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Claude Cowork + AccountsOS

Full accounting plugin for Claude Cowork

The AccountsOS plugin for Claude Cowork gives you 6 slash commands, 4 auto-firing skill packs, and all 13 accounting tools. Run /weekly-check, /log-expense, /vat-check, and more — directly in your Cowork session.

Commands

Skills

Tools

Focused

Get Started View API Docs

Install plugin

cd ~/.claude/plugins
git clone accountsos-cowork-plugin

# Set your API key
export ACCOUNTSOS_API_KEY="sk_live_..."

# Available commands:
# /weekly-check  — Balance, P&L, deadlines
# /log-expense   — Quick expense entry
# /vat-check     — VAT position
# /deadlines     — Upcoming filings
# /invoices      — Invoice overview
# /categorize    — Bulk categorisation

Available Tools

Tool	Description	Scope
`get_transactions`	Query income and expenses with date and direction filters	read
`get_balance`	Check current account balances across all accounts	read
`get_vat_summary`	Get VAT position for any quarter	read
`get_deadlines`	List upcoming filing deadlines	read
`create_transaction`	Record income or expense entries	write
`update_transaction`	Modify transaction details or categories	write
`categorize_transaction`	Get AI category suggestion for a transaction	write
`list_categories`	Browse HMRC-aligned expense and income categories	read
`create_deadline`	Add custom filing deadlines and reminders	write
`search_documents`	Find receipts, invoices, and contracts	read
`upload_document`	Store receipts and invoices with metadata	write
`get_dla_balance`	Check Director's Loan Account with S455 warnings	read
`get_invoices`	List and filter invoices by status	read

Features

6 slash commands: /weekly-check, /log-expense, /vat-check, /deadlines, /invoices, /categorize

4 auto-firing skill packs for UK accounting, VAT, expenses, and tax deadlines

All 13 AccountsOS tools available in every session

Weekly finance check with balance, P&L, and deadline summary

Quick expense logging with AI categorisation

VAT position check with quarterly breakdown

How It Works

Clone the plugin

Clone the AccountsOS Cowork plugin into your Claude plugins directory.

cd ~/.claude/plugins
git clone accountsos-cowork-plugin

Set your API key

Export your AccountsOS API key as an environment variable.

export ACCOUNTSOS_API_KEY="sk_live_..."

Use slash commands

Start any Cowork session and use /weekly-check, /log-expense, /vat-check, and more.

/weekly-check
/log-expense Figma subscription £45
/vat-check Q4 2025

Benefits

Run a full weekly finance check with one command

Log expenses without leaving your coding session

Auto-firing skills inject UK accounting context when needed

Check VAT position before quarterly deadlines

All 13 tools available for complex queries

Frequently Asked Questions

What slash commands are available in the Cowork plugin?

Six commands: /weekly-check (balance, P&L, deadlines), /log-expense (quick expense entry), /vat-check (VAT position), /deadlines (upcoming filings), /invoices (invoice overview), and /categorize (bulk transaction categorisation).

What are the auto-firing skill packs?

Four skill packs that automatically activate when relevant: UK Accounting (general bookkeeping rules), VAT Rules (VAT schemes and thresholds), Expense Categories (HMRC-aligned categories), and Tax Deadlines (Corporation Tax, VAT, Confirmation Statement dates).

Do I need a separate AccountsOS account?

Yes. Sign up at accounts-os.com and generate an API key from your dashboard. The Cowork plugin uses this key to access your accounting data securely.

Can I use the plugin alongside other Cowork plugins?

Yes. The AccountsOS plugin works alongside any other Claude Cowork plugins. The slash commands and skills are namespaced and won't conflict with other plugins.

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