Borrowing it
Nothing to install: this file belongs to ribeirogab/zeno-agent. 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/ribeirogab/zeno-agent/main/.agents/skills/skill-improver/SKILL.mdgit clone --depth 1 https://github.com/ribeirogab/zeno-agentWrote 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/ribeirogab/zeno-agent/skill-improver)<a href="https://agentmods.dev/skills/ribeirogab/zeno-agent/skill-improver"><img src="https://agentmods.dev/badge/skills/ribeirogab/zeno-agent/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/ribeirogab/zeno-agent/skill-improver"><img src="https://agentmods.dev/badge/skills/ribeirogab/zeno-agent/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 | $0.00156 | $0.02045 |
| Opus 5.5 | $0.00062 | $0.00818 |
| Sonnet 5.5 | $0.00031 | $0.00409 |
| Haiku 4.5 | $0.00016 | $0.00204 |
Grade A, and why
skill-improver 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 1mo 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 — 157 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Improver
Refactor existing skills following Anthropic's best-practices guidance (sourced from skill-creator) without changing what the skill does. Trigger phrases, output formats, hard-gates, and phase ordering are invariants — captured before any change and verified after.
When to use
The user asks to:
- "refactor", "audit", "improve", "atualizar", "auditar", "melhorar", "aplicar boas práticas" + reference to a skill (path or name)
- "this skill is too long" / "this skill has too many sections" / "split this skill"
- "apply Anthropic best-practices to skill X"
The user is NOT asking to:
- Create a new skill from scratch → use
skill-creator. - Change a skill's behavior, trigger, or output format → that's a content change, not a refactor. Push back: "this isn't a refactor — what should the skill DO differently?"
Workflow
Step 1 — Identify the target
Get the absolute path to the skill's SKILL.md. Examples:
agent/skills/zeno-development/SKILL.md(zeno_default source — image-baked)profiles/<example>/skills/code-review/SKILL.md(profile source)/workspace/skills/<name>/SKILL.md(dashboard source — uploaded zip).claude/skills/<name>/SKILL.md(project-local Claude Code skill)
If the skill already has a references/ directory, list it. Note any scripts/ or assets/.
Step 2 — Snapshot the current state
Copy the entire skill directory tree to tmp/skill-snapshots/<name>-pre/. This is the diff anchor. Use plain cp -r:
mkdir -p tmp/skill-snapshots/<name>-pre/
cp -r <skill-dir>/* tmp/skill-snapshots/<name>-pre/
Step 3 — Capture invariants
Write tmp/skill-snapshots/<name>-pre/invariants.yaml per the schema in references/invariants-preservation.md. The five required keys: description, trigger_phrases, output_templates, hard_gates, phase_ordering.
This file is the contract the post-refactor must honor. Skip nothing — better to over-capture than miss an invariant.
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 157 lines · 156 tokens per session scan A 2bfe8e4285f3
skill-improver is a skill published in the GitHub repository ribeirogab/zeno-agent (10 stars, last pushed 5mo ago), licensed MIT. It adds 156 tokens to every session and 2,045 once invoked, about $0.0006 per session on Opus 5.5. 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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