go-interface-design: Security & Code Review for AI Agents | OpenAgentSkill

Overview

Go interface design patterns: implicit interfaces, consumer-side definition, interface compliance verification, composition, the accept-interfaces-return-structs principle, and common pitfalls. Use when designing interfaces, decoupling packages, defining contracts, reviewing interface usage, or refactoring for testability. Trigger examples: "design interface", "accept interfaces return structs", "interface compliance", "consumer-side interface", "interface composition". Not for: HTTP handler patterns (go-api-design), general review (go-code-review).

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Go Interface Design

Go interfaces are implicit. This is the single most important design feature of the language, and most people coming from Java or C# get it wrong at first.

1. The Cardinal Rule: Define Interfaces at the Consumer

The consumer of a behavior defines the interface, NOT the provider:

// ❌ Wrong — producer defines interface (Java thinking)
// package store
type UserStore interface {      // defined alongside implementation
    GetByID(ctx context.Context, id string) (*User, error)
    Create(ctx context.Context, user *User) error
    // ... 15 more methods
}

type PostgresStore struct { ... }
func (s *PostgresStore) GetByID(...) { ... }
func (s *PostgresStore) Create(...) { ... }

// ✅ Right — consumer defines what it needs
// package service
type UserReader interface {     // only what THIS service needs
    GetByID(ctx context.Context, id string) (*domain.User, error)
}

type UserService struct {
    store UserReader  // depends on narrow interface
}

// package store (no interface defined here)
type PostgresStore struct { db *sql.DB }
func (s *PostgresStore) GetByID(ctx context.Context, id string) (*domain.User, error) { ... }
func (s *PostgresStore) Create(ctx context.Context, user *domain.User) error { ... }

// PostgresStore satisfies service.UserReader implicitly — no declaration needed

Why this matters:

Consumer depends only on what it uses (Interface Segregation Principle).
Producer can add methods without breaking consumers.
Testing requires only the methods the consumer calls.
No import cycle: consumer doesn't import producer's package.

2. Keep Interfaces Small

The bigger the interface, the weaker the abstraction.

// ✅ Good — focused, composable
type Reader interface {
    Read(p []byte) (n int, err error)
}

type Writer interface {
    Write(p []byte) (n int, err error)
}

type ReadWriter interface {
    Reader
    Writer
}

// ❌ Bad — kitchen sink interface
type FileManager interface {
    Read(path string) ([]byte, error)
    Write(path string, data []byte) error
    Delete(path string) error
    List(dir string) ([]string, error)
    Move(src, dst string) error
    Copy(src, dst string) error
    Stat(path string) (os.FileInfo, error)
    Watch(path string) (<-chan Event, error)
}

Guideline: 1-3 methods is ideal. If you need more, compose smaller interfaces.

3. Accept Interfaces, Return Structs

// ✅ Good — accepts interface, returns concrete type
func NewUserService(store UserReader, logger Logger) *UserService {
    return &UserService{store: store, logger: logger}
}

// ❌ Bad — returns interface (hides the concrete type for no reason)
func NewUserService(store UserReader) UserServiceInterface {
    return &UserService{store: store}
}

Return a concrete type so callers get full access to the type's methods. Returning an interface only makes sense when the function genuinely returns different concrete types based on input (factory pattern).

4. Verify Interface Compliance at Compile Time

Use the blank identifier assignment to catch broken contracts early:

// Verify *PostgresStore implements service.UserReader at compile time
var _ service.UserReader = (*PostgresStore)(nil)

// Verify LogHandler implements http.Handler
var _ http.Handler = (*LogHandler)(nil)

// For value receivers:
var _ fmt.Stringer = Status(0)

Place these immediately after the type declaration. They cost nothing at runtime and prevent silent contract breakage.

5. Don't Use Pointers to Interfaces

// ❌ Bad — pointer to interface is almost never correct
func process(r *io.Reader) { ... }

// ✅ Good — interface is already a pointer internally
func process(r io.Reader) { ... }

An interface value is internally two pointers (type + data). A pointer to an interface is a pointer to a pointer — needless indirection.

The only exception: when you need to replace the interface value itself (swap the implementation at runtime), which is extremely rare.

