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 HezaoHezao/poirot --skill skill-creatorgit clone --depth 1 https://github.com/HezaoHezao/poirotWrote 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/hezaohezao/poirot/skill-creator)<a href="https://agentmods.dev/skills/hezaohezao/poirot/skill-creator"><img src="https://agentmods.dev/badge/skills/hezaohezao/poirot/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/hezaohezao/poirot/skill-creator"><img src="https://agentmods.dev/badge/skills/hezaohezao/poirot/skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00015 | $0.00834 |
| Opus 5 | $0.00008 | $0.00417 |
| Sonnet 5 | $0.00003 | $0.00167 |
| Haiku 4.5 | $0.00002 | $0.00083 |
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 10d 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 — 97 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 (a
SKILL.mdwith YAML frontmatter + Markdown body) - Create a few test prompts and run them with the skill injected
- Help the user evaluate the results both qualitatively and quantitatively
- Rewrite the skill based on feedback from the user's evaluation
- Repeat until you're satisfied
- Expand the test set and try again at larger scale
Your job when using this skill is to figure out where the user is in this process and then jump in and help them progress through these stages.
Poirot skill format
A Poirot skill lives in a directory containing SKILL.md:
skills/<category>/<skill-name>/SKILL.md # user skills
poirot/backend/agents/skill/builtin_skills/<category>/<skill-name>/SKILL.md # builtin
Frontmatter fields:
---
name: <skill-name> # unique, lowercase-hyphenated
description: <≤60 char one sentence ending with a period>
allowed-tools: # Poirot tools this skill may invoke
- web_search
- browse_page
- bash
- read_file
- write_file
- list_dir
- str_replace
- present_files
- read_snapshot
enabled: true
related-skills: [<other-skill-name>] # optional cross-references
license: MIT # recommended for contributed skills
author: <human contributor or source attribution>
---
Body: # <Skill> title, 2-3 sentence intro, ## When to Use,
## How to Run, ## Procedure, ## Pitfalls, ## Verification.
Authoring standards
description≤ 60 characters, one sentence, ends with a period. State the capability, not the implementation. No marketing words.- Tools referenced in prose must be native Poirot tools (listed above) or
MCP servers the skill explicitly expects. Do NOT name shell utilities the
agent already has wrapped —
grep→bash,cat/head/tail→read_file,sed/awk→str_replace,find/ls→list_dir. - Scripts go in
scripts/, references inreferences/, templates intemplates/inside the skill directory. Don't expect the model to inline-write non-trivial logic every call — ship a helper script. - Keep the body focused: ~100 lines for a simple skill, ~200 for complex.
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.
- 10d ago First seen · 97 lines · 15 tokens per session scan A 0f6ce8b41b21
skill-creator is a skill published in the GitHub repository HezaoHezao/poirot (217 stars, last pushed 1mo ago), licensed MIT. It adds 15 tokens to every session and 834 once invoked, about $0.0001 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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