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/atomicbot-ai/atomic-agent/skill-creatornpx skills add AtomicBot-ai/atomic-agent --skill skill-creatorgit clone --depth 1 https://github.com/AtomicBot-ai/atomic-agentWhat 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 | $0.00032 | $0.00519 |
| Opus 5 | $0.00016 | $0.00260 |
| Sonnet 5 | $0.00006 | $0.00104 |
| Haiku 4.5 | $0.00003 | $0.00052 |
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 3d 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.
What it actually says
skill-creator
Critical — invalid files are skipped at load
SKILL.md must start with the bytes --- then a newline, YAML mapping, closing --- line, then markdown body.
If the file starts with # Title or prose without that frontmatter block, the runtime drops the skill (parse error); it will not appear in ### skills.
Minimal valid template (copy and edit)
---
name: my-skill-name
description: One line when to load this skill and what it does (English ok).
version: 1.0.0
requires_tools: []
requires_scripts: []
dangerous: false
---
# my-skill-name
Body here. Use real tool names: `skill.view`, `os.http.request`, `browser.search`, …
Rules:
name— kebab-case, same string as the parent folder (my-skill-name/SKILL.md→name: my-skill-name).descriptionandversion— required non-empty strings.requires_tools/requires_scripts— optional lists (documentation); omit empty keys if you prefer.
Where to write files
| Scope | Path |
|---|---|
| Global | <stateDir>/skills/<name>/SKILL.md (default ~/.atomic-agent/skills/) |
| Project | <workingDir>/.atomic-agent/skills/<name>/SKILL.md — overrides global on name clash |
One folder per skill; single SKILL.md at folder root.
Workflow
- Create folder +
SKILL.mdusing the template above (frontmatter first). - Keep
descriptionshort; put procedures in the body (visible only afterskill.view). - Restart the agent / call
refreshSkillsso the registry rescans disk. - Verify with
atomic-agent skill list(showsWARN:lines for broken dirs).
Do not
- Skip YAML — ever.
- Put secrets in the file or instruct bypassing approvals / HTTP allowlists.
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.
- 3d ago First seen · 63 lines · 32 tokens per session scan A 73109641c46e
skill-creator is a skill published in the GitHub repository AtomicBot-ai/atomic-agent (2,438 stars, last pushed today), licensed MIT. It adds 32 tokens to every session and 519 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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