# Li Lance Android Seraphim Framework Golang Error Handling

> Golang Error Handling Standards

- Skill: `tomevault-io/li-lance-android-seraphim-framework-golang-error-handling` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/li-lance-android-seraphim-framework-golang-error-handling`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/li-lance-android-seraphim-framework-golang-error-handling/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/li-lance-android-seraphim-framework-golang-error-handling

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# Golang Error Handling Standards

## **Priority: P0 (CRITICAL)**

## Principles

- **Errors are Values**: Handle them like any other value.
- **Handle Once**: Log OR Return. Never Log AND Return (creates duplicate logs).
- **Add Context**: Don't just return `err` bubble up. Wrap it with context:
  `fmt.Errorf("failed to open file: %w", err)`.
- **Use Standard Lib**: Go 1.13+ `errors` package (`Is`, `As`, `Unwrap`) is sufficient. Avoid
  `pkg/errors` (deprecated).

## Guidelines

- **Sentinel Errors**: Expoted, fixed errors (`io.EOF`, `sql.ErrNoRows`). Use
  `errors.Is(err, io.EOF)`.
- **Error Types**: Structs implementing `error`. Use `errors.As(err, &target)`.
- **Panic**: Only for unrecoverable startup errors.

## Anti-Patterns

- **No bare return err**: Wrap with `fmt.Errorf("context: %w", err)` to preserve call chain.
- **No string error checks**: Use `errors.Is`/`errors.As`; string comparison is brittle.
- **No swallowed errors**: Never assign errors to `_`; always handle or propagate.

## References

- [Error Wrapping Patterns](references/error-wrapping.md)

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> Source: [li-lance/android-seraphim-framework](https://github.com/li-lance/android-seraphim-framework) — distributed by [TomeVault](https://tomevault.io).
<!-- tomevault:4.0:skill_md:2026-06-16 -->