diff --git a/src/agents/skills-install.download-tarbz2.e2e.test.ts b/src/agents/skills-install.download-tarbz2.e2e.test.ts
new file mode 100644
index 00000000000..1cadeb621e6
--- /dev/null
+++ b/src/agents/skills-install.download-tarbz2.e2e.test.ts
@@ -0,0 +1,317 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { installSkill } from "./skills-install.js";
+
+const runCommandWithTimeoutMock = vi.fn();
+const scanDirectoryWithSummaryMock = vi.fn();
+const fetchWithSsrFGuardMock = vi.fn();
+
+const originalOpenClawStateDir = process.env.OPENCLAW_STATE_DIR;
+
+afterEach(() => {
+  if (originalOpenClawStateDir === undefined) {
+    delete process.env.OPENCLAW_STATE_DIR;
+  } else {
+    process.env.OPENCLAW_STATE_DIR = originalOpenClawStateDir;
+  }
+});
+
+vi.mock("../process/exec.js", () => ({
+  runCommandWithTimeout: (...args: unknown[]) => runCommandWithTimeoutMock(...args),
+}));
+
+vi.mock("../infra/net/fetch-guard.js", () => ({
+  fetchWithSsrFGuard: (...args: unknown[]) => fetchWithSsrFGuardMock(...args),
+}));
+
+vi.mock("../security/skill-scanner.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../security/skill-scanner.js")>();
+  return {
+    ...actual,
+    scanDirectoryWithSummary: (...args: unknown[]) => scanDirectoryWithSummaryMock(...args),
+  };
+});
+
+async function writeDownloadSkill(params: {
+  workspaceDir: string;
+  name: string;
+  installId: string;
+  url: string;
+  stripComponents?: number;
+  targetDir: string;
+}): Promise<string> {
+  const skillDir = path.join(params.workspaceDir, "skills", params.name);
+  await fs.mkdir(skillDir, { recursive: true });
+  const meta = {
+    openclaw: {
+      install: [
+        {
+          id: params.installId,
+          kind: "download",
+          url: params.url,
+          archive: "tar.bz2",
+          extract: true,
+          stripComponents: params.stripComponents,
+          targetDir: params.targetDir,
+        },
+      ],
+    },
+  };
+  await fs.writeFile(
+    path.join(skillDir, "SKILL.md"),
+    `---
+name: ${params.name}
+description: test skill
+metadata: ${JSON.stringify(meta)}
+---
+
+# ${params.name}
+`,
+    "utf-8",
+  );
+  await fs.writeFile(path.join(skillDir, "runner.js"), "export {};\n", "utf-8");
+  return skillDir;
+}
+
+function setTempStateDir(workspaceDir: string): string {
+  const stateDir = path.join(workspaceDir, "state");
+  process.env.OPENCLAW_STATE_DIR = stateDir;
+  return stateDir;
+}
+
+describe("installSkill download extraction safety (tar.bz2)", () => {
+  beforeEach(() => {
+    runCommandWithTimeoutMock.mockReset();
+    scanDirectoryWithSummaryMock.mockReset();
+    fetchWithSsrFGuardMock.mockReset();
+    scanDirectoryWithSummaryMock.mockResolvedValue({
+      scannedFiles: 0,
+      critical: 0,
+      warn: 0,
+      info: 0,
+      findings: [],
+    });
+  });
+
+  it("rejects tar.bz2 traversal before extraction", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      const stateDir = setTempStateDir(workspaceDir);
+      const targetDir = path.join(stateDir, "tools", "tbz2-slip", "target");
+      const url = "https://example.invalid/evil.tbz2";
+
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(new Uint8Array([1, 2, 3]), { status: 200 }),
+        release: async () => undefined,
+      });
+
+      runCommandWithTimeoutMock.mockImplementation(async (argv: unknown[]) => {
+        const cmd = argv as string[];
+        if (cmd[0] === "tar" && cmd[1] === "tf") {
+          return { code: 0, stdout: "../outside.txt\n", stderr: "", signal: null, killed: false };
+        }
+        if (cmd[0] === "tar" && cmd[1] === "tvf") {
+          return {
+            code: 0,
+            stdout: "-rw-r--r--  0 0 0 0 Jan  1 00:00 ../outside.txt\n",
+            stderr: "",
+            signal: null,
+            killed: false,
+          };
+        }
+        if (cmd[0] === "tar" && cmd[1] === "xf") {
+          throw new Error("should not extract");
+        }
+        return { code: 0, stdout: "", stderr: "", signal: null, killed: false };
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "tbz2-slip",
+        installId: "dl",
+        url,
+        targetDir,
+      });
+
+      const result = await installSkill({ workspaceDir, skillName: "tbz2-slip", installId: "dl" });
+      expect(result.ok).toBe(false);
+      expect(
+        runCommandWithTimeoutMock.mock.calls.some((call) => (call[0] as string[])[1] === "xf"),
+      ).toBe(false);
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+
