diff --git a/CHANGELOG.md b/CHANGELOG.md
index a87de8b23ac..cf40d8a20aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Security/Sandbox media: restrict sandbox media tmp-path allowances to OpenClaw-managed tmp roots instead of broad host `os.tmpdir()` trust, and add outbound/channel guardrails (tmp-path lint + media-root smoke tests) to prevent regressions in local media attachment reads.
 - Config/Plugins: treat stale removed `google-antigravity-auth` plugin references as compatibility warnings (not hard validation errors) across `plugins.entries`, `plugins.allow`, `plugins.deny`, and `plugins.slots.memory`, so startup no longer fails after antigravity removal. (#25538, #25862) Thanks @chilu18.
 - Security/Workspace FS: normalize `@`-prefixed paths before workspace-boundary checks (including workspace-only read/write/edit and sandbox mount path guards), preventing absolute-path escape attempts from bypassing guard validation. This ships in the next npm release. Thanks @tdjackey for reporting.
 - Security/Native images: enforce `tools.fs.workspaceOnly` for native prompt image auto-load (including history refs), preventing out-of-workspace sandbox mounts from being implicitly ingested as vision input. This ships in the next npm release. Thanks @tdjackey for reporting.
diff --git a/extensions/llm-task/src/llm-task-tool.ts b/extensions/llm-task/src/llm-task-tool.ts
index 87588d7adbd..6a58118618c 100644
--- a/extensions/llm-task/src/llm-task-tool.ts
+++ b/extensions/llm-task/src/llm-task-tool.ts
@@ -1,8 +1,8 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import { Type } from "@sinclair/typebox";
 import Ajv from "ajv";
+import { resolvePreferredOpenClawTmpDir } from "openclaw/plugin-sdk";
 // NOTE: This extension is intended to be bundled with OpenClaw.
 // When running from source (tests/dev), OpenClaw internals live under src/.
 // When running from a built install, internals live under dist/ (no src/ tree).
@@ -180,7 +180,9 @@ export function createLlmTaskTool(api: OpenClawPluginApi) {
 
       let tmpDir: string | null = null;
       try {
-        tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-llm-task-"));
+        tmpDir = await fs.mkdtemp(
+          path.join(resolvePreferredOpenClawTmpDir(), "openclaw-llm-task-"),
+        );
         const sessionId = `llm-task-${Date.now()}`;
         const sessionFile = path.join(tmpDir, "session.json");
 
