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Using uber-go/dig for Dependency Injection in Go · samber | DecimalAI

codingby samber

Using uber-go/dig for Dependency Injection in Go

samber/golang-uber-dig

Source samber/cc-skills-golang ↗License MIT

Implements dependency injection in Golang using uber-go/dig — reflection-based container, Provide/Invoke, dig.In/dig.Out parameter and result objects, named values, value groups, optional dependencies, scopes, and Decorate. Apply when using or adopting uber-go/dig, when the codebase imports `go.uber.org/dig`, or when wiring an application graph at startup. For higher-level lifecycle and modules, see `samber/cc-skills-golang@golang-uber-fx` skill.

SkillScore100Maintained

Automatic

Coding pack

Last verified 9/9/2026

What it changes

Passed 22 of 22 test cases with the skill, and 18 of 22 without it.

Without skill82%

With skill100%

Checks it passed that the model alone missed

Notes that dig lacks built-in lifecycle hooks.
Passes `dig.DeferAcyclicVerification()` to dig.New.
Notes that dig wraps constructor errors with dependency paths.

and 1 more in the full report

4 fixed18 passed either way0 still failing0 broke

Pass-rate lift: +18 pp
Tokens: +113%
Agent turns: 0%
Response time: -11%

Model gemini-3.6-flashMeasured 9/9/2026v222 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/samber-golang-uber-dig/SKILL.md https://app.decimal.ai/s/samber-golang-uber-dig/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add samber-golang-uber-dig, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/samber-golang-uber-dig/ and pins it in .decimal/skills.lock

decimalai skills add samber-golang-uber-dig

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/samber-golang-uber-dig/SKILL.md https://app.decimal.ai/s/samber-golang-uber-dig/SKILL.md

Raw file: /s/samber-golang-uber-dig/SKILL.md ↗ · machine-readable summary at /s/samber-golang-uber-dig.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 4

Prompt

For a large container graph in Uber dig where startup latency is critical, what container option defers graph acyclicity verification until invocation?

What was checked, without and with the skill
Checked	Without skill	With skill
Passes `dig.DeferAcyclicVerification()` to dig.New.	Missed	Passed

case-13 · gemini-3.6-flash · 9/9/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md209 lines4 files

Persona: You are a Go architect wiring an application graph with dig. You keep the container at the composition root, depend on interfaces not concrete types, and treat constructor errors as first-class failures.

Using uber-go/dig for Dependency Injection in Go

Reflection-based DI toolkit, designed to power application frameworks (it is the engine behind uber-go/fx) and resolve object graphs during startup.

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.

go get go.uber.org/dig

dig vs. fx

fx is built on dig and shares the same container engine — the DI primitives (Provide, Invoke, In/Out structs, named values, value groups) are identical. fx.In/fx.Out are re-exports of dig.In/dig.Out.

What fx adds on top of dig:

Concern	dig	fx
DI container	✅ `dig.New()`	✅ (embedded)
Lifecycle hooks	❌	✅ `fx.Lifecycle` OnStart/OnStop
Module system	❌	✅ `fx.Module` with scoped decorators
Signal-aware run loop	❌	✅ `app.Run()` blocks on SIGINT/SIGTERM
Structured event logging	❌	✅ `fx.WithLogger` / `fxevent`
Startup/shutdown timeout	❌	✅ `fx.StartTimeout` / `fx.StopTimeout`

Choose dig when you need the wiring graph only: CLI tools, libraries exposing a container to callers, test harnesses, or embedding DI into an existing app that manages its own lifecycle.

Choose fx for long-running services (HTTP servers, workers, daemons) — lifecycle and signal handling are non-negotiable there. See samber/cc-skills-golang@golang-uber-fx skill.

Track record

Benchmark

22 / 22

test cases passed, vs 18 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 9/8/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

samber / cc-skills-golang

skills/golang-uber-dig/SKILL.md

View on GitHub ↗

License MITImported 9/8/2026Version v2Bundled 3 files

More skills from the same source and nearby in the registry, with their headline benchmark lift.

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See it in action

What's inside

Using uber-go/dig for Dependency Injection in Go

dig vs. fx

Track record

Benchmark

Adoption

SkillSafety

Source

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