Everything downstream starts after a prompt is written, and nothing looks at the sentence you're about to send. That sentence is the cheapest artifact in the workflow and the highest-leverage one: a vague instruction doesn't fail loudly, it produces a plausible wrong thing, and the cost lands three steps later in a review pass and a rebuild.
Promptkit is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/promptkit/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when the user says "optimize this prompt", "improve this prompt", "make this prompt better", "sharpen this instruction", "what's wrong with this prompt", "write a system prompt for my app", "rewrite my system prompt", or "/promptkit".
The Promptkit Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/promptkit curl -L https://claudskills.com/skills/promptkit/SKILL.md \ -o ~/.claude/skills/promptkit/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/promptkit/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/promptkit/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\promptkit\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
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.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/promptkit/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Promptkit is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{promptkit-2026,
author = {mimukit},
title = {Promptkit [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/promptkit/}
}Grade A · scanned 2026-09-28 — free static scan against the OWASP Agentic Skills Top 10.
The scan flagged 1 of 10 categories (prompt-injection), including a high-severity pattern. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.
Browse all General skills in the ClaudSkills registry, or explore these other picks from the same category:
Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel · Telegram @acreatorstore
SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.