diff --git a/package.json b/package.json
index 66a60a5dc00..69657a04cf2 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "build": "pnpm canvas:a2ui:bundle && tsdown && pnpm build:plugin-sdk:dts && node --import tsx scripts/write-plugin-sdk-entry-dts.ts && node --import tsx scripts/canvas-a2ui-copy.ts && node --import tsx scripts/copy-hook-metadata.ts && node --import tsx scripts/copy-export-html-templates.ts && node --import tsx scripts/write-build-info.ts && node --import tsx scripts/write-cli-compat.ts",
     "build:plugin-sdk:dts": "tsc -p tsconfig.plugin-sdk.dts.json",
     "canvas:a2ui:bundle": "bash scripts/bundle-a2ui.sh",
-    "check": "pnpm format:check && pnpm tsgo && pnpm lint",
+    "check": "pnpm format:check && pnpm tsgo && pnpm lint && pnpm lint:tmp:no-random-messaging",
     "check:docs": "pnpm format:docs:check && pnpm lint:docs && pnpm docs:check-links",
     "check:loc": "node --import tsx scripts/check-ts-max-loc.ts --max 500",
     "deadcode:ci": "pnpm deadcode:report:ci:knip && pnpm deadcode:report:ci:ts-prune && pnpm deadcode:report:ci:ts-unused",
@@ -93,6 +93,7 @@
     "lint:docs:fix": "pnpm dlx markdownlint-cli2 --fix",
     "lint:fix": "oxlint --type-aware --fix && pnpm format",
     "lint:swift": "swiftlint lint --config .swiftlint.yml && (cd apps/ios && swiftlint lint --config .swiftlint.yml)",
+    "lint:tmp:no-random-messaging": "node scripts/check-no-random-messaging-tmp.mjs",
     "lint:ui:no-raw-window-open": "node scripts/check-no-raw-window-open.mjs",
     "mac:open": "open dist/OpenClaw.app",
     "mac:package": "bash scripts/package-mac-app.sh",
diff --git a/scripts/check-no-random-messaging-tmp.mjs b/scripts/check-no-random-messaging-tmp.mjs
new file mode 100644
index 00000000000..c2d6395f4dd
--- /dev/null
+++ b/scripts/check-no-random-messaging-tmp.mjs
@@ -0,0 +1,173 @@
+#!/usr/bin/env node
+
+import { promises as fs } from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import ts from "typescript";
+
+const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const sourceRoots = [
+  path.join(repoRoot, "src", "channels"),
+  path.join(repoRoot, "src", "infra", "outbound"),
+  path.join(repoRoot, "src", "line"),
+  path.join(repoRoot, "src", "media-understanding"),
+  path.join(repoRoot, "extensions"),
+];
+const allowedCallsites = new Set([path.join(repoRoot, "extensions", "feishu", "src", "dedup.ts")]);
+
+function isTestLikeFile(filePath) {
+  return (
+    filePath.endsWith(".test.ts") ||
+    filePath.endsWith(".test-utils.ts") ||
+    filePath.endsWith(".test-harness.ts") ||
+    filePath.endsWith(".e2e-harness.ts")
+  );
+}
+
+async function collectTypeScriptFiles(dir) {
+  const entries = await fs.readdir(dir, { withFileTypes: true });
+  const out = [];
+  for (const entry of entries) {
+    const entryPath = path.join(dir, entry.name);
+    if (entry.isDirectory()) {
+      out.push(...(await collectTypeScriptFiles(entryPath)));
+      continue;
+    }
+    if (!entry.isFile()) {
+      continue;
+    }
+    if (!entryPath.endsWith(".ts")) {
+      continue;
+    }
+    if (isTestLikeFile(entryPath)) {
+      continue;
+    }
+    out.push(entryPath);
+  }
+  return out;
+}
+
+function collectNodeOsImports(sourceFile) {
+  const osNamespaceOrDefault = new Set();
+  const namedTmpdir = new Set();
+  for (const statement of sourceFile.statements) {
+    if (!ts.isImportDeclaration(statement)) {
+      continue;
+    }
+    if (!statement.importClause || !ts.isStringLiteral(statement.moduleSpecifier)) {
+      continue;
+    }
+    if (statement.moduleSpecifier.text !== "node:os") {
+      continue;
+    }
+    const clause = statement.importClause;
+    if (clause.name) {
+      osNamespaceOrDefault.add(clause.name.text);
