JetBrains has released a specialized repository, "go-modern-guidelines," designed to provide explicit technical references for AI coding agents to ensure they produce modern, idiomatic Go code. To combat training data lag and frequency bias—where models default to outdated patterns like manual loops or if-else blocks—these guidelines instruct agents to utilize contemporary language features and standard library additions available from Go 1.0 through Go 1.27. Specifically, the guidelines encourage the use of built-in functions like max(a, b), slice operations such as slices.Contains, and cmp.Or(a, b, c) for nil checks. They also incorporate Go 1.26 features, including the new(42) syntax for obtaining pointers to values and the type-safe errors.AsType[T](err) method for error matching. The system functions by detecting the project's Go version via the go.mod file, ensuring the agent only employs features compatible with the specific toolchain. The solution is implemented via a small CLI installed through go install into a local cache, avoiding direct modification of the user's project. It is compatible with major AI agents including Junie, Claude Code, Codex, Cursor, and others via skills.sh, requiring Go 1.25 or newer (or automatic toolchain switching via GOTOOLCHAIN=auto).