diff --git a/docs/reference/spec-v01-aipod-spec.md b/docs/reference/spec-v01-aipod-spec.md
index 9b758d2..e5e791b 100644
--- a/docs/reference/spec-v01-aipod-spec.md
+++ b/docs/reference/spec-v01-aipod-spec.md
@@ -97,7 +97,9 @@ imageRef:
   - UniDesk repo 提供 primary source workspace 与 `unidesk-*` skills；
   - AgentRun repo 提供 `tools/trans`、`tools/tran`、`tools/apply_patch` 等 runner tool shim；
   - `agent_skills` repo 提供 `dad-dev`、`cli-spec`、`docs-spec`、`git-spec`；
-  - `tools/tran` 只委派 primary UniDesk workspace 的 `scripts/tran`，Windows、host 与 k3s route 解析和 frontend transport 均由 UniDesk 共享实现负责；
+  - runner 通过 `AGENTRUN_WORKSPACE_PATH` 显式传递已物化的 primary workspace；
+  - `tools/tran` 只从该路径委派 primary UniDesk workspace 的 `scripts/tran`，不得根据安装 shim 的 `$0` 反推源码目录；
+  - Windows、host 与 k3s route 解析和 frontend transport 均由 UniDesk 共享实现负责；
   - runner 物化阶段自动把 GitHub URL 改写到 G14 git mirror，Artificer 规格本身不声明 mirror 开关或 mirror base URL。
 - primary source workspace 与受控远端 tool target 是不同边界：
   - Agent 修改的源码仍以 `ResourceBundleRef` 物化出的 primary workspace 为唯一来源；
diff --git a/docs/reference/spec-v01-runtime-assembly.md b/docs/reference/spec-v01-runtime-assembly.md
index a382064..1680089 100644
--- a/docs/reference/spec-v01-runtime-assembly.md
+++ b/docs/reference/spec-v01-runtime-assembly.md
@@ -206,10 +206,26 @@ runner 对 managed overlay 的逻辑 `tools/` 做统一装配：
 - 顶层带 shebang 的脚本会被 `chmod +x`，并通过 `PATH` 暴露；
 - runtime 配置 `AGENTRUN_RESOURCE_BIN_PATH` 时，只能在该目录写入执行原始 overlay tool 的 shim；
 - 禁止复制 tool 文件到 bin 目录后改变 `dirname "$0"`、相对 import 或辅助源码解析语义；
+- runner 必须通过 `AGENTRUN_WORKSPACE_PATH` 向 backend tool 显式传递已物化的 primary workspace；
+- runtime tool 不得根据安装 shim 的 `$0` 反推 primary workspace；
 - 非 shebang 文件只作为 bundle 源码、测试或辅助文件，不作为可执行工具发现；
 - 短命令名称来自 repo 内真实文件，例如 `tools/hwpod`，repo tool 本身承担业务 wrapper 语义。
 
-AgentRun 自身仓库必须提供 `tools/tran`、`tools/trans` 与 `tools/apply_patch`，用于承接 UniDesk frontend `/ws/ssh` 的 scoped client-token 透传。runner 只通过 `executionPolicy.secretScope.toolCredentials[]` 投影 `UNIDESK_SSH_CLIENT_TOKEN`，并通过调用方 `transientEnv` 或 manager 受控默认值注入非敏感 `UNIDESK_MAIN_SERVER_IP`、`UNIDESK_MAIN_SERVER_HOST` 或 `UNIDESK_FRONTEND_URL`；工具不得读取 provider token、主 server SSH key 或完整 frontend 登录态。`tran --help` 必须输出 JSON，并列出当前支持的最小开发面：host/host workspace `script`、`argv`、普通 ssh-like 命令、host workspace `apply-patch`、`k3s kubectl`、`k3s script`、k3s workload `argv/script` 和 k3s workload `apply-patch`。runner 侧 `apply-patch` 只把 stdin patch 和相邻 `tools/apply_patch` helper 传到目标 route 执行，不接触或回显 Secret 值；`upload`、`download` 和 Windows route 未实现时必须显式 `unsupported-operation`，不能静默改走不受控 shell 拼接或 token fallback。
+AgentRun 自身仓库必须提供 `tools/tran`、`tools/trans` 与 `tools/apply_patch`：
+
+- 这些工具用于承接 UniDesk frontend `/ws/ssh` 的 scoped client-token 透传；
+- runner 只通过 `executionPolicy.secretScope.toolCredentials[]` 投影 `UNIDESK_SSH_CLIENT_TOKEN`；
+- 非敏感 frontend 地址只由受控入口注入：
+  - 可用字段是 `UNIDESK_MAIN_SERVER_IP`、`UNIDESK_MAIN_SERVER_HOST` 或 `UNIDESK_FRONTEND_URL`；
+  - 注入来源是调用方 `transientEnv` 或 manager 受控默认值；
+- 工具不得读取 provider token、主 server SSH key 或完整 frontend 登录态；
+- `tools/tran` 只委派 `AGENTRUN_WORKSPACE_PATH` 指向的 primary UniDesk workspace 中的 `scripts/tran`；
+- route 与 transport 职责保持单一：
+  - Windows、host 与 k3s route 解析和 frontend transport 均由 UniDesk 共享实现负责；
+  - AgentRun 不维护第二套 parser 或 fallback；
+- runner 侧 `apply-patch` 保持最小职责：
+  - 只把 stdin patch 和相邻 `tools/apply_patch` helper 传到目标 route 执行；
+  - 不接触或回显 Secret 值。
 