+    }
+    if (!clause.namedBindings) {
+      continue;
+    }
+    if (ts.isNamespaceImport(clause.namedBindings)) {
+      osNamespaceOrDefault.add(clause.namedBindings.name.text);
+      continue;
+    }
+    for (const element of clause.namedBindings.elements) {
+      if ((element.propertyName?.text ?? element.name.text) === "tmpdir") {
+        namedTmpdir.add(element.name.text);
+      }
+    }
+  }
+  return { osNamespaceOrDefault, namedTmpdir };
+}
+
+function unwrapExpression(expression) {
+  let current = expression;
+  while (true) {
+    if (ts.isParenthesizedExpression(current)) {
+      current = current.expression;
+      continue;
+    }
+    if (ts.isAsExpression(current) || ts.isTypeAssertionExpression(current)) {
+      current = current.expression;
+      continue;
+    }
+    if (ts.isNonNullExpression(current)) {
+      current = current.expression;
+      continue;
+    }
+    return current;
+  }
+}
+
+export function findMessagingTmpdirCallLines(content, fileName = "source.ts") {
+  const sourceFile = ts.createSourceFile(fileName, content, ts.ScriptTarget.Latest, true);
+  const { osNamespaceOrDefault, namedTmpdir } = collectNodeOsImports(sourceFile);
+  const lines = [];
+
+  const visit = (node) => {
+    if (ts.isCallExpression(node)) {
+      const callee = unwrapExpression(node.expression);
+      if (
+        ts.isPropertyAccessExpression(callee) &&
+        callee.name.text === "tmpdir" &&
+        ts.isIdentifier(callee.expression) &&
+        osNamespaceOrDefault.has(callee.expression.text)
+      ) {
+        const line = sourceFile.getLineAndCharacterOfPosition(callee.getStart(sourceFile)).line + 1;
+        lines.push(line);
+      } else if (ts.isIdentifier(callee) && namedTmpdir.has(callee.text)) {
+        const line = sourceFile.getLineAndCharacterOfPosition(callee.getStart(sourceFile)).line + 1;
+        lines.push(line);
+      }
+    }
+    ts.forEachChild(node, visit);
+  };
+
+  visit(sourceFile);
+  return lines;
+}
+
+export async function main() {
+  const files = (
+    await Promise.all(sourceRoots.map(async (dir) => await collectTypeScriptFiles(dir)))
+  ).flat();
+  const violations = [];
+
+  for (const filePath of files) {
+    if (allowedCallsites.has(filePath)) {
+      continue;
+    }
+    const content = await fs.readFile(filePath, "utf8");
+    for (const line of findMessagingTmpdirCallLines(content, filePath)) {
+      violations.push(`${path.relative(repoRoot, filePath)}:${line}`);
+    }
+  }
+
+  if (violations.length === 0) {
+    return;
+  }
+
+  console.error("Found os.tmpdir()/tmpdir() usage in messaging/channel runtime sources:");
+  for (const violation of violations) {
+    console.error(`- ${violation}`);
+  }
+  console.error(
+    "Use resolvePreferredOpenClawTmpDir() or plugin-sdk temp helpers instead of host tmp defaults.",
+  );
+  process.exit(1);
+}
+
+const isDirectExecution = (() => {
+  const entry = process.argv[1];
+  if (!entry) {
+    return false;
+  }
+  return path.resolve(entry) === fileURLToPath(import.meta.url);
+})();
+
+if (isDirectExecution) {
+  main().catch((error) => {
+    console.error(error);
+    process.exit(1);
+  });
+}
diff --git a/src/agents/sandbox-paths.test.ts b/src/agents/sandbox-paths.test.ts
index de317320a80..6111980e138 100644
--- a/src/agents/sandbox-paths.test.ts
+++ b/src/agents/sandbox-paths.test.ts
@@ -3,6 +3,7 @@ import os from "node:os";
 import path from "node:path";
 import { pathToFileURL } from "node:url";
 import { describe, expect, it } from "vitest";
+import { resolvePreferredOpenClawTmpDir } from "../infra/tmp-openclaw-dir.js";
 import { resolveSandboxedMediaSource } from "./sandbox-paths.js";
 
