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/krishagel/geoffrey/skill-creatornpx skills add krishagel/geoffrey --skill skill-creatorgit clone --depth 1 https://github.com/krishagel/geoffreyWrote 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/krishagel/geoffrey/skill-creator)<a href="https://agentmods.dev/skills/krishagel/geoffrey/skill-creator"><img src="https://agentmods.dev/badge/skills/krishagel/geoffrey/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 | $0.00094 | $0.03990 |
| Opus 5 | $0.00047 | $0.01995 |
| Sonnet 5 | $0.00019 | $0.00798 |
| Haiku 4.5 | $0.00009 | $0.00399 |
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 5d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- skill-creator — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 399 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.
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. Then explain them to the user
- Use the
eval-viewer/generate_review.pyscript to show the user the results, and also let them look at the quantitative metrics
- Rewrite the skill based on feedback from the user's evaluation
- Repeat until satisfied
- Expand the test set and try again at larger scale
Your job is to figure out where the user is in this process and help them progress. Maybe they want to make a skill from scratch, or maybe they already have a draft and want to iterate.
Be flexible -- if the user says "I don't need to run a bunch of evaluations, just vibe with me", do that instead.
After the skill is done (order is flexible), run the skill description improver to optimize triggering.
Communicating with the user
Pay attention to context cues to understand how to phrase communication. In the default case:
- "evaluation" and "benchmark" are borderline, but OK
- for "JSON" and "assertion" you want to see cues from the user that they know what those things are before using them without explaining
It's OK to briefly explain terms if you're in doubt.
Creating a skill
Capture Intent
Start by understanding the user's intent. The current conversation might already contain a workflow the user wants to capture (e.g., they say "turn this into a skill"). If so, extract answers from the conversation history first -- the tools used, the sequence of steps, corrections the user made, input/output formats observed. The user may need to fill gaps, and should confirm before proceeding.
What ships with it
20 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/output-patterns.md 1.8 KB
- references/schemas.md 12 KB
- references/workflows.md 818 B
- 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 10 KB runs code
- scripts/init_skill.py 13 KB runs code
- scripts/package_skill.py 4.1 KB runs code
- scripts/quick_validate.py 3.8 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.
- 5d ago First seen · 399 lines · 94 tokens per session scan A 8eb509702615
skill-creator is a skill published in the GitHub repository krishagel/geoffrey (5 stars, last pushed 5mo ago), licensed MIT. It adds 94 tokens to every session and 3,990 once invoked, about $0.0005 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 2026-08-31.
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