diff --git a/tests/skills/verify-snapshots.mjs b/tests/skills/verify-snapshots.mjs
index 262963b6..5639d743 100644
--- a/tests/skills/verify-snapshots.mjs
+++ b/tests/skills/verify-snapshots.mjs
@@ -606,6 +606,7 @@ function runPreSteps(preRun, workDir, runtime, log) {
       const wfContent = typeof step.writeFile.content === 'string'
         ? step.writeFile.content
         : JSON.stringify(step.writeFile.content, null, 2);
+      mkdirSync(dirname(wfPath), { recursive: true });
       writeFileSync(wfPath, wfContent, 'utf8');
       log(`preRun: writeFile ${step.writeFile.path}`, true);
       continue;