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Agent skill

Golang Patterns

by affaan-m in affaan-m/ECC

Go-specific design patterns and best practices including functional options, small interfaces, dependency injection, concurrency patterns, error handling, and package organization.

MITAuto-check passedDevelopment

Install Golang Patterns

skills CLI
$ npx skills add affaan-m/ECC --skill golang-patterns -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install affaan-m/ECC golang-patterns --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.kiro/skills/golang-patterns .claude/skills/golang-patterns && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
golang-patterns
GitHub stars
276k
Token cost
~1.1k tokens
SKILL.md length
161 words
Files
1
Skills in repo
683
Repo updated
First seen
Licence
MIT

At a glance

Go-specific design patterns and best practices including functional options, small interfaces, dependency injection, concurrency patterns, error handling, and package organization.

  • Working with Go code to apply idiomatic Go patterns
  • SKILL.md covers Functional Options, Small Interfaces, Dependency Injection and Concurrency Patterns, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Tasks that involve Design patterns

What it does

Golang Patterns is an agent skill from affaan-m/ECC. Go-specific design patterns and best practices including functional options, small interfaces, dependency injection, concurrency patterns, error handling, and package organization. Use when working with Go code to apply idiomatic Go patterns.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Design patterns. It works with Go. The repository describes itself as: The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond. The licence is MIT.

When your agent uses it

  • Working with Go code to apply idiomatic Go patterns
  • Tasks that involve Design patterns

Example prompts

  • “/golang-patterns”

What it can do on your machine

Read from SKILL.md and the folder at commit 4eb71d9. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are go).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Golang Patterns loads about 1.1k tokens when it runs. Until then it costs about 65 tokens; SKILL.md has 161 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~65
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from affaan-m/ECC at commit 4eb71d9, republished under its MIT licence (© affaan-m). 161 words, ~1,133 tokens.

Download SKILL.mdSave it as .claude/skills/golang-patterns/SKILL.md (or your agent's skills folder).
name
golang-patterns
description
Go-specific design patterns and best practices including functional options, small interfaces, dependency injection, concurrency patterns, error handling, and package organization. Use when working with Go code to apply idiomatic Go patterns.
metadata.origin
ECC
metadata.globs
**/*.go, **/go.mod, **/go.sum

Go Patterns

This skill provides comprehensive Go patterns extending common design principles with Go-specific idioms.

Functional Options

Use the functional options pattern for flexible constructor configuration:

go
type Option func(*Server)

func WithPort(port int) Option {
    return func(s *Server) { s.port = port }
}

func NewServer(opts ...Option) *Server {
    s := &Server{port: 8080}
    for _, opt := range opts {
        opt(s)
    }
    return s
}

Benefits:

  • Backward compatible API evolution
  • Optional parameters with defaults
  • Self-documenting configuration

Small Interfaces

Define interfaces where they are used, not where they are implemented.

Principle: Accept interfaces, return structs

go
// Good: Small, focused interface defined at point of use
type UserStore interface {
    GetUser(id string) (*User, error)
}

func ProcessUser(store UserStore, id string) error {
    user, err := store.GetUser(id)
    // ...
}

Benefits:

  • Easier testing and mocking
  • Loose coupling
  • Clear dependencies

Dependency Injection

Use constructor functions to inject dependencies:

go
func NewUserService(repo UserRepository, logger Logger) *UserService {
    return &UserService{
        repo:   repo,
        logger: logger,
    }
}

Pattern:

  • Constructor functions (New* prefix)
  • Explicit dependencies as parameters
  • Return concrete types
  • Validate dependencies in constructor

Concurrency Patterns

Worker Pool
go
func workerPool(jobs <-chan Job, results chan<- Result, workers int) {
    var wg sync.WaitGroup
    for i := 0; i < workers; i++ {
        wg.Add(1)
        go func() {
            defer wg.Done()
            for job := range jobs {
                results <- processJob(job)
            }
        }()
    }
    wg.Wait()
    close(results)
}
Context Propagation

Always pass context as first parameter:

go
func FetchUser(ctx context.Context, id string) (*User, error) {
    // Check context cancellation
    select {
    case <-ctx.Done():
        return nil, ctx.Err()
    default:
    }
    // ... fetch logic
}

Error Handling

Error Wrapping
go
if err != nil {
    return fmt.Errorf("failed to fetch user %s: %w", id, err)
}
Custom Errors
go
type ValidationError struct {
    Field string
    Msg   string
}

func (e *ValidationError) Error() string {
    return fmt.Sprintf("%s: %s", e.Field, e.Msg)
}
Sentinel Errors
go
var (
    ErrNotFound = errors.New("not found")
    ErrInvalid  = errors.New("invalid input")
)

