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/microsoft/cat-agent-skills/_templatenpx skills add microsoft/cat-agent-skills --skill _templategit clone --depth 1 https://github.com/microsoft/cat-agent-skillsWhat 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 | $0.00054 | $0.00217 |
| Opus 5 | $0.00027 | $0.00109 |
| Sonnet 5 | $0.00011 | $0.00043 |
| Haiku 4.5 | $0.00005 | $0.00022 |
Grade A, and why
my-great-skill 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
Write the agent-facing instructions here as Markdown — this body becomes the
"Instructions" section on the detail page (when there's no README.md) and the
downloadable skill.md. The body loads only after the agent has already
decided to use the skill, so don't restate when to use it here — that belongs
in the frontmatter description. Go straight into how to do the task, in the
imperative (address the agent, not the skill — avoid "You are the … skill").
Instructions
- Concrete, numbered steps the agent should follow.
- ...
Guardrails
- What the agent must not do.
Tone
The voice the agent should adopt.
What ships with it
2 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.
- 3d ago First seen · 25 lines · 54 tokens per session scan A 2c830b5a5476
my-great-skill is a skill published in the GitHub repository microsoft/cat-agent-skills (62 stars, last pushed 5d ago), licensed MIT. It adds 54 tokens to every session and 217 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 2026-08-30.
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