Designing Backend Error Messages

Quality score: 70/100 · Category: Security · Sub-category: security-misc

type:audittype:review

Designs backend API error contracts with a REST-default approach using RFC 9457 Problem Details, stable machine-readable codes, retry semantics, validation error payloads, observability, and security-safe messaging. Reviews existing error handling against a binary rubric and proposes concrete fixes. Produces optional artifacts such as errors.yaml entries, Problem Details examples, OpenAPI fragments, and runbook templates. Use when creating or revising backend error responses, auditing API error quality, mapping status/code behavior, or documenting error handling for REST, gRPC, GraphQL, and async services.

What this skill does

Designing Backend Error Messages is a production-ready Claude Code skill (quality score 70/100) in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/designing-backend-error-messages/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when creating or revising backend error responses, auditing API error quality, mapping status/code behavior, or documenting error handling for REST, gRPC, GraphQL, and async services.

Who uses this skill

The Designing Backend Error Messages skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/designing-backend-error-messages
curl -L https://claudskills.com/skills/designing-backend-error-messages/SKILL.md \
  -o ~/.claude/skills/designing-backend-error-messages/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/designing-backend-error-messages/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/designing-backend-error-messages/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\designing-backend-error-messages\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

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