go-functions
Use when organizing functions within a Go file, formatting function signatures, designing return values, or following Printf-style naming conventions. Also use when a user is adding or refactoring any Go function, even if they don't mention function design or signature formatting. Does not cover functional options constructors (see go-functional-options).
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/cxuu/golang-skills --skill go-functions- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads go-functions automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Go Function Design
Resource Routing
references/SIGNATURES.md- Read when designing parameters, return values, named results, or signature readability.references/PRINTF-STRINGER.md- Read when using fmt verbs, Stringer, GoStringer, Formatter, or Printf-style function naming.
When this skill does NOT apply: For functional options constructors (
WithTimeout,WithLogger), see go-functional-options. For error return conventions, see go-error-handling. For naming functions and methods, see go-naming.
Function Grouping and Ordering
Organize functions in a file by these rules:
- Functions sorted in rough call order
- Functions grouped by receiver
- Exported functions appear first, after
struct/const/vardefinitions NewXxx/newXxxconstructors appear right after the type definition- Plain utility functions appear toward the end of the file
type something struct{ ... }
func newSomething() *something { return &something{} }
func (s *something) Cost() int { return calcCost(s.weights) }
func (s *something) Stop() { ... }
func calcCost(n []int) int { ... }
Function Signatures
Keep the signature on a single line when possible. When it must wrap, put all arguments on their own lines with a trailing comma:
func (r *SomeType) SomeLongFunctionName(
foo1, foo2, foo3 string,
foo4, foo5, foo6 int,
) {
foo7 := bar(foo1)
}
Add /* name */ comments for ambiguous arguments, or better yet, replace naked
bool parameters with custom types.
Pointers to Interfaces
You almost never need a pointer to an interface. Pass interfaces as values — the underlying data can still be a pointer.
// Bad: pointer to interface
func process(r *io.Reader) { ... }
// Good: pass the interface value
func process(r io.Reader) { ... }
Printf and Stringer
Printf-style Function Names
Functions that accept a format string should end in f for go vet support.
Declare format strings as const when used outside Printf calls.
Prefer %q over %s with manual quoting when formatting strings for logging
or error messages — it safely escapes special characters and wraps in quotes:
return fmt.Errorf("unknown key %q", key) // produces: unknown key "foo\nbar"
See go-functional-options when designing a constructor with 3+ optional parameters.
Quick Reference
| Topic | Rule |
|---|---|
| File ordering | Type -> constructor -> exported -> unexported -> utils |
| Signature wrapping | All args on own lines with trailing comma |
| Naked parameters | Add /* name */ comments or use custom types |
| Pointers to interfaces | Almost never needed; pass interfaces by value |
| Printf function names | End with f for go vet support |
Related Skills
- Error returns: See go-error-handling when designing error return patterns or wrapping errors in multi-return functions
- Naming conventions: See go-naming when naming functions, methods, or choosing getter/setter patterns
- Functional options: See go-functional-options when designing a constructor with 3+ optional parameters
- Formatting principles: See go-style-core when deciding line length, naked returns, or signature formatting
FAQ
What does the go-functions skill do?
Use when organizing functions within a Go file, formatting function signatures, designing return values, or following Printf-style naming conventions. Also use when a user is adding or refactoring any Go function, even if they don't mention function design or signature formatting. Does not cover functional options constructors (see go-functional-options).
How do I install go-functions?
Run npx skills add https://github.com/cxuu/golang-skills --skill go-functions in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/go-functions/ (personal) or .claude/skills/go-functions/ (project).
Which AI agents can use go-functions?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is go-functions safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains go-functions?
It is published by cxuu in cxuu/golang-skills. It has 1,019 recorded installs.
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