+  it("rejects tar.bz2 archives containing symlinks", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      const stateDir = setTempStateDir(workspaceDir);
+      const targetDir = path.join(stateDir, "tools", "tbz2-symlink", "target");
+      const url = "https://example.invalid/evil.tbz2";
+
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(new Uint8Array([1, 2, 3]), { status: 200 }),
+        release: async () => undefined,
+      });
+
+      runCommandWithTimeoutMock.mockImplementation(async (argv: unknown[]) => {
+        const cmd = argv as string[];
+        if (cmd[0] === "tar" && cmd[1] === "tf") {
+          return {
+            code: 0,
+            stdout: "link\nlink/pwned.txt\n",
+            stderr: "",
+            signal: null,
+            killed: false,
+          };
+        }
+        if (cmd[0] === "tar" && cmd[1] === "tvf") {
+          return {
+            code: 0,
+            stdout: "lrwxr-xr-x  0 0 0 0 Jan  1 00:00 link -> ../outside\n",
+            stderr: "",
+            signal: null,
+            killed: false,
+          };
+        }
+        if (cmd[0] === "tar" && cmd[1] === "xf") {
+          throw new Error("should not extract");
+        }
+        return { code: 0, stdout: "", stderr: "", signal: null, killed: false };
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "tbz2-symlink",
+        installId: "dl",
+        url,
+        targetDir,
+      });
+
+      const result = await installSkill({
+        workspaceDir,
+        skillName: "tbz2-symlink",
+        installId: "dl",
+      });
+      expect(result.ok).toBe(false);
+      expect(result.stderr.toLowerCase()).toContain("link");
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+
+  it("extracts tar.bz2 with stripComponents safely (preflight only)", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      const stateDir = setTempStateDir(workspaceDir);
+      const targetDir = path.join(stateDir, "tools", "tbz2-ok", "target");
+      const url = "https://example.invalid/good.tbz2";
+
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(new Uint8Array([1, 2, 3]), { status: 200 }),
+        release: async () => undefined,
+      });
+
+      runCommandWithTimeoutMock.mockImplementation(async (argv: unknown[]) => {
+        const cmd = argv as string[];
+        if (cmd[0] === "tar" && cmd[1] === "tf") {
+          return {
+            code: 0,
+            stdout: "package/hello.txt\n",
+            stderr: "",
+            signal: null,
+            killed: false,
+          };
+        }
+        if (cmd[0] === "tar" && cmd[1] === "tvf") {
+          return {
+            code: 0,
+            stdout: "-rw-r--r--  0 0 0 0 Jan  1 00:00 package/hello.txt\n",
+            stderr: "",
+            signal: null,
+            killed: false,
+          };
+        }
+        if (cmd[0] === "tar" && cmd[1] === "xf") {
+          return { code: 0, stdout: "ok", stderr: "", signal: null, killed: false };
+        }
+        return { code: 0, stdout: "", stderr: "", signal: null, killed: false };
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "tbz2-ok",
+        installId: "dl",
+        url,
+        stripComponents: 1,
+        targetDir,
+      });
+
+      const result = await installSkill({ workspaceDir, skillName: "tbz2-ok", installId: "dl" });
+      expect(result.ok).toBe(true);
+      expect(
+        runCommandWithTimeoutMock.mock.calls.some((call) => (call[0] as string[])[1] === "xf"),
+      ).toBe(true);
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+
+  it("rejects tar.bz2 stripComponents escape", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      const stateDir = setTempStateDir(workspaceDir);
+      const targetDir = path.join(stateDir, "tools", "tbz2-strip-escape", "target");
+      const url = "https://example.invalid/evil.tbz2";
+
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(new Uint8Array([1, 2, 3]), { status: 200 }),
+        release: async () => undefined,
+      });
+
+      runCommandWithTimeoutMock.mockImplementation(async (argv: unknown[]) => {
+        const cmd = argv as string[];
+        if (cmd[0] === "tar" && cmd[1] === "tf") {
+          return { code: 0, stdout: "a/../b.txt\n", stderr: "", signal: null, killed: false };
+        }
+        if (cmd[0] === "tar" && cmd[1] === "tvf") {
+          return {
+            code: 0,
+            stdout: "-rw-r--r--  0 0 0 0 Jan  1 00:00 a/../b.txt\n",
+            stderr: "",
+            signal: null,
+            killed: false,
