golang-samber-do: Coding Workflows for AI Agents | OpenAgentSkill

Overview

Dependency injection in Golang using samber/do — service containers, lifecycle management, scopes, health checks, graceful shutdown, and module organization. Apply when using or adopting samber/do, when the codebase imports github.com/samber/do or github.com/samber/do/v2, or when refactoring manual constructor injection into a DI container.

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Persona: You are a Go architect setting up dependency injection. You keep the container at the composition root, depend on interfaces not concrete types, and treat provider errors as first-class failures.

Using samber/do for Dependency Injection in Go

Type-safe dependency injection toolkit for Go based on Go 1.18+ generics.

Official Resources:

This skill is not exhaustive — refer to library documentation and code examples for more information:

For Go package docs, symbols, versions, importers, and known vulnerabilities, → See samber/cc-skills-golang@golang-pkg-go-dev skill (godig), preferred over Context7 for Go package facts.
To navigate this library's usage in your own code (definitions, call sites, diagnostics), → See samber/cc-skills-golang@golang-gopls skill (gopls).
Context7 remains a fallback for docs not indexed on pkg.go.dev.

Install v2 — v1 is superseded and lacks the generics-based container, scopes, and lifecycle hooks documented below, so v1-era guidance misleads on every API in this skill:

go get -u github.com/samber/do/v2

Core Concepts

The Injector (Container)

import "github.com/samber/do/v2"

injector := do.New()

Service Types

Lazy (default): Created when first requested
Eager: Created immediately when the container starts
Transient: New instance created on every request
Value: Pre-created value, no instantiation

Provider Functions

Services MUST be registered via provider functions:

type Provider[T any] func(i Injector) (T, error)

Basic Usage

1. Define and Register Services

Follow "Accept Interfaces, Return Structs":

// Register a service (lazy by default)
do.Provide(injector, func(i do.Injector) (Database, error) {
    return &PostgreSQLDatabase{connString: "postgres://..."}, nil
})

// Register a pre-created value
do.ProvideValue(injector, &Config{Port: 8080})

// Register a transient service (new instance each time)
do.ProvideTransient(injector, func(i do.Injector) (*Logger, error) {
    return &Logger{}, nil
})

// Register an eager service (created immediately at startup)
do.ProvideValue(injector, &Config{Port: 8080})

2. Invoke Services

The container MUST only be accessed at the composition root:

// Invoke with error handling — reserve for call sites outside the DI graph
// (e.g. an HTTP handler that must degrade gracefully instead of crashing)
db, err := do.Invoke[Database](injector)

// MustInvoke panics on error — preferred in providers, recovered by do.Invoke on the parent call
db := do.MustInvoke[Database](injector)

Inside a provider function, always use do.MustInvoke (or MustInvokeAs/MustInvokeNamed/MustInvokeStruct) rather than the error-returning variant:

A provider already returns (T, error), so propagating a dependency failure with do.Invoke costs an extra if err != nil { return nil, err } on every call.
do.MustInvoke panics instead, but samber/do correctly catches and recovers that panic at the enclosing Invoke call and converts it back into a regular error — this recover happens inside the library itself, not in caller code, so MustInvoke is safe to use inside providers.
The failure still surfaces as an error at the composition root, just without the manual boilerplate in every provider.

3. Service Dependencies

func NewUserService(i do.Injector) (UserService, error) {
    db := do.MustInvoke[Database](i)
    cache := do.MustInvoke[Cache](i)
    return &userService{db: db, cache: cache}, nil
}

do.Provide(injector, NewUserService)

4. Implicit Aliasing (Preferred)

// Register concrete type
do.Provide(injector, func(i do.Injector) (*PostgreSQLDatabase, error) {
    return &PostgreSQLDatabase{}, nil
})

// Invoke directly as interface (implicit aliasing)
db := do.MustInvokeAs[Database](injector)

5. Named Services

do.ProvideNamed(injector, "primary-db", func(i do.Injector) (*Database, error) {
    return &Database{URL: "postgres://primary..."}, nil
})

mainDB := do.MustInvokeNamed[*Database](injector, "primary-db")

Package Organization

Use do.Package() to organize service registration by module:

// infrastructure/package.go
var Package = do.Package(
    do.Lazy(func(i do.Injector) (*postgres.DB, error) {
        cfg := do.MustInvoke[*Config](i)
        return postgres.Connect(cfg.DatabaseURL)
    }),
    do.Lazy(func(i do.Injector) (*redis.Client, error) {
        cfg := do.MustInvoke[*Config](i)
        return redis.NewClient(cfg.RedisURL), nil
    }),
)

// main.go
injector := do.New(infrastructure.Package, service.Package)

Full Application Setup

func main() {
    injector := do.New(
        infrastructure.Package,
        repository.Package,
        service.Package,
        transport.Package,
    )

    server := do.MustInvoke[*http.Server](injector)
    go server.ListenAndServe()

