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Use when writing concurrent Go code — goroutines, channels, mutexes, or thread-safety guarantees.

Use when writing Go code that returns, wraps, or handles errors — choosing between sentinel errors, custom types, and fmt.Errorf (%w vs…

Use when designing a Go constructor or factory function with optional configuration — especially with 3+ optional parameters or extensible…

Use when reviewing Go code or checking code against community style standards.

Use when working with context.Context in Go — placement in signatures, propagating cancellation and deadlines, and storing values in…

Use when writing conditionals, loops, or switch statements in Go — including if with initialization, early returns, for loop forms, range…

Use when working with Go slices, maps, or arrays — choosing between new and make, using append, declaring empty slices (nil vs literal for…

Use when declaring or initializing Go variables, constants, structs, or maps — including var vs :=, reducing scope with if-init…

Use when hardening Go code at API boundaries — copying slices/maps, verifying interface compliance, using defer for cleanup…

Use when writing or reviewing documentation for Go packages, types, functions, or methods.

Use when organizing functions within a Go file, formatting function signatures, designing return values, or following Printf-style naming…

Use when deciding whether to use Go generics, writing generic functions or types, choosing constraints, or picking between type aliases…