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Fastify Troubleshooting

Category: Engineering  ·  Sub-category: performance  ·  Last updated:
type:debug
This skill should be used when debugging Fastify issues, identifying Fastify anti-patterns, diagnosing common Fastify mistakes, performing Fastify error troubleshooting, investigating request.body undefined in hook, fixing decorator shared across requests, resolving hook executing twice, handling reply already sent error, debugging encapsulation not working, fixing schema validation bypassed, diagnosing serialization error 500, handling Fastify crash unhandled rejection, troubleshooting plugin not loading, resolving decorator not found, or diagnosing Fastify performance problems.

From the source SKILL.md

You are diagnosing and fixing Fastify issues. Follow these rules strictly. Every section is organized by category with NEVER rules (things you must prevent) and BUG patterns (common mistakes to detect and fix).

What this skill does

Fastify Troubleshooting is a community-contributed Claude Code skill in the performance sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/fastify-troubleshooting/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Fastify Troubleshooting Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/fastify-troubleshooting
curl -L https://claudskills.com/skills/fastify-troubleshooting/SKILL.md \
  -o ~/.claude/skills/fastify-troubleshooting/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/fastify-troubleshooting/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/fastify-troubleshooting/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\fastify-troubleshooting\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.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Attribution & license

More Engineering skills

Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Engineering skills → Top 100 skills
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

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