6. The Empty Interface

interface{} (or any in Go 1.18+) means you've given up on type safety. Use it sparingly:

// ✅ Acceptable — generic container before generics / stdlib compatibility
func Marshal(v any) ([]byte, error)

// ✅ Better (Go 1.18+) — use generics instead of any
func Map[T, U any](slice []T, fn func(T) U) []U { ... }

// ❌ Bad — lazy interface design
func Process(data any) any { ... } // what does this even do?

7. Functional Options Pattern

When a constructor needs optional configuration, use functional options instead of a config struct with an interface:

type Option func(*Server)

func WithTimeout(d time.Duration) Option {
    return func(s *Server) { s.timeout = d }
}

func WithLogger(l Logger) Option {
    return func(s *Server) { s.logger = l }
}

func NewServer(addr string, opts ...Option) *Server {
    s := &Server{
        addr:    addr,
        timeout: 30 * time.Second,  // sensible default
        logger:  slog.Default(),    // default stdlib logger
    }
    for _, opt := range opts {
        opt(s)
    }
    return s
}

// Usage
srv := NewServer(":8080",
    WithTimeout(60 * time.Second),
    WithLogger(logger),
)

8. Common Interface Anti-Patterns

Premature interfaces:

// ❌ Bad — interface defined before second implementation exists
type Processor interface {
    Process(ctx context.Context, data []byte) error
}

type processor struct { ... }  // only one implementation ever

// ✅ Good — use concrete type until you need the abstraction
type Processor struct { ... }
// Add interface when you have 2+ implementations or need testing seam

"Don't design with interfaces, discover them." — Rob Pike

Interface pollution:

// ❌ Bad — wrapping every struct in an interface "for testability"
type UserServiceInterface interface { ... }
type OrderServiceInterface interface { ... }
type PaymentServiceInterface interface { ... }
// 50 more interfaces with exactly one implementation each

// ✅ Good — define interfaces where they're consumed
// Each consumer declares only the methods IT needs

Misusing interfaces for enums:

// ❌ Bad — interface used as enum/sum type
type Shape interface {
    isShape()
}
type Circle struct{}
func (Circle) isShape() {}

// ✅ Better — sealed interface pattern (if you need it)
// Or just use constants with a type
type ShapeKind int
const (
    ShapeCircle ShapeKind = iota
    ShapeRectangle
)

Decision Checklist

Do I need an interface here? — Only if you have 2+ implementations, need a testing seam, or are crossing a package boundary.
Where should it be defined? — At the consumer, not the producer.
How many methods? — Fewer is better. 1-3 is ideal.
Am I returning an interface? — Probably shouldn't. Return concrete.
Have I verified compliance? — var _ Interface = (*Type)(nil)

View source ↗

File metadata

name: go-interface-design
description: >
  Go interface design patterns: implicit interfaces, consumer-side
  definition, interface compliance verification, composition, the
  accept-interfaces-return-structs principle, and common pitfalls. Use when
  designing interfaces, decoupling packages, defining contracts, reviewing
  interface usage, or refactoring for testability. Trigger examples: "design
  interface", "accept interfaces return structs", "interface compliance",
  "consumer-side interface", "interface composition".
  Not for: HTTP handler patterns (go-api-design), general review
  (go-code-review).
user-invocable: true
license: MIT
compatibility: Designed for Claude Code or similar AI coding agents working on Go projects. Requires the Go toolchain.
allowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(gofmt:*)
metadata:
  author: eduardo-sl
  version: "1.1.1"

View original text

---
name: go-interface-design
description: >
  Go interface design patterns: implicit interfaces, consumer-side
  definition, interface compliance verification, composition, the
  accept-interfaces-return-structs principle, and common pitfalls. Use when
  designing interfaces, decoupling packages, defining contracts, reviewing
  interface usage, or refactoring for testability. Trigger examples: "design
  interface", "accept interfaces return structs", "interface compliance",
  "consumer-side interface", "interface composition".
  Not for: HTTP handler patterns (go-api-design), general review
  (go-code-review).
user-invocable: true
license: MIT
compatibility: Designed for Claude Code or similar AI coding agents working on Go projects. Requires the Go toolchain.
allowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(gofmt:*)
metadata:
  author: eduardo-sl
  version: "1.1.1"
---

# Go Interface Design

Go interfaces are implicit. This is the single most important design feature
of the language, and most people coming from Java or C# get it wrong at first.

