Universal linter that auto-detects ruff/eslint/clippy/gofmt for the project language. Use when linting code, auto-fixing, formatting, or running pre-commit checks.
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Universal linter that auto-detects ruff/eslint/clippy/gofmt for the project language. Use when linting code, auto-fixing, formatting, or running pre-commit checks.
name
code-lint
When to Use This Skill
Use this skill when...
Use something else instead when...
Auto-detecting and running the correct linter for a polyglot repo
Detecting structural anti-patterns linters miss → code-antipatterns
Running ruff/eslint/clippy/gofmt with optional --fix and --format
Reviewing broader code quality and architecture → code-review
Driving a one-shot lint pass before commit
Scanning specifically for swallowed errors → code-hidden-failures --track errors
Looking up autofix commands or common fix patterns per language
Pre-commit config: !find . -maxdepth 1 -name ".pre-commit-config.yaml" -type f
Parameters
Parse $ARGUMENTS and bind three values before running anything. These are
supplied by the caller; nothing substitutes them for you.
Token in $ARGUMENTS
Binds
Default when absent
First non-flag token
PATH — the file or directory to lint
. (repo root)
--fix
FIX — apply autofixes
off; check only
--format
FORMAT — run formatters in write mode
off; formatters run in --check mode
Every command in Step 2 is written with a literal PATH placeholder. Substitute
the bound value when you run it — e.g. with $ARGUMENTS empty, ruff check PATH
is run as ruff check ..
Execution
Run this lint pass:
Step 0: One-shot path (preferred when no PATH is given)
When the caller passed no path (or passed .), the bundled detector already does
detection, tool discovery, and fixing in a single call:
Pass --check-only unless FIX is set. It detects biome, eslint, prettier,
ruff, black, clippy, rustfmt, gofmt, golangci-lint, and shellcheck, reports which
were found, and shows modified files. Report its output and stop.
Continue to Step 1 when the caller scoped the run to a specific PATH, or when
the detector reports no linters found.
Step 1: Detect the project language
Read the Package files line from Context above (or ls the target directory)
and map each marker file to a language. The signals are the marker files — do
not guess from file extensions or the repo name.
Marker file present in the repo root
Language
pyproject.toml, setup.py, requirements.txt
Python
package.json
JavaScript / TypeScript
Cargo.toml
Rust
go.mod
Go
Exactly one match → run that row of Step 2.
Several matches (polyglot repo) → run each matching row, then aggregate the
results into one summary. Do not pick one arbitrarily.
No match → skip to Step 3.
Step 2: Run the row for each detected language
Run the Lint and Format commands for every detected language. Swap in the
--fix / --format variants only when the caller set those flags.
Language
Lint (always)
Lint with --fix
Format check (default)
Format with --format
Python
uv run ruff check PATH --output-format=concise
uv run ruff check PATH --output-format=concise --fix
uv run ty check PATH --hide-progress, uv run bandit -q -r PATH
JavaScript / TypeScript
npx tsc --noEmit
Rust
cargo check
Go
staticcheck ./... (only if installed)
When the repo defines its own lint script (npm run lint, a just lint recipe),
prefer it over the raw command above — it encodes the project's own flags.
Step 3: Fallback when no language was detected
In order, stopping at the first that applies:
Makefile present → make lint
package.json with a lint script → npm run lint
Otherwise report that no linters were found, and suggest /deps:install --dev
and /configure:linting.
Step 4: Pre-commit integration
If the Pre-commit config line in Context is non-empty:
Caller flags
Command
default
pre-commit run --all-files
--fix
pre-commit run --all-files --show-diff-on-failure
Autofix Command Reference
Language
Linter
Autofix Command
TypeScript/JS
biome
npx @biomejs/biome check --write .
TypeScript/JS
biome format
npx @biomejs/biome format --write .
Python
ruff
ruff check --fix .
Python
ruff format
ruff format .
Rust
clippy
cargo clippy --fix --allow-dirty
Rust
rustfmt
cargo fmt
Go
gofmt
gofmt -w .
Go
go mod
go mod tidy
Shell
shellcheck
No autofix (manual only)
Common Fix Patterns
JavaScript/TypeScript (Biome): unused imports, prefer-const (let x = 5 → const x = 5).
