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go-project-layout

Scaffold new Go projects and services: directory structure, cmd/ and internal/ conventions, when to use a flat layout, module naming, and main package wiring. Use when: "new Go project", "scaffold a service", "create project structure", "start a Go module", "how do I organize a n

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Overview

Scaffold new Go projects and services: directory structure, cmd/ and internal/ conventions, when to use a flat layout, module naming, and main package wiring. Use when: "new Go project", "scaffold a service", "create project structure", "start a Go module", "how do I organize a new service", "set up folder structure". Not for: reviewing an existing architecture (go-architecture-review), DI wiring (go-dependency-injection), CI setup (go-ci).

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Go Project Layout

Structure follows size. The biggest layout mistake in Go is copying a microservice skeleton for a 500-line tool — or growing a 50-package service inside a flat directory. Match the layout to the project.

1. Pick the Layout by Project Size

ProjectLayout
Small tool, single binary, <5 filesFlat: everything in package main at the root
Library for others to importRoot package named after the module, internal/ for helpers
Service with one binarycmd/<name>/main.go + internal/ packages
Multiple binaries sharing codecmd/<name1>/, cmd/<name2>/ + internal/

Never start with empty pkg/, api/, docs/, build/ directories "for later". Add structure when the code demands it, not before.

2. Module Naming

# ✅ Good — repository path, lowercase
go mod init github.com/acme/payment-service

# ❌ Bad — not fetchable, uppercase, or vanity without DNS
go mod init PaymentService
go mod init payment_service

The last path element should match what users will see: for a library, it becomes the default import name.

3. Service Layout (the default for APIs and workers)

payment-service/
├── cmd/
│   └── payment-api/
│       └── main.go         # flag/env parsing, wiring, Run() — nothing else
├── internal/
│   ├── domain/             # core types, business rules; zero external deps
│   ├── service/            # use cases orchestrating domain + stores
│   ├── store/              # data access implementations (postgres/, redis/)
│   ├── handler/            # HTTP/gRPC adapters
│   └── config/             # config loading and validation
├── migrations/             # if the service owns a database
├── go.mod
├── Makefile
└── README.md

Rules:

  • internal/ by default — the compiler enforces that nobody outside the module imports it. Promote to a public package only on demand.
  • pkg/ only when external consumers exist AND the module also has private code. When in doubt, don't create it.
  • Dependencies point inward: handler → service → domain ← store. domain imports neither store nor handler.

4. Thin main, Runnable Run

Keep main.go to wiring plus a delegating call, so the app is testable:

func main() {
    if err := run(context.Background(), os.Args[1:], os.Getenv); err != nil {
        fmt.Fprintln(os.Stderr, err)
        os.Exit(1)
    }
}

func run(ctx context.Context, args []string, getenv func(string) string) error {
    cfg, err := config.Load(getenv)
    if err != nil {
        return fmt.Errorf("load config: %w", err)
    }

    db, err := store.Open(ctx, cfg.DatabaseURL)
    if err != nil {
        return fmt.Errorf("open db: %w", err)
    }
    defer db.Close()

    svc := service.New(store.NewUserRepo(db))
    srv := handler.NewServer(cfg.Addr, svc)
    return srv.ListenAndServe(ctx)
}
  • os.Exit appears exactly once, in main.
  • run takes its dependencies (args, getenv) so tests can call it.
  • No init() functions for wiring — explicit construction order only.

5. Library Layout

retry/
├── retry.go            # package retry — the API, in the root
├── retry_test.go
├── backoff.go          # same package, split by topic
├── internal/
│   └── clock/          # implementation details users must not import
├── examples_test.go    # Example* functions shown in godoc
└── go.mod
  • The root directory IS the package. No src/, no lib/.
  • One package per concept. Resist util, common, helpers — name packages after what they provide (retry, clock, httpsign).

6. Naming Rules for Directories and Packages

  • Package name == directory name, short, lowercase, no underscores: store/postgres, not store/postgres_impl.
  • Don't stutter: payment.Service, not payment.PaymentService.
  • Binary names in cmd/ are user-facing: cmd/payment-api, hyphenated is fine (directory only holds package main).

7. Files That Belong at the Root

  • go.mod, go.sum, README.md, LICENSE, Makefile, .golangci.yml, Dockerfile (single-binary projects).
  • Do NOT create: src/ (un-idiomatic), vendor/ (unless the team explicitly vendors), one-file packages like types/ or models/ that become dumping grounds.

Scaffolding Procedure

  1. Ask/decide: tool, library, or service? How many binaries?
  2. go mod init <repo-path>.
  3. Create only the directories the first feature needs.
  4. Write main.go with the thin-main pattern above.
  5. Add Makefile targets: build, test, lint.
  6. Verify: go build ./... and go vet ./... pass on the skeleton.