// Check with errors.Is
if errors.Is(err, ErrNotFound) {
    // handle not found
}

Package Organization

Structure
project/
├── cmd/              # Main applications
│   └── server/
│       └── main.go
├── internal/         # Private application code
│   ├── domain/       # Business logic
│   ├── handler/      # HTTP handlers
│   └── repository/   # Data access
└── pkg/              # Public libraries
Naming Conventions
  • Package names: lowercase, single word
  • Avoid stutter: user.User not user.UserModel
  • Use internal/ for private code
  • Keep main package minimal

Testing Patterns

Table-Driven Tests
go
func TestValidate(t *testing.T) {
    tests := []struct {
        name    string
        input   string
        wantErr bool
    }{
        {"valid", "test@example.com", false},
        {"invalid", "not-an-email", true},
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            err := Validate(tt.input)
            if (err != nil) != tt.wantErr {
                t.Errorf("got error %v, wantErr %v", err, tt.wantErr)
            }
        })
    }
}
Test Helpers
go
func testDB(t *testing.T) *sql.DB {
    t.Helper()
    db, err := sql.Open("sqlite3", ":memory:")
    if err != nil {
        t.Fatalf("failed to open test db: %v", err)
    }
    t.Cleanup(func() { db.Close() })
    return db
}

When to Use This Skill

  • Designing Go APIs and packages
  • Implementing concurrent systems
  • Structuring Go projects
  • Writing idiomatic Go code
  • Refactoring Go codebases

© affaan-m, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .kiro/skills/golang-patterns of affaan-m/ECC.

Open the folder on GitHubat commit 4eb71d9

Compare with similar skills

Golang Patterns next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Golang Patterns compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Golang Patterns this skillaffaan-m/ECC276k—~1.1kAutomated safety check: PassMIT
Golang Project Layoutcontext-labs/whip1.1k1 repos~1.8kAutomated safety check: PassMIT
Context Handling in fp-goIBM/fp-go2k—~4.2kAutomated safety check: PassApache-2.0
Typed Dependencies with fp-go EffectIBM/fp-go2k—~4.3kAutomated safety check: PassApache-2.0
fp-go Lenses for Go StructsIBM/fp-go2k—~4.3kAutomated safety check: PassApache-2.0
Golang Dependency Injectionsamber/cc-skills-golang3.4k—~3.2kAutomated safety check: PassMIT

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Works with

Categories

Questions about Golang Patterns

What does Golang Patterns do?

Go-specific design patterns and best practices including functional options, small interfaces, dependency injection, concurrency patterns, error handling, and package organization. Golang Patterns is an agent skill from affaan-m/ECC. Go-specific design patterns and best practices including functional options, small interfaces, dependency injection, concurrency patterns, error handling, and package organization.

When should I use Golang Patterns?

Golang Patterns fits situations like: working with Go code to apply idiomatic Go patterns; tasks that involve Design patterns.

How do I install Golang Patterns in Claude Code?

Run `npx skills add affaan-m/ECC --skill golang-patterns -a claude-code`. Or copy the skill folder (.kiro/skills/golang-patterns in affaan-m/ECC) into .claude/skills/golang-patterns in your project. Claude Code loads it when a task matches its description.

How do I install Golang Patterns in Codex?

Run `npx skills add affaan-m/ECC --skill golang-patterns -a codex`. Or copy the skill folder (.kiro/skills/golang-patterns in affaan-m/ECC) into .agents/skills/golang-patterns in your project. Codex loads it when a task matches its description.

Can I use Golang Patterns in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add affaan-m/ECC --skill golang-patterns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/golang-patterns, .gemini/skills/golang-patterns, .github/skills/golang-patterns and .opencode/skills/golang-patterns in your project.

What does Golang Patterns need to run?

SKILL.md names no scripts, command-line tools or credentials: Golang Patterns is instructions for the agent only.

Does Golang Patterns access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Golang Patterns safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Golang Patterns use?

Golang Patterns is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Golang Patterns use?

About 1.1k tokens (SKILL.md is roughly 4.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Golang Patterns?

Skills that share tags, products or a category with Golang Patterns: Golang Project Layout (context-labs/whip, 1.1k stars), Context Handling in fp-go (IBM/fp-go, 2k stars), Typed Dependencies with fp-go Effect (IBM/fp-go, 2k stars) and fp-go Lenses for Go Structs (IBM/fp-go, 2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Golang Patterns?

affaan-m (a GitHub user) maintains it in affaan-m/ECC, which has 276,111 GitHub stars. The repository holds 683 skills in this directory. The repository was last updated on October 10, 2026.

Source: affaan-m/ECC on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.