 async function withSandboxRoot<T>(run: (sandboxDir: string) => Promise<T>) {
@@ -24,22 +25,24 @@ function isPathInside(root: string, target: string): boolean {
 }
 
 describe("resolveSandboxedMediaSource", () => {
+  const openClawTmpDir = resolvePreferredOpenClawTmpDir();
+
   // Group 1: /tmp paths (the bug fix)
   it.each([
     {
-      name: "absolute paths under os.tmpdir()",
-      media: path.join(os.tmpdir(), "image.png"),
-      expected: path.join(os.tmpdir(), "image.png"),
+      name: "absolute paths under preferred OpenClaw tmp root",
+      media: path.join(openClawTmpDir, "image.png"),
+      expected: path.join(openClawTmpDir, "image.png"),
     },
     {
-      name: "file:// URLs pointing to os.tmpdir()",
-      media: pathToFileURL(path.join(os.tmpdir(), "photo.png")).href,
-      expected: path.join(os.tmpdir(), "photo.png"),
+      name: "file:// URLs pointing to preferred OpenClaw tmp root",
+      media: pathToFileURL(path.join(openClawTmpDir, "photo.png")).href,
+      expected: path.join(openClawTmpDir, "photo.png"),
     },
     {
-      name: "nested paths under os.tmpdir()",
-      media: path.join(os.tmpdir(), "subdir", "deep", "file.png"),
-      expected: path.join(os.tmpdir(), "subdir", "deep", "file.png"),
+      name: "nested paths under preferred OpenClaw tmp root",
+      media: path.join(openClawTmpDir, "subdir", "deep", "file.png"),
+      expected: path.join(openClawTmpDir, "subdir", "deep", "file.png"),
     },
   ])("allows $name", async ({ media, expected }) => {
     await withSandboxRoot(async (sandboxDir) => {
@@ -96,7 +99,12 @@ describe("resolveSandboxedMediaSource", () => {
     },
     {
       name: "path traversal through tmpdir",
-      media: path.join(os.tmpdir(), "..", "etc", "passwd"),
+      media: path.join(openClawTmpDir, "..", "etc", "passwd"),
+      expected: /sandbox/i,
+    },
+    {
+      name: "absolute paths under host tmp outside openclaw tmp root",
+      media: path.join(os.tmpdir(), "outside-openclaw", "passwd"),
       expected: /sandbox/i,
     },
     {
@@ -120,20 +128,25 @@ describe("resolveSandboxedMediaSource", () => {
     });
   });
 
-  it("rejects symlinked tmpdir paths escaping tmpdir", async () => {
+  it("rejects symlinked OpenClaw tmp paths escaping tmp root", async () => {
     if (process.platform === "win32") {
       return;
     }
     const outsideTmpTarget = path.resolve(process.cwd(), "package.json");
-    if (isPathInside(os.tmpdir(), outsideTmpTarget)) {
+    if (isPathInside(openClawTmpDir, outsideTmpTarget)) {
       return;
     }
 
     await withSandboxRoot(async (sandboxDir) => {
       await fs.access(outsideTmpTarget);
-      const symlinkPath = path.join(sandboxDir, "tmp-link-escape");
+      await fs.mkdir(openClawTmpDir, { recursive: true });
+      const symlinkPath = path.join(openClawTmpDir, `tmp-link-escape-${process.pid}`);
       await fs.symlink(outsideTmpTarget, symlinkPath);
-      await expectSandboxRejection(symlinkPath, sandboxDir, /symlink|sandbox/i);
+      try {
+        await expectSandboxRejection(symlinkPath, sandboxDir, /symlink|sandbox/i);
+      } finally {
+        await fs.unlink(symlinkPath).catch(() => {});
+      }
     });
   });
 
diff --git a/src/agents/sandbox-paths.ts b/src/agents/sandbox-paths.ts
index 5b684bbe425..f5ae24ac16a 100644
--- a/src/agents/sandbox-paths.ts
+++ b/src/agents/sandbox-paths.ts
@@ -3,6 +3,7 @@ import os from "node:os";
 import path from "node:path";
 import { fileURLToPath, URL } from "node:url";
 import { isNotFoundPathError, isPathInside } from "../infra/path-guards.js";
+import { resolvePreferredOpenClawTmpDir } from "../infra/tmp-openclaw-dir.js";
 