Verification Checklist

  1. Layout matches project size — no empty scaffolding directories
  2. Module path is the fetchable repository path
  3. All non-public packages live under internal/
  4. main.go is thin: parse, wire, call run, exit
  5. os.Exit only in main; no wiring in init()
  6. Dependencies flow inward; domain has zero infrastructure imports
  7. No util/common/helpers/models grab-bag packages
  8. Package names match directories, lowercase, no stutter
  9. go build ./... passes on the fresh skeleton
View source ↗
File metadata
name: go-project-layout
description: >
  Scaffold new Go projects and services: directory structure, cmd/ and
  internal/ conventions, when to use a flat layout, module naming, and main
  package wiring. Use when: "new Go project", "scaffold a service", "create
  project structure", "start a Go module", "how do I organize a new
  service", "set up folder structure".
  Not for: reviewing an existing architecture (go-architecture-review), DI
  wiring (go-dependency-injection), CI setup (go-ci).
user-invocable: true
license: MIT
compatibility: Designed for Claude Code or similar AI coding agents working on Go projects. Requires the Go toolchain. Requires git for repository initialisation.
allowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(gofmt:*) Bash(git:*)
metadata:
  author: eduardo-sl
  version: "1.1.1"
View original text
---
name: go-project-layout
description: >
  Scaffold new Go projects and services: directory structure, cmd/ and
  internal/ conventions, when to use a flat layout, module naming, and main
  package wiring. Use when: "new Go project", "scaffold a service", "create
  project structure", "start a Go module", "how do I organize a new
  service", "set up folder structure".
  Not for: reviewing an existing architecture (go-architecture-review), DI
  wiring (go-dependency-injection), CI setup (go-ci).
user-invocable: true
license: MIT
compatibility: Designed for Claude Code or similar AI coding agents working on Go projects. Requires the Go toolchain. Requires git for repository initialisation.
allowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(gofmt:*) Bash(git:*)
metadata:
  author: eduardo-sl
  version: "1.1.1"
---

# Go Project Layout

Structure follows size. The biggest layout mistake in Go is copying a
microservice skeleton for a 500-line tool — or growing a 50-package
service inside a flat directory. Match the layout to the project.

## 1. Pick the Layout by Project Size

| Project | Layout |
|---|---|
| Small tool, single binary, <5 files | Flat: everything in package `main` at the root |
| Library for others to import | Root package named after the module, `internal/` for helpers |
| Service with one binary | `cmd/<name>/main.go` + `internal/` packages |
| Multiple binaries sharing code | `cmd/<name1>/`, `cmd/<name2>/` + `internal/` |

Never start with empty `pkg/`, `api/`, `docs/`, `build/` directories
"for later". Add structure when the code demands it, not before.

## 2. Module Naming

```bash
# ✅ Good — repository path, lowercase
go mod init github.com/acme/payment-service

# ❌ Bad — not fetchable, uppercase, or vanity without DNS
go mod init PaymentService
go mod init payment_service
```

The last path element should match what users will see: for a library,
it becomes the default import name.

## 3. Service Layout (the default for APIs and workers)

```text
payment-service/
├── cmd/
│   └── payment-api/
│       └── main.go         # flag/env parsing, wiring, Run() — nothing else
├── internal/
│   ├── domain/             # core types, business rules; zero external deps
│   ├── service/            # use cases orchestrating domain + stores
│   ├── store/              # data access implementations (postgres/, redis/)
│   ├── handler/            # HTTP/gRPC adapters
│   └── config/             # config loading and validation
├── migrations/             # if the service owns a database
├── go.mod
├── Makefile
└── README.md
```

Rules:

- `internal/` by default — the compiler enforces that nobody outside the
  module imports it. Promote to a public package only on demand.
- `pkg/` only when external consumers exist AND the module also has
  private code. When in doubt, don't create it.
- Dependencies point inward: `handler → service → domain ← store`.
  `domain` imports neither `store` nor `handler`.

## 4. Thin main, Runnable Run

Keep `main.go` to wiring plus a delegating call, so the app is testable:

```go
func main() {
    if err := run(context.Background(), os.Args[1:], os.Getenv); err != nil {
        fmt.Fprintln(os.Stderr, err)
        os.Exit(1)
    }
}

func run(ctx context.Context, args []string, getenv func(string) string) error {
    cfg, err := config.Load(getenv)
    if err != nil {
        return fmt.Errorf("load config: %w", err)
    }

    db, err := store.Open(ctx, cfg.DatabaseURL)
    if err != nil {
        return fmt.Errorf("open db: %w", err)
    }
    defer db.Close()

    svc := service.New(store.NewUserRepo(db))
    srv := handler.NewServer(cfg.Addr, svc)
    return srv.ListenAndServe(ctx)
}
```

- `os.Exit` appears exactly once, in `main`.
- `run` takes its dependencies (`args`, `getenv`) so tests can call it.
- No `init()` functions for wiring — explicit construction order only.

