Backend code is where bugs hide longest and blast radius is largest. A shipped bug in a component ruins a pixel; a shipped bug in a payments handler ruins a weekend. The skills below are the ones that most directly shorten the loop between "something's wrong" and "I understand and fixed it," plus a couple that prevent the bug from shipping in the first place. All live in verified plugins with real commit history.

The highest-leverage debugging skill in the ecosystem. From the flagship superpowers plugin (162,164 stars). Forces a disciplined hypothesis-and-test loop: state the hypothesis, design the experiment, observe, update. It replaces the random log-statement shotgun with actual science.

When to use: any bug that's lasted more than 15 minutes. Especially valuable for intermittent production issues where re-running blindly just wastes time.

A hard gate against claiming work is done before it actually passes. Runs verification commands (tests, linters, build) and refuses to declare success without evidence. Saves the embarrassment of "it works on my machine" PRs and the silent regressions that come with them.

When to use: before every commit, every PR description, every "it's fixed" message in Slack.

Build, debug, and optimize Claude API / Anthropic SDK apps. Part of the flagship skills plugin (121,347 stars). Handles prompt caching, migrating between Claude model versions, tool-use patterns, batch API, memory, citations, and thinking. The reference skill when your backend talks to Claude at any nontrivial scale.

When to use: any service integrating the Anthropic SDK. Especially crucial for getting prompt caching right — done wrong, you'll pay full token price on every request and wonder why the bill is so high.

Safety guardrails for destructive commands. Warns before rm -rf, DROP TABLE, force pushes, and other operations that don't have an "undo" button. From the gstack plugin (78,986 stars). Cheap insurance against the command you'll only run wrong once in your career — but that once ends the career.

When to use: always on, especially during incident response when tired hands type things they shouldn't.

Enforces the red-green-refactor cycle when implementing features or fixing bugs. Writes the failing test first, watches it fail, implements, watches it pass. Not dogma — just the reminder that tests written after the fact are verification theater, not a safety net.

When to use: when adding a new endpoint, a new business rule, or reproducing a production bug before fixing it.

Performance regression detection. Establishes baselines, runs benchmarks on demand, and surfaces when a change made something measurably slower. Most teams don't catch perf regressions until the pager goes off; this turns it into a PR-time signal.

When to use: after ORM queries change, after serialization changes, after any hot-path refactor. And periodically even when nothing "changed" — dependencies shift underneath you.

The overlooked half of code review. Forces a pause before implementing reviewer feedback: verify the claim, understand the "why," push back when the suggestion is technically wrong, implement when it's right. Protects against the twin failure modes of performative agreement and blind obedience.

When to use: every time a reviewer leaves a comment. Especially when the suggestion looks plausible but something feels off.

How to install

Each skill lives inside a plugin. Add the plugin marketplace once, then install with a single command. The skill detail page has the exact install string.

If you're new to Claude Code plugins and do backend work, start with superpowers. Four of the seven skills on this list live in it, and installing it changes the baseline quality of every engineering conversation with Claude — more verified evidence, fewer premature "done" claims, fewer random debugging detours.