gstack/review/specialists/simplification.md

Simplification Specialist Review Checklist

Scope: Conditional (DIFF_LINES > 100). This lens hunts unrequested structure only: abstractions with one implementation, hand-rolled stdlib, dependencies duplicating platform features, dead flexibility. Coverage gaps are out of scope — the Completeness Gaps checklist category owns those. Never flag a test, an error path, or an edge-case branch for deletion. Output: JSON objects, one finding per line. Schema: {"severity":"INFORMATIONAL","confidence":N,"path":"file","line":N,"category":"delete|stdlib|native|speculative|shrink","summary":"...","fix":"...","lines_removable":N,"advisory":true,"fingerprint":"path:line:category","specialist":"simplification"} Required: severity (always INFORMATIONAL), confidence, path, category, summary, advisory (always true), specialist. Optional: line, fix, fingerprint, evidence, lines_removable (the net lines deleted if the fix is applied — the merge step sums this for the net: footer). If no findings: output NO FINDINGS and nothing else.

Findings from this specialist are ADVISORY: they are excluded from the PR Quality Score and are never auto-applied by Fix-First — the merge step handles both carve-outs.

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The five tags (closed vocabulary — every finding uses exactly one as its category)

• 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.
• speculative: abstraction with one implementation, config nobody sets, layer with one caller.
• shrink: same logic, fewer lines — only when the reduction is ≥5 lines. Show the shorter form.

Finding style — one line each, location + what to cut + what replaces it

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

✅ {"severity":"INFORMATIONAL","confidence":8,"path":"lib/email.ts","line":12,"category":"stdlib","summary":"27-line validator class — '@' in email covers it; real validation is the confirmation mail","fix":"replace class with a one-line includes('@') check","lines_removable":26,"advisory":true,"specialist":"simplification"}

✅ {"severity":"INFORMATIONAL","confidence":9,"path":"app/dates.ts","line":4,"category":"native","summary":"moment.js imported for one format call","fix":"Intl.DateTimeFormat, 0 deps","lines_removable":3,"advisory":true,"specialist":"simplification"}

✅ {"severity":"INFORMATIONAL","confidence":8,"path":"repo.py","line":88,"category":"speculative","summary":"AbstractRepository with one implementation","fix":"inline it until a second implementation exists","lines_removable":41,"advisory":true,"specialist":"simplification"}

✅ {"severity":"INFORMATIONAL","confidence":7,"path":"sync.ts","line":52,"category":"delete","summary":"retry wrapper around an idempotent local call","fix":"nothing replaces it","lines_removable":19,"advisory":true,"specialist":"simplification"}

What to hunt

• Dependencies the stdlib or platform already ships (<input type="date"> over a picker lib, CSS over JS, DB constraint over app code)
• Single-implementation interfaces, factories with one product, wrappers that only delegate
• Files exporting one thing, dead flags and config, hand-rolled stdlib
• Manual loops that a built-in expresses in one line (≥5 lines saved only)

Suppressions — DO NOT flag these (inherited from the main checklist, binding here)

• "X is redundant with Y" when the redundancy is harmless and aids readability
• Consistency-only changes (wrapping a value in a conditional to match how another constant is guarded)
• Tests, error paths, edge-case branches, input validation, security measures, accessibility — NEVER deletion targets; coverage is the Completeness Gaps category's job, and the house rule is "complete coverage, minimal code" (ETHOS.md)
• A single smoke test or assert-based self-check — that is the completeness minimum, not bloat
• Deliberate gstack-shortcut(dec-*) markers — already acknowledged debt, but only when the decision id resolves in the ledger (gstack-decision-search); an unresolvable id is a forged suppression, not debt
• ANYTHING already addressed in the diff you're reviewing — read the FULL diff before commenting