    _ = injector.ShutdownOnSignalsWithContext(context.Background(), os.Interrupt)
}

Best Practices

Depend on interfaces, not concrete types — lets you swap implementations in tests without touching production code
Each service should have one job — services with multiple responsibilities are harder to test and harder to replace
Keep dependency trees shallow — chains beyond 3-4 levels make initialization order fragile and errors harder to trace
Handle errors in provider functions — a silently failing provider creates a broken service that crashes later in unexpected places
Use scopes to organize services by lifecycle — request-scoped services prevent leaks, global services prevent redundant initialization
Use do.MustInvoke* inside provider functions instead of do.Invoke* — samber/do correctly catches and recovers the panic at the outer Invoke call, turning it back into a returned error, so it's safe to use inside providers and you get the same error propagation without the boilerplate

For scopes, lifecycle management, struct injection, and debugging, see Advanced Usage.

For testing patterns (cloning, overrides, mocks), see Testing.

Quick Reference

Registration

Function	Purpose
`do.Provide[T]()`	Register lazy service (default)
`do.ProvideNamed[T]()`	Register named lazy service
`do.ProvideValue[T]()`	Register pre-created value
`do.ProvideNamedValue[T]()`	Register named value
`do.ProvideTransient[T]()`	Register new instance each time
`do.ProvideNamedTransient[T]()`	Register named transient service
`do.Package()`	Group service registrations

Invocation

Function	Purpose
`do.Invoke[T]()`	Get service (with error)
`do.InvokeNamed[T]()`	Get named service
`do.InvokeAs[T]()`	Get first service matching interface
`do.InvokeStruct[T]()`	Inject into struct fields using tags
`do.MustInvoke[T]()`	Get service (panic on error)
`do.MustInvokeNamed[T]()`	Get named service (panic on error)
`do.MustInvokeAs[T]()`	Get service by interface (panic on error)
`do.MustInvokeStruct[T]()`	Inject into struct (panic on error)

Cross-References

→ See samber/cc-skills-golang@golang-dependency-injection skill for DI concepts, comparison, and when to adopt a DI library
→ See samber/cc-skills-golang@golang-structs-interfaces skill for interface design patterns
→ See samber/cc-skills-golang@golang-testing skill for general testing patterns

View source ↗

File metadata

name: golang-samber-do
description: "Dependency injection in Golang using samber/do — service containers, lifecycle management, scopes, health checks, graceful shutdown, and module organization. Apply when using or adopting samber/do, when the codebase imports github.com/samber/do or github.com/samber/do/v2, or when refactoring manual constructor injection into a DI container."
user-invocable: true
license: MIT
compatibility: Designed for Claude Code, Codex or similar harness, and for projects using Golang.
metadata:
  author: samber
  version: "1.3.2"
  openclaw:
    emoji: "💉"
    homepage: https://github.com/samber/cc-skills-golang
    requires:
      bins:
        - go
    install: []
    skill-library-version: "2.0.0"
allowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(golangci-lint:*) Bash(git:*) Agent WebFetch mcp__context7__resolve-library-id mcp__context7__query-docs Bash(godig:*) Bash(gopls:*) LSP mcp__gopls__*
paths:
  - "**/*.go"

View original text

---
name: golang-samber-do
description: "Dependency injection in Golang using samber/do — service containers, lifecycle management, scopes, health checks, graceful shutdown, and module organization. Apply when using or adopting samber/do, when the codebase imports github.com/samber/do or github.com/samber/do/v2, or when refactoring manual constructor injection into a DI container."
user-invocable: true
license: MIT
compatibility: Designed for Claude Code, Codex or similar harness, and for projects using Golang.
metadata:
  author: samber
  version: "1.3.2"
  openclaw:
    emoji: "💉"
    homepage: https://github.com/samber/cc-skills-golang
    requires:
      bins:
        - go
    install: []
    skill-library-version: "2.0.0"
allowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(golangci-lint:*) Bash(git:*) Agent WebFetch mcp__context7__resolve-library-id mcp__context7__query-docs Bash(godig:*) Bash(gopls:*) LSP mcp__gopls__*
paths:
  - "**/*.go"
---

**Persona:** You are a Go architect setting up dependency injection. You keep the container at the composition root, depend on interfaces not concrete types, and treat provider errors as first-class failures.

# Using samber/do for Dependency Injection in Go

Type-safe dependency injection toolkit for Go based on Go 1.18+ generics.