## 1. The Cardinal Rule: Define Interfaces at the Consumer

The consumer of a behavior defines the interface, NOT the provider:

```go
// ❌ Wrong — producer defines interface (Java thinking)
// package store
type UserStore interface {      // defined alongside implementation
    GetByID(ctx context.Context, id string) (*User, error)
    Create(ctx context.Context, user *User) error
    // ... 15 more methods
}

type PostgresStore struct { ... }
func (s *PostgresStore) GetByID(...) { ... }
func (s *PostgresStore) Create(...) { ... }

// ✅ Right — consumer defines what it needs
// package service
type UserReader interface {     // only what THIS service needs
    GetByID(ctx context.Context, id string) (*domain.User, error)
}

type UserService struct {
    store UserReader  // depends on narrow interface
}

// package store (no interface defined here)
type PostgresStore struct { db *sql.DB }
func (s *PostgresStore) GetByID(ctx context.Context, id string) (*domain.User, error) { ... }
func (s *PostgresStore) Create(ctx context.Context, user *domain.User) error { ... }

// PostgresStore satisfies service.UserReader implicitly — no declaration needed
```

Why this matters:
- Consumer depends only on what it uses (Interface Segregation Principle).
- Producer can add methods without breaking consumers.
- Testing requires only the methods the consumer calls.
- No import cycle: consumer doesn't import producer's package.

## 2. Keep Interfaces Small

The bigger the interface, the weaker the abstraction.

```go
// ✅ Good — focused, composable
type Reader interface {
    Read(p []byte) (n int, err error)
}

type Writer interface {
    Write(p []byte) (n int, err error)
}

type ReadWriter interface {
    Reader
    Writer
}

// ❌ Bad — kitchen sink interface
type FileManager interface {
    Read(path string) ([]byte, error)
    Write(path string, data []byte) error
    Delete(path string) error
    List(dir string) ([]string, error)
    Move(src, dst string) error
    Copy(src, dst string) error
    Stat(path string) (os.FileInfo, error)
    Watch(path string) (<-chan Event, error)
}
```

Guideline: 1-3 methods is ideal. If you need more, compose smaller interfaces.

## 3. Accept Interfaces, Return Structs

```go
// ✅ Good — accepts interface, returns concrete type
func NewUserService(store UserReader, logger Logger) *UserService {
    return &UserService{store: store, logger: logger}
}

// ❌ Bad — returns interface (hides the concrete type for no reason)
func NewUserService(store UserReader) UserServiceInterface {
    return &UserService{store: store}
}
```

Return a concrete type so callers get full access to the type's methods.
Returning an interface only makes sense when the function genuinely
returns different concrete types based on input (factory pattern).

## 4. Verify Interface Compliance at Compile Time

Use the blank identifier assignment to catch broken contracts early:

```go
// Verify *PostgresStore implements service.UserReader at compile time
var _ service.UserReader = (*PostgresStore)(nil)

// Verify LogHandler implements http.Handler
var _ http.Handler = (*LogHandler)(nil)

// For value receivers:
var _ fmt.Stringer = Status(0)
```

Place these immediately after the type declaration. They cost nothing
at runtime and prevent silent contract breakage.

## 5. Don't Use Pointers to Interfaces

```go
// ❌ Bad — pointer to interface is almost never correct
func process(r *io.Reader) { ... }

// ✅ Good — interface is already a pointer internally
func process(r io.Reader) { ... }
```

An interface value is internally two pointers (type + data).
A pointer to an interface is a pointer to a pointer — needless indirection.

The only exception: when you need to replace the interface value itself
(swap the implementation at runtime), which is extremely rare.

## 6. The Empty Interface

`interface{}` (or `any` in Go 1.18+) means you've given up on type safety.
Use it sparingly:

```go
// ✅ Acceptable — generic container before generics / stdlib compatibility
func Marshal(v any) ([]byte, error)

// ✅ Better (Go 1.18+) — use generics instead of any
func Map[T, U any](slice []T, fn func(T) U) []U { ... }

// ❌ Bad — lazy interface design
func Process(data any) any { ... } // what does this even do?
```

## 7. Functional Options Pattern

When a constructor needs optional configuration, use functional options
instead of a config struct with an interface:

```go
type Option func(*Server)

func WithTimeout(d time.Duration) Option {
    return func(s *Server) { s.timeout = d }
}

func WithLogger(l Logger) Option {
    return func(s *Server) { s.logger = l }
}

func NewServer(addr string, opts ...Option) *Server {
    s := &Server{
        addr:    addr,
        timeout: 30 * time.Second,  // sensible default
        logger:  slog.Default(),    // default stdlib logger
    }
    for _, opt := range opts {
        opt(s)
    }
    return s
}

// Usage
srv := NewServer(":8080",
    WithTimeout(60 * time.Second),
    WithLogger(logger),
)
```