 #### promptRefs
 
diff --git a/src/runner/run-once.ts b/src/runner/run-once.ts
index d19a1f3..cd66c10 100644
--- a/src/runner/run-once.ts
+++ b/src/runner/run-once.ts
@@ -226,7 +226,7 @@ function resourceMaterializationEnv(env: NodeJS.ProcessEnv, runId: string, attem
 
 function resourceEnvForMaterialized(env: NodeJS.ProcessEnv, materialized: Awaited<ReturnType<typeof materializeResourceBundle>>): NodeJS.ProcessEnv | undefined {
   if (!materialized) return undefined;
-  const sanitized = { ...env };
+  const sanitized = { ...env, AGENTRUN_WORKSPACE_PATH: materialized.workspacePath };
   delete sanitized.AGENTRUN_RESOURCE_CREDENTIAL_PATH;
   let next: NodeJS.ProcessEnv | undefined = sanitized;
   if (materialized.binPath) {
diff --git a/src/selftest/cases/50-hwlab-manual-dispatch.ts b/src/selftest/cases/50-hwlab-manual-dispatch.ts
index e5f554f..e06cfe6 100644
--- a/src/selftest/cases/50-hwlab-manual-dispatch.ts
+++ b/src/selftest/cases/50-hwlab-manual-dispatch.ts
@@ -196,6 +196,8 @@ process.exit(1);
     assert.equal(assemblyRunnerResult.commandsProcessed, 2);
     const assemblyInputs = (await readTextIfExists(assemblyInputFile)).trim().split("\n").filter(Boolean).map((line) => JSON.parse(line) as JsonRecord);
     assert.equal(assemblyInputs.length, 2);
+    assert.equal(assemblyInputs[0]?.workspacePath, assemblyInputs[0]?.cwd, "backend tool env must identify the materialized primary workspace explicitly");
+    assert.equal(assemblyInputs[1]?.workspacePath, assemblyInputs[1]?.cwd, "continued turns must preserve the primary workspace env contract");
     const firstAssemblyInput = turnInputText(assemblyInputs[0]);
     const secondAssemblyInput = turnInputText(assemblyInputs[1]);
     assert.match(firstAssemblyInput, /HWLAB v0\.2 runtime prompt self-test/u);
diff --git a/src/selftest/cases/90-runner-image-tools.ts b/src/selftest/cases/90-runner-image-tools.ts
index ba72fa6..3109ebd 100644
--- a/src/selftest/cases/90-runner-image-tools.ts
+++ b/src/selftest/cases/90-runner-image-tools.ts
@@ -31,12 +31,32 @@ const selfTest: SelfTestCase = async (context) => {
   assert.equal(applyPatch.startsWith("#!/bin/sh\n"), true, "tools/apply_patch must be a shebang helper copied with runner tools");
   assert.equal(agentrunGit.startsWith("#!/usr/bin/env bun\n"), true, "tools/agentrun-git must be a shebang executable discovered by gitbundle tools");
   assert.equal(tran.includes("scripts/tran"), true, "tools/tran must delegate to the primary UniDesk workspace implementation");
+  assert.equal(tran.includes("AGENTRUN_WORKSPACE_PATH"), true, "tools/tran must use the explicit primary workspace contract");
   assert.equal(tran.includes("UNIDESK_TRAN_REPO_ROOT"), true, "tools/tran must bind the shared implementation to the primary workspace");
+  assert.equal(tran.includes("dirname -- \"$0\""), false, "tools/tran must not infer the primary workspace from an installed shim path");
   assert.equal(tran.includes("parseRoute"), false, "tools/tran must not carry a second route parser");
   assert.equal(tran.includes("does not support Windows routes"), false, "tools/tran must not reject shared Windows routes");
   assert.equal(agentrunGit.includes("GIT_TERMINAL_PROMPT"), true, "tools/agentrun-git must disable interactive git prompts");
   assert.equal(agentrunGit.includes("AGENTRUN_GIT_DIRECT_HOSTS"), true, "tools/agentrun-git must expose direct host policy");
 
