Invoice Line Arithmetic and Source Review Agent Skill

Name: Invoice Line Arithmetic and Source Review
Price: 5 USD
Author: Vincent Chen

Review local invoice line equations with exact decimal strings and source references.…

You say

“Review local invoice line equations with exact decimal strings and source references. Reports missing amounts and discre”

It also answers to “Review this extracted synthetic invoice JSON for missing values and arithmetic differences. Preserve page and row refere”.

Buy it · $5 Read its declaration first $5 Written by Vincent Chen

Context cost: 14.9k tokensestimated from the bundle, loaded when it triggers
Bundle: 11 files · 69.9 kB1 script among them — read before you run
Licence: Proprietarythe author’s own terms
Last change: 8 days agov1.0.1
Servers it uses: Noneruns standalone

What it does

Review local invoice line equations with exact decimal strings and source references.…

What this skill changes about the agent has not been set out here as a list. Its SKILL.md says it in the author’s own words and comes with the purchase; the declaration below is the part shown before it is bought.

Workflow

Runs a procedure end to end.

Filed under

Finance & Commerce

The skill itself

Before it is bought, this page shows its declaration — the front matter that loads with every session. The body, which loads when the skill triggers, comes with the purchase.

SKILL.md5.6 kB · preview

--- name: "ai-venture-lab-invoice-line-arithmetic" license: "Proprietary" metadata: author: "AI Venture Lab" version: "1.0.1" triggers: |- Review local invoice line equations with exact decimal strings and source references. Reports missing amounts and discrepancies without tax inference or silent rounding. Review this extracted synthetic invoice JSON for missing values and arithmetic differences. Preserve page and row references without guessing tax rates. display_name: "发票行项精确算术与原文定位核对" display_name_en: "Invoice Line Arithmetic and Source Review" description_zh: "离线核对发票行项的数量、单价、折扣、税额和申报金额，逐项输出差异与原文定位；不推断税率、不静默舍入。" description_en: "Review local invoice line equations with exact decimal strings and source references. Reports missing amounts and discrepancies without tax inference or silent rounding." examples_zh: "请核对这份已提取的合成发票JSON，逐行指出缺项和金额差异，并保留页码与行号，不替我猜税率。" examples_en: "Review this extracted synthetic invoice JSON for missing values and arithmetic differences. Preserve page and row references without guessing tax rates." ---

The instructions themselves come with the skill. What is shown here is its declaration — the name and the description the agent matches on.

In the file

SKILL.md692 words

Files11

LicenceProprietary

Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈310

always loaded

The name and description, so the model knows the skill exists and when to reach for it.

14,565

on trigger

The instruction body and 10 supporting files, read only when the skill fires.

7.4%

of a 200k window

Ten skills this size would take about 74% of the window before you open a file.

050k100k150k200k context window

14.9k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md, which comes with the purchase.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for

Writes filesnot declared

Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

If this is not it

2403 other skills in Finance & Commerce

What is in the bundle

11 files, 69.9 kB on disk. Mostly text — the instructions the model reads — with 1 script in it that your client would run only if the instructions tell it to.

LICENSE-CODE.txt0.3 kB
LICENSE-CPython.txt13.9 kB
LICENSE-Host.txt32.8 kB
LICENSE-libmpdec.txt1.4 kB
NOTICE.txt0.9 kB
RUNTIME.json0.7 kB
SKILL.md5.6 kB
assets/icon.svg2.1 kB
examples/normal.json0.5 kB
references/input-schema.json1.3 kB
scripts/run.py10.4 kB

What is not in it

A skill installs nothing and depends on nothing: it is a folder your client reads. This one carries 1 script beside the text, so the bundle is 11 files: the list is public, the text comes with the purchase. The Proprietary licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

$5 once

Invoice Line Arithmetic and Source Review · Proprietary · Vincent Chen

one-time

Price$5 once

LicenceProprietary — the author’s, unchanged by this purchase

Paid throughStripe, once, on the card you add at the checkout

Keeps workingfor good — the files are yours once they are on disk

Updatesevery release of 1.x through this account

Before paying you can read its declaration above — the name and the description the agent matches on, and the list of files it ships. The instructions themselves come with the purchase: the folder packaged and handed to your machine by key, every update its author ships, and our support if it does not do what this listing says. The terms of use are Proprietary, set by the author and unchanged by buying it here.

