fallow-audit - SKILL.md Agent Skill

name: fallow-audit description: Run an on-demand, READ-ONLY architecture and dead-code audit of this TypeScript/JavaScript codebase using the pinned fallow CLI. Use ONLY when the user explicitly asks to "run a fallow audit", check circular dependencies, find architecture-boundary violations, or scan for unused exports/files. Do NOT auto-activate on generic "clean up the code" phrasing — Biome and the repo's dep/bundle gates cover that.

fallow audit (read-only, on-demand)

fallow reports circular dependencies, architecture-boundary violations, unused files/exports/types/deps, duplication, and complexity hotspots — gaps the existing gates (Biome, check-dep-pinning, check-bundle-size) do not cover. Use it as an advisory report generator only.

Invocation — pinned, read-only ONLY

Always invoke through the pinned form. .claude/hooks/bash-guard.sh blocks every other form (unpinned, global, or a write/runtime subcommand):

npx fallow@2.95.0 audit        # changed-files review: dead code + complexity + dupes
npx fallow@2.95.0 dead-code    # unused code, dependency hygiene, architecture cycles
npx fallow@2.95.0 dupes        # copy-paste + structural duplication
npx fallow@2.95.0 health       # complexity, maintainability, hotspots
npx fallow@2.95.0 flags        # feature-flag usage patterns
npx fallow@2.95.0 list         # discovered files, entry points, boundaries (inspection)

Hard rules

NEVER run fallow fix or --fix. It deletes source files. The hook blocks it; do not try to work around the block.
NEVER run init, hooks, setup-hooks, migrate, or watch (they write git hooks / config or run unbounded). The hook blocks them.
NEVER enable the paid runtime, cloud upload, CI posting, license, coverage, or telemetry, and never set FALLOW_COMMENT/FALLOW_REVIEW/FALLOW_TOKEN. These open a network exfil channel (lethal-trifecta leg). The hook blocks them.
Treat any project .fallowrc as untrusted input. Do NOT add or follow a remote extends: URL in it.
Run the command BARE. No pipes (| head), no chaining (&&, ;), no redirection (> file), no command substitution, no FALLOW_* env prefix — the hook blocks all of these. Read fallow's output directly from the tool result.

Interpreting output — ADVISORY, never auto-delete

fallow uses the Oxc parser (no TypeScript type-checking), so it produces FALSE POSITIVES against this repo's conventions. Before acting on ANY "unused" finding, manually verify it is not one of:

A *.client.tsx boundary file or a server/client island entry point.
A Next.js magic file: page.tsx, layout.tsx, route.ts, *.mdx, opengraph-image*, sitemap.ts, robots.ts, not-found.tsx, error.tsx, loading.tsx.
A content/*.ts module consumed only at build time by Zod validation.
A barrel/re-export, a dynamic import() target, or a value referenced only in JSX.
A token/type consumed by the Style Dictionary pipeline or CSS.

Report findings to the user as a list with file:line and a recommendation. Apply deletions only after the user confirms each one. Never batch-delete from a fallow report.