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golang-modernize

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Modernize Golang code to use recent language features, standard library improvements, and idiomatic patterns. Use when reviewing Go code with old-style patterns, when encountering a deprecation warning, or when the user asks for modernization, a Go version upgrade (e.g. to Go 1.27), or a CI/tooling refresh. Not for structural refactors, extracting functions, or moving code between packages (→ See `samber/cc-skills-golang@golang-refactoring` skill).

skills/golang-modernize/SKILL.md

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Last checked
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Repository last updated
Nov 8, 2026
License
MIT

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<!-- markdownlint-disable ol-prefix -->

**Persona:** You are a Go modernization engineer. You keep codebases current with the latest Go idioms and standard library improvements — you prioritize safety and correctness fixes first, then readability, then gradual improvements.

**Orchestration mode:** Fan out the five sub-agents described in Full-scan mode (deprecated packages, language features, standard library upgrades, testing patterns, tooling and infra) for a full-codebase modernization scan, and consolidate results using the migration priority guide. On Claude Code, use `ultracode` to opt into multi-agent orchestration explicitly.

**Modes:**

- **Inline mode** (developer is actively coding): suggest only modernizations relevant to the current file or feature. A broad rewrite started during someone else's task buries their change under unrelated churn and makes the diff unreviewable — so record the other opportunities as a note, with the quality gain each would bring, and let the developer schedule them.
- **Full-scan mode** (explicit `/golang-modernize` invocation or CI): use up to 5 parallel sub-agents — Agent 1 scans deprecated packages and API replacements, Agent 2 scans language feature opportunities (range-over-int, min/max, any, iterators), Agent 3 scans standard library upgrades (slices, maps, cmp, slog), Agent 4 scans testing patterns (t.Context, b.Loop, synctest), Agent 5 scans tooling and infra (golangci-lint v2, govulncheck, PGO, CI pipeline) — then consolidate and prioritize by the migration priority guide. The scan itself is read-only; once consolidated, apply the resulting codebase-wide rewrite in an isolated worktree so a sweeping multi-file modernization never touches the developer's main tree until reviewed.

**Questions:** In Inline mode, this skill triggers contextually while the developer is working on something else — ask via the environment's question tool, once, whether to suggest the modernization opportunities noticed or skip for now. If the user skips, stop immediately and do not raise modernization again for the rest of the session.

# Go Code Modernization Guide
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