diff --git a/openclaw.mjs b/openclaw.mjs
index 686593fb22..6649f4e81c 100755
--- a/openclaw.mjs
+++ b/openclaw.mjs
@@ -11,13 +11,36 @@ if (module.enableCompileCache && !process.env.NODE_DISABLE_COMPILE_CACHE) {
   }
 }
 
+const isModuleNotFoundError = (err) =>
+  err && typeof err === "object" && "code" in err && err.code === "ERR_MODULE_NOT_FOUND";
+
+const installProcessWarningFilter = async () => {
+  // Keep bootstrap warnings consistent with the TypeScript runtime.
+  for (const specifier of ["./dist/warning-filter.js", "./dist/warning-filter.mjs"]) {
+    try {
+      const mod = await import(specifier);
+      if (typeof mod.installProcessWarningFilter === "function") {
+        mod.installProcessWarningFilter();
+        return;
+      }
+    } catch (err) {
+      if (isModuleNotFoundError(err)) {
+        continue;
+      }
+      throw err;
+    }
+  }
+};
+
+await installProcessWarningFilter();
+
 const tryImport = async (specifier) => {
   try {
     await import(specifier);
     return true;
   } catch (err) {
     // Only swallow missing-module errors; rethrow real runtime errors.
-    if (err && typeof err === "object" && "code" in err && err.code === "ERR_MODULE_NOT_FOUND") {
+    if (isModuleNotFoundError(err)) {
       return false;
     }
     throw err;
diff --git a/src/infra/warning-filter.test.ts b/src/infra/warning-filter.test.ts
new file mode 100644
index 0000000000..8220037d95
--- /dev/null
+++ b/src/infra/warning-filter.test.ts
@@ -0,0 +1,89 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { installProcessWarningFilter, shouldIgnoreWarning } from "./warning-filter.js";
+
+const warningFilterKey = Symbol.for("openclaw.warning-filter");
+
+function resetWarningFilterInstallState(): void {
+  const globalState = globalThis as typeof globalThis & {
+    [warningFilterKey]?: { installed: boolean };
+  };
+  delete globalState[warningFilterKey];
+}
+
+describe("warning filter", () => {
+  beforeEach(() => {
+    resetWarningFilterInstallState();
+  });
+
+  afterEach(() => {
+    resetWarningFilterInstallState();
+    vi.restoreAllMocks();
+  });
+
+  it("suppresses known deprecation and experimental warning signatures", () => {
+    expect(
+      shouldIgnoreWarning({
+        name: "DeprecationWarning",
+        code: "DEP0040",
+        message: "The punycode module is deprecated.",
+      }),
+    ).toBe(true);
+    expect(
+      shouldIgnoreWarning({
+        name: "DeprecationWarning",
+        code: "DEP0060",
+        message: "The `util._extend` API is deprecated.",
+      }),
+    ).toBe(true);
+    expect(
+      shouldIgnoreWarning({
+        name: "ExperimentalWarning",
+        message: "SQLite is an experimental feature and might change at any time",
+      }),
+    ).toBe(true);
+  });
+
+  it("keeps unknown warnings visible", () => {
+    expect(
+      shouldIgnoreWarning({
+        name: "DeprecationWarning",
+        code: "DEP9999",
+        message: "Totally new warning",
+      }),
+    ).toBe(false);
+  });
+
+  it("installs once and only writes unsuppressed warnings", () => {
+    let warningHandler: ((warning: Error & { code?: string; message?: string }) => void) | null =
+      null;
+    const onSpy = vi.spyOn(process, "on").mockImplementation(((event, handler) => {
+      if (event === "warning") {
+        warningHandler = handler as (warning: Error & { code?: string; message?: string }) => void;
+      }
+      return process;
+    }) as typeof process.on);
+    const writeSpy = vi.spyOn(process.stderr, "write").mockImplementation(() => true);
+
+    installProcessWarningFilter();
+    installProcessWarningFilter();
+
+    expect(onSpy).toHaveBeenCalledTimes(1);
