files allowed by .worktreecopy",
     ],
   };
 }
@@ -345,6 +684,12 @@ function devEnvHelp(): Record<string, unknown> {
 export function runDevEnvCommand(args: string[]): unknown {
   const action = args[0];
   if (action === undefined || isHelpArg(action)) return devEnvHelp();
+  if (action === "worktree") {
+    const subaction = args[1];
+    if (subaction === undefined || isHelpArg(subaction)) return devEnvHelp();
+    if (subaction !== "add") throw new Error("dev-env worktree usage: bun scripts/cli.ts dev-env worktree add .worktree/<task> --branch <branch> [--from origin/master]");
+    return runWorktreeAdd(parseWorktreeAddOptions(args.slice(2)));
+  }
   if (action === "prewarm-images") {
     const options = parsePrewarmImagesOptions(args.slice(1));
     const script = prewarmImagesScript(options);
@@ -373,7 +718,7 @@ export function runDevEnvCommand(args: string[]): unknown {
       statusCommand: `bun scripts/cli.ts job status ${job.id} --tail-bytes 12000`,
     };
   }
-  if (action !== "validate") throw new Error("dev-env usage: bun scripts/cli.ts dev-env validate [--manifest path] [--kubectl-dry-run] OR dev-env prewarm-images");
+  if (action !== "validate") throw new Error("dev-env usage: bun scripts/cli.ts dev-env validate [--manifest path] [--kubectl-dry-run] OR dev-env prewarm-images OR dev-env worktree add");
 
   const options = parseValidateOptions(args.slice(1));
   const manifestPath = rootPath(options.manifestPath);
diff --git a/scripts/src/help.ts b/scripts/src/help.ts
index 160d74eb..35ca0350 100644
--- a/scripts/src/help.ts
+++ b/scripts/src/help.ts
@@ -61,7 +61,7 @@ export function rootHelp(): unknown {
       { command: "cicd status --node <NODE>", description: "Show one node's CI/CD closeout summary across current Pipelines-as-Code consumers, including PipelineRun, Argo and runtime readiness." },
       { command: "cicd gitea-actions-poc plan|status", description: "Archived read-only CI/CD migration evidence for GH-1548/GH-1549; never use as a delivery or closeout path." },
       { command: "cicd branch-follower status|events|logs", description: "Archived migration diagnostics only; PaC-migrated NC01 lane must use cicd status and platform-infra pipelines-as-code closeout/status/history." },
-      { command: "dev-env validate|prewarm-images", description: "Validate D601 unidesk-dev guardrails or prewarm dev foundation images into native k3s containerd through a bounded async job." },
+      { command: "dev-env validate|prewarm-images|worktree add", description: "Validate D601 guardrails, prewarm dev images, or create UniDesk task worktrees with .worktreecopy local config copying." },
       { command: "artifact-registry plan|render|status|health|install|deploy-backend-core|deploy-service", description: "Manage the D601 host-managed CNCF Distribution registry and run pull-only artifact CD for supported services, including D601 direct, k3s-managed, and code-queue dev-only consumers." },
       { command: "auth-broker contract|health --dry-run|credential-request --dry-run|pr-preflight --dry-run", description: "Inspect the P0 Rust auth broker and CLI adapter contract without reading token values, writing GitHub, or starting services." },
       { command: "gh preflight|auth|issue|pr", description: "Run safe GitHub issue and PR CRUD/lifecycle operations through REST with body-file update replace/append, issue/comment apply_patch body patching, comment delete, token diagnostics, PR closeout preflight, hard delete unsupported, and guarded PR merge." },
@@ -580,13 +580,14 @@ function e2eHelp(): unknown {
 
 function devEnvHelp(): unknown {
   return {
-    command: "dev-env validate|prewarm-images",
+    command: "dev-env validate|prewarm-images|worktree add",
     output: "json",
     usage: [
       "bun scripts/cli.ts dev-env validate [--manifest path] [--kubectl-dry-run]",
       "bun scripts/cli.ts dev-env prewarm-images [--image image] [--provider-id D601] [--no-pull] [--dry-run]",
+      "bun scripts/cli.ts dev-env worktree add .worktree/<task> --branch <branch> [--from origin/master] [--copy-local] [--overwrite-local] [--json]",
     ],
-    description: "Validate D601 unidesk-dev guardrails or prewarm foundation images into native k3s containerd.",
+    description: "Validate D601 unidesk-dev guardrails, prewarm foundation images, or create task worktrees with allowlisted local config copying.",
   };
 }