diff --git a/scripts/docker-e2e-rerun.mjs b/scripts/docker-e2e-rerun.mjs
index bb4d92c147de..2a5833e75d92 100644
--- a/scripts/docker-e2e-rerun.mjs
+++ b/scripts/docker-e2e-rerun.mjs
@@ -8,6 +8,7 @@ import { spawnSync } from "node:child_process";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
+import { readDockerE2eJsonArtifact } from "./lib/docker-e2e-json-artifacts.mjs";
 
 const DEFAULT_WORKFLOW = "openclaw-live-and-e2e-checks-reusable.yml";
 
@@ -76,7 +77,7 @@ function run(command, args, options = {}) {
 }
 
 function readJson(file) {
-  return JSON.parse(fs.readFileSync(file, "utf8"));
+  return readDockerE2eJsonArtifact(file);
 }
 
 function shellQuote(value) {
diff --git a/scripts/docker-e2e-timings.mjs b/scripts/docker-e2e-timings.mjs
index 968cddaf1dfd..96487821c770 100644
--- a/scripts/docker-e2e-timings.mjs
+++ b/scripts/docker-e2e-timings.mjs
@@ -2,12 +2,9 @@
 // Summarizes Docker E2E timing artifacts.
 // Accepts scheduler summary.json or lane-timings.json so agents can see the
 // slowest lanes and phase critical path before deciding what to rerun.
-import fs from "node:fs";
+import { readDockerE2eJsonArtifact } from "./lib/docker-e2e-json-artifacts.mjs";
 import { parsePositiveInt } from "./lib/numeric-options.mjs";
 
-const JSON_ARTIFACT_MAX_BYTES_ENV = "OPENCLAW_DOCKER_E2E_JSON_ARTIFACT_MAX_BYTES";
-const DEFAULT_JSON_ARTIFACT_MAX_BYTES = 16 * 1024 * 1024;
-
 function usage() {
   return "Usage: node scripts/docker-e2e-timings.mjs <summary.json|lane-timings.json> [--limit N]";
 }
@@ -44,29 +41,7 @@ function parseArgs(argv) {
 }
 
 function readJson(file) {
-  return JSON.parse(readJsonArtifactText(file));
-}
-
-function readJsonArtifactText(file) {
-  const maxBytes = readPositiveIntEnv(JSON_ARTIFACT_MAX_BYTES_ENV, DEFAULT_JSON_ARTIFACT_MAX_BYTES);
-  const stat = fs.statSync(file);
-  if (!stat.isFile()) {
-    throw new Error(`JSON artifact is not a file: ${file}`);
-  }
-  if (stat.size > maxBytes) {
-    throw new Error(`JSON artifact exceeded ${maxBytes} bytes: ${file} (${stat.size} bytes)`);
-  }
-  const text = fs.readFileSync(file, "utf8");
-  const bytes = Buffer.byteLength(text, "utf8");
-  if (bytes > maxBytes) {
-    throw new Error(`JSON artifact exceeded ${maxBytes} bytes: ${file} (${bytes} bytes)`);
-  }
-  return text;
-}
-
-function readPositiveIntEnv(name, fallback) {
-  const raw = process.env[name];
-  return raw === undefined || raw === "" ? fallback : parsePositiveInt(raw, name);
+  return readDockerE2eJsonArtifact(file);
 }
 
 function seconds(value) {
diff --git a/scripts/docker-e2e.mjs b/scripts/docker-e2e.mjs
index df3f409bc334..f67db1c8b350 100644
--- a/scripts/docker-e2e.mjs
+++ b/scripts/docker-e2e.mjs
@@ -1,11 +1,7 @@
 // Docker E2E CI helper.
 // Converts scheduler JSON into GitHub Actions outputs and compact markdown
 // summaries so the workflow does not duplicate Docker E2E planning logic.
-import fs from "node:fs";
-import { parsePositiveInt } from "./lib/numeric-options.mjs";
-
-const JSON_ARTIFACT_MAX_BYTES_ENV = "OPENCLAW_DOCKER_E2E_JSON_ARTIFACT_MAX_BYTES";
-const DEFAULT_JSON_ARTIFACT_MAX_BYTES = 16 * 1024 * 1024;
+import { readDockerE2eJsonArtifact } from "./lib/docker-e2e-json-artifacts.mjs";
 
