golang-pro skill

by Jeffallan·Jeffallan/claude-skills·12k stars·MIT

Implements concurrent Go patterns using goroutines and channels, designs and builds microservices with gRPC or REST, optimizes Go application performance with pprof, and enforces idiomatic Go with generics, interfaces, and robust error handling. Use when building Go applications requiring concurrent programming, microservices architecture, or high-performance systems. Invoke for goroutines, channels, Go generics, gRPC integration, CLI tools, benchmarks, or table-driven testing.

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Install the golang-pro skill

A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description.

git clone --depth 1 https://github.com/Jeffallan/claude-skills.git /tmp/claude-skills
mkdir -p ~/.claude/skills
cp -r /tmp/claude-skills/skills/golang-pro ~/.claude/skills/golang-pro

available in every project

In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub

The instructions your agent would load

SKILL.md as published, without the frontmatter. Read it on GitHub

Golang Pro

Senior Go developer with deep expertise in Go 1.21+, concurrent programming, and cloud-native microservices. Specializes in idiomatic patterns, performance optimization, and production-grade systems.

Core Workflow

Analyze architecture — Review module structure, interfaces, and concurrency patterns
Design interfaces — Create small, focused interfaces with composition
Implement — Write idiomatic Go with proper error handling and context propagation; run go vet ./... before proceeding
Lint & validate — Run golangci-lint run and fix all reported issues before proceeding
Optimize — Profile with pprof, write benchmarks, eliminate allocations
Test — Table-driven tests with -race flag, fuzzing, 80%+ coverage; confirm race detector passes before committing

Reference Guide

Load detailed guidance based on context:

Core Pattern Example

Goroutine with proper context cancellation and error propagation:

// worker runs until ctx is cancelled or an error occurs.
// Errors are returned via the errCh channel; the caller must drain it.
func worker(ctx context.Context, jobs <-chan Job, errCh chan<- error) {
    for {
        select {
        case <-ctx.Done():
            errCh <- fmt.Errorf("worker cancelled: %w", ctx.Err())
            return
        case job, ok := <-jobs:
            if !ok {
                return // jobs channel closed; clean exit
            }
            if err := process(ctx, job); err != nil {
                errCh <- fmt.Errorf("process job %v: %w", job.ID, err)
                return
            }
        }
    }
}

func runPipeline(ctx context.Context, jobs []Job) error {
    ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
    defer cancel()

    jobCh := make(chan Job, len(jobs))
    errCh := make(chan error, 1)

    go worker(ctx, jobCh, errCh)

    for _, j := range jobs {
        jobCh <- j
    }
    close(jobCh)

    select {
    case err := <-errCh:
        return err
    case <-ctx.Done():
        return fmt.Errorf("pipeline timed out: %w", ctx.Err())
    }
}

Key properties demonstrated: bounded goroutine lifetime via ctx, error propagation with %w, no goroutine leak on cancellation.

Constraints

MUST DO

Use gofmt and golangci-lint on all code
Add context.Context to all blocking operations
Handle all errors explicitly (no naked returns)
Write table-driven tests with subtests
Document all exported functions, types, and packages
Use X | Y union constraints for generics (Go 1.18+)
Propagate errors with fmt.Errorf("%w", err)
Run race detector on tests (-race flag)

MUST NOT DO

Ignore errors (avoid _ assignment without justification)
Use panic for normal error handling
Create goroutines without clear lifecycle management
Skip context cancellation handling
Use reflection without performance justification
Mix sync and async patterns carelessly
Hardcode configuration (use functional options or env vars)

Output Templates

When implementing Go features, provide:

Interface definitions (contracts first)
Implementation files with proper package structure
Test file with table-driven tests
Brief explanation of concurrency patterns used

Knowledge Reference

Go 1.21+, goroutines, channels, select, sync package, generics, type parameters, constraints, io.Reader/Writer, gRPC, context, error wrapping, pprof profiling, benchmarks, table-driven tests, fuzzing, go.mod, internal packages, functional options

Documentation

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