+          };
+        }
+        if (cmd[0] === "tar" && cmd[1] === "xf") {
+          throw new Error("should not extract");
+        }
+        return { code: 0, stdout: "", stderr: "", signal: null, killed: false };
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "tbz2-strip-escape",
+        installId: "dl",
+        url,
+        stripComponents: 1,
+        targetDir,
+      });
+
+      const result = await installSkill({
+        workspaceDir,
+        skillName: "tbz2-strip-escape",
+        installId: "dl",
+      });
+      expect(result.ok).toBe(false);
+      expect(
+        runCommandWithTimeoutMock.mock.calls.some((call) => (call[0] as string[])[1] === "xf"),
+      ).toBe(false);
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+});
diff --git a/src/agents/skills-install.download.e2e.test.ts b/src/agents/skills-install.download.e2e.test.ts
new file mode 100644
index 00000000000..540922ea6f1
--- /dev/null
+++ b/src/agents/skills-install.download.e2e.test.ts
@@ -0,0 +1,335 @@
+import JSZip from "jszip";
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import * as tar from "tar";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { installSkill } from "./skills-install.js";
+
+const runCommandWithTimeoutMock = vi.fn();
+const scanDirectoryWithSummaryMock = vi.fn();
+const fetchWithSsrFGuardMock = vi.fn();
+
+const originalOpenClawStateDir = process.env.OPENCLAW_STATE_DIR;
+
+afterEach(() => {
+  if (originalOpenClawStateDir === undefined) {
+    delete process.env.OPENCLAW_STATE_DIR;
+  } else {
+    process.env.OPENCLAW_STATE_DIR = originalOpenClawStateDir;
+  }
+});
+
+vi.mock("../process/exec.js", () => ({
+  runCommandWithTimeout: (...args: unknown[]) => runCommandWithTimeoutMock(...args),
+}));
+
+vi.mock("../infra/net/fetch-guard.js", () => ({
+  fetchWithSsrFGuard: (...args: unknown[]) => fetchWithSsrFGuardMock(...args),
+}));
+
+vi.mock("../security/skill-scanner.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../security/skill-scanner.js")>();
+  return {
+    ...actual,
+    scanDirectoryWithSummary: (...args: unknown[]) => scanDirectoryWithSummaryMock(...args),
+  };
+});
+
+async function writeDownloadSkill(params: {
+  workspaceDir: string;
+  name: string;
+  installId: string;
+  url: string;
+  archive: "tar.gz" | "tar.bz2" | "zip";
+  stripComponents?: number;
+  targetDir: string;
+}): Promise<string> {
+  const skillDir = path.join(params.workspaceDir, "skills", params.name);
+  await fs.mkdir(skillDir, { recursive: true });
+  const meta = {
+    openclaw: {
+      install: [
+        {
+          id: params.installId,
+          kind: "download",
+          url: params.url,
+          archive: params.archive,
+          extract: true,
+          stripComponents: params.stripComponents,
+          targetDir: params.targetDir,
+        },
+      ],
+    },
+  };
+  await fs.writeFile(
+    path.join(skillDir, "SKILL.md"),
+    `---
+name: ${params.name}
+description: test skill
+metadata: ${JSON.stringify(meta)}
+---
+
+# ${params.name}
+`,
+    "utf-8",
+  );
+  await fs.writeFile(path.join(skillDir, "runner.js"), "export {};\n", "utf-8");
+  return skillDir;
+}
+
+async function fileExists(filePath: string): Promise<boolean> {
+  try {
+    await fs.stat(filePath);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+function setTempStateDir(workspaceDir: string): string {
+  const stateDir = path.join(workspaceDir, "state");
+  process.env.OPENCLAW_STATE_DIR = stateDir;
+  return stateDir;
+}
+
+describe("installSkill download extraction safety", () => {
+  beforeEach(() => {
+    runCommandWithTimeoutMock.mockReset();
+    scanDirectoryWithSummaryMock.mockReset();
+    fetchWithSsrFGuardMock.mockReset();
+    scanDirectoryWithSummaryMock.mockResolvedValue({
+      scannedFiles: 0,
+      critical: 0,
+      warn: 0,
+      info: 0,
+      findings: [],
+    });
+  });
+
+  it("rejects zip slip traversal", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      const stateDir = setTempStateDir(workspaceDir);
+      const targetDir = path.join(stateDir, "tools", "zip-slip", "target");
+      const outsideWriteDir = path.join(workspaceDir, "outside-write");
+      const outsideWritePath = path.join(outsideWriteDir, "pwned.txt");
+      const url = "https://example.invalid/evil.zip";
+
+      const zip = new JSZip();
+      zip.file("../outside-write/pwned.txt", "pwnd");
+      const buffer = await zip.generateAsync({ type: "nodebuffer" });
+
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(buffer, { status: 200 }),
