ponytail-review

Review diffs for unnecessary complexity. One line per finding: location, what to cut, what replaces it. The diff's best outcome is getting shorter.

Format

<N>. L<line>: <tag> <what>. <replacement>., or <N>. <file>:L<line>: ... for multi-file diffs. Number findings 1., 2., ... across the whole report, so the user can say "fix 2 and 5".

Tags:

• delete: dead code, unused flexibility, speculative feature. Replacement: nothing.
• stdlib: hand-rolled thing the standard library ships. Name the function.
• native: dependency or code doing what the platform already does. Name the feature.
• reuse: equivalent helper, util, or pattern already in this repo. Name the path.
• yagni: abstraction with one implementation, config nobody sets, layer with one caller.
• shrink: same logic, fewer lines. Show the shorter form.

Examples

❌ "This EmailValidator class might be more complex than necessary, have you considered whether all these validation rules are needed at this stage?"

✅ 1. L12-38: stdlib: 27-line validator class. "@" in email, 1 line, real validation is the confirmation mail.

✅ 2. L4: native: moment.js imported for one format call. Intl.DateTimeFormat, 0 deps.

✅ 3. L18-29: reuse: slugify helper duplicates src/lib/slug.ts slugify. Delete it, import the existing one.

✅ 4. repo.py:L88: yagni: AbstractRepository with one implementation. Inline it until a second one exists.

✅ 5. L52-71: delete: retry wrapper around an idempotent local call. Nothing replaces it.

✅ 6. L30-44: shrink: manual loop builds dict. dict(zip(keys, values)), 1 line.

Scoring

End with the only metric that matters: net: -<N> lines possible.

If there is nothing to cut, say Lean already. Ship. and stop.

Boundaries

Scope: over-engineering and complexity only. Correctness bugs, security holes, and performance are explicitly out of scope. Route them to a normal review pass, not this one. A single smoke test or assert-based self-check is the ponytail minimum, not bloat, never flag it for deletion. Does not apply the fixes, only lists them. "stop ponytail-review" or "normal mode": revert to verbose review style.