{
  "markdown": "# AccountsOS Agent Plugin\n\nUK accounting for Claude Cowork, Claude Code, Grok Build and Cursor. Track transactions, manage VAT, monitor HMRC deadlines, and categorise expenses through natural language. Verified for the **2026/27 tax year**.\n\nOne repo serves all three ecosystems: `.claude-plugin/plugin.json` (Claude), `.grok-plugin/plugin.json` (Grok Build) and `.cursor-plugin/plugin.json` (Cursor) describe the same skills, commands and MCP connector.\n\nBuilt on the AccountsOS MCP server. Pairs with Anthropic's official [knowledge-work-plugins/finance](https://github.com/anthropics/knowledge-work-plugins/tree/main/finance): that plugin gives you US-GAAP methodology (journal entries, reconciliation, close management); this one gives you UK regulatory truth.\n\n---\n\n## Install\n\n### Via Claude (Cowork or Claude Code)\n\n```bash\nclaude plugin install thriveventurelabs/accountsos-agent-plugin\n```\n\n### Via Grok Build\n\nInstall `accountsos` from the built-in plugin marketplace (`xai-org/plugin-marketplace` catalog).\n\n### Via Cursor\n\nOpen **Cursor Settings → Plugins**, search for **AccountsOS**, click **Install**, then set your API key when prompted. Or run `/add-plugin accountsos` in chat.\n\n### Manual\n\n```bash\ncd ~/.claude/plugins\ngit clone https://github.com/thriveventurelabs/accountsos-agent-plugin.git\n```\n\n## Configure\n\nSet your AccountsOS API key as an environment variable (Cursor prompts for it in the plugin's Configure panel instead):\n\n```bash\nexport ACCOUNTSOS_API_KEY=\"sk_live_...\"\n```\n\nGet your API key from [accounts-os.com](https://accounts-os.com) under Settings → API Keys, or have your agent self-signup via the [agent endpoint](https://accounts-os.com/skill.md).\n\n---\n\n## What's Included\n\n### 6 Slash Commands\n\n| Command | What it does |\n|---------|-------------|\n| `/weekly-check` | Full financial review: balance, transactions, deadlines, VAT, invoices, DLA |\n| `/log-expense` | Quick expense logging with auto-categorisation |\n| `/vat-check` | Quarterly VAT position and filing checklist |\n| `/deadlines` | Filing deadline overview with penalty warnings |\n| `/invoices` | Outstanding and overdue invoices with chase suggestions |\n| `/categorize` | Bulk review and categorise uncategorised transactions |\n\n### 4 Skills (auto-fire)\n\n| Skill | When it fires | Covers |\n|-------|--------------|--------|\n| **uk-accounting** | Director / CT / dividends / capital allowances queries | Corp Tax 2026/27 (19/25%), dividend allowance £500, salary vs dividend, DLA + S455, capital allowances (AIA £1m + Full Expensing), R&D merged scheme, BADR (10/14/18%) |\n| **vat-rules** | VAT / MTD / registration questions | £90k registration threshold, £88k deregistration, schemes (Standard/Cash/Flat Rate/Annual), MTD VAT mandatory, MTD ITSA from April 2026 |\n| **expense-categories** | Expense / receipt / claim questions | What's deductible, mileage rates 45p/25p, home office (sole trader simplified £10/£18/£26), trivial benefits £50/£300, capital vs revenue |\n| **tax-deadlines** | Deadline / penalty / filing questions | CT600 (12m + 9m1d), Confirmation Statement (£34/£62 fee, 14 days), accounts (9m), VAT (1m+7d), SA (31 Jan online), MTD ITSA quarterly, late penalties |\n\n### 13 API Tools (via MCP)\n\nFull read/write access to your accounting data. See [CONNECTORS.md](./CONNECTORS.md) for the complete tool reference.\n\n**Read**: `get_transactions`, `get_balance`, `get_vat_summary`, `get_deadlines`, `get_invoices`, `get_dla_balance`, `list_categories`, `search_documents`\n\n**Write**: `create_transaction`, `update_transaction`, `categorize_transaction`, `create_deadline`, `upload_document`\n\n---\n\n## What this plugin does that vanilla Claude doesn't\n\nVanilla Claude knows accounting concepts but **drifts** on UK specifics, it'll quote a 2024/25 dividend allowance, an old VAT threshold, or a wrong CT filing rule. This plugin pins Claude to **verified, sourced** UK rules, every fact citing gov.uk.\n\nConcretely:\n- Confirmation Statement fee: £34 online (NOT £13, raised May 2024)\n- Dividend allowance: £500/year (NOT £1,000 or £2,000)\n- Class 2 NI: abolished for self-employed from April 2024\n- BADR rates: 18% from 6 April 2026 (was 14% 2025/26, was 10% before April 2025)\n- Employer NI: 15% above £5,000 (rate AND threshold both changed April 2025)\n- Trivial benefits: £50/item AND £300/year director cap\n- Full Expensing is COMPANIES ONLY (not sole traders/partnerships)\n\n---\n\n## Requirements\n\n- Claude Cowork, Claude Code, Grok Build or Cursor with plugin support\n- AccountsOS account ([sign up free](https://accounts-os.com/signup), Early Access pricing)\n- API key with `read` + `write` scopes\n\n## Network endpoints and credentials\n\nDeclared for plugin-marketplace security review:\n\n- **The only network endpoint this plugin calls is `https://accounts-os.com/api/mcp`** (the AccountsOS hosted MCP server, HTTPS), configured in [`.mcp.json`](./.mcp.json).\n- **The only credential it uses is `ACCOUNTSOS_API_KEY`**, read from your environment and sent as a Bearer token to that endpoint. You create and revoke the key yourself in AccountsOS Settings, scoped to `read` + `write` on your own company data.\n- No lifecycle hooks, no shell execution, no postinstall scripts, no telemetry. Skills and commands are plain markdown.\n\n## Privacy\n\nYour AccountsOS data stays in your AccountsOS account (Supabase eu-west-2). The plugin sends queries to your AccountsOS API key and the agent reads the responses. No customer financial data is sent to the model provider in your context except the responses you receive.\n\n## UK Specificity\n\nBuilt for UK Limited Companies and sole traders. Knows HMRC rules, Companies House requirements, VAT schemes, MTD compliance, and 2026/27 tax year figures.\n\nFor US, AU, UAE, India: see roadmap on [accounts-os.com/roadmap](https://accounts-os.com).\n\n---\n\n## Links\n\n- [AccountsOS](https://accounts-os.com)\n- [API Documentation](https://accounts-os.com/skill.md)\n- [Support](mailto:hello@accounts-os.com)\n- [Anthropic finance plugin (companion)](https://github.com/anthropics/knowledge-work-plugins/tree/main/finance)\n\nBuilt by [Thrive Venture Labs](https://thriveventurelabs.com)\n",
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}