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 terrene-foundation/kailash-coc-claude-py --skill skill-authoringgit clone --depth 1 https://github.com/terrene-foundation/kailash-coc-claude-pyWrote 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/terrene-foundation/kailash-coc-claude-py/skill-authoring)<a href="https://agentmods.dev/skills/terrene-foundation/kailash-coc-claude-py/skill-authoring"><img src="https://agentmods.dev/badge/skills/terrene-foundation/kailash-coc-claude-py/skill-authoring/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/terrene-foundation/kailash-coc-claude-py/skill-authoring"><img src="https://agentmods.dev/badge/skills/terrene-foundation/kailash-coc-claude-py/skill-authoring.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 | $0.00032 | $0.03297 |
| Opus 5 | $0.00016 | $0.01648 |
| Sonnet 5 | $0.00006 | $0.00659 |
| Haiku 4.5 | $0.00003 | $0.00330 |
Grade A, and why
skill-authoring 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 9d 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 — 237 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Authoring
Reference for authoring and auditing skills across CC, Codex, and Gemini. Skills are L2 (Context) artifacts in the COC 5-layer architecture per rules/cc-artifacts.md — distinct from agents (L1 Intent), rules (L3 Guardrails), commands (L4 Instructions), and hooks (L3 Guardrails deterministic).
When To Use
Authoring a new skill. Auditing an existing skill for description-length, progressive-disclosure, or cross-CLI portability. Deciding whether a body of knowledge belongs in a skill (reference content, semantically-activated) versus an agent (judgment + procedure) or a rule (boundary enforcement).
Quick Reference
| Field | Constraint |
|---|---|
name: |
Lowercase, hyphen-separated. Matches directory name. |
description: |
≤200 chars. Failure-mode language. No keyword-dump ('X', 'Y', 'Z', ...). |
tools: |
Preferred for new skills. Neutral identifier set across CLIs. |
allowed-tools: |
CC-native legacy form. Equivalent semantics; emitter renames at distribute time. |
| SKILL.md body | 150–250 lines. MUST answer 80% of routine questions without sub-file reads. |
| Sub-files | <skill-dir>/<topic>.md. Loaded on demand via SKILL.md cross-reference. |
Directory Layout
.claude/skills/<skill-name>/
├── SKILL.md ← primary entry, frontmatter-bearing
├── <topic-1>.md ← progressive-disclosure depth
├── <topic-2>.md
└── fixtures/ ← optional: example inputs the skill references
The directory name MUST match name: in SKILL.md frontmatter. Numbered prefixes (01-, 02-) are conventional for ordering but not load-bearing; semantic activation uses description: only.
The description: Field IS The Activation Mechanism
What ships with it
1 file 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.
- 9d ago First seen · 237 lines · 32 tokens per session scan A 7252c7e1b4be
skill-authoring is a skill published in the GitHub repository terrene-foundation/kailash-coc-claude-py (12 stars, last pushed 24d ago), licensed Apache-2.0. It adds 32 tokens to every session and 3,297 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 2026-09-03.
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