diff --git a/schemas/agent-preview.json b/schemas/agent-preview.json
index feb4e00..617d82f 100644
--- a/schemas/agent-preview.json
+++ b/schemas/agent-preview.json
@@ -6,4 +6,4 @@
       "type": "null"
     }
   }
-}
\ No newline at end of file
+}
diff --git a/src/handleTestResults.ts b/src/handleTestResults.ts
index 8112a56..6b1e466 100644
--- a/src/handleTestResults.ts
+++ b/src/handleTestResults.ts
@@ -5,6 +5,7 @@
  * For full license text, see LICENSE.txt file in the repo root or https://opensource.org/licenses/BSD-3-Clause
  */
 import { join } from 'node:path';
+import { stripVTControlCharacters } from 'node:util';
 import { writeFile, mkdir } from 'node:fs/promises';
 import { AgentTestResultsResponse, convertTestResultsToFormat, humanFriendlyName } from '@salesforce/agents';
 import { Ux } from '@salesforce/sf-plugins-core/Ux';
@@ -158,7 +159,7 @@ export async function handleTestResults({
     const formatted = humanFormat(results);
     if (outputDir) {
       const file = `test-result-${id}.txt`;
-      await writeFileToDir(outputDir, file, formatted);
+      await writeFileToDir(outputDir, file, stripVTControlCharacters(formatted));
       ux.log(`Created human-readable file at ${join(outputDir, file)}`);
     } else {
       ux.log(formatted);