## 5. Library Layout

```text
retry/
├── retry.go            # package retry — the API, in the root
├── retry_test.go
├── backoff.go          # same package, split by topic
├── internal/
│   └── clock/          # implementation details users must not import
├── examples_test.go    # Example* functions shown in godoc
└── go.mod
```

- The root directory IS the package. No `src/`, no `lib/`.
- One package per concept. Resist `util`, `common`, `helpers` — name
  packages after what they provide (`retry`, `clock`, `httpsign`).

## 6. Naming Rules for Directories and Packages

- Package name == directory name, short, lowercase, no underscores:
  `store/postgres`, not `store/postgres_impl`.
- Don't stutter: `payment.Service`, not `payment.PaymentService`.
- Binary names in `cmd/` are user-facing: `cmd/payment-api`,
  hyphenated is fine (directory only holds package `main`).

## 7. Files That Belong at the Root

- `go.mod`, `go.sum`, `README.md`, `LICENSE`, `Makefile`,
  `.golangci.yml`, `Dockerfile` (single-binary projects).
- Do NOT create: `src/` (un-idiomatic), `vendor/` (unless the team
  explicitly vendors), one-file packages like `types/` or `models/`
  that become dumping grounds.

## Scaffolding Procedure

1. Ask/decide: tool, library, or service? How many binaries?
2. `go mod init <repo-path>`.
3. Create only the directories the first feature needs.
4. Write `main.go` with the thin-main pattern above.
5. Add `Makefile` targets: `build`, `test`, `lint`.
6. Verify: `go build ./...` and `go vet ./...` pass on the skeleton.

## Verification Checklist

1. Layout matches project size — no empty scaffolding directories
2. Module path is the fetchable repository path
3. All non-public packages live under `internal/`
4. `main.go` is thin: parse, wire, call `run`, exit
5. `os.Exit` only in `main`; no wiring in `init()`
6. Dependencies flow inward; `domain` has zero infrastructure imports
7. No `util`/`common`/`helpers`/`models` grab-bag packages
8. Package names match directories, lowercase, no stutter
9. `go build ./...` passes on the fresh skeleton

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  • GitHub adoption: 71 GitHub stars
  • Stars/forks activity: 71 stars, 9 forks; issue activity unavailable in current metadata
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Source repository
eduardo-sl/go-agent-skills
License
MIT
Version
1.0.0
Last GitHub push
Aug 18, 2026
Registry updated
Sep 8, 2026
Instruction path
skills/(architecture)/go-project-layout/SKILL.md @ 50133c33a386

Version reported in registry metadata; check source releases before relying on it.

Quality

57/100

Promising

Trust

58/100

Do not auto-install

Audit

70/100

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  • AI review approval is missing
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  • Permission surface needs review: secrets or environment access, shell or command execution
  • GitHub adoption: 71 GitHub stars
  • Stars/forks activity: 71 stars, 9 forks; issue activity unavailable in current metadata
  • Dependency/runtime risk: command execution surface, credential or environment access
  • Permission surface: secrets or environment access, shell or command execution
  • Review status: AI review approval is missing
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      "riskBlocked": 0,
      "setupRequired": 0,
      "notRelevant": 0,
      "avgOutputQuality": null,
      "avgTimeToUsefulMs": null,
      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 70,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "AI review approval is missing",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "GitHub adoption: 71 GitHub stars",
      "Stars/forks activity: 71 stars, 9 forks; issue activity unavailable in current metadata",
      "Dependency/runtime risk: command execution surface, credential or environment access"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 57,
    "label": "Promising"
  },
  "supply": {
    "track": "Coding and developer agents",
    "scenario": "GitHub automation",
    "maintenance": "2mo since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "high-compliance environments without internal security review",
    "No OpenAgentSkill engagement data yet",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "AI review approval is missing",
    "Quality score needs review"
  ],
  "agent_contract": {
    "task_input": "Use go-project-layout in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 66/100 Manual review",
      "Audit: 70/100 Needs review",
      "Safety: 26/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "eduardo-sl-go-project-layout (go-project-layout)",
      "install_command": "npx skills add eduardo-sl/go-agent-skills --skill go-project-layout",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "eduardo-sl-go-project-layout",
      "task": "Use go-project-layout in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/eduardo-sl-go-project-layout",
    "api": "https://www.openagentskill.com/api/agent/skills/eduardo-sl-go-project-layout",
    "audit": "https://www.openagentskill.com/skills/eduardo-sl-go-project-layout/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=eduardo-sl-go-project-layout&task=Use%20go-project-layout%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20go-project-layout%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20go-project-layout%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/eduardo-sl-go-project-layout/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/eduardo-sl-go-project-layout"
  }
}

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eduardo-sl
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