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/d-oit/rust-2026-template/skill-creatornpx skills add d-oit/rust-2026-template --skill skill-creatorgit clone --depth 1 https://github.com/d-oit/rust-2026-templateWhat 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 | $0.00064 | $0.01316 |
| Opus 5 | $0.00032 | $0.00658 |
| Sonnet 5 | $0.00013 | $0.00263 |
| Haiku 4.5 | $0.00006 | $0.00132 |
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 2d 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
When to Use
- User asks for this skill's functionality
Create and improve skills following the Agent Skills specification. A skill extends agent capabilities with specialized knowledge, workflows, and tools.
Core Loop
- Check upstream - Read
.agents/context/external-repos.jsonto see if the skill already exists in a parent template - Capture intent - What should the skill do? When should it trigger?
- Write draft - Create SKILL.md with frontmatter and instructions
- Create test cases - Realistic prompts users would actually say
- Run evals - Test with-skill vs baseline (or old version)
- Review results - Use eval-viewer for human review + benchmarks
- Iterate - Improve based on feedback until satisfied
- Optimize description - Fine-tune frontmatter for better triggering
Before Creating a New Skill
- Check
.agents/context/external-repos.jsonfor related repositories - Read the
shared_skillslist to see if the skill already exists upstream - If the skill exists upstream with
override_local: false, use the canonical version via symlink - If the skill exists but needs local customization, copy it and document overrides in
.agents/context/README.md - Only create a genuinely new skill if no upstream equivalent exists
Skill Specification
Directory Structure
skill-name/
├── SKILL.md # Required: metadata + instructions
├── scripts/ # Optional: executable code
├── references/ # Optional: documentation
├── assets/ # Optional: templates, resources
└── evals/ # Optional: test cases
Frontmatter Fields
| Field | Required | Constraints |
|---|---|---|
name |
Yes | Max 64 chars. Lowercase letters, numbers, hyphens only. |
description |
Yes | Max 1024 chars. Describes what the skill does AND when to use it. |
license |
No | License name or reference to bundled license file. |
compatibility |
No | Max 500 chars. Environment requirements. |
metadata |
No | Arbitrary key-value mapping. |
allowed-tools |
No | Space-delimited list of pre-approved tools. |
What ships with it
4 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.
- 2d ago First seen · 151 lines · 64 tokens per session scan A a23a9cf90d2d
skill-creator is a skill published in the GitHub repository d-oit/rust-2026-template (10 stars, last pushed 3d ago), licensed MIT. It adds 64 tokens to every session and 1,316 once invoked, about $0.0003 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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