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 tax-preparationgit 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/tax-preparation)<a href="https://agentmods.dev/skills/microsoft/cat-agent-skills/tax-preparation"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/tax-preparation/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/tax-preparation"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/tax-preparation.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 | $0.00134 | $0.11689 |
| Opus 5.5 | $0.00054 | $0.04676 |
| Sonnet 5.5 | $0.00027 | $0.02338 |
| Haiku 4.5 | $0.00013 | $0.01169 |
Grade A, and why
tax-preparation 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 — 485 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tax Preparation
Important: This skill assists with tax preparation, provision, and compliance workflows but does not provide tax or legal advice. All tax positions, filings, and deliverables must be reviewed and signed off by a qualified tax professional (CPA / Tax Director / Tax Manager) before they are filed, posted, or sent to a requesting stakeholder or taxing authority.
Methodology and best practices across the tax preparation lifecycle: income tax provision and account analysis, tax projections and estimated payments, entity-election and tax-savings analysis, reasonable compensation, indirect tax reconciliation and audit-ready packages, tax authority notice/audit response, and filing readiness.
This skill supplies the tax-specific layer of each deliverable: the tax classification taxonomy (current/deferred, permanent/temporary, valuation allowance, UTB) and the one-discrete-tax-effect-per-entry rule for journal entries; the indirect-tax population, root-cause taxonomy and tax-determination traceability for reconciliations; the ASC 740 rate-reconciliation driver taxonomy for rate bridges; and the jurisdiction due dates, document requirements and Outlook mechanics for a filing-deadline calendar. Read Reconciliation Standards before you build a workbook: live formulas, tie-outs, completeness and structure lock.
A tax-authority audit is not SOX 404 internal-controls testing, despite the shared word "audit". Do not substitute a SOX workpaper template for a notice response package; see Tax Authority Notice & Audit Response below.
Classification-Before-Computation Discipline
Several sections below require testing an item against a classification rule - business vs. nonbusiness income, which rate governs, whether a provision conforms - before that item can correctly enter a computation. Apply this same discipline everywhere a classification test is named below, rather than treating it as one optional step among several:
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.
- 2d ago First seen · 485 lines · 134 tokens per session scan A 07a4dcbe02d7
tax-preparation is a skill published in the GitHub repository microsoft/cat-agent-skills (101 stars, last pushed yesterday), licensed MIT. It adds 134 tokens to every session and 11,689 once invoked, about $0.0005 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.
tax-preparation compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| tax-preparationmicrosoft/cat-agent-skills | Skill | 101 | yesterday | MIT | A | 134 | Claude Code, Codex |
| expense-review-policyopenai/openai-cookbook | Skill | 77k | 2d ago | MIT | A | 17 | Claude Code, Codex |
| audit-supportanthropics/knowledge-work-plugins | Skill | 35k | yesterday | Apache-2.0 | A | 45 | Claude Code |
| kyc-doc-parseanthropics/financial-services | Skill | 41k | 11d ago | Apache-2.0 | A | 49 | Claude Code |
| ma-playbookalirezarezvani/claude-skills | Skill | 29k | 3d ago | MIT | A | 29 | Claude Code |
| fiscalisteromainsimon/paperasse | Skill | 2.6k | 3d ago | MIT | A | 320 | Claude Code, Codex |
| subcontractor-payment-trackerdatadrivenconstruction/DDC_Skills_for_AI_Agents_in_Construction | Skill | 397 | 20d ago | MIT | A | 25 | Claude Code, Codex |