prune

name

prune

description

Code review focused exclusively on over-engineering. Finds what to delete: reinvented standard library, unneeded dependencies, speculative abstractions, dead flexibility. One line per finding: location, what to cut, what replaces it. Use when the user says "review for over-engineering", "is this over-engineered", or invokes /prune. Complements correctness-focused review; this one only hunts complexity.

If no diff is in context, fetch one first: run git diff HEAD for uncommitted changes, gh pr diff $ARGUMENTS for a PR number, or git diff main...HEAD for the current branch.

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

L<line>: <tag> <what>. <replacement>., or <file>:L<line>: ... for multi-file diffs.

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.
• 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?"

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

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

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

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

✅ 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

why-not-mechanizable: scope and YAGNI exceptions are subjective complexity judgments; no hook can detect that a finding belongs in a "correctness" pass versus a "complexity" pass.

• Complexity only - correctness bugs, security holes, and performance go to a normal review pass, not this one (review-time: see section note)
• A single smoke test or assert-based self-check is the minimum, not bloat - never flag it for deletion (review-time: see section note)
• Does not apply the fixes, only lists them (review-time: see section note)

Attribution

Adapted from DietrichGebert/ponytail (MIT).