 function usage() {
   return [
@@ -17,29 +13,7 @@ function usage() {
 }
 
 function readJson(file) {
-  return JSON.parse(readJsonArtifactText(file));
-}
-
-function readJsonArtifactText(file) {
-  const maxBytes = readPositiveIntEnv(JSON_ARTIFACT_MAX_BYTES_ENV, DEFAULT_JSON_ARTIFACT_MAX_BYTES);
-  const stat = fs.statSync(file);
-  if (!stat.isFile()) {
-    throw new Error(`JSON artifact is not a file: ${file}`);
-  }
-  if (stat.size > maxBytes) {
-    throw new Error(`JSON artifact exceeded ${maxBytes} bytes: ${file} (${stat.size} bytes)`);
-  }
-  const text = fs.readFileSync(file, "utf8");
-  const bytes = Buffer.byteLength(text, "utf8");
-  if (bytes > maxBytes) {
-    throw new Error(`JSON artifact exceeded ${maxBytes} bytes: ${file} (${bytes} bytes)`);
-  }
-  return text;
-}
-
-function readPositiveIntEnv(name, fallback) {
-  const raw = process.env[name];
-  return raw === undefined || raw === "" ? fallback : parsePositiveInt(raw, name);
+  return readDockerE2eJsonArtifact(file);
 }
 
 function boolOutput(value) {
diff --git a/scripts/lib/docker-e2e-json-artifacts.mjs b/scripts/lib/docker-e2e-json-artifacts.mjs
new file mode 100644
index 000000000000..a62ce03e177b
--- /dev/null
+++ b/scripts/lib/docker-e2e-json-artifacts.mjs
@@ -0,0 +1,31 @@
+import fs from "node:fs";
+import { parsePositiveInt } from "./numeric-options.mjs";
+
+const JSON_ARTIFACT_MAX_BYTES_ENV = "OPENCLAW_DOCKER_E2E_JSON_ARTIFACT_MAX_BYTES";
+const DEFAULT_JSON_ARTIFACT_MAX_BYTES = 16 * 1024 * 1024;
+
+export function readDockerE2eJsonArtifact(file) {
+  return JSON.parse(readDockerE2eJsonArtifactText(file));
+}
+
+function readDockerE2eJsonArtifactText(file) {
+  const maxBytes = readPositiveIntEnv(JSON_ARTIFACT_MAX_BYTES_ENV, DEFAULT_JSON_ARTIFACT_MAX_BYTES);
+  const stat = fs.statSync(file);
+  if (!stat.isFile()) {
+    throw new Error(`JSON artifact is not a file: ${file}`);
+  }
+  if (stat.size > maxBytes) {
+    throw new Error(`JSON artifact exceeded ${maxBytes} bytes: ${file} (${stat.size} bytes)`);
+  }
+  const text = fs.readFileSync(file, "utf8");
+  const bytes = Buffer.byteLength(text, "utf8");
+  if (bytes > maxBytes) {
+    throw new Error(`JSON artifact exceeded ${maxBytes} bytes: ${file} (${bytes} bytes)`);
+  }
+  return text;
+}
+
+function readPositiveIntEnv(name, fallback) {
+  const raw = process.env[name];
+  return raw === undefined || raw === "" ? fallback : parsePositiveInt(raw, name);
+}
diff --git a/test/scripts/docker-e2e-helper-cli.test.ts b/test/scripts/docker-e2e-helper-cli.test.ts
index c2db152c83a5..232db1477a9e 100644
--- a/test/scripts/docker-e2e-helper-cli.test.ts
+++ b/test/scripts/docker-e2e-helper-cli.test.ts
@@ -122,6 +122,26 @@ describe("Docker E2E helper CLIs", () => {
     );
   });
 
+  it("rejects oversized rerun JSON artifacts without a Node stack trace", () => {
+    const root = mkdtempSync(`${tmpdir()}/openclaw-docker-e2e-rerun-`);
+    try {
+      const file = path.join(root, "summary.json");
+      writeFileSync(file, `${JSON.stringify({ filler: "x".repeat(128) })}\n`, "utf8");
+
+      const result = runHelper("scripts/docker-e2e-rerun.mjs", file, "--ref", "abc123", {
+        OPENCLAW_DOCKER_E2E_JSON_ARTIFACT_MAX_BYTES: "64",
+      });
+
+      expect(result.status).toBe(1);
+      expect(result.stdout).toBe("");
+      expect(result.stderr).toContain("JSON artifact exceeded 64 bytes");
+      expect(result.stderr).not.toContain("Error:");
+      expect(result.stderr).not.toContain("at file:");
+    } finally {
+      rmSync(root, { force: true, recursive: true });
+    }
+  });
+
   it.each(["summary.json", "failures.json"])(
     "prints local cleanup reruns without synthesizing Docker lane reruns from %s",
     (fileName) => {