Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add larsboes/Axon --skill skill-creatorgit clone --depth 1 https://github.com/larsboes/AxonWrote 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/larsboes/axon/skill-creator)<a href="https://agentmods.dev/skills/larsboes/axon/skill-creator"><img src="https://agentmods.dev/badge/skills/larsboes/axon/skill-creator/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/larsboes/axon/skill-creator"><img src="https://agentmods.dev/badge/skills/larsboes/axon/skill-creator.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 | $0.00129 | $0.02650 |
| Opus 5.5 | $0.00052 | $0.01060 |
| Sonnet 5.5 | $0.00026 | $0.00530 |
| Haiku 4.5 | $0.00013 | $0.00265 |
Grade A, and why
skill-creator 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 — 151 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Creator
Build a skill a zero-context executor — a mid-level engineer, or the weakest model that will deploy it — can load and run correctly on the first try. Discoverable metadata, lean body, deterministic scripts, evals that prove the skill earns its context cost. Ground truth only: verify every path and command against disk before writing it down.
Before you scaffold
Write a skill when the same instructions get pasted into chat repeatedly, or a CLAUDE.md
section has grown into a procedure rather than a fact — a skill's body loads only when
triggered, so it costs nothing until used. Don't write one for a single unrepeated task, or
for a fact with no procedure attached (that's a references/ note in an existing skill, or
CLAUDE.md itself). Then place it: an existing pack whose domain fits > a new skill in a new
pack > a loose personal skill. Splitting vs merging skills inside a pack:
references/patterns.md §Pack routing.
Variables — instantiate before writing
| var | fill with | constraint |
|---|---|---|
<name> |
the skill id | ^[a-z0-9]+(-[a-z0-9]+)*$, ≤64, == directory basename, no anthropic/claude |
<desc> |
the trigger sentence | 3rd person, ≤1024, what + "Use when …" + "Do not use for …", triggers only — never a workflow summary |
<when_to_use> |
optional extra triggers | combined with <desc> ≤1536 chars, key use case first |
<dir> |
Packs/<pack>/skills/<name> (pack) · .claude/skills/<name> (project) · ~/.claude/skills/<name> (personal) |
pack skills deploy via adapters |
<freedom> |
low | medium | high per step |
fragile/safety → low · preferred-pattern → medium · open-ended → high |
<body_max> |
500 |
hard line ceiling for SKILL.md |
<ref_depth> |
1 |
references stay this many hops from SKILL.md |
<folders> |
scripts references assets evals |
the subdirs YOU create, each one level deep |
A deployed skill may also arrive with nothing you did not put there. A skill must be able to
run from its own directory — no shared data directory, no paths into a sibling skill's tree.
The distinction that matters, and the one a pack-level shared/ mechanism was tried and removed
for violating:
What ships with it
15 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.
- assets/SKILL.template.md 1.8 KB
- evals/evals.json 4.8 KB
- evals/files/bad-skill/references/details.md 105 B
- evals/files/bad-skill/references/more/deep.md 146 B
- evals/files/bad-skill/SKILL.md 539 B
- references/architecture.md 2.5 KB
- references/best-practices.md 5.8 KB
- references/bootstrap-library.md 4.7 KB
- references/checklist.md 3.0 KB
- references/claude-code-extensions.md 6.4 KB
- references/evaluation.md 7.6 KB
- references/fable-5-authoring.md 4.0 KB
- references/patterns.md 4.5 KB
- references/question-gates.md 4.1 KB
- scripts/validate_metadata.py 6.1 KB runs code
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 · 151 lines · 129 tokens per session scan A bb2a9028e770
skill-creator is a skill published in the GitHub repository larsboes/Axon (1 stars, last pushed 1mo ago), licensed MIT. It adds 129 tokens to every session and 2,650 once invoked, about $0.0005 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 2026-09-23.
skill-creator compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| skill-creatorlarsboes/Axon | Skill | 1 | 1mo ago | MIT | A | 129 | Claude Code |
| ligandmpnnaipoch/open-science | Skill | 5.5k | today | Apache-2.0 | A | 100 | Claude Code, Codex |
| evo2aipoch/open-science | Skill | 5.5k | today | Apache-2.0 | A | 83 | Claude Code, Codex |
| create-agentPM-Shawn/Abu-Cowork | Skill | 419 | 3d ago | Apache-2.0 | A | 13 | Claude Code |
| content-monitorCoWork-OS/CoWork-OS | Skill | 537 | today | MIT | A | 16 | Claude Code, Codex |
| llm-wikiCoWork-OS/CoWork-OS | Skill | 537 | today | MIT | A | 27 | Claude Code, Codex |
| simplifyCoWork-OS/CoWork-OS | Skill | 537 | today | MIT | A | 24 | Claude Code, Codex |