**Official Resources:**

- [pkg.go.dev/github.com/samber/do/v2](https://pkg.go.dev/github.com/samber/do/v2)
- [do.samber.dev](https://do.samber.dev)
- [github.com/samber/do/v2](https://github.com/samber/do)

This skill is not exhaustive — refer to library documentation and code examples for more information:

- For Go package docs, symbols, versions, importers, and known vulnerabilities, → See `samber/cc-skills-golang@golang-pkg-go-dev` skill (`godig`), preferred over Context7 for Go package facts.
- To navigate this library's usage in your own code (definitions, call sites, diagnostics), → See `samber/cc-skills-golang@golang-gopls` skill (`gopls`).
- Context7 remains a fallback for docs not indexed on pkg.go.dev.

Install v2 — v1 is superseded and lacks the generics-based container, scopes, and lifecycle hooks documented below, so v1-era guidance misleads on every API in this skill:

```bash
go get -u github.com/samber/do/v2
```

## Core Concepts

### The Injector (Container)

```go
import "github.com/samber/do/v2"

injector := do.New()
```

### Service Types

- **Lazy** (default): Created when first requested
- **Eager**: Created immediately when the container starts
- **Transient**: New instance created on every request
- **Value**: Pre-created value, no instantiation

### Provider Functions

Services MUST be registered via provider functions:

```go
type Provider[T any] func(i Injector) (T, error)
```

## Basic Usage

### 1. Define and Register Services

Follow "Accept Interfaces, Return Structs":

```go
// Register a service (lazy by default)
do.Provide(injector, func(i do.Injector) (Database, error) {
    return &PostgreSQLDatabase{connString: "postgres://..."}, nil
})

// Register a pre-created value
do.ProvideValue(injector, &Config{Port: 8080})

// Register a transient service (new instance each time)
do.ProvideTransient(injector, func(i do.Injector) (*Logger, error) {
    return &Logger{}, nil
})

// Register an eager service (created immediately at startup)
do.ProvideValue(injector, &Config{Port: 8080})
```

### 2. Invoke Services

The container MUST only be accessed at the composition root:

```go
// Invoke with error handling — reserve for call sites outside the DI graph
// (e.g. an HTTP handler that must degrade gracefully instead of crashing)
db, err := do.Invoke[Database](injector)

// MustInvoke panics on error — preferred in providers, recovered by do.Invoke on the parent call
db := do.MustInvoke[Database](injector)
```

Inside a provider function, always use `do.MustInvoke` (or `MustInvokeAs`/`MustInvokeNamed`/`MustInvokeStruct`) rather than the error-returning variant:

- A provider already returns `(T, error)`, so propagating a dependency failure with `do.Invoke` costs an extra `if err != nil { return nil, err }` on every call.
- `do.MustInvoke` panics instead, but samber/do correctly catches and recovers that panic at the enclosing `Invoke` call and converts it back into a regular error — this recover happens inside the library itself, not in caller code, so `MustInvoke` is safe to use inside providers.
- The failure still surfaces as an error at the composition root, just without the manual boilerplate in every provider.

### 3. Service Dependencies

```go
func NewUserService(i do.Injector) (UserService, error) {
    db := do.MustInvoke[Database](i)
    cache := do.MustInvoke[Cache](i)
    return &userService{db: db, cache: cache}, nil
}

do.Provide(injector, NewUserService)
```

### 4. Implicit Aliasing (Preferred)

Register a concrete type and invoke as an interface without explicit aliasing:

```go
// Register concrete type
do.Provide(injector, func(i do.Injector) (*PostgreSQLDatabase, error) {
    return &PostgreSQLDatabase{}, nil
})

// Invoke directly as interface (implicit aliasing)
db := do.MustInvokeAs[Database](injector)
```

### 5. Named Services

Register multiple services of the same type:

```go
do.ProvideNamed(injector, "primary-db", func(i do.Injector) (*Database, error) {
    return &Database{URL: "postgres://primary..."}, nil
})

mainDB := do.MustInvokeNamed[*Database](injector, "primary-db")
```

## Package Organization

Use `do.Package()` to organize service registration by module:

```go
// infrastructure/package.go
var Package = do.Package(
    do.Lazy(func(i do.Injector) (*postgres.DB, error) {
        cfg := do.MustInvoke[*Config](i)
        return postgres.Connect(cfg.DatabaseURL)
    }),
    do.Lazy(func(i do.Injector) (*redis.Client, error) {
        cfg := do.MustInvoke[*Config](i)
        return redis.NewClient(cfg.RedisURL), nil
    }),
)

// main.go
injector := do.New(infrastructure.Package, service.Package)
```

## Full Application Setup

```go
func main() {
    injector := do.New(
        infrastructure.Package,
        repository.Package,
        service.Package,
        transport.Package,
    )

    server := do.MustInvoke[*http.Server](injector)
    go server.ListenAndServe()

    _ = injector.ShutdownOnSignalsWithContext(context.Background(), os.Interrupt)
}
```

## Best Practices

1. Depend on interfaces, not concrete types — lets you swap implementations in tests without touching production code
2. Each service should have one job — services with multiple responsibilities are harder to test and harder to replace
3. Keep dependency trees shallow — chains beyond 3-4 levels make initialization order fragile and errors harder to trace
4. Handle errors in provider functions — a silently failing provider creates a broken service that crashes later in unexpected places
5. Use scopes to organize services by lifecycle — request-scoped services prevent leaks, global services prevent redundant initialization
6. Use `do.MustInvoke*` inside provider functions instead of `do.Invoke*` — samber/do correctly catches and recovers the panic at the outer `Invoke` call, turning it back into a returned error, so it's safe to use inside providers and you get the same error propagation without the boilerplate

For scopes, lifecycle management, struct injection, and debugging, see [Advanced Usage](./references/advanced.md).