+        release: async () => undefined,
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "zip-slip",
+        installId: "dl",
+        url,
+        archive: "zip",
+        targetDir,
+      });
+
+      const result = await installSkill({ workspaceDir, skillName: "zip-slip", installId: "dl" });
+      expect(result.ok).toBe(false);
+      expect(await fileExists(outsideWritePath)).toBe(false);
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+
+  it("rejects tar.gz traversal", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      const stateDir = setTempStateDir(workspaceDir);
+      const targetDir = path.join(stateDir, "tools", "tar-slip", "target");
+      const insideDir = path.join(workspaceDir, "inside");
+      const outsideWriteDir = path.join(workspaceDir, "outside-write");
+      const outsideWritePath = path.join(outsideWriteDir, "pwned.txt");
+      const archivePath = path.join(workspaceDir, "evil.tgz");
+      const url = "https://example.invalid/evil";
+
+      await fs.mkdir(insideDir, { recursive: true });
+      await fs.mkdir(outsideWriteDir, { recursive: true });
+      await fs.writeFile(outsideWritePath, "pwnd", "utf-8");
+
+      await tar.c({ cwd: insideDir, file: archivePath, gzip: true }, [
+        "../outside-write/pwned.txt",
+      ]);
+      await fs.rm(outsideWriteDir, { recursive: true, force: true });
+
+      const buffer = await fs.readFile(archivePath);
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(buffer, { status: 200 }),
+        release: async () => undefined,
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "tar-slip",
+        installId: "dl",
+        url,
+        archive: "tar.gz",
+        targetDir,
+      });
+
+      const result = await installSkill({ workspaceDir, skillName: "tar-slip", installId: "dl" });
+      expect(result.ok).toBe(false);
+      expect(await fileExists(outsideWritePath)).toBe(false);
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+
+  it("extracts zip with stripComponents safely", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      const stateDir = setTempStateDir(workspaceDir);
+      const targetDir = path.join(stateDir, "tools", "zip-good", "target");
+      const url = "https://example.invalid/good.zip";
+
+      const zip = new JSZip();
+      zip.file("package/hello.txt", "hi");
+      const buffer = await zip.generateAsync({ type: "nodebuffer" });
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(buffer, { status: 200 }),
+        release: async () => undefined,
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "zip-good",
+        installId: "dl",
+        url,
+        archive: "zip",
+        stripComponents: 1,
+        targetDir,
+      });
+
+      const result = await installSkill({ workspaceDir, skillName: "zip-good", installId: "dl" });
+      expect(result.ok).toBe(true);
+      expect(await fs.readFile(path.join(targetDir, "hello.txt"), "utf-8")).toBe("hi");
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+
+  it("rejects targetDir outside the per-skill tools root", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      const stateDir = setTempStateDir(workspaceDir);
+      const targetDir = path.join(workspaceDir, "outside");
+      const url = "https://example.invalid/good.zip";
+
+      const zip = new JSZip();
+      zip.file("hello.txt", "hi");
+      const buffer = await zip.generateAsync({ type: "nodebuffer" });
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(buffer, { status: 200 }),
+        release: async () => undefined,
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "targetdir-escape",
+        installId: "dl",
+        url,
+        archive: "zip",
+        targetDir,
+      });
+
+      const result = await installSkill({
+        workspaceDir,
+        skillName: "targetdir-escape",
+        installId: "dl",
+      });
+      expect(result.ok).toBe(false);
+      expect(result.stderr).toContain("Refusing to install outside the skill tools directory");
+      expect(fetchWithSsrFGuardMock.mock.calls.length).toBe(0);
+
+      expect(stateDir.length).toBeGreaterThan(0);
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+
+  it("allows relative targetDir inside the per-skill tools root", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      const stateDir = setTempStateDir(workspaceDir);
+      const url = "https://example.invalid/good.zip";
+
+      const zip = new JSZip();
+      zip.file("hello.txt", "hi");
