Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add ANcpLua/ancplua-claude-plugins/plugin install cc-plugin-evalWrote 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/ancplua/ancplua-claude-plugins/improve-skill)<a href="https://agentmods.dev/skills/ancplua/ancplua-claude-plugins/improve-skill"><img src="https://agentmods.dev/badge/skills/ancplua/ancplua-claude-plugins/improve-skill/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/ancplua/ancplua-claude-plugins/improve-skill"><img src="https://agentmods.dev/badge/skills/ancplua/ancplua-claude-plugins/improve-skill.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 | $0.00061 | $0.00746 |
| Opus 5 | $0.00030 | $0.00373 |
| Sonnet 5 | $0.00012 | $0.00149 |
| Haiku 4.5 | $0.00006 | $0.00075 |
Grade A, and why
improve-skill scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Improve Skill
Use this skill after cc-plugin-eval has already produced findings for a local skill.
The runnable commands below invoke the shipped script through the plugin root, which works in any checkout: node "${CLAUDE_PLUGIN_ROOT}/scripts/cc-plugin-eval.js" <command> <args>. Inline mentions of cc-plugin-eval <command> are shorthand for that same invocation; the bare cc-plugin-eval alias only exists if you ran npm link in the plugin directory.
What This Skill Does NOT Do
This skill does not perform LLM-driven rewrites. That is the job of the skill-creator skill (Anthropic's skill-creator@claude-plugins-official). cc-plugin-eval produces structured findings and a rewrite brief; skill-creator turns the brief into edits with subagent-driven evals and grading. Keep the two boundaries clear.
Workflow
- Run
cc-plugin-eval analyze <skill-path> --brief-out ./skill-brief.json. The same payload is also produced bycc-plugin-eval improve <skill-path> --brief-out ./skill-brief.json, which writes the improvement brief as the top-level payload. - Read the improvement brief. Group work into required fixes (severity
errororfail) versus recommended fixes (severitywarnorinfo). - Hand the brief to
skill-creator. That skill specializes in skill rewrites with subagent-driven evals. - Re-run
cc-plugin-eval analyze <skill-path> --output ./after.jsonand usecc-plugin-eval compare ./before.json ./after.json --format markdownto measure the delta.
Focus Areas
- reduce trigger and invoke token costs (move bulky details into references, scripts, or helper files)
- keep
SKILL.mdcompact (target under 500 lines; hard limit at 800; reference threshold is 350) - improve trigger descriptions so Claude reliably routes to the skill (CC203, CC204)
- fix broken relative links (CC211), oversized descriptions (CC202), and frontmatter issues (CC213)
- normalize
allowed-toolssyntax (CC215) and adddisable-model-invocationto task-style skills where appropriate (CC216)
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.
- 9d ago First seen · 50 lines · 61 tokens per session scan A d8cd647b495a
improve-skill is a skill published in the GitHub repository ANcpLua/ancplua-claude-plugins (6 stars, last pushed 22d ago), licensed MIT. It adds 61 tokens to every session and 746 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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