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golang-language

Core idioms, style guides, and best practices for writing idiomatic Go code. Use when writing Go code following official style guides and idiomatic patterns.

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  • SKILL.md2.0 KB
  • evals/evals.json1.7 KB
  • references/effective-go-summary.md707 B
  • references/idioms.md750 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

Golang Language Standards

Priority: P0 (CRITICAL)

Guidelines

  • Formatting: Run gofmt or goimports on save. Use gopls for LSP features.
  • Naming: Use camelCase for internal (unexported) and PascalCase for public (exported) symbols.
  • Packages: Use short, lowercase, singular names (e.g., http, user). Avoid _ or camelCase in package names.
  • Interfaces: Small interfaces — 1-2 methods max. Define where used (consumer side), not where implemented.
  • Errors: Return error as last return value. Handle errors immediately at call-site.
  • Slices: Use make(slice, len, cap) to pre-allocate capacity and avoid redundant re-allocations.
  • Enums: Use const block with iota for type-safe enumerations.
  • Zero Values: Leverage zero-value initialization over explicit nil checks where possible.

Anti-Patterns

  • No init: Use constructors (NewService()), not init(). (not init() — it runs implicitly and makes testing harder)
  • No Globals: Use DI, not global mutable state.
  • No panic: Return errors, don't panic.
  • No _ ignored errors: Always check and handle errors.
  • No stutter: log.Error, not log.LogError.

Verification Workflow (Mandatory)

After writing or modifying Go code:

  1. mcp__ide__getDiagnostics — catch compile errors and gopls type diagnostics immediately
  2. go vet ./... — catch common mistakes (printf mismatches, unreachable code, shadowed vars)
  3. goimports -w . — fix imports and formatting in one pass

References

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