+      const buffer = await zip.generateAsync({ type: "nodebuffer" });
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(buffer, { status: 200 }),
+        release: async () => undefined,
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "relative-targetdir",
+        installId: "dl",
+        url,
+        archive: "zip",
+        targetDir: "runtime",
+      });
+
+      const result = await installSkill({
+        workspaceDir,
+        skillName: "relative-targetdir",
+        installId: "dl",
+      });
+      expect(result.ok).toBe(true);
+      expect(
+        await fs.readFile(
+          path.join(stateDir, "tools", "relative-targetdir", "runtime", "hello.txt"),
+          "utf-8",
+        ),
+      ).toBe("hi");
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+
+  it("rejects relative targetDir traversal", async () => {
+    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
+    try {
+      setTempStateDir(workspaceDir);
+      const url = "https://example.invalid/good.zip";
+
+      const zip = new JSZip();
+      zip.file("hello.txt", "hi");
+      const buffer = await zip.generateAsync({ type: "nodebuffer" });
+      fetchWithSsrFGuardMock.mockResolvedValue({
+        response: new Response(buffer, { status: 200 }),
+        release: async () => undefined,
+      });
+
+      await writeDownloadSkill({
+        workspaceDir,
+        name: "relative-traversal",
+        installId: "dl",
+        url,
+        archive: "zip",
+        targetDir: "../outside",
+      });
+
+      const result = await installSkill({
+        workspaceDir,
+        skillName: "relative-traversal",
+        installId: "dl",
+      });
+      expect(result.ok).toBe(false);
+      expect(result.stderr).toContain("Refusing to install outside the skill tools directory");
+      expect(fetchWithSsrFGuardMock.mock.calls.length).toBe(0);
+    } finally {
+      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
+    }
+  });
+});
diff --git a/src/agents/skills-install.e2e.test.ts b/src/agents/skills-install.e2e.test.ts
index eeb64121b20..696b03e828b 100644
--- a/src/agents/skills-install.e2e.test.ts
+++ b/src/agents/skills-install.e2e.test.ts
@@ -1,23 +1,16 @@
-import JSZip from "jszip";
 import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
-import * as tar from "tar";
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import { installSkill } from "./skills-install.js";
 
 const runCommandWithTimeoutMock = vi.fn();
 const scanDirectoryWithSummaryMock = vi.fn();
-const fetchWithSsrFGuardMock = vi.fn();
 
 vi.mock("../process/exec.js", () => ({
   runCommandWithTimeout: (...args: unknown[]) => runCommandWithTimeoutMock(...args),
 }));
 
-vi.mock("../infra/net/fetch-guard.js", () => ({
-  fetchWithSsrFGuard: (...args: unknown[]) => fetchWithSsrFGuardMock(...args),
-}));
-
 vi.mock("../security/skill-scanner.js", async (importOriginal) => {
   const actual = await importOriginal<typeof import("../security/skill-scanner.js")>();
   return {
@@ -45,62 +38,10 @@ metadata: {"openclaw":{"install":[{"id":"deps","kind":"node","package":"example-
   return skillDir;
 }
 
-async function writeDownloadSkill(params: {
-  workspaceDir: string;
-  name: string;
-  installId: string;
-  url: string;
-  archive: "tar.gz" | "tar.bz2" | "zip";
-  stripComponents?: number;
-  targetDir: string;
-}): Promise<string> {
-  const skillDir = path.join(params.workspaceDir, "skills", params.name);
-  await fs.mkdir(skillDir, { recursive: true });
-  const meta = {
-    openclaw: {
-      install: [
-        {
-          id: params.installId,
-          kind: "download",
-          url: params.url,
-          archive: params.archive,
-          extract: true,
-          stripComponents: params.stripComponents,
-          targetDir: params.targetDir,
-        },
-      ],
-    },
-  };
-  await fs.writeFile(
-    path.join(skillDir, "SKILL.md"),
-    `---
-name: ${params.name}
-description: test skill
-metadata: ${JSON.stringify(meta)}
----
-
-# ${params.name}
-`,
-    "utf-8",
-  );
-  await fs.writeFile(path.join(skillDir, "runner.js"), "export {};\n", "utf-8");
-  return skillDir;
-}
-
-async function fileExists(filePath: string): Promise<boolean> {
-  try {
-    await fs.stat(filePath);
-    return true;
-  } catch {
-    return false;
-  }
-}
-
 describe("installSkill code safety scanning", () => {
   beforeEach(() => {
     runCommandWithTimeoutMock.mockReset();
     scanDirectoryWithSummaryMock.mockReset();
-    fetchWithSsrFGuardMock.mockReset();
