update-tax-rates

update-tax-rates is a skill for Claude Code from unchainedshop/unchained. It costs 86 tokens per session (1,020 once invoked), scanned A, original, EUPL-1.2.

A procedure for checking and updating tax-rate tables for Switzerland, the European Union, the United Kingdom, and the United States against official sources.

In plain words
What is it for?
Use it when a tax-rate change is announced or takes effect, or when performing the periodic verification of the bundled rate files.
Why use it?
It helps keep the tax and VAT rates used by pricing software accurate when rates change or during yearly checks. VAT is a tax added to many goods and services.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Good fit Use it when a tax-rate change is announced or takes effect, or when performing the periodic verification of the bundled rate files.

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Install with agentmods
npx agentmods add skills/unchainedshop/unchained/update-tax-rates
Install

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.

Any agent
npx skills add unchainedshop/unchained --skill update-tax-rates
Clone the repo
git clone --depth 1 https://github.com/unchainedshop/unchained

Made for: Claude Code.

Wrote 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.

agentmods badge for update-tax-rates

README.md
[![agentmods](https://agentmods.dev/badge/skills/unchainedshop/unchained/update-tax-rates/github.svg)](https://agentmods.dev/skills/unchainedshop/unchained/update-tax-rates)
Your own site
<a href="https://agentmods.dev/skills/unchainedshop/unchained/update-tax-rates"><img src="https://agentmods.dev/badge/skills/unchainedshop/unchained/update-tax-rates/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.

agentmods 80×15 button for update-tax-rates

Your own site · 80×15
<a href="https://agentmods.dev/skills/unchainedshop/unchained/update-tax-rates"><img src="https://agentmods.dev/badge/skills/unchainedshop/unchained/update-tax-rates.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 86 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,020 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00086 $0.01020
Opus 5 $0.00043 $0.00510
Sonnet 5 $0.00017 $0.00204
Haiku 4.5 $0.00009 $0.00102

Measured 9d ago against content hash 20f454a76ee8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

update-tax-rates 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.

.claude/skills/update-tax-rates/SKILL.md · 73 lines

The source is not reproduced here

Licensed EUPL-1.2

The repository is licensed EUPL-1.2, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

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.

  1. 9d ago First seen · 73 lines · 86 tokens per session scan A 20f454a76ee8

Subscribe to this mod's changes

update-tax-rates is a skill published in the GitHub repository unchainedshop/unchained (201 stars, last pushed yesterday), licensed EUPL-1.2. It adds 86 tokens to every session and 1,020 once invoked, about $0.0004 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.