[Critical] Self-healing regression: the old save path wrote JSON.stringify(config) unconditionally, which always produced valid JSON — silently repairing a corrupted trustedFolders.json on the next save. The new path calls parse(originalContent) first; if that throws (severe file corruption), the outer catch aborts the entire save and the corrupted file persists. Every subsequent trust decision then fails to persist with only a generic stderr message.

Suggested fix — fall back to a clean write when the comment-preserving round-trip fails:

let content: string;
if (fs.existsSync(trustedFoldersFile.path)) {
  try {
    const originalContent = fs.readFileSync(trustedFoldersFile.path, 'utf-8');
    const parsed = parse(originalContent) as Record<string, unknown>;
    const updated = applyUpdates(
      parsed,
      trustedFoldersFile.config as Record<string, unknown>,
      true,
    );
    content = stringify(updated, null, 2);
    parse(content); // validate
  } catch {
    // Comment-preserving round-trip failed — fall back to clean write
    // so the file self-heals instead of staying broken.
    content = stringify(trustedFoldersFile.config, null, 2);
  }
} else {
  content = stringify(trustedFoldersFile.config, null, 2);
}

— qwen3.7-max via Qwen Code /review

[Suggestion] sync=true causes applyUpdates to actively delete every key in the on-disk file that is absent from the in-memory config. When multiple Qwen Code processes run concurrently (common — multiple terminal windows), this silently destroys trust entries that another process added between this process's load-time and save-time. The old code (JSON.stringify(config)) had the same blind-overwrite behavior, but the new code's file re-read creates an opportunity to use sync=false for merge semantics, preserving concurrent additions.

Consider changing to sync=false (or omitting the default) and adjusting the second test accordingly.

— qwen3.7-max via Qwen Code /review

[Suggestion] Both new error branches introduced by the comment-preserving save are untested:

1. parse(originalContent) throwing when the file exists but is corrupted
2. Validation parse(content) failing after stringify

Without tests, a future refactor could silently remove the validation guard or the fallback behavior without CI catching it. Consider adding tests that mock comment-json's parse to throw on the relevant call and assert that atomicWriteFileSync is not called (error path) or that the fallback clean write is used instead.

— qwen3.7-max via Qwen Code /review

[Suggestion] The read → parse → applyUpdates → validate → write pipeline here (lines 185-201) is a near-exact duplicate of packages/cli/src/utils/commentJson.ts:updateSettingsFilePreservingFormat (lines 39-82). The only meaningful difference is the write mechanism (atomicWriteFileSync with noFollow vs writeWithBackupSync). A future maintainer who spots this duplication will see an obvious "refactor to reuse" — and by consolidating into updateSettingsFilePreservingFormat (which lacks noFollow), they silently drop the symlink-attack mitigation that is intentional here.

Consider either extracting a shared pure helper that returns prepared content (without writing), or adding a comment at this site documenting why the intentional divergence exists.

— qwen3.7-max via Qwen Code /review

[Critical] This test does not actually exercise the validation-failure code path. The first mockImplementationOnce replaces parse with JSON.parse, but originalContent contains // work repos — a JSONC comment that JSON.parse cannot handle. So parse(originalContent) throws at the initial parse step (line ~198 of trustedFolders.ts), the catch block fires immediately, and execution never reaches the validation parse(preservedContent) at line ~208. The second mockImplementationOnce is never consumed.

This makes the test a duplicate of test 3 (parse-failure fallback). The validation-failure branch — where the round-trip succeeds but stringify produces unparseable output — remains untested.

— qwen3.7-max via Qwen Code /review

[Suggestion] This mockImplementationOnce intercepts the first parse() call — parse(originalContent) at trustedFolders.ts:196 — not the validation parse(preservedContent) at line 207. Execution throws here and jumps to the catch block before applyUpdates, stringify, or the validation parse are ever reached. This makes test 4 functionally identical to test 3 ("fails during parse"); the validation-failure branch at line 207 remains untested.