     runCommandWithTimeoutMock.mockResolvedValue({
       code: 0,
       stdout: "ok",
@@ -171,346 +112,3 @@ describe("installSkill code safety scanning", () => {
     }
   });
 });
-
-describe("installSkill download extraction safety", () => {
-  beforeEach(() => {
-    runCommandWithTimeoutMock.mockReset();
-    scanDirectoryWithSummaryMock.mockReset();
-    fetchWithSsrFGuardMock.mockReset();
-    scanDirectoryWithSummaryMock.mockResolvedValue({
-      scannedFiles: 0,
-      critical: 0,
-      warn: 0,
-      info: 0,
-      findings: [],
-    });
-  });
-
-  it("rejects zip slip traversal", async () => {
-    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
-    try {
-      const targetDir = path.join(workspaceDir, "target");
-      const outsideWriteDir = path.join(workspaceDir, "outside-write");
-      const outsideWritePath = path.join(outsideWriteDir, "pwned.txt");
-      const url = "https://example.invalid/evil.zip";
-
-      const zip = new JSZip();
-      zip.file("../outside-write/pwned.txt", "pwnd");
-      const buffer = await zip.generateAsync({ type: "nodebuffer" });
-
-      fetchWithSsrFGuardMock.mockResolvedValue({
-        response: new Response(buffer, { status: 200 }),
-        release: async () => undefined,
-      });
-
-      await writeDownloadSkill({
-        workspaceDir,
-        name: "zip-slip",
-        installId: "dl",
-        url,
-        archive: "zip",
-        targetDir,
-      });
-
-      const result = await installSkill({ workspaceDir, skillName: "zip-slip", installId: "dl" });
-      expect(result.ok).toBe(false);
-      expect(await fileExists(outsideWritePath)).toBe(false);
-    } finally {
-      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
-    }
-  });
-
-  it("rejects tar.gz traversal", async () => {
-    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
-    try {
-      const targetDir = path.join(workspaceDir, "target");
-      const insideDir = path.join(workspaceDir, "inside");
-      const outsideWriteDir = path.join(workspaceDir, "outside-write");
-      const outsideWritePath = path.join(outsideWriteDir, "pwned.txt");
-      const archivePath = path.join(workspaceDir, "evil.tgz");
-      const url = "https://example.invalid/evil";
-
-      await fs.mkdir(insideDir, { recursive: true });
-      await fs.mkdir(outsideWriteDir, { recursive: true });
-      await fs.writeFile(outsideWritePath, "pwnd", "utf-8");
-
-      await tar.c({ cwd: insideDir, file: archivePath, gzip: true }, [
-        "../outside-write/pwned.txt",
-      ]);
-      await fs.rm(outsideWriteDir, { recursive: true, force: true });
-
-      const buffer = await fs.readFile(archivePath);
-      fetchWithSsrFGuardMock.mockResolvedValue({
-        response: new Response(buffer, { status: 200 }),
-        release: async () => undefined,
-      });
-
-      await writeDownloadSkill({
-        workspaceDir,
-        name: "tar-slip",
-        installId: "dl",
-        url,
-        archive: "tar.gz",
-        targetDir,
-      });
-
-      const result = await installSkill({ workspaceDir, skillName: "tar-slip", installId: "dl" });
-      expect(result.ok).toBe(false);
-      expect(await fileExists(outsideWritePath)).toBe(false);
-    } finally {
-      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
-    }
-  });
-
-  it("extracts zip with stripComponents safely", async () => {
-    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
-    try {
-      const targetDir = path.join(workspaceDir, "target");
-      const url = "https://example.invalid/good.zip";
-
-      const zip = new JSZip();
-      zip.file("package/hello.txt", "hi");
-      const buffer = await zip.generateAsync({ type: "nodebuffer" });
-      fetchWithSsrFGuardMock.mockResolvedValue({
-        response: new Response(buffer, { status: 200 }),
-        release: async () => undefined,
-      });
-
-      await writeDownloadSkill({
-        workspaceDir,
-        name: "zip-good",
-        installId: "dl",
-        url,
-        archive: "zip",
-        stripComponents: 1,
-        targetDir,
-      });
-
-      const result = await installSkill({ workspaceDir, skillName: "zip-good", installId: "dl" });
-      expect(result.ok).toBe(true);
-      expect(await fs.readFile(path.join(targetDir, "hello.txt"), "utf-8")).toBe("hi");
-    } finally {
-      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
-    }
-  });
-
-  it("rejects tar.bz2 traversal before extraction", async () => {
-    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