## 8. Common Interface Anti-Patterns

### Premature interfaces:

```go
// ❌ Bad — interface defined before second implementation exists
type Processor interface {
    Process(ctx context.Context, data []byte) error
}

type processor struct { ... }  // only one implementation ever

// ✅ Good — use concrete type until you need the abstraction
type Processor struct { ... }
// Add interface when you have 2+ implementations or need testing seam
```

"Don't design with interfaces, discover them." — Rob Pike

### Interface pollution:

```go
// ❌ Bad — wrapping every struct in an interface "for testability"
type UserServiceInterface interface { ... }
type OrderServiceInterface interface { ... }
type PaymentServiceInterface interface { ... }
// 50 more interfaces with exactly one implementation each

// ✅ Good — define interfaces where they're consumed
// Each consumer declares only the methods IT needs
```

### Misusing interfaces for enums:

```go
// ❌ Bad — interface used as enum/sum type
type Shape interface {
    isShape()
}
type Circle struct{}
func (Circle) isShape() {}

// ✅ Better — sealed interface pattern (if you need it)
// Or just use constants with a type
type ShapeKind int
const (
    ShapeCircle ShapeKind = iota
    ShapeRectangle
)
```

## Decision Checklist

1. **Do I need an interface here?** — Only if you have 2+ implementations,
   need a testing seam, or are crossing a package boundary.
2. **Where should it be defined?** — At the consumer, not the producer.
3. **How many methods?** — Fewer is better. 1-3 is ideal.
4. **Am I returning an interface?** — Probably shouldn't. Return concrete.
5. **Have I verified compliance?** — `var _ Interface = (*Type)(nil)`

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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-interface-design/SKILL.md @ 50133c33a386

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      "Permission surface needs review: shell or command execution, network or browser access",
      "GitHub adoption: 71 GitHub stars",
      "Stars/forks activity: 71 stars, 9 forks; issue activity unavailable in current metadata",
      "Dependency/runtime risk: command execution surface, external package install surface"
    ]
  },
  "agent_proven": {
    "version": "agent-proven-v1",
    "score": 0,
    "tier": "unproven",
    "label": "Needs first agent run",
    "summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
    "metrics": {
      "totalOutcomes": 0,
      "successfulOutcomes": 0,
      "failedOutcomes": 0,
      "installAttempts": 0,
      "installSuccessRate": null,
      "successRate": null,
      "recentSuccessRate": null,
      "recentFailureRate": null,
      "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": 71,
    "risk_level": "risky",
    "risk_label": "Risky",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "Financial research output is not financial advice; require human review before any live investment decision",
      "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
      "AI review approval is missing",
      "Financial research output is not financial advice; require human review before any live investment decision.",
      "This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
      "Quality score needs review"
    ]
  },
  "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": "Coding agents",
    "maintenance": "1mo since push",
    "risk": "Risky"
  },
  "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",
    "Audit risk risky exceeds max_risk=medium",
    "High-risk permission hints: Shell or command execution",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Financial research output is not financial advice; require human review before any live investment decision"
  ],
  "agent_contract": {
    "task_input": "Use go-interface-design 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: 69/100 Manual review",
      "Audit: 71/100 Risky",
      "Safety: 43/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "eduardo-sl-go-interface-design (go-interface-design)",
      "install_command": "npx skills add eduardo-sl/go-agent-skills --skill go-interface-design",
      "risk_summary": "Risky; 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-interface-design",
      "task": "Use go-interface-design 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-interface-design",
    "api": "https://www.openagentskill.com/api/agent/skills/eduardo-sl-go-interface-design",
    "audit": "https://www.openagentskill.com/skills/eduardo-sl-go-interface-design/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=eduardo-sl-go-interface-design&task=Use%20go-interface-design%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20go-interface-design%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20go-interface-design%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/eduardo-sl-go-interface-design/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/eduardo-sl-go-interface-design"
  }
}

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Creator: eduardo-sl
Source: eduardo-sl/go-agent-skills
Indexed by: OpenAgentSkill community index

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