diff --git a/docs/plugins/sdk-subpaths.md b/docs/plugins/sdk-subpaths.md
index 1e838d43ceb2..35997fb1502d 100644
--- a/docs/plugins/sdk-subpaths.md
+++ b/docs/plugins/sdk-subpaths.md
@@ -390,7 +390,7 @@ Use `isLoopbackHost(host)` when a plugin must accept only the local machine. It
     | `plugin-sdk/tool-results` | Typed text and JSON agent tool result builders |
     | `plugin-sdk/tool-send` | Extract canonical send target fields from tool args |
     | `plugin-sdk/sandbox` | Private-local after July 2026; Sandbox backend types and SSH/OpenShell command helpers, including fail-fast exec command preflight and `resolveReadOnlyWorkspaceSkillMounts` for canonical read-only skill overlays in writable workspaces |
-    | `plugin-sdk/temp-path` | Shared temp-download path helpers and private secure temp workspaces |
+    | `plugin-sdk/temp-path` | Shared temp-download path helpers and private secure temp workspaces. `buildRandomTempFilePath` retains relative `tmpDir` paths and trims an optional `uuid`; blank values generate a UUID, while nonblank values must be safe filename components. `sanitizeTempFileName` adds a suffix to reserved Windows device names, preserving their extension. |
     | `plugin-sdk/logging-core` | Subsystem logger and redaction helpers |
     | `plugin-sdk/markdown-table-runtime` | Private-local after July 2026; Markdown table mode and conversion helpers |
     | `plugin-sdk/model-session-runtime` | Model/session override helpers such as `applyModelOverrideToSessionEntry` and `resolveAgentMaxConcurrent` |
diff --git a/src/infra/clawhub-artifacts.test.ts b/src/infra/clawhub-artifacts.test.ts
index e418c673447c..b2782f7e38d0 100644
--- a/src/infra/clawhub-artifacts.test.ts
+++ b/src/infra/clawhub-artifacts.test.ts
@@ -63,7 +63,7 @@ function createArchiveResponse(bytes: Uint8Array, headers?: HeadersInit): Respon
     `sha512-${createHash("sha512").update(bytes).digest("base64")}`,
   );
   responseHeaders.set("X-ClawHub-Npm-Shasum", createHash("sha1").update(bytes).digest("hex"));
-  responseHeaders.set("X-ClawHub-Npm-Tarball-Name", "registry-selected.tgz");
+  responseHeaders.set("X-ClawHub-Npm-Tarball-Name", "NUL.tgz");
   responseHeaders.set("X-ClawHub-ClawPack-Spec-Version", "3");
   return new Response(new Uint8Array(bytes), { status: 200, headers: responseHeaders });
 }
@@ -167,7 +167,7 @@ const archiveDownloadCases: Array<{
         fetchImpl: async () => response,
       }),
     expectedResource: "ClawPack download for demo@1.2.3",
-    expectedFileName: "registry-selected.tgz",
+    expectedFileName: "NUL_.tgz",
     expectedArtifact: "clawpack",
   },
   {
@@ -374,7 +374,7 @@ describe("clawhub artifacts", () => {
           `sha512-${createHash("sha512").update(bytes).digest("base64")}`,
         );
         expect(archive.npmShasum).toBe(createHash("sha1").update(bytes).digest("hex"));
-        expect(archive.npmTarballName).toBe("registry-selected.tgz");
+        expect(archive.npmTarballName).toBe("NUL.tgz");
       }
 
       await archive.cleanup();
diff --git a/src/infra/temp-download.ts b/src/infra/temp-download.ts
index 9046a8f39590..f8d82c504a11 100644
--- a/src/infra/temp-download.ts
+++ b/src/infra/temp-download.ts
@@ -1,7 +1,10 @@
 // Creates private temporary workspaces for downloads.
 import "./fs-safe-defaults.js";
-import crypto from "node:crypto";
 import path from "node:path";
+import {
+  buildRandomTempFilePath as buildRandomTempFilePathBase,
+  sanitizeTempFileName,
+} from "@openclaw/fs-safe/advanced";
 import { createSubsystemLogger } from "../logging/subsystem.js";
 import { tempWorkspace } from "./private-temp-workspace.js";
 import { resolvePreferredOpenClawTmpDir } from "./tmp-openclaw-dir.js";
@@ -9,6 +12,7 @@ import { resolvePreferredOpenClawTmpDir } from "./tmp-openclaw-dir.js";
 const logger = createSubsystemLogger("infra:temp-download");
 
 export { resolvePreferredOpenClawTmpDir } from "./tmp-openclaw-dir.js";
+export { sanitizeTempFileName };
 
