Go linting

Skill Cadasto/go-coding-plugin/skills/go-linting

AI plugin for coding standards for Go

Install

npx -y skills add Cadasto/go-coding-plugin --skill go-linting

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golangci-lint v2 setup and adoption for Go. This skill should be used when the user configures, upgrades, or debugs Go linting — the `.golangci.yml` file, the golangci-lint v2 schema (the versioned config, the `linters.default` set, the separate formatters section), the `modernize` linter, or stack linters (errorlint, bodyclose, rowserrcheck, sqlclosecheck, noctx, contextcheck). Not for what individual idioms mean (use the `go-idioms` skill) or writing rules by hand.

SKILL.md

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go-linting — golangci-lint v2

Bundled references/ is at the plugin root (beside skills/, two levels above this file) — not under this skill. Read references/golangci.v2.yml as ${CLAUDE_PLUGIN_ROOT}/references/golangci.v2.yml on Claude Code, or ../../references/golangci.v2.yml from this skill's directory, or Glob for the installed references/golangci.v2.yml (host-agnostic).

golangci-lint v2 (Mar 2025) is the de-facto meta-linter and the deterministic core of this plugin. Its schema changed from v1 — v1 config will not parse:

Top-level version: "2" is required.
linters.default: standard | all | none | fast selects the base set (no more enable-all). standard = errcheck, govet, ineffassign, staticcheck, unused.
Formatters moved to their own formatters: section (gofmt/gofumpt/goimports are no longer "linters").

Reference config (v2)

version: "2"
linters:
  default: standard
  enable:
    - modernize       # highest value: range-int, min/max, slices/maps, wg.Go, strings.Cut…
    - errorlint       # %w + errors.Is/As discipline
    - bodyclose       # unclosed http.Response.Body
    - rowserrcheck    # unchecked sql.Rows.Err
    - sqlclosecheck   # unclosed sql.Rows/Stmt
    - noctx           # HTTP/SQL without context
    - contextcheck    # context not propagated
    - containedctx    # context.Context stored in a struct
    - perfsprint      # fmt.Sprintf where a cheaper call exists
    - revive          # configurable golint successor
formatters:
  enable: [gofumpt, goimports]

Adoption

Run: golangci-lint run; auto-fix what's fixable (incl. modernize and formatters): golangci-lint run --fix.
Pin the version in CI for reproducibility (the Cadasto Go repos pin v2.11.4); a version drift silently changes the rule set.
modernize is the single highest-leverage linter — it operationalizes most go-idioms rules on the same engine as gopls/go fix, so the plugin's advice stays consistent with the toolchain. As of Go 1.26 the rewritten go fix ./... runs that same modernizer suite from the toolchain itself; keep modernize in golangci-lint for CI reproducibility and to cover toolchains older than 1.26. Use golangci-lint built with a Go version ≥ the module's toolchain (Go 1.26 support landed in the golangci-lint releases built with 1.26).
Adopt the shipped reference config references/golangci.v2.yml, or run /go-lint-setup to scaffold it into a repo (it won't overwrite an existing config without asking).

Sources

golangci-lint docs — https://golangci-lint.run/docs/
v2 migration — https://ldez.github.io/blog/2025/03/23/golangci-lint-v2/
modernize — https://pkg.go.dev/golang.org/x/tools/go/analysis/passes/modernize