Go Control Flow: Helping Agents Write Idiomatic Go

Where this fits

A developer is pairing with an agent on a Go service. They ask it to validate a request and skip empty entries. The agent writes nested if err != nil checks, a for loop using an index instead of range, and a switch where a type switch would be clearer. The code works, but it doesn't look like Go. This skill steps in whenever the agent writes conditionals, loops, switch statements, or blank identifier patterns—even a simple if/else or for loop. It provides routing to focused references, so the agent learns the idiomatic form before it emits code. You can see the full skill on OpenAgentSkill at https://www.openagentskill.com/skills/cxuu-go-control-flow.

Why agents benefit

• Uses if with initialization to scope error variables only to the block where they are needed.
• Applies early returns and guard clauses instead of nesting happy-path and error handling together.
• Selects the correct for loop form: init/condition/post, while-style, or range over slices, maps, and channels.
• Handles switch and type switches with awareness of fallthrough, default ordering, and labeled breaks.
• Uses _ appropriately for discarding values and for compile-time assertions like var _ Interface = Type{}.

Practical scenarios

Refactoring nested validation into guard clauses

An agent reads a function with five levels of if err != nil. The skill tells it to invert the condition and return early, leaving the main path flat and readable.

Scoping a temporary error with if initialization

The agent sees an error variable used only to decide whether to log and return. Instead of declaring err before the if and leaking it into the function scope, it writes if err := file.Chmod(0664); err != nil { ... }.

Choosing range and blank identifier for a map loop

A developer asks for a loop that prints only map keys. The agent writes for k := range m rather than for k, _ := range m, and when a function returns multiple values it uses _ to discard the ones the next call needs.

Add it to your agent workflow

Install the skill with:

npx skills add cxuu/golang-skills --skill go-control-flow

Once installed, the skill is available as context whenever the agent is generating Go control flow. By default it routes the agent to SWITCH-PATTERNS.md for switch-related work and BLANK-IDENTIFIER.md for discard patterns, so the right reference is loaded before code is written.

Compare before adopting

Before adding this skill to an agent, compare it against alternatives by looking at: quality signals, such as whether the README gives clear examples and routing; maintenance freshness, ensuring it tracks current Go conventions; alternatives, including custom style prompts or other skills from the same repository; and workflow fit, specifically whether it complements the go-error-handling skill without overlapping. The separation of control flow from error handling is useful because it keeps each skill focused and easy to invoke.

Why it is worth tracking

This skill has 155 stars and comes from a focused collection with clear reference documents rather than a single filesystem prompt. It is worth tracking because control-flow idioms are one of the most visible signs of Go style in agent-generated code. If your agents produce code that compiles but feels un-Go-like, this is a signal that the skill list should be evaluated. Watch for updates to the repository and community usage; when Go releases change loop or switch behavior, a maintained skill will reflect it.