+  const primaryWorkspace = path.join(context.tmp, "tran-primary-workspace");
+  const primaryScripts = path.join(primaryWorkspace, "scripts");
+  await mkdir(primaryScripts, { recursive: true });
+  await writeFile(path.join(primaryScripts, "ssh-cli.ts"), "// UniDesk shared tran entrypoint\n", "utf8");
+  await writeFile(path.join(primaryScripts, "tran"), "#!/bin/sh\nprintf '%s\\n' \"$UNIDESK_TRAN_REPO_ROOT\" \"$*\"\n", "utf8");
+  await chmod(path.join(primaryScripts, "tran"), 0o755);
+  const installedBin = path.join(context.tmp, "installed-resource-bin");
+  await mkdir(installedBin, { recursive: true });
+  const installedTran = path.join(installedBin, "tran");
+  await writeFile(installedTran, `#!/bin/sh\nexec '${path.join(context.root, "tools/tran")}' \"$@\"\n`, "utf8");
+  await chmod(installedTran, 0o755);
+  const delegatedTran = await execFileAsync(installedTran, ["TEST:win", "cmd", "cd"], { cwd: context.tmp, env: { ...process.env, AGENTRUN_WORKSPACE_PATH: primaryWorkspace } });
+  assert.deepEqual(delegatedTran.stdout.trim().split("\n"), [primaryWorkspace, "TEST:win cmd cd"]);
+  await assert.rejects(
+    () => execFileAsync(installedTran, ["--help"], { cwd: context.tmp, env: { ...process.env, AGENTRUN_WORKSPACE_PATH: undefined } }),
+    (error) => error instanceof Error && "stderr" in error && String(error.stderr).includes("runner did not provide an absolute primary workspace path"),
+  );
+
   const patchHelp = await execFileAsync(path.join(context.root, "tools/apply_patch"), ["--help"], { cwd: context.root, timeout: 10_000 });
   assert.equal(patchHelp.stdout.includes("reads *** Begin Patch format"), true);
   const agentrunGitHelp = await execFileAsync(path.join(context.root, "tools/agentrun-git"), ["--help"], { cwd: context.root, timeout: 10_000 });
diff --git a/src/selftest/fake-codex-app-server.ts b/src/selftest/fake-codex-app-server.ts
index 2229ea5..b9432e1 100644
--- a/src/selftest/fake-codex-app-server.ts
+++ b/src/selftest/fake-codex-app-server.ts
@@ -75,7 +75,7 @@ for await (const line of rl) {
     continue;
   }
   if (message.method === "turn/start") {
-    if (process.env.AGENTRUN_FAKE_CODEX_TURN_INPUT_FILE) appendFileSync(process.env.AGENTRUN_FAKE_CODEX_TURN_INPUT_FILE, `${JSON.stringify({ threadId: message.params?.threadId ?? null, input: message.params?.input ?? null, model: message.params?.model ?? null, effort: message.params?.effort ?? null })}\n`);
+    if (process.env.AGENTRUN_FAKE_CODEX_TURN_INPUT_FILE) appendFileSync(process.env.AGENTRUN_FAKE_CODEX_TURN_INPUT_FILE, `${JSON.stringify({ threadId: message.params?.threadId ?? null, input: message.params?.input ?? null, model: message.params?.model ?? null, effort: message.params?.effort ?? null, workspacePath: process.env.AGENTRUN_WORKSPACE_PATH ?? null, cwd: process.cwd() })}\n`);
     if (mode === "reject-unexpected-model" && (observedThreadModel || Object.hasOwn(message.params ?? {}, "model"))) {
       respond(message.id, null, { code: -32000, message: "turn/start unexpectedly included model" });
       continue;
diff --git a/tools/tran b/tools/tran
index dc0fd7e..2ebc6bb 100755
--- a/tools/tran
+++ b/tools/tran
@@ -1,11 +1,20 @@
 #!/bin/sh
 set -eu
 
-self_dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
-primary_workspace=$(CDPATH= cd -- "$self_dir/../../.." && pwd)
-shared_tran="$primary_workspace/scripts/tran"
+primary_workspace=${AGENTRUN_WORKSPACE_PATH:-}
 
-if [ ! -x "$shared_tran" ]; then
+case "$primary_workspace" in
+  /*) ;;
+  *)
+    printf '%s\n' '{"ok":false,"failureKind":"tool-unavailable","message":"runner did not provide an absolute primary workspace path","source":"primary-workspace","valuesPrinted":false}' >&2
+    exit 2
+    ;;
+esac
+
+shared_tran="$primary_workspace/scripts/tran"
+shared_cli="$primary_workspace/scripts/ssh-cli.ts"
+
+if [ ! -x "$shared_tran" ] || [ ! -f "$shared_cli" ]; then
   printf '%s\n' '{"ok":false,"failureKind":"tool-unavailable","message":"primary UniDesk workspace does not provide executable scripts/tran","source":"primary-workspace","valuesPrinted":false}' >&2
   exit 2
 fi