diff --git a/extensions/qa-lab/src/artifact-assertion.ts b/extensions/qa-lab/src/artifact-assertion.ts
new file mode 100644
index 000000000000..930a73cd89ba
--- /dev/null
+++ b/extensions/qa-lab/src/artifact-assertion.ts
@@ -0,0 +1,18 @@
+import fs from "node:fs/promises";
+import { formatErrorMessage } from "openclaw/plugin-sdk/error-runtime";
+import { QaSuiteArtifactError } from "./errors.js";
+
+export async function assertQaSuiteArtifactWritten(
+  kind: "evidence" | "report" | "summary",
+  filePath: string,
+) {
+  try {
+    await fs.access(filePath);
+  } catch (error) {
+    throw new QaSuiteArtifactError(
+      `${kind}_missing`,
+      `QA suite did not produce ${kind} artifact at ${filePath}: ${formatErrorMessage(error)}`,
+      { cause: error },
+    );
+  }
+}
diff --git a/extensions/qa-lab/src/suite.ts b/extensions/qa-lab/src/suite.ts
index 9915c722a14f..8905a860d40f 100644
--- a/extensions/qa-lab/src/suite.ts
+++ b/extensions/qa-lab/src/suite.ts
@@ -12,7 +12,7 @@ import {
   type QaReportScenario,
 } from "openclaw/plugin-sdk/qa-runtime";
 import { fetchWithSsrFGuard } from "openclaw/plugin-sdk/ssrf-runtime";
-import { QaSuiteArtifactError } from "./errors.js";
+import { assertQaSuiteArtifactWritten } from "./artifact-assertion.js";
 import { buildQaSuiteEvidenceSummary, QA_EVIDENCE_FILENAME } from "./evidence-summary.js";
 import { startQaGatewayChild, type QaCliBackendAuthMode } from "./gateway-child.js";
 import type {
@@ -884,21 +884,6 @@ async function writeQaSuiteArtifacts(params: {
   return { evidencePath, report, reportPath, summaryPath };
 }
 
-async function assertQaSuiteArtifactWritten(
-  kind: "evidence" | "report" | "summary",
-  filePath: string,
-) {
-  try {
-    await fs.access(filePath);
-  } catch (error) {
-    throw new QaSuiteArtifactError(
-      `${kind}_missing`,
-      `QA suite did not produce ${kind} artifact at ${filePath}: ${formatErrorMessage(error)}`,
-      { cause: error },
-    );
-  }
-}
-
 function buildQaSuiteRuntimeMetrics(params: {
   startedAt: Date;
   finishedAt: Date;
diff --git a/extensions/qa-lab/src/test-file-scenario-runner.ts b/extensions/qa-lab/src/test-file-scenario-runner.ts
index 178beebbe78c..0fa38792af08 100644
--- a/extensions/qa-lab/src/test-file-scenario-runner.ts
+++ b/extensions/qa-lab/src/test-file-scenario-runner.ts
@@ -2,8 +2,8 @@ import { spawn } from "node:child_process";
 import fs from "node:fs/promises";
 import path from "node:path";
 import { formatErrorMessage } from "openclaw/plugin-sdk/error-runtime";
+import { assertQaSuiteArtifactWritten } from "./artifact-assertion.js";
 import { isRepoRootRelativeRef, toRepoRelativePath } from "./cli-paths.js";
-import { QaSuiteArtifactError } from "./errors.js";
 import {
   buildPlaywrightEvidenceSummary,
   buildScriptEvidenceSummary,
@@ -542,22 +542,10 @@ async function writeTestFileEvidenceFile(params: {
 }): Promise<Pick<QaTestFileScenarioRunResult, "evidencePath">> {
   const evidencePath = path.join(params.outputDir, QA_EVIDENCE_FILENAME);
   await fs.writeFile(evidencePath, `${JSON.stringify(params.evidence, null, 2)}\n`, "utf8");
-  await assertQaTestFileArtifactWritten("evidence", evidencePath);
+  await assertQaSuiteArtifactWritten("evidence", evidencePath);
   return { evidencePath };
 }
 
-async function assertQaTestFileArtifactWritten(kind: "evidence", filePath: string) {
-  try {
-    await fs.access(filePath);
-  } catch (error) {
-    throw new QaSuiteArtifactError(
-      `${kind}_missing`,
-      `QA suite did not produce ${kind} artifact at ${filePath}: ${formatErrorMessage(error)}`,
-      { cause: error },
-    );
-  }
-}
-
 export async function runQaTestFileScenarios(
   params: QaTestFileScenarioRunParams,
 ): Promise<QaTestFileScenarioRunResult> {