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 HoangNguyen0403/agent-skills-standard --skill common-skill-creatorgit clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standardWrote 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/hoangnguyen0403/agent-skills-standard/common-skill-creator)<a href="https://agentmods.dev/skills/hoangnguyen0403/agent-skills-standard/common-skill-creator"><img src="https://agentmods.dev/badge/skills/hoangnguyen0403/agent-skills-standard/common-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/hoangnguyen0403/agent-skills-standard/common-skill-creator"><img src="https://agentmods.dev/badge/skills/hoangnguyen0403/agent-skills-standard/common-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 | $0.00075 | $0.01559 |
| Opus 5 | $0.00037 | $0.00779 |
| Sonnet 5 | $0.00015 | $0.00312 |
| Haiku 4.5 | $0.00007 | $0.00156 |
Grade A, and why
common-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 12d 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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Skill Creator Standard
Priority: P0 (CRITICAL)
Applies to every skill in this registry. Maximize Token ROI. Every line in SKILL.md must provide specific procedural value. Activation (how it triggers) and Implementation (how it helps) primary quality metrics.
Three-Level Loading System
- Level 1 Frontmatter:
name+description(Activation Anchor), ≤100 words. - Level 2 SKILL.md body: Core Rules + Workflows (Implementation Core), ≤100 lines.
- Level 3 references/: Detailed examples, schemas, and "TESTS.md" (On-demand).
Workflow (New or Existing Skill)
New skill:
- Research — web-search domain best practices, checklists, and standards; extract key terms → triggers, workflows → guidelines, mistakes → anti-patterns. See Web Search Research.
- Capture intent — what it , when it trigger, expected output format?
- Draft the SKILL.md — draft using TEMPLATE.md
- Test — spawn parallel subagents: one with-skill, one without-skill (baseline)
- Evaluate — grade assertions, review benchmark (pass rate, tokens, time)
- Iterate — rewrite based on feedback, rerun into next iteration dir, repeat
- Optimize description — run trigger eval queries, target ≥80% accuracy
- Pressure-test — for discipline skills, capture agent excuses, red flags, and stop conditions Existing skill:
- Audit — run Quality Checklist below; identify violations
- Snapshot —
cp -r <skill-dir> <workspace>/skill-snapshot/before any edits - Improve SKILL.md — fix violations, compress, move oversized content to
references/ - Test — spawn parallel subagents: one with-new-skill, one with-snapshot (baseline)
- Evaluate & iterate — same as steps 4–5 above
- Optimize description — re-run trigger eval if description changed
- Harden — add rationalization counters where agents still fail under pressure See Eval Workflow for full testing + iteration details.
What ships with it
11 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.
- references/anti-patterns.md 1.2 KB
- references/benchmark.md 2.4 KB
- references/eval-workflow.md 3.5 KB
- references/lifecycle.md 4.8 KB
- references/resource-organization.md 7.0 KB
- references/rubric.md 3.3 KB
- references/size-limits.md 266 B
- references/TEMPLATE.md 1.3 KB
- references/tessl-best-practices.md 2.2 KB
- references/testing.md 6.3 KB
- references/web-search-research.md 3.7 KB
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.
- 12d ago First seen · 99 lines · 75 tokens per session scan A 8f747abad000
common-skill-creator is a skill published in the GitHub repository HoangNguyen0403/agent-skills-standard (565 stars, last pushed 3d ago), licensed MIT. It adds 75 tokens to every session and 1,559 once invoked, about $0.0004 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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