To fix: let the first parse call succeed with the real implementation, and throw only on the second call:

— qwen3.7-max via Qwen Code /review

[Critical] Top-level array in trustedFolders.json causes silent trust-data loss, bypassing the self-healing fallback.

parse(originalContent) can return a CommentArray when the file contains [] or [1,2,3]. Unlike the load path (loadTrustedFolders, line 147) which has an explicit Array.isArray(parsed) guard, the save path has no type check. The downstream consequences are:

1. applyUpdates(array, config, false) sets string keys (e.g. "/home/user/project-a") as non-numeric own properties on the array.
2. comment-json.stringify(array) only serializes numeric indices, producing [] — all config entries are silently dropped.
3. The validation parse("[]") succeeds (it is valid JSON), so the catch block is never triggered.
4. content = "[]" overwrites the correct clean fallback.
5. atomicWriteFileSync writes [] to disk — all trust decisions are destroyed.

Add the same structural guard the load path uses:

— qwen3.7-max via Qwen Code /review

[Suggestion] The catch block is empty, so when comment preservation fails the user's comments are silently stripped with no diagnostic output. The reference implementation updateSettingsFilePreservingFormat() in commentJson.ts (lines 48-55, 71-79) logs via writeStderrLine in every failure branch — writeStderrLine is already imported in this file.

Adding a one-line log makes silent degradation diagnosable (e.g. after a comment-json version bump that changes parser behavior):

— qwen3.7-max via Qwen Code /review

[Critical] comment-json.parse() wraps JSON primitives ("hello", 42, true) in CommentObject instances that are typeof === 'object', non-null, non-Array — passing all three type-guard checks. When applyUpdates sets string keys on a wrapper like new String("hello") and stringify serializes it, the config entries are silently dropped and only the primitive value is written to disk.

The self-healing fallback is never reached because no exception is thrown — the validation parse(preservedContent) succeeds since the primitive is valid JSON. Verified empirically: parse('"hello"') → instanceof String === true, and after mutation + stringify → "hello" (all config entries lost).

— qwen3.7-max via Qwen Code /review

[Suggestion] mockImplementationOnce((...args) => commentJson.parse(...args)) calls the spy itself (since commentJson.parse IS the mock), which consumes the second mockImplementationOnce (the throw). The throw therefore happens during parse(originalContent) — not parse(preservedContent) as the test name claims. The test passes only because both failures hit the same catch block, but the "validation failure" code path at trustedFolders.ts:213 is never actually exercised.

A symptom of this: the test is missing the writeStderrLine assertion that the other two fallback tests include.

Fix: use vi.importActual to get the real parse reference, avoiding the self-call:

const actualCommentJson = await vi.importActual<typeof commentJson>('comment-json');
parseSpy
  .mockImplementationOnce((...args: Parameters<typeof commentJson.parse>) =>
    actualCommentJson.parse(...args),
  )
  .mockImplementationOnce(() => {
    throw new Error('invalid preserved output');
  });

— qwen3.7-max via Qwen Code /review

[Suggestion] The em-dash — (U+2014, bytes e2 80 94) was corrupted to mojibake 鈥? (bytes e9 88 a5 3f). On origin/main the line reads // config path — a redirected write but the PR branch reads // config path 鈥?a redirected write. This suggests an encoding conversion error in the editing environment.

The same corruption also appears in trustedFolders.test.ts:222 (// posture 鈥?a pre-placed symlink → // posture — a pre-placed symlink).

— qwen3.7-max via Qwen Code /review

[Suggestion] The parsed === null branch in the type guard (trustedFolders.ts:199) has no test coverage. comment-json.parse('null') returns literal null (typeof 'object', === null true), which the guard catches — but no test exercises this path.

The existing assertion ('trusted folders file is not a JSON object') already matches.

— qwen3.7-max via Qwen Code /review