Borrowing it
Nothing to install: this file belongs to Nnnsightnnn/claudekit. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Nnnsightnnn/claudekit/main/.claude/skills/skill-improver/SKILL.mdgit clone --depth 1 https://github.com/Nnnsightnnn/claudekitWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/nnnsightnnn/claudekit/skill-improver)<a href="https://agentmods.dev/skills/nnnsightnnn/claudekit/skill-improver"><img src="https://agentmods.dev/badge/skills/nnnsightnnn/claudekit/skill-improver/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/nnnsightnnn/claudekit/skill-improver"><img src="https://agentmods.dev/badge/skills/nnnsightnnn/claudekit/skill-improver.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00033 | $0.05152 |
| Opus 5.5 | $0.00013 | $0.02061 |
| Sonnet 5.5 | $0.00007 | $0.01030 |
| Haiku 4.5 | $0.00003 | $0.00515 |
Grade B, and why
Skill Improver scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
grep "skill-name" .claude/pain-points/ai-error-history.json The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 755 lines · 33 tokens per session scan B 3cf2a1b1aab8
Skill Improver is a skill published in the GitHub repository Nnnsightnnn/claudekit (2 stars, last pushed 4mo ago), with no licence file. It adds 33 tokens to every session and 5,152 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other skills, from other repositories
repo-reading
How Brownspec reads an existing codebase — the project map, the conventions sample, and the blast radius. Use when another Brownspec skill needs repository facts, or when the user asks what a change touches, who calls a symbol, or what this project's conventions are.
source-command-methodology-advisor
Analyzes your codebase and asks 3 targeted questions to recommend the right AI-assisted development methodology stack.
methodology-advisor
Analyzes your codebase and asks 3 targeted questions to recommend the right AI-assisted development methodology stack.
release-notes
Generate release notes in multiple formats from git commits.
talk-stage5-script
Produces a complete 5-act pitch with speaker notes, a slide-by-slide specification, and a ready-to-paste Kimi prompt for AI slide generation. Requires validated angle and title from Stage 4. Use when you have a confirmed talk angle and need the full script, slide spec, and AI-generated presentation prompt.
best-of-n
Generate bounded independent candidates, score them against a frozen rubric, and verify the selected result with a proof log.