Is the Backend Development skill free?

Yes. The skill itself is free from mrgoonie/claudekit-skills. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Backend Development SkillProof Score?

8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 4/5.

How do I install Backend Development?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Backend Development with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Backend Development

Reference-backed backend guidance: APIs, auth, DB, security, DevOps — self-contained, no CLI.

by mrgoonie · mrgoonie/claudekit-skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 8.8/10
Tested: Jul 20, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 860321e

Fetched the repo tree and the raw SKILL.md plus reference files; all 11 files the body links (backend-security.md, backend-api-design.md, etc.) exist and contain concrete, correct guidance (e.g. Argon2id, parameterized-query examples, helmet headers). Grepped every reference for exfiltration/hidden-instruction/base64/secret payloads — only hit was a legit pprof localhost URL. Frontmatter parses with name+description; no hardcoded machine paths. Unsourced stat claims ("98% SQL injection reduction", "83% migrations fail") cost a docs point.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 8/10
Docs & honesty 4/5

What Backend Development does

A pure-prompt reference skill that steers backend work toward 2025 best practices — Argon2id, parameterized queries, OAuth 2.1/JWT, caching, testing pyramid, and deployment patterns — with 11 detailed reference files. It triggers when you design APIs, build auth, optimize databases, or set up CI/CD for production backends.

How to install Backend Development

Copy the `.claude/skills/backend-development/` directory (SKILL.md + references/) into your project's or user's `.claude/skills/`. No external tools required — it is pure prompt guidance.

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Backend Development

/backend-development Reference-backed backend guidance: APIs, auth, DB, security, DevOps — self-contained, no CLI.

It also activates on plain-language prompts like these:

Design a REST API with JWT authentication
Optimize this PostgreSQL query for performance
Set up a CI/CD pipeline with Docker for this service

Frequently asked questions

Is the Backend Development skill free?: Yes. The skill itself is free from mrgoonie/claudekit-skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does Backend Development work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 20, 2026. Verdict: Tested · Works. Fetched the repo tree and the raw SKILL.md plus reference files; all 11 files the body links (backend-security.md, backend-api-design.md, etc.) exist and contain concrete, correct guidance (e.g. Argon2id, parameterized-query examples, helmet headers). Grepped every reference for exfiltration/hidden-instruction/base64/secret payloads — only hit was a legit pprof localhost URL. Frontmatter parses with name+description; no hardcoded machine paths. Unsourced stat claims ("98% SQL injection reduction", "83% migrations fail") cost a docs point.
What is the Backend Development SkillProof Score?: 8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 4/5.
How do I install Backend Development?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Backend Development with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.