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 summarize-redlinesgit 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/summarize-redlines)<a href="https://agentmods.dev/skills/microsoft/cat-agent-skills/summarize-redlines"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/summarize-redlines/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/summarize-redlines"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/summarize-redlines.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 | $0.00146 | $0.02146 |
| Opus 5.5 | $0.00058 | $0.00858 |
| Sonnet 5.5 | $0.00029 | $0.00429 |
| Haiku 4.5 | $0.00015 | $0.00215 |
Grade A, and why
summarize-redlines 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 — 150 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Summarize redlines
Summarise the tracked changes across one or more redlined legal documents and give the user a combined view of what changed, how the changes classify, their practical or legal impact, and which party benefits. This is a read-only analysis: do not suggest, draft or apply edits.
Use the redlined documents as the source of the changes. Clean documents may provide context, but never independently compare clean versions or treat them as redlines.
Before analysing
Identify which supplied documents contain tracked changes, the order or relationship of the redlined versions, the parties and their roles, and which clean documents provide context for each redline.
If any version relationship or party detail is unclear, ask concise numbered questions with a question card and stop; do not analyse until the ambiguity is resolved. If no supplied document contains detectable tracked changes, say plainly that no redline could be identified and ask for a version showing tracked changes — never substitute a general summary or a comparison of clean documents.
When NOT to Use
- Checking a document against a term sheet, heads of terms or other agreed commercial terms — out of scope for this skill.
- Checking a document against legislation, a rulebook or an internal policy — use
identify-regulatory-gaps. - Auditing defined terms, or clause and schedule references, in the marked-up document — use
check-defined-termsorcheck-cross-references. - Extracting duties and dates from the resulting text — use
extract-obligations-and-deadlines. - Pulling the same fields out of several contracts — use
compare-key-terms. - Making, proposing or accepting edits, or resolving tracked changes — use
edit-contract. - A general prose summary of a matter — use
summarize-legal-matters.
Hand-off rule. If a request, or part of one, matches an item above that names another skill, do
not do that part here — even when the documents are already open and the work looks quick. Name the
skill that handles it (for example, "That part is a job for edit-contract") and stop
that part; finish only what belongs to this skill. If the named skill is not installed, say so
plainly and do not attempt it here.
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 · 150 lines · 146 tokens per session scan A 7f669ece3e8d
summarize-redlines is a skill published in the GitHub repository microsoft/cat-agent-skills (101 stars, last pushed yesterday), licensed MIT. It adds 146 tokens to every session and 2,146 once invoked, about $0.0006 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 2026-11-06.
summarize-redlines compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| summarize-redlinesmicrosoft/cat-agent-skills | Skill | 101 | yesterday | MIT | A | 146 | Claude Code, Codex |
| fto-triageanthropics/claude-for-legal | Skill | 9.9k | yesterday | Apache-2.0 | A | 81 | Claude Code |
| legal-holdanthropics/claude-for-legal | Skill | 9.9k | yesterday | Apache-2.0 | A | 68 | Claude Code |
| specification-writingwanshuiyin/Auto-claude-code-research-in-sleep | Skill | 19k | today | MIT | A | 49 | Claude Code |
| regulatory-research-fallbackHKUDS/OpenSpace | Skill | 7.9k | 2d ago | MIT | A | 20 | Claude Code, Codex |
| terms-of-servicegenspark-ai/genoffice | Skill | 12k | today | Apache-2.0 | A | 32 | Claude Code, Codex |
| x-scorecardx-cmd/x-cmd | Skill | 4.7k | 8d ago | Apache-2.0 | A | 57 | Claude Code, Codex |