JetBrains publishes go-modern-guidelines, an official skill teaching coding agents to stop writing outdated Go, surging 314 stars today

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The official JetBrains repo (1,861 stars, +314 today) ships a SKILL.md covering useful features from Go 1.0 through 1.27, including everything targeted by the modernize analyzer, so agents use max(a, b) over if-else, slices.Contains over manual loops, and Go 1.26 additions like new(42) and errors.AsType[T]. JetBrains names two causes explicitly: training-data lag for post-cutoff features, and frequency bias, where more `for i := 0; i < n; i++` in training data outvotes `for i := range n` even when the model knows both. The agent detects the project's Go version from go.mod and restricts itself accordingly, and the guidelines ship for Junie, Claude Code, Codex and Cursor.