+    expect(warningHandler).not.toBeNull();
+
+    warningHandler?.({
+      name: "DeprecationWarning",
+      code: "DEP0060",
+      message: "The `util._extend` API is deprecated.",
+      toString: () => "suppressed",
+    } as Error & { code?: string; message?: string });
+    expect(writeSpy).not.toHaveBeenCalled();
+
+    warningHandler?.({
+      name: "Warning",
+      message: "Visible warning",
+      stack: "Warning: visible",
+      toString: () => "visible",
+    } as Error & { code?: string; message?: string });
+    expect(writeSpy).toHaveBeenCalledWith("Warning: visible\n");
+  });
+});
diff --git a/src/infra/warning-filter.ts b/src/infra/warning-filter.ts
new file mode 100644
index 0000000000..68af7ad5d3
--- /dev/null
+++ b/src/infra/warning-filter.ts
@@ -0,0 +1,40 @@
+const warningFilterKey = Symbol.for("openclaw.warning-filter");
+
+export type ProcessWarning = Error & {
+  code?: string;
+  name?: string;
+  message?: string;
+};
+
+export function shouldIgnoreWarning(warning: ProcessWarning): boolean {
+  if (warning.code === "DEP0040" && warning.message?.includes("punycode")) {
+    return true;
+  }
+  if (warning.code === "DEP0060" && warning.message?.includes("util._extend")) {
+    return true;
+  }
+  if (
+    warning.name === "ExperimentalWarning" &&
+    warning.message?.includes("SQLite is an experimental feature")
+  ) {
+    return true;
+  }
+  return false;
+}
+
+export function installProcessWarningFilter(): void {
+  const globalState = globalThis as typeof globalThis & {
+    [warningFilterKey]?: { installed: boolean };
+  };
+  if (globalState[warningFilterKey]?.installed) {
+    return;
+  }
+  globalState[warningFilterKey] = { installed: true };
+
+  process.on("warning", (warning: ProcessWarning) => {
+    if (shouldIgnoreWarning(warning)) {
+      return;
+    }
+    process.stderr.write(`${warning.stack ?? warning.toString()}\n`);
+  });
+}
diff --git a/src/infra/warnings.ts b/src/infra/warnings.ts
index 91a98b0f32..e8b048ddb9 100644
--- a/src/infra/warnings.ts
+++ b/src/infra/warnings.ts
@@ -1,40 +1 @@
-const warningFilterKey = Symbol.for("openclaw.warning-filter");
-
-type Warning = Error & {
-  code?: string;
-  name?: string;
-  message?: string;
-};
-
-function shouldIgnoreWarning(warning: Warning): boolean {
-  if (warning.code === "DEP0040" && warning.message?.includes("punycode")) {
-    return true;
-  }
-  if (warning.code === "DEP0060" && warning.message?.includes("util._extend")) {
-    return true;
-  }
-  if (
-    warning.name === "ExperimentalWarning" &&
-    warning.message?.includes("SQLite is an experimental feature")
-  ) {
-    return true;
-  }
-  return false;
-}
-
-export function installProcessWarningFilter(): void {
-  const globalState = globalThis as typeof globalThis & {
-    [warningFilterKey]?: { installed: boolean };
-  };
-  if (globalState[warningFilterKey]?.installed) {
-    return;
-  }
-  globalState[warningFilterKey] = { installed: true };
-
-  process.on("warning", (warning: Warning) => {
-    if (shouldIgnoreWarning(warning)) {
-      return;
-    }
-    process.stderr.write(`${warning.stack ?? warning.toString()}\n`);
-  });
-}
+export { installProcessWarningFilter } from "./warning-filter.js";
diff --git a/tsdown.config.ts b/tsdown.config.ts
index d4c11bd53f..232ab79592 100644
--- a/tsdown.config.ts
+++ b/tsdown.config.ts
@@ -17,6 +17,12 @@ export default defineConfig([
     fixedExtension: false,
     platform: "node",
   },
+  {
+    entry: "src/infra/warning-filter.ts",
+    env,
+    fixedExtension: false,
+    platform: "node",
+  },
   {
     entry: "src/plugin-sdk/index.ts",
     outDir: "dist/plugin-sdk",