microsoft/cat-agent-skills is a static website that catalogs reusable instruction sets and related packages for AI agents. People use it to search, filter, rate, and download skills for Cowork, Copilot Studio, and Scout, along with Copilot plugins and Scout automations. The catalogue entries are the skills, instructions, plugins, and settings displayed by the site.
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 microsoft/cat-agent-skills --skill closure-checkgit clone --depth 1 https://github.com/microsoft/cat-agent-skillsWrote 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/microsoft/cat-agent-skills/closure-check)<a href="https://agentmods.dev/skills/microsoft/cat-agent-skills/closure-check"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/closure-check/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/microsoft/cat-agent-skills/closure-check"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/closure-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00056 | $0.00299 |
| Opus 5.5 | $0.00022 | $0.00120 |
| Sonnet 5.5 | $0.00011 | $0.00060 |
| Haiku 4.5 | $0.00006 | $0.00030 |
Grade A, and why
closure-check 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 today.
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
Closure Check (Govern)
Purpose
Deterministic closure gate per capa-rules.md #6: containment, verified root cause, CA (+PA if systemic), complete effectiveness checks, verification evidence. Compliance determination IS the work here.
When to use
On any closure question, and before eightd-draft finalizes.
Inputs
capa.json (closure{} populated by capa_logic).
Steps
- Validate against the contract.
- Read closure.ready and closure.blockers[] from the engine output; quote them verbatim.
- A CAPA with blockers is presented as OPEN with named blockers - never as "basically done".
Output
Confirmed closure{} - the Govern hop.
Grounding requirements
Every blocker cites its rule section.
Constraints
- The model never closes a CAPA; it reports the engine's gate and the human decides.
- Schedule pressure ("close by Friday") never removes a blocker.
Escalation / uncertainty
ready=false with pressure to close: escalate to the quality manager explicitly.
What ships with it
7 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.
- today First seen · 27 lines · 56 tokens per session scan A 35a1693407fe
closure-check is a skill published in the GitHub repository microsoft/cat-agent-skills (93 stars, last pushed today), licensed MIT. It adds 56 tokens to every session and 299 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-10-28.
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