Claude Code Go Module Development Guide

Go modules have become the standard for dependency management in Go projects. When paired with Claude Code’s AI capabilities, you can accelerate module development while maintaining code quality through automated testing and documentation workflows. This guide walks you through building Go modules with Claude Code, using specialized skills for testing, documentation, and project management.

Initializing Your Go Module

Start by creating a new Go module with proper initialization. The foundation of any Go module begins with a well-structured go.mod file:

mkdir myproject && cd myproject
go mod init github.com/yourusername/myproject

For projects requiring external dependencies, use semantic versioning in your go.mod:

module github.com/yourusername/myproject

go 1.21

require (
    github.com/stretchr/testify v1.8.4
    gopkg.in/yaml.v3 v3.0.1
)

Claude Code can help generate module structures automatically. When working on larger projects, consider using the tdd skill to establish test-driven development workflows from the start.

Structuring Your Module Architecture

A well-organized Go module follows Go conventions while maintaining clear separation of concerns. Here’s a practical project structure:

myproject/
├── cmd/
│   └── myproject/
│       └── main.go
├── internal/
│   ├── handlers/
│   │   └── handler.go
│   ├── models/
│   │   └── model.go
│   └── services/
│       └── service.go
├── pkg/
│   └── utils/
│       └── utils.go
├── go.mod
├── go.sum
└── Makefile

The cmd/ directory houses your application entry points, internal/ contains private application code, and pkg/ holds reusable packages others can import. This structure scales well for modules of any size.

When designing module APIs, think about backward compatibility. Use interfaces to define contracts between components, allowing internal implementations to change without breaking external consumers.

Writing Testable Code

Go’s testing package provides everything needed for unit testing. Write tests alongside your code:

package services

import (
    "testing"
    "github.com/stretchr/testify/assert"
)

func TestCalculateTotal(t *testing.T) {
    tests := []struct {
        name     string
        prices   []float64
        expected float64
    }{
        {"empty slice", []float64{}, 0},
        {"single item", []float64{10.50}, 10.50},
        {"multiple items", []float64{10.00, 20.00, 30.00}, 60.00},
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            result := CalculateTotal(tt.prices)
            assert.Equal(t, tt.expected, result)
        })
    }
}

The tdd skill enhances this workflow by suggesting test cases, generating assertions, and identifying edge cases you might miss. It integrates smoothly with table-driven testing patterns common in Go projects.

For integration testing, create a separate test file with the _integration.go suffix. This keeps unit tests fast while allowing comprehensive integration coverage.

Documenting Your Module

Good documentation makes your module usable. Go provides several documentation tools built into the language:

// Package mathutil provides arithmetic utilities for financial calculations.
//
// The functions in this package handle precision-aware decimal
// arithmetic to avoid floating-point errors common in currency
// calculations.
package mathutil

// Sum returns the total of all values in the slice.
// Returns 0 for empty slices.
func Sum(values []float64) float64 {
    total := 0.0
    for _, v := range values {
        total += v
    }
    return total
}

Run go doc to generate documentation from your code comments. For more comprehensive documentation, the pdf skill can help generate formatted documentation files for distribution.

Managing Dependencies Effectively

Go modules handle dependency versions through go.mod and go.sum. Keep dependencies minimal and audit them regularly:

# Check for outdated dependencies
go list -m -u all

# Remove unused dependencies
go mod tidy

# Verify dependencies
go mod verify

The supermemory skill can help track dependency updates across multiple modules, making it easier to maintain consistency in larger projects. It stores context about your project’s dependencies and reminds you when updates are available.

Building CLI Tools

Many Go modules expose command-line interfaces. Use the standard library’s flag or spf13’s cobra for more complex CLIs:

package main

import (
    "flag"
    "fmt"
    "os"
)

func main() {
    verbose := flag.Bool("v", false, "verbose output")
    config := flag.String("c", "config.yaml", "config file path")
    flag.Parse()

    if *verbose {
        fmt.Println("Running in verbose mode")
    }

    if err := run(*config); err != nil {
        fmt.Fprintf(os.Stderr, "Error: %v\n", err)
        os.Exit(1)
    }
}

func run(configPath string) error {
    // Application logic here
    return nil
}

When building CLIs, ensure proper error handling and exit codes. The frontend-design skill, while primarily for web projects, offers useful patterns for command-line user experience.

Versioning and Releases

Follow semantic versioning for Go modules. Use Git tags to mark releases:

git tag v1.0.0
git push origin v1.0.0

Go’s proxy automatically caches module versions. Ensure your go.mod specifies minimum compatible versions:

require (
    github.com/example/pkg v1.2.0
)

Avoid importing major versions (v2+) without the version suffix in the import path. This prevents accidental breaking changes.

Automating Workflows

Combine Claude Code skills for automated development workflows. Create a Makefile for common tasks:

.PHONY: test lint build docs

test:
    go test -v -race -coverprofile=coverage.out ./...

lint:
    golangci-lint run
    go vet ./...

build:
    go build -o bin/myproject ./cmd/myproject

docs:
    go doc -all > docs.md

The tdd skill can suggest improvements to your test coverage. For documentation generation, the pdf skill converts Go docs into shareable formats suitable for team distribution.

Conclusion

Building Go modules with Claude Code combines Go’s simplicity with AI-assisted development. Focus on clean package design, comprehensive testing, and clear documentation from the start. The skills ecosystem, including tdd, pdf, and supermemory, provides targeted assistance for different aspects of module development. Start with a solid foundation and iterate based on actual usage patterns.

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