-    try {
-      const targetDir = path.join(workspaceDir, "target");
-      const url = "https://example.invalid/evil.tbz2";
-
-      fetchWithSsrFGuardMock.mockResolvedValue({
-        response: new Response(new Uint8Array([1, 2, 3]), { status: 200 }),
-        release: async () => undefined,
-      });
-
-      runCommandWithTimeoutMock.mockImplementation(async (argv: unknown[]) => {
-        const cmd = argv as string[];
-        if (cmd[0] === "tar" && cmd[1] === "tf") {
-          return { code: 0, stdout: "../outside.txt\n", stderr: "", signal: null, killed: false };
-        }
-        if (cmd[0] === "tar" && cmd[1] === "tvf") {
-          return {
-            code: 0,
-            stdout: "-rw-r--r--  0 0 0 0 Jan  1 00:00 ../outside.txt\n",
-            stderr: "",
-            signal: null,
-            killed: false,
-          };
-        }
-        if (cmd[0] === "tar" && cmd[1] === "xf") {
-          throw new Error("should not extract");
-        }
-        return { code: 0, stdout: "", stderr: "", signal: null, killed: false };
-      });
-
-      await writeDownloadSkill({
-        workspaceDir,
-        name: "tbz2-slip",
-        installId: "dl",
-        url,
-        archive: "tar.bz2",
-        targetDir,
-      });
-
-      const result = await installSkill({ workspaceDir, skillName: "tbz2-slip", installId: "dl" });
-      expect(result.ok).toBe(false);
-      expect(
-        runCommandWithTimeoutMock.mock.calls.some((call) => (call[0] as string[])[1] === "xf"),
-      ).toBe(false);
-    } finally {
-      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
-    }
-  });
-
-  it("rejects tar.bz2 archives containing symlinks", async () => {
-    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
-    try {
-      const targetDir = path.join(workspaceDir, "target");
-      const url = "https://example.invalid/evil.tbz2";
-
-      fetchWithSsrFGuardMock.mockResolvedValue({
-        response: new Response(new Uint8Array([1, 2, 3]), { status: 200 }),
-        release: async () => undefined,
-      });
-
-      runCommandWithTimeoutMock.mockImplementation(async (argv: unknown[]) => {
-        const cmd = argv as string[];
-        if (cmd[0] === "tar" && cmd[1] === "tf") {
-          return {
-            code: 0,
-            stdout: "link\nlink/pwned.txt\n",
-            stderr: "",
-            signal: null,
-            killed: false,
-          };
-        }
-        if (cmd[0] === "tar" && cmd[1] === "tvf") {
-          return {
-            code: 0,
-            stdout: "lrwxr-xr-x  0 0 0 0 Jan  1 00:00 link -> ../outside\n",
-            stderr: "",
-            signal: null,
-            killed: false,
-          };
-        }
-        if (cmd[0] === "tar" && cmd[1] === "xf") {
-          throw new Error("should not extract");
-        }
-        return { code: 0, stdout: "", stderr: "", signal: null, killed: false };
-      });
-
-      await writeDownloadSkill({
-        workspaceDir,
-        name: "tbz2-symlink",
-        installId: "dl",
-        url,
-        archive: "tar.bz2",
-        targetDir,
-      });
-
-      const result = await installSkill({
-        workspaceDir,
-        skillName: "tbz2-symlink",
-        installId: "dl",
-      });
-      expect(result.ok).toBe(false);
-      expect(result.stderr.toLowerCase()).toContain("link");
-    } finally {
-      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
-    }
-  });
-
-  it("extracts tar.bz2 with stripComponents safely (preflight only)", async () => {
-    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
-    try {
-      const targetDir = path.join(workspaceDir, "target");
-      const url = "https://example.invalid/good.tbz2";
-
-      fetchWithSsrFGuardMock.mockResolvedValue({
-        response: new Response(new Uint8Array([1, 2, 3]), { status: 200 }),
-        release: async () => undefined,
-      });
-
-      runCommandWithTimeoutMock.mockImplementation(async (argv: unknown[]) => {
-        const cmd = argv as string[];
-        if (cmd[0] === "tar" && cmd[1] === "tf") {
-          return {
-            code: 0,
-            stdout: "package/hello.txt\n",
-            stderr: "",
-            signal: null,
-            killed: false,
-          };
-        }
-        if (cmd[0] === "tar" && cmd[1] === "tvf") {
-          return {
-            code: 0,
-            stdout: "-rw-r--r--  0 0 0 0 Jan  1 00:00 package/hello.txt\n",
-            stderr: "",
-            signal: null,
-            killed: false,