Payment runs through Stripe, on a page like this one rather than a redirect. It is charged once, today, and gets its own receipt in Billing; a card saved here is reused for later purchases.

# Invoice Line Arithmetic and Source Review · 14.9k tokens when loaded
npx mcprush@latest skill add vincent-chen/invoice-line-arithmetic-and-source-review

Or without Node (macOS, Linux)

sh -c ': "${MCPRUSH_KEY:?export MCPRUSH_KEY first: your key is at https://mcprush.com/dashboard#access}"' &&
  mkdir -p .claude/skills && t=$(mktemp -d) &&
  { curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/invoice-line-arithmetic-and-source-review/bundle.tar.gz -H "Authorization: Bearer $MCPRUSH_KEY" || { curl -sS https://mcprush.com/api/skills/invoice-line-arithmetic-and-source-review/bundle.tar.gz -H "Authorization: Bearer $MCPRUSH_KEY"; echo; false; }; } &&
  tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/invoice-line-arithmetic-and-source-review" ] &&
  { [ ! -e .claude/skills/invoice-line-arithmetic-and-source-review ] || { mv .claude/skills/invoice-line-arithmetic-and-source-review "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } &&
  mv "$t/invoice-line-arithmetic-and-source-review" .claude/skills/ && echo "Installed .claude/skills/invoice-line-arithmetic-and-source-review"

Both lines need your key from https://mcprush.com/dashboard#access. The npx line takes the one you logged in with (npx mcprush@latest login) and says why if it is refused; the curl line reads it from MCPRUSH_KEY, so export it first, and prints the reason too if the download is refused. Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/invoice-line-arithmetic-and-source-review/ in the current project. For every project instead, run sh -c ': "${MCPRUSH_KEY:?export MCPRUSH_KEY first: your key is at https://mcprush.com/dashboard#access}"' && mkdir -p ~/.claude/skills && t=$(mktemp -d) && { curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/invoice-line-arithmetic-and-source-review/bundle.tar.gz -H "Authorization: Bearer $MCPRUSH_KEY" || { curl -sS https://mcprush.com/api/skills/invoice-line-arithmetic-and-source-review/bundle.tar.gz -H "Authorization: Bearer $MCPRUSH_KEY"; echo; false; }; } && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/invoice-line-arithmetic-and-source-review" ] && { [ ! -e ~/.claude/skills/invoice-line-arithmetic-and-source-review ] || { mv ~/.claude/skills/invoice-line-arithmetic-and-source-review "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/invoice-line-arithmetic-and-source-review" ~/.claude/skills/ && echo "Installed ~/.claude/skills/invoice-line-arithmetic-and-source-review" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/invoice-line-arithmetic-and-source-review/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as ai-venture-lab-invoice-line-arithmetic in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, invoice-line-arithmetic-and-source-review.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/

Claude DesktopCustomize › Skills

ChatGPTSkills › Create › Upload

Cursor.cursor/skills/

VS Code.github/skills/

Codex CLI.agents/skills/

Gemini CLI.gemini/skills/

Grok Build.grok/skills/

Microsoft CopilotSkills › Upload a skill

PerplexityComputer › Skills › Upload a skill

DeepSeek Harness.dsh/skills/

Zed.agents/skills/

Devin Desktop.devin/skills/

Windsurf (legacy).windsurf/skills/

OpenAI Agents SDKInstructions or sandbox Skills

HTTP / APIa request parameter

This release

Version1.0.1

Published8 days ago

Price$5

Referencevincent-chen/invoice-line-arithmetic-and-source-review

Versions

v1.0.1 shipped 8 days ago. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

v1.0.1

2 Nov 2026

The version this listing went live with, after review.

Pinning

The install command always fetches the release that is current the day you run it — v1.0.1 today — and cannot ask for an earlier one. The copy on your disk does not change until you run it again.

Reviews

—no reviews yet

Nobody has reviewed this skill yet. The rating is the mean of the reviews written here, so there is none until somebody writes the first.

Sign in to review it

A review is tied to an account so it can be answered, edited and taken down by the person who wrote it.

Who can post

Anybody with an account, one review each. It carries the version that was current when you wrote it, and the publisher may reply once.

Who wrote it

Vincent Chen

Publishes on mcprush.

0 servers listed5 skills listed

Profile

Publisher

Servers0