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 agentmods add skills/xuiltul/animaworks/skill-creatornpx skills add xuiltul/animaworks --skill skill-creatorgit clone --depth 1 https://github.com/xuiltul/animaworksWrote 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/xuiltul/animaworks/skill-creator)<a href="https://agentmods.dev/skills/xuiltul/animaworks/skill-creator"><img src="https://agentmods.dev/badge/skills/xuiltul/animaworks/skill-creator.svg" alt="Measured on agentmods" 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 | $0.00046 | $0.01368 |
| Opus 5 | $0.00023 | $0.00684 |
| Sonnet 5 | $0.00009 | $0.00274 |
| Haiku 4.5 | $0.00005 | $0.00137 |
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 4d 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
Skill file structure
A Skill file consists of YAML frontmatter and Markdown body.
Required frontmatter fields are name and description.
Optional metadata may include tool constraints, trust/provenance fields, category, prompt policy, and routing hints. Use optional fields only when they help selection, safety, or maintenance.
---
name: skill-name
description: >-
Concise third-person summary of what the skill does.
Use when: comma-separated scenarios where this skill applies.
allowed_tools:
- read_memory_file
trust_level: trusted
source:
type: anima
origin: manual
category: communication
use_when:
- drafting partner emails
trigger_phrases:
- draft a partner email
negative_phrases:
- personal diary
domains:
- gmail
routing_examples:
- Prepare a reply draft for the bank thread
---
description is the primary field for discovery and selection: the model uses it to decide relevance.
The body is read when you open the path from the system prompt skill catalog with read_memory_file (e.g. skills/foo/SKILL.md, common_skills/bar/SKILL.md).
Supported create_skill optional arguments include references, templates, allowed_tools, trust_level, source_type, source_origin, category, promotion_status, skill_policy, use_when, trigger_phrases, negative_phrases, domains, and routing_examples.
Authoring format: follow Use when: as described in references/description_guide.md (Agent Skills standard).
After editing, validate with python scripts/lint_skill.py path/to/SKILL.md.
Writing description
Do not use legacy 「」 keyword lists. Use a short third-person capability line plus Use when: with concrete verbs and nouns.
See references/description_guide.md for rules (250 characters, no XML tags, examples, checklist).
Domain-specific and concrete
Generic wording causes false positives. Prefer tool names, operations, and targets specific to the skill.
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.
- 4d ago First seen · 151 lines · 46 tokens per session scan A 5be3d5cdb9da
skill-creator is a skill published in the GitHub repository xuiltul/animaworks (254 stars, last pushed 4d ago), licensed Apache-2.0. It adds 46 tokens to every session and 1,368 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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