 const UNICODE_SPACES = /[\u00A0\u2000-\u200A\u202F\u205F\u3000]/g;
 const HTTP_URL_RE = /^https?:\/\//i;
@@ -181,11 +182,11 @@ async function resolveAllowedTmpMediaPath(params: {
     return undefined;
   }
   const resolved = path.resolve(resolveSandboxInputPath(params.candidate, params.sandboxRoot));
-  const tmpDir = path.resolve(os.tmpdir());
-  if (!isPathInside(tmpDir, resolved)) {
+  const openClawTmpDir = path.resolve(resolvePreferredOpenClawTmpDir());
+  if (!isPathInside(openClawTmpDir, resolved)) {
     return undefined;
   }
-  await assertNoSymlinkEscape(path.relative(tmpDir, resolved), tmpDir);
+  await assertNoSymlinkEscape(path.relative(openClawTmpDir, resolved), openClawTmpDir);
   return resolved;
 }
 
diff --git a/src/infra/outbound/deliver.test.ts b/src/infra/outbound/deliver.test.ts
index c39d966b804..94b5bee9891 100644
--- a/src/infra/outbound/deliver.test.ts
+++ b/src/infra/outbound/deliver.test.ts
@@ -11,6 +11,7 @@ import { createOutboundTestPlugin, createTestRegistry } from "../../test-utils/c
 import { withEnvAsync } from "../../test-utils/env.js";
 import { createIMessageTestPlugin } from "../../test-utils/imessage-test-plugin.js";
 import { createInternalHookEventPayload } from "../../test-utils/internal-hook-event-payload.js";
+import { resolvePreferredOpenClawTmpDir } from "../tmp-openclaw-dir.js";
 
 const mocks = vi.hoisted(() => ({
   appendAssistantMessageToSessionTranscript: vi.fn(async () => ({ ok: true, sessionFile: "x" })),
@@ -202,6 +203,86 @@ describe("deliverOutboundPayloads", () => {
     );
   });
 
+  it("includes OpenClaw tmp root in telegram mediaLocalRoots", async () => {
+    const sendTelegram = vi.fn().mockResolvedValue({ messageId: "m1", chatId: "c1" });
+
+    await deliverOutboundPayloads({
+      cfg: telegramChunkConfig,
+      channel: "telegram",
+      to: "123",
+      payloads: [{ text: "hi", mediaUrl: "https://example.com/x.png" }],
+      deps: { sendTelegram },
+    });
+
+    expect(sendTelegram).toHaveBeenCalledWith(
+      "123",
+      "hi",
+      expect.objectContaining({
+        mediaLocalRoots: expect.arrayContaining([resolvePreferredOpenClawTmpDir()]),
+      }),
+    );
+  });
+
+  it("includes OpenClaw tmp root in signal mediaLocalRoots", async () => {
+    const sendSignal = vi.fn().mockResolvedValue({ messageId: "s1", timestamp: 123 });
+
+    await deliverOutboundPayloads({
+      cfg: { channels: { signal: {} } },
+      channel: "signal",
+      to: "+1555",
+      payloads: [{ text: "hi", mediaUrl: "https://example.com/x.png" }],
+      deps: { sendSignal },
+    });
+
+    expect(sendSignal).toHaveBeenCalledWith(
+      "+1555",
+      "hi",
+      expect.objectContaining({
+        mediaLocalRoots: expect.arrayContaining([resolvePreferredOpenClawTmpDir()]),
+      }),
+    );
+  });
+
+  it("includes OpenClaw tmp root in whatsapp mediaLocalRoots", async () => {
+    const sendWhatsApp = vi.fn().mockResolvedValue({ messageId: "w1", toJid: "jid" });
+
+    await deliverOutboundPayloads({
+      cfg: whatsappChunkConfig,
+      channel: "whatsapp",
+      to: "+1555",
+      payloads: [{ text: "hi", mediaUrl: "https://example.com/x.png" }],
+      deps: { sendWhatsApp },
+    });
+
+    expect(sendWhatsApp).toHaveBeenCalledWith(
+      "+1555",
+      "hi",
+      expect.objectContaining({
+        mediaLocalRoots: expect.arrayContaining([resolvePreferredOpenClawTmpDir()]),
+      }),
+    );
+  });
+
+  it("includes OpenClaw tmp root in imessage mediaLocalRoots", async () => {
+    const sendIMessage = vi.fn().mockResolvedValue({ messageId: "i1", chatId: "chat-1" });
+
+    await deliverOutboundPayloads({
+      cfg: {},
+      channel: "imessage",
+      to: "imessage:+15551234567",
+      payloads: [{ text: "hi", mediaUrl: "https://example.com/x.png" }],
+      deps: { sendIMessage },
+    });
+
+    expect(sendIMessage).toHaveBeenCalledWith(
+      "imessage:+15551234567",
+      "hi",
+      expect.objectContaining({
+        mediaLocalRoots: expect.arrayContaining([resolvePreferredOpenClawTmpDir()]),
+      }),
+    );
+  });
+
   it("uses signal media maxBytes from config", async () => {
     const sendSignal = vi.fn().mockResolvedValue({ messageId: "s1", timestamp: 123 });
     const cfg: OpenClawConfig = { channels: { signal: { mediaMaxMb: 2 } } };
diff --git a/src/infra/outbound/message-action-runner.test.ts b/src/infra/outbound/message-action-runner.test.ts
index f2c36464e97..26591ff23c9 100644
--- a/src/infra/outbound/message-action-runner.test.ts
+++ b/src/infra/outbound/message-action-runner.test.ts
@@ -12,6 +12,7 @@ import { setActivePluginRegistry } from "../../plugins/runtime.js";
 import { createOutboundTestPlugin, createTestRegistry } from "../../test-utils/channel-plugins.js";
 import { createIMessageTestPlugin } from "../../test-utils/imessage-test-plugin.js";
 import { loadWebMedia } from "../../web/media.js";
+import { resolvePreferredOpenClawTmpDir } from "../tmp-openclaw-dir.js";
 import { runMessageAction } from "./message-action-runner.js";
 
