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 anymouschina/TapCanvas --skill skill-creatorgit clone --depth 1 https://github.com/anymouschina/TapCanvasWrote 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/anymouschina/tapcanvas/skill-creator)<a href="https://agentmods.dev/skills/anymouschina/tapcanvas/skill-creator"><img src="https://agentmods.dev/badge/skills/anymouschina/tapcanvas/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 5.1 | $0.00064 | $0.08084 |
| Opus 5 | $0.00032 | $0.04042 |
| Sonnet 5 | $0.00013 | $0.01617 |
| Haiku 4.5 | $0.00006 | $0.00808 |
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 8d 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.
This is a copy
83% identical to skill-creator — 125 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 564 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Creator
A skill for creating new skills and iteratively improving them.
Your job is not just to produce a valid SKILL.md. Produce a skill that triggers reliably, resists misuse, has clear boundaries, and stays coherent across many prompts. Treat "technically works" as the floor.
What High-Quality Skills Actually Have
Weak skills usually look polished but miss one of these layers:
- Role
- Outcome
- Workflow
- Decision rules
- Boundaries
- Quality bar
- Resource strategy
If one is missing, the skill is probably underspecified.
Use Exemplars Properly
When the user gives you a strong skill as reference, reverse-engineer it. Extract what it optimizes for, what it treats as non-negotiable, how it separates core instructions from references, where it draws boundaries, how it names failure modes, and whether it includes a review loop.
Transfer the pattern, not the prose. Useful pattern names include:
- "identity + workflow + anti-patterns + quality gate"
- "domain worldview first, execution steps second"
- "teach the taste, not just the format"
- "bundle the nuance into references, keep the operating loop in
SKILL.md"
If you need a concrete comparison rubric for strong versus weak skills, read references/quality_bar.md.
At a high level, the process of creating a skill goes like this:
- Decide what you want the skill to do and roughly how it should do it
- Write a draft of the skill
- Create a few test prompts and run claude-with-access-to-the-skill on them
- Help the user evaluate the results both qualitatively and quantitatively
- While the runs happen in the background, draft some quantitative evals if there aren't any (if there are some, you can either use as is or modify if you feel something needs to change about them). Then explain them to the user (or if they already existed, explain the ones that already exist)
- Use the
eval-viewer/generate_review.pyscript to show the user the results for them to look at, and also let them look at the quantitative metrics
- Rewrite the skill based on feedback from the user's evaluation of the results (and also if there are any glaring flaws that become apparent from the quantitative benchmarks)
- Repeat until you're satisfied
- Expand the test set and try again at larger scale
What ships with it
19 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.
- agents/analyzer.md 10 KB
- agents/comparator.md 7.1 KB
- agents/grader.md 8.8 KB
- assets/eval_review.html 6.9 KB
- eval-viewer/generate_review.py 16 KB runs code
- eval-viewer/viewer.html 44 KB
- LICENSE.txt 11 KB
- references/authoring_guide.md 4.2 KB
- references/quality_bar.md 4.2 KB
- references/schemas.md 12 KB
- scripts/__init__.py 0 B runs code
- scripts/aggregate_benchmark.py 14 KB runs code
- scripts/generate_report.py 13 KB runs code
- scripts/improve_description.py 11 KB runs code
- scripts/package_skill.py 4.1 KB runs code
- scripts/quick_validate.py 3.9 KB runs code
- scripts/run_eval.py 11 KB runs code
- scripts/run_loop.py 13 KB runs code
- scripts/utils.py 1.6 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.
- 8d ago First seen · 564 lines · 64 tokens per session scan A 5d7761f90dbd
skill-creator is a skill published in the GitHub repository anymouschina/TapCanvas (600 stars, last pushed 2d ago), licensed MIT. It adds 64 tokens to every session and 8,084 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 83% identical to skill-creator, differing in 125 lines, and is treated as a copy.
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