Borrowing it
Nothing to install: this file belongs to openclosed-org/axum-harness. 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/openclosed-org/axum-harness/main/.agents/skills/skill-authoring/SKILL.mdgit clone --depth 1 https://github.com/openclosed-org/axum-harnessWrote 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/openclosed-org/axum-harness/skill-authoring)<a href="https://agentmods.dev/skills/openclosed-org/axum-harness/skill-authoring"><img src="https://agentmods.dev/badge/skills/openclosed-org/axum-harness/skill-authoring/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/openclosed-org/axum-harness/skill-authoring"><img src="https://agentmods.dev/badge/skills/openclosed-org/axum-harness/skill-authoring.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 | $0.00044 | $0.00242 |
| Opus 5 | $0.00022 | $0.00121 |
| Sonnet 5 | $0.00009 | $0.00048 |
| Haiku 4.5 | $0.00004 | $0.00024 |
Grade A, and why
skill-authoring 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.
What it actually says
Skill Authoring
Use this skill for repository skill changes.
Read agent/skill-authoring.md before editing skills.
Rules
- Decide whether the skill is an ownership skill or workflow skill.
- Keep
SKILL.mdfocused and short. - Make the description a trigger interface with
Use whenlanguage. - Put detailed reference material in adjacent files.
- Do not duplicate
AGENTS.md,north-star.md, or accepted ADRs. - Do not write target-state claims as current behavior.
- Ensure workflow skills defer to ownership boundaries.
Review Checklist
- The skill has one clear reason to exist.
- The trigger description is specific.
- Writable and forbidden paths are clear when relevant.
- Evidence terms are precise.
- References are one level deep where possible.
- No generated or target-state path is treated as current executable behavior.
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 · 33 lines · 44 tokens per session scan A 01a12c5154b7
skill-authoring is a skill published in the GitHub repository openclosed-org/axum-harness (49 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 44 tokens to every session and 242 once invoked, about $0.0002 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 2026-08-30.
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