skills.rest
armanzeroeight
armanzeroeightCOMMUNITY
Explore all skills by this author →
WebsiteGitHub

error-handling

Implement idiomatic Go error handling with wrapping, sentinel errors, and custom types.

29|7|Updated Oct 13, 2025
Search Tags:#debugging#error handling#golang#go#programming#robustness
One-click install
npx skills add https://github.com/armanzeroeight/fastagent-plugins --skill error-handling-armanzeroeight
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: error-handling
Source: https://github.com/armanzeroeight/fastagent-plugins/tree/main/plugins/go-toolkit/skills/error-handling
Command: npx skills add https://github.com/armanzeroeight/fastagent-plugins --skill error-handling-armanzeroeight

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers implement robust and idiomatic Go error handling, preventing common pitfalls and improving application stability.

Core Features & Use Cases

  • Error Wrapping: Add context to errors as they propagate up the call stack using fmt.Errorf with %w.
  • Sentinel Errors: Define and check for specific error conditions using exported error variables and errors.Is.
  • Custom Error Types: Create detailed error types with additional fields for richer error information and use errors.As to extract them.
  • Panic/Recover: Understand when and how to use panic for unrecoverable errors and recover to gracefully handle them.
  • Use Case: When a function encounters an error, wrap it with context like "failed to process user data: %w", allowing downstream functions to add more context like "database operation failed: %w", while still being able to check for the original underlying error.

Quick Start

Use the error-handling skill to implement Go error wrapping with context for the function processData.

Frequently Asked Questions about error-handling

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
What is the best way to wrap Go errors with additional context?▼

Sentinel errors in Go are exported error variables checked using errors.Is to match specific error conditions, while custom error types are richer structs extracted using errors.As to access detailed structured error data fields.

How do I extract structured data from a custom error type in Go?▼

You extract structured data from a custom error type in Go by defining detailed error types with additional fields, then using the errors.As function to unwrap and cast the error to your custom type for accessing its specific information.

When should I use panic and recover mechanisms in Go applications?▼

Use panic and recover mechanisms in Go for unrecoverable errors, where panic stops the program flow and recover gracefully handles them, differing from standard error propagation which expects functions to return and check error values.

Does this Go error management approach support checking for specific underlying error conditions?▼

Yes, this approach supports checking specific underlying error conditions by wrapping errors with fmt.Errorf and using errors.Is to evaluate if an error matches a target sentinel error anywhere within the wrapped error chain.

Why does my Go error wrapping lose the original underlying error?▼

Go error wrapping loses the original underlying error if you use fmt.Errorf with %v instead of %w, which breaks the error chain and prevents errors.Is and errors.As from identifying or extracting the root cause error.

Related Skills

Explore More Software Engineering Skills→
phant-appphant-app

go-error-handling

Analyze and implement Go error handling patterns with wrapping and sentinel errors.

Official
Advanced
JansenAnalyticsJansenAnalytics
5

error-monitor

Monitor application logs and stderr to detect errors, crashes, and exceptions.

Community
Intermediate
charly3pinscharly3pins
4

root-cause-tracing

Trace errors backward through call stacks to identify original triggers.

Community
Basic
kynoptickynoptic
1

Debugging Runtime Errors

Analyze stack traces and error logs to identify root causes and propose fixes.

Community
Advanced