 vi.mock("../../web/media.js", async () => {
@@ -622,10 +623,12 @@ describe("runMessageAction sandboxed media validation", () => {
     });
   });
 
-  it("allows media paths under os.tmpdir()", async () => {
+  it("allows media paths under preferred OpenClaw tmp root", async () => {
+    const tmpRoot = resolvePreferredOpenClawTmpDir();
+    await fs.mkdir(tmpRoot, { recursive: true });
     const sandboxDir = await fs.mkdtemp(path.join(os.tmpdir(), "msg-sandbox-"));
     try {
-      const tmpFile = path.join(os.tmpdir(), "test-media-image.png");
+      const tmpFile = path.join(tmpRoot, "test-media-image.png");
       const result = await runMessageAction({
         cfg: slackConfig,
         action: "send",
@@ -644,6 +647,21 @@ describe("runMessageAction sandboxed media validation", () => {
         throw new Error("expected send result");
       }
       expect(result.sendResult?.mediaUrl).toBe(tmpFile);
+      const hostTmpOutsideOpenClaw = path.join(os.tmpdir(), "outside-openclaw", "test-media.png");
+      await expect(
+        runMessageAction({
+          cfg: slackConfig,
+          action: "send",
+          params: {
+            channel: "slack",
+            target: "#C12345678",
+            media: hostTmpOutsideOpenClaw,
+            message: "",
+          },
+          sandboxRoot: sandboxDir,
+          dryRun: true,
+        }),
+      ).rejects.toThrow(/sandbox/i);
     } finally {
       await fs.rm(sandboxDir, { recursive: true, force: true });
     }
diff --git a/src/media-understanding/runner.entries.ts b/src/media-understanding/runner.entries.ts
index 3e80caae9bc..36e6a89b438 100644
--- a/src/media-understanding/runner.entries.ts
+++ b/src/media-understanding/runner.entries.ts
@@ -1,5 +1,4 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import {
   collectProviderApiKeysForExecution,
@@ -14,6 +13,7 @@ import type {
   MediaUnderstandingModelConfig,
 } from "../config/types.tools.js";
 import { logVerbose, shouldLogVerbose } from "../globals.js";
+import { resolvePreferredOpenClawTmpDir } from "../infra/tmp-openclaw-dir.js";
 import { runExec } from "../process/exec.js";
 import { MediaAttachmentCache } from "./attachments.js";
 import {
@@ -566,7 +566,9 @@ export async function runCliEntry(params: {
     maxBytes,
     timeoutMs,
   });
-  const outputDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-media-cli-"));
+  const outputDir = await fs.mkdtemp(
+    path.join(resolvePreferredOpenClawTmpDir(), "openclaw-media-cli-"),
+  );
   const mediaPath = pathResult.path;
   const outputBase = path.join(outputDir, path.parse(mediaPath).name);
 