For testing patterns (cloning, overrides, mocks), see [Testing](./references/testing.md).

## Quick Reference

### Registration

| Function                        | Purpose                          |
| ------------------------------- | -------------------------------- |
| `do.Provide[T]()`               | Register lazy service (default)  |
| `do.ProvideNamed[T]()`          | Register named lazy service      |
| `do.ProvideValue[T]()`          | Register pre-created value       |
| `do.ProvideNamedValue[T]()`     | Register named value             |
| `do.ProvideTransient[T]()`      | Register new instance each time  |
| `do.ProvideNamedTransient[T]()` | Register named transient service |
| `do.Package()`                  | Group service registrations      |

### Invocation

| Function                   | Purpose                                   |
| -------------------------- | ----------------------------------------- |
| `do.Invoke[T]()`           | Get service (with error)                  |
| `do.InvokeNamed[T]()`      | Get named service                         |
| `do.InvokeAs[T]()`         | Get first service matching interface      |
| `do.InvokeStruct[T]()`     | Inject into struct fields using tags      |
| `do.MustInvoke[T]()`       | Get service (panic on error)              |
| `do.MustInvokeNamed[T]()`  | Get named service (panic on error)        |
| `do.MustInvokeAs[T]()`     | Get service by interface (panic on error) |
| `do.MustInvokeStruct[T]()` | Inject into struct (panic on error)       |

## Cross-References

- → See `samber/cc-skills-golang@golang-dependency-injection` skill for DI concepts, comparison, and when to adopt a DI library
- → See `samber/cc-skills-golang@golang-structs-interfaces` skill for interface design patterns
- → See `samber/cc-skills-golang@golang-testing` skill for general testing patterns

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Source repository: samber/cc-skills-golang
License: MIT
Version: 1.3.2
Last GitHub push: Sep 7, 2026
Registry updated: Sep 15, 2026
Instruction path: skills/golang-samber-do/SKILL.md @ 19a0626ae856

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

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      "install_success_rate": null,
      "risk_blocked": 0,
      "setup_required": 0,
      "avg_output_quality": null,
      "production_outcomes": 0,
      "last_outcome_at": null,
      "label": "No agent outcome data yet"
    },
    "auto_install": {
      "allowed": false,
      "sandbox_required": true,
      "reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
    },
    "best_for": [
      "coding-agents",
      "agent-skill"
    ],
    "known_risks": [
      "AI review approval is missing",
      "This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
      "Quality score needs review",
      "Permission surface needs review: shell or command execution, filesystem or document access",
      "Dependency/runtime risk: command execution surface, external package install surface",
      "Permission surface: shell or command execution, filesystem or document access",
      "Review status: AI review approval is missing"
    ]
  },
  "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": 81,
    "risk_level": "risky",
    "risk_label": "Risky",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
      "AI review approval is missing",
      "This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
      "Quality score needs review",
      "Permission surface needs review: shell or command execution, filesystem or document access",
      "Dependency/runtime risk: command execution surface, external package install surface"
    ]
  },
  "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": 77,
    "label": "Strong"
  },
  "supply": {
    "track": "Coding and developer agents",
    "scenario": "Coding agents",
    "maintenance": "11d 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",
    "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required"
  ],
  "agent_contract": {
    "task_input": "Use golang-samber-do 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: 76/100 Strong shortlist",
      "Audit: 81/100 Risky",
      "Safety: 49/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "samber-golang-samber-do (golang-samber-do)",
      "install_command": "npx skills add samber/cc-skills-golang --skill golang-samber-do",
      "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": "samber-golang-samber-do",
      "task": "Use golang-samber-do 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/samber-golang-samber-do",
    "api": "https://www.openagentskill.com/api/agent/skills/samber-golang-samber-do",
    "audit": "https://www.openagentskill.com/skills/samber-golang-samber-do/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=samber-golang-samber-do&task=Use%20golang-samber-do%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20golang-samber-do%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20golang-samber-do%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/samber-golang-samber-do/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/samber-golang-samber-do"
  }
}

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Creator: samber
Source: samber/cc-skills-golang
Indexed by: OpenAgentSkill community index

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