diff --git a/scripts/check-extension-package-tsc-boundary.mjs b/scripts/check-extension-package-tsc-boundary.mjs
index 910ec8ea0b33..fd10fa55a698 100644
--- a/scripts/check-extension-package-tsc-boundary.mjs
+++ b/scripts/check-extension-package-tsc-boundary.mjs
@@ -37,6 +37,7 @@ const FAILURE_OUTPUT_TAIL_LINES = 40;
 const STEP_OUTPUT_MAX_CHARS = 256 * 1024;
 const STEP_PROCESS_GROUP_EXIT_POLL_MS = 25;
 const STEP_POST_FORCE_KILL_WAIT_MS = 1_000;
+const MAX_TIMER_TIMEOUT_MS = 2_147_000_000;
 const SLOW_COMPILE_SUMMARY_LIMIT = 10;
 const COMPILE_INPUT_EXTENSIONS = new Set([".ts", ".tsx", ".mts", ".cts", ".js", ".mjs", ".json"]);
 const ROOTDIR_BOUNDARY_CANARY_IMPORT_PATH =
@@ -337,13 +338,22 @@ function writeStampFile(filePath) {
   writeFileSync(filePath, `${new Date().toISOString()}\n`, "utf8");
 }
 
+function resolveStepTimerTimeoutMs(valueMs) {
+  const value = Number(valueMs);
+  if (!Number.isFinite(value)) {
+    return MAX_TIMER_TIMEOUT_MS;
+  }
+  return Math.min(Math.max(Math.floor(value), 1), MAX_TIMER_TIMEOUT_MS);
+}
+
 function runNodeStep(label, args, timeoutMs) {
+  const resolvedTimeoutMs = resolveStepTimerTimeoutMs(timeoutMs);
   const startedAt = Date.now();
   const result = spawnSync(process.execPath, args, {
     cwd: repoRoot,
     encoding: "utf8",
     maxBuffer: 16 * 1024 * 1024,
-    timeout: timeoutMs,
+    timeout: resolvedTimeoutMs,
   });
 
   if (result.status === 0 && !result.error) {
@@ -352,7 +362,7 @@ function runNodeStep(label, args, timeoutMs) {
 
   const timeoutSuffix =
     result.error?.name === "Error" && result.error.message.includes("ETIMEDOUT")
-      ? `${label} timed out after ${timeoutMs}ms`
+      ? `${label} timed out after ${resolvedTimeoutMs}ms`
       : "";
   const errorSuffix = result.error ? result.error.message : "";
   const note = [timeoutSuffix, errorSuffix].filter(Boolean).join("\n");
@@ -391,6 +401,7 @@ function abortSiblingSteps(abortController) {
  * Runs one node-based boundary check step with timeout and output capture.
  */
 export function runNodeStepAsync(label, args, timeoutMs, params = {}) {
+  const resolvedTimeoutMs = resolveStepTimerTimeoutMs(timeoutMs);
   const abortController = params.abortController;
   const killProcess = params.killProcess ?? process.kill.bind(process);
   const onFailure = params.onFailure;
@@ -499,7 +510,7 @@ export function runNodeStepAsync(label, args, timeoutMs, params = {}) {
               stderr: stderrText,
               kind: "timeout",
               elapsedMs: Date.now() - startedAt,
-              note: `${label} timed out after ${timeoutMs}ms`,
+              note: `${label} timed out after ${resolvedTimeoutMs}ms`,
             }),
           ),
           label,
@@ -508,14 +519,14 @@ export function runNodeStepAsync(label, args, timeoutMs, params = {}) {
             stderr: stderrText,
             kind: "timeout",
             elapsedMs: Date.now() - startedAt,
-            note: `${label} timed out after ${timeoutMs}ms`,
+            note: `${label} timed out after ${resolvedTimeoutMs}ms`,
           },
         );
         onFailure?.(error);
         abortSiblingSteps(abortController);
         rejectPromise(toLintErrorObject(error, "Step timed out"));
       })();
-    }, timeoutMs);
+    }, resolvedTimeoutMs);
 
     child.stdout.setEncoding("utf8");
     child.stderr.setEncoding("utf8");
diff --git a/test/scripts/check-extension-package-tsc-boundary.test.ts b/test/scripts/check-extension-package-tsc-boundary.test.ts
index 54d53ee6b18a..04df853da310 100644
--- a/test/scripts/check-extension-package-tsc-boundary.test.ts
+++ b/test/scripts/check-extension-package-tsc-boundary.test.ts
@@ -5,6 +5,7 @@ import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
 import { pathToFileURL } from "node:url";
+import { MAX_TIMER_TIMEOUT_MS } from "@openclaw/normalization-core/number-coercion";
 import { afterEach, describe, expect, it } from "vitest";
 import {
   acquireBoundaryCheckLock,
@@ -432,6 +433,19 @@ describe("check-extension-package-tsc-boundary", () => {
     expect(elapsedMs).toBeGreaterThanOrEqual(0);
   }, 30_000);
 
+  it("clamps oversized async node step timers before scheduling", async () => {
+    await expect(
+      runNodeStepAsync(
+        "slow-success",
+        ["--eval", "setTimeout(() => process.exit(0), 25);"],
+        MAX_TIMER_TIMEOUT_MS + 1,
+      ),
+    ).resolves.toMatchObject({
+      stderr: "",
+      stdout: "",
+    });
+  });
+
   it("keeps async node step failure output bounded", async () => {
     const child = new EventEmitter() as EventEmitter & {
       kill: (signal?: NodeJS.Signals | number) => boolean;