diff --git a/src/plugin-sdk/index.ts b/src/plugin-sdk/index.ts
index 461370054b0..9c54fe175f6 100644
--- a/src/plugin-sdk/index.ts
+++ b/src/plugin-sdk/index.ts
@@ -200,6 +200,7 @@ export { createLoggerBackedRuntime } from "./runtime.js";
 export { chunkTextForOutbound } from "./text-chunking.js";
 export { readJsonFileWithFallback, writeJsonFileAtomically } from "./json-store.js";
 export { buildRandomTempFilePath, withTempDownloadPath } from "./temp-path.js";
+export { resolvePreferredOpenClawTmpDir } from "../infra/tmp-openclaw-dir.js";
 export {
   runPluginCommandWithTimeout,
   type PluginCommandRunOptions,
diff --git a/src/plugin-sdk/temp-path.test.ts b/src/plugin-sdk/temp-path.test.ts
index dbd2d46ee0f..166a2373b15 100644
--- a/src/plugin-sdk/temp-path.test.ts
+++ b/src/plugin-sdk/temp-path.test.ts
@@ -1,7 +1,7 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import { describe, expect, it } from "vitest";
+import { resolvePreferredOpenClawTmpDir } from "../infra/tmp-openclaw-dir.js";
 import { buildRandomTempFilePath, withTempDownloadPath } from "./temp-path.js";
 
 describe("buildRandomTempFilePath", () => {
@@ -17,13 +17,13 @@ describe("buildRandomTempFilePath", () => {
   });
 
   it("sanitizes prefix and extension to avoid path traversal segments", () => {
+    const tmpRoot = path.resolve(resolvePreferredOpenClawTmpDir());
     const result = buildRandomTempFilePath({
       prefix: "../../line/../media",
       extension: "/../.jpg",
       now: 123,
       uuid: "abc",
     });
-    const tmpRoot = path.resolve(os.tmpdir());
     const resolved = path.resolve(result);
     const rel = path.relative(tmpRoot, resolved);
     expect(rel === ".." || rel.startsWith(`..${path.sep}`)).toBe(false);
@@ -45,11 +45,12 @@ describe("withTempDownloadPath", () => {
       },
     );
 
-    expect(capturedPath).toContain(path.join(os.tmpdir(), "line-media-"));
+    expect(capturedPath).toContain(path.join(resolvePreferredOpenClawTmpDir(), "line-media-"));
     await expect(fs.stat(capturedPath)).rejects.toMatchObject({ code: "ENOENT" });
   });
 
   it("sanitizes prefix and fileName", async () => {
+    const tmpRoot = path.resolve(resolvePreferredOpenClawTmpDir());
     let capturedPath = "";
     await withTempDownloadPath(
       {
@@ -61,7 +62,6 @@ describe("withTempDownloadPath", () => {
       },
     );
 