-          };
-        }
-        if (cmd[0] === "tar" && cmd[1] === "xf") {
-          return { code: 0, stdout: "ok", stderr: "", signal: null, killed: false };
-        }
-        return { code: 0, stdout: "", stderr: "", signal: null, killed: false };
-      });
-
-      await writeDownloadSkill({
-        workspaceDir,
-        name: "tbz2-ok",
-        installId: "dl",
-        url,
-        archive: "tar.bz2",
-        stripComponents: 1,
-        targetDir,
-      });
-
-      const result = await installSkill({ workspaceDir, skillName: "tbz2-ok", installId: "dl" });
-      expect(result.ok).toBe(true);
-      expect(
-        runCommandWithTimeoutMock.mock.calls.some((call) => (call[0] as string[])[1] === "xf"),
-      ).toBe(true);
-    } finally {
-      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
-    }
-  });
-
-  it("rejects tar.bz2 stripComponents escape", async () => {
-    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-skills-install-"));
-    try {
-      const targetDir = path.join(workspaceDir, "target");
-      const url = "https://example.invalid/evil.tbz2";
-
-      fetchWithSsrFGuardMock.mockResolvedValue({
-        response: new Response(new Uint8Array([1, 2, 3]), { status: 200 }),
-        release: async () => undefined,
-      });
-
-      runCommandWithTimeoutMock.mockImplementation(async (argv: unknown[]) => {
-        const cmd = argv as string[];
-        if (cmd[0] === "tar" && cmd[1] === "tf") {
-          return { code: 0, stdout: "a/../b.txt\n", stderr: "", signal: null, killed: false };
-        }
-        if (cmd[0] === "tar" && cmd[1] === "tvf") {
-          return {
-            code: 0,
-            stdout: "-rw-r--r--  0 0 0 0 Jan  1 00:00 a/../b.txt\n",
-            stderr: "",
-            signal: null,
-            killed: false,
-          };
-        }
-        if (cmd[0] === "tar" && cmd[1] === "xf") {
-          throw new Error("should not extract");
-        }
-        return { code: 0, stdout: "", stderr: "", signal: null, killed: false };
-      });
-
-      await writeDownloadSkill({
-        workspaceDir,
-        name: "tbz2-strip-escape",
-        installId: "dl",
-        url,
-        archive: "tar.bz2",
-        stripComponents: 1,
-        targetDir,
-      });
-
-      const result = await installSkill({
-        workspaceDir,
-        skillName: "tbz2-strip-escape",
-        installId: "dl",
-      });
-      expect(result.ok).toBe(false);
-      expect(
-        runCommandWithTimeoutMock.mock.calls.some((call) => (call[0] as string[])[1] === "xf"),
-      ).toBe(false);
-    } finally {
-      await fs.rm(workspaceDir, { recursive: true, force: true }).catch(() => undefined);
-    }
-  });
-});
diff --git a/src/infra/install-safe-path.test.ts b/src/infra/install-safe-path.test.ts
new file mode 100644
index 00000000000..1d6b9b6e4e5
--- /dev/null
+++ b/src/infra/install-safe-path.test.ts
@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+import { safePathSegmentHashed } from "./install-safe-path.js";
+
+describe("safePathSegmentHashed", () => {
+  it("keeps safe names unchanged", () => {
+    expect(safePathSegmentHashed("demo-skill")).toBe("demo-skill");
+  });
+
+  it("normalizes separators and adds hash suffix", () => {
+    const result = safePathSegmentHashed("../../demo/skill");
+    expect(result.includes("/")).toBe(false);
+    expect(result.includes("\\")).toBe(false);
+    expect(result).toMatch(/-[a-f0-9]{10}$/);
+  });
+
+  it("hashes long names while staying bounded", () => {
+    const long = "a".repeat(100);
+    const result = safePathSegmentHashed(long);
+    expect(result.length).toBeLessThanOrEqual(61);
+    expect(result).toMatch(/-[a-f0-9]{10}$/);
+  });
+});
diff --git a/src/infra/path-safety.test.ts b/src/infra/path-safety.test.ts
new file mode 100644
index 00000000000..b05eeced172
--- /dev/null
+++ b/src/infra/path-safety.test.ts
@@ -0,0 +1,16 @@
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import { isWithinDir, resolveSafeBaseDir } from "./path-safety.js";
+
+describe("path-safety", () => {
+  it("resolves safe base dir with trailing separator", () => {
+    const base = resolveSafeBaseDir("/tmp/demo");
+    expect(base.endsWith(path.sep)).toBe(true);
+  });
+
+  it("checks directory containment", () => {
+    expect(isWithinDir("/tmp/demo", "/tmp/demo")).toBe(true);
+    expect(isWithinDir("/tmp/demo", "/tmp/demo/sub/file.txt")).toBe(true);
+    expect(isWithinDir("/tmp/demo", "/tmp/demo/../escape.txt")).toBe(false);
+  });
+});