 // Download targets expose both a default path and a name-safe file builder so
 // callers can keep all transient files inside the same workspace.
@@ -29,24 +33,6 @@ function sanitizeTempPrefix(prefix: string): string {
   return normalized || "tmp";
 }
 
-function sanitizeTempExtension(extension?: string): string {
-  if (!extension) {
-    return "";
-  }
-  const normalized = extension.startsWith(".") ? extension : `.${extension}`;
-  const suffix = normalized.match(/[a-zA-Z0-9._-]+$/)?.[0] ?? "";
-  const token = suffix.replace(/^[._-]+/, "");
-  return token ? `.${token}` : "";
-}
-
-export function sanitizeTempFileName(fileName: string): string {
-  const base = path.basename(fileName).replace(/[^a-zA-Z0-9._-]+/g, "-");
-  const normalized = base.replace(/^-+|-+$/g, "");
-  // "." and ".." pass the character class above but are rejected as workspace
-  // leaf names, so returning them hands callers a throw instead of a safe name.
-  return !normalized || normalized === "." || normalized === ".." ? "download.bin" : normalized;
-}
-
 /** Build a stable temp path shape while keeping caller-controlled text filename-safe. */
 export function buildRandomTempFilePath(params: {
   prefix: string;
@@ -55,16 +41,13 @@ export function buildRandomTempFilePath(params: {
   now?: number;
   uuid?: string;
 }): string {
-  const nowCandidate = params.now;
-  const now =
-    typeof nowCandidate === "number" && Number.isFinite(nowCandidate)
-      ? Math.trunc(nowCandidate)
-      : Date.now();
-  const uuid = params.uuid?.trim() || crypto.randomUUID();
-  return path.join(
-    resolveTempRoot(params.tmpDir),
-    `${sanitizeTempPrefix(params.prefix)}-${now}-${uuid}${sanitizeTempExtension(params.extension)}`,
-  );
+  const rootDir = resolveTempRoot(params.tmpDir);
+  const filePath = buildRandomTempFilePathBase({
+    ...params,
+    rootDir,
+    uuid: params.uuid?.trim() || undefined,
+  });
+  return path.join(rootDir, path.basename(filePath));
 }
 
 export async function createTempDownloadTarget(params: {
diff --git a/src/plugin-sdk/temp-path.test.ts b/src/plugin-sdk/temp-path.test.ts
index ccac9eb3d0fe..5b377cb45867 100644
--- a/src/plugin-sdk/temp-path.test.ts
+++ b/src/plugin-sdk/temp-path.test.ts
@@ -34,6 +34,19 @@ describe("buildRandomTempFilePath", () => {
       expectedBasename: "line-media-123-abc.jpg",
       verifyInsideTmpRoot: false,
     },
+    {
+      name: "preserves relative roots, trimmed UUIDs, and compound extensions",
+      input: {
+        prefix: "archive",
+        extension: "tar.gz",
+        tmpDir: "relative/tmp",
+        now: 123.9,
+        uuid: " abc ",
+      },
+      expectedPath: path.join("relative/tmp", "archive-123-abc.tar.gz"),
+      expectedBasename: "archive-123-abc.tar.gz",
+      verifyInsideTmpRoot: false,
+    },
     {
       name: "sanitizes prefix and extension to avoid path traversal segments",
       input: {
@@ -55,6 +68,21 @@ describe("buildRandomTempFilePath", () => {
       expectPathInsideTmpRoot(result);
     }
   });
+
+  it.each(["../../../escaped", "..\\..\\escaped", "id/name", "id\0name"])(
+    "rejects path-control bytes in the UUID override %j",
+    (uuid) => {
+      expect(() =>
+        buildRandomTempFilePath({ prefix: "download", tmpDir: "/tmp/owned", now: 1, uuid }),
+      ).toThrow(/safe path segment/);
+    },
+  );
+
+  it.each(["", "   "])("generates a UUID for a blank override %j", (uuid) => {
+    const result = buildRandomTempFilePath({ prefix: "media", now: 123, extension: ".jpg", uuid });
+    expect(path.basename(result)).toMatch(/^media-123-[\da-f-]{36}\.jpg$/u);
+    expectPathInsideTmpRoot(result);
+  });
 });
 
 describe("withTempDownloadPath", () => {