-    const tmpRoot = path.resolve(os.tmpdir());
     const resolved = path.resolve(capturedPath);
     const rel = path.relative(tmpRoot, resolved);
     expect(rel === ".." || rel.startsWith(`..${path.sep}`)).toBe(false);
diff --git a/src/plugin-sdk/temp-path.ts b/src/plugin-sdk/temp-path.ts
index ed1b149135a..f0ca73b2109 100644
--- a/src/plugin-sdk/temp-path.ts
+++ b/src/plugin-sdk/temp-path.ts
@@ -1,7 +1,7 @@
 import crypto from "node:crypto";
 import { mkdtemp, rm } from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
+import { resolvePreferredOpenClawTmpDir } from "../infra/tmp-openclaw-dir.js";
 
 function sanitizePrefix(prefix: string): string {
   const normalized = prefix.replace(/[^a-zA-Z0-9_-]+/g, "-").replace(/^-+|-+$/g, "");
@@ -27,6 +27,10 @@ function sanitizeFileName(fileName: string): string {
   return normalized || "download.bin";
 }
 
+function resolveTempRoot(tmpDir?: string): string {
+  return tmpDir ?? resolvePreferredOpenClawTmpDir();
+}
+
 export function buildRandomTempFilePath(params: {
   prefix: string;
   extension?: string;
@@ -42,7 +46,7 @@ export function buildRandomTempFilePath(params: {
       ? Math.trunc(nowCandidate)
       : Date.now();
   const uuid = params.uuid?.trim() || crypto.randomUUID();
-  return path.join(params.tmpDir ?? os.tmpdir(), `${prefix}-${now}-${uuid}${extension}`);
+  return path.join(resolveTempRoot(params.tmpDir), `${prefix}-${now}-${uuid}${extension}`);
 }
 
 export async function withTempDownloadPath<T>(
@@ -53,7 +57,7 @@ export async function withTempDownloadPath<T>(
   },
   fn: (tmpPath: string) => Promise<T>,
 ): Promise<T> {
-  const tempRoot = params.tmpDir ?? os.tmpdir();
+  const tempRoot = resolveTempRoot(params.tmpDir);
   const prefix = `${sanitizePrefix(params.prefix)}-`;
   const dir = await mkdtemp(path.join(tempRoot, prefix));
   const tmpPath = path.join(dir, sanitizeFileName(params.fileName ?? "download.bin"));
diff --git a/test/scripts/check-no-random-messaging-tmp.test.ts b/test/scripts/check-no-random-messaging-tmp.test.ts
new file mode 100644
index 00000000000..01495b2b09b
--- /dev/null
+++ b/test/scripts/check-no-random-messaging-tmp.test.ts
@@ -0,0 +1,36 @@
+import { describe, expect, it } from "vitest";
+import { findMessagingTmpdirCallLines } from "../../scripts/check-no-random-messaging-tmp.mjs";
+
+describe("check-no-random-messaging-tmp", () => {
+  it("finds os.tmpdir calls imported from node:os", () => {
+    const source = `
+      import os from "node:os";
+      const dir = os.tmpdir();
+    `;
+    expect(findMessagingTmpdirCallLines(source)).toEqual([3]);
+  });
+
+  it("finds tmpdir named import calls from node:os", () => {
+    const source = `
+      import { tmpdir } from "node:os";
+      const dir = tmpdir();
+    `;
+    expect(findMessagingTmpdirCallLines(source)).toEqual([3]);
+  });
+
+  it("ignores mentions in comments and strings", () => {
+    const source = `
+      // os.tmpdir()
+      const text = "tmpdir()";
+    `;
+    expect(findMessagingTmpdirCallLines(source)).toEqual([]);
+  });
+
+  it("ignores tmpdir symbols that are not imported from node:os", () => {
+    const source = `
+      const tmpdir = () => "/tmp";
+      const dir = tmpdir();
+    `;
+    expect(findMessagingTmpdirCallLines(source)).toEqual([]);
+  });
+});