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golang-configuration

Load and validate application configuration from environment variables and config files. Use when managing Go application config with environment variables or viper.

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  • SKILL.md1.8 KB
  • evals/evals.json1.8 KB
  • references/config-patterns.md1.3 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Golang Configuration

Priority: P1 (HIGH)

Principles

  • 12-Factor App: Store config in environment variables.
  • Typed Config: Load config into struct, validate immediately.
  • Secrets: Never commit secrets. Use env vars or secret managers.
  • No Globals: Return Config struct and inject it.

Implementation Workflow

  1. Define Config struct — Create typed struct with all required fields.
  2. Load defaults — Set sensible defaults for non-secret values.
  3. Override from file — Optionally load from YAML/JSON config file.
  4. Override from env — Environment variables take highest priority.
  5. Validate at startup — Crash immediately on missing required config.
  6. Inject via constructor — Pass Config to services; never use global config vars.

See config struct and usage examples

Libraries

  • Standard Lib: os.Getenv for simple apps.
  • Viper: Industry standard for complex configs (env, files, remote).
  • Koanf: Lighter, cleaner alternative to Viper.
  • Caarlos0/env: Strict struct tagging approach.

Anti-Patterns

  • No hardcoded secrets: load all secrets from env vars or secret manager.
  • No global config vars: return typed Config struct and inject via constructors.
  • No silent startup: crash immediately on missing required env vars.

References

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