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diff --git a/modules/test/test-ai-fs-tools.js b/modules/test/test-ai-fs-tools.js
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+// modules/test/test-ai-fs-tools.js — run: node
+// Proves MAINT-011 (list_files must see the virtual /sys mount) and MAINT-012
+// (write_file must not report success when the write was refused).
+const fsMod = require('fs'), path = require('path');
+const ROOT = path.join(__dirname, '..', 'core');
+const ls = {};
+global.localStorage = { getItem: k => (k in ls ? ls[k] : null), setItem: (k, v) => { ls[k] = String(v); }, removeItem: k => { delete ls[k]; } };
+global.indexedDB = { open() { throw new Error('no idb'); }, deleteDatabase() { throw new Error('no idb'); } };
+global.window = global;
+
+const load = (file, cls) => new Function(fsMod.readFileSync(path.join(ROOT, file), 'utf8') + '\nreturn ' + cls + ';')();
+const VFS = load('virtual-fs.js', 'VirtualFileSystem');
+const AI = load('module-aiassist.js', 'WebX11AIAssistantModule');
+
+function mk() {
+    const out = [];
+    const vfs = new VFS();
+    vfs.saveToStorage = () => true;
+    // Bypass the constructor (it touches the DOM) but keep the real prototype methods.
+    const ai = Object.create(AI.prototype);
+    ai.terminal = { print: (m, t) => out.push({ text: String(m), type: t || '' }), log: () => {}, fs: vfs };
+    ai.checkGuardrail = () => null;
+    return { ai, vfs, out };
+}
+
+let fails = 0, passes = 0;
+function ok(name, cond, detail) {
+    if (cond) { passes++; return; }
+    fails++;
+    console.log('FAIL ' + name + (detail ? ' — ' + detail : ''));
+}
+const run = async (ai, name, args) => JSON.parse(await ai.runTool(name, args));
+
+(async () => {
+    // A. list_files on the virtual /sys mount
+    {
+        const { ai } = mk();
+        const res = await run(ai, 'list_files', { path: '/sys' });
+        ok('A1 /sys lists entries instead of an error', Array.isArray(res), JSON.stringify(res).slice(0, 120));
+        ok('A2 /sys contains the modules mount', Array.isArray(res) && res.some(e => e.name === 'modules'),
+            JSON.stringify(res).slice(0, 160));
+    }
+
+    // B. a genuinely missing directory still reports the error
+    {
+        const { ai } = mk();
+        const res = await run(ai, 'list_files', { path: '/no-such-dir' });
+        ok('B1 missing path reports Directory not found', !!res.error && /Directory not found/.test(res.error), JSON.stringify(res));
+    }
+
+    // C. write_file into a missing parent must not claim success
+    {
+        const { ai, vfs } = mk();
+        const res = await ai.runTool('write_file', { path: '/missing/dir/f.txt', content: 'x' });
+        ok('C1 refused write reports failure', typeof res === 'string' && /Write FAILED/.test(res), String(res));
+        ok('C2 nothing was created', vfs.readFile('/missing/dir/f.txt') === null);
+    }
+
+    // D. the same write succeeds once the parent exists
+    {
+        const { ai, vfs } = mk();
+        vfs.mkdirRecursive('/missing/dir');
+        const res = await ai.runTool('write_file', { path: '/missing/dir/f.txt', content: 'x' });
+        ok('D1 successful write still reports success', /File written/.test(String(res)), String(res));
+        ok('D2 content landed', vfs.readFile('/missing/dir/f.txt') === 'x');
+    }
+
+    if (fails === 0) {
+        console.log('test-ai-fs-tools: ' + passes + ' passed, 0 failed');
+    } else {
+        console.log('test-ai-fs-tools: ' + passes + ' passed, ' + fails + ' FAILED');
+        process.exit(1);
+    }
+})();