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AccountsOS

Official registry Finance and payments

Query your live AccountsOS books: balances, transactions, VAT, deadlines, invoices.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http accountsos 'https://accounts-os.com/api/mcp/plugin'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "accountsos": {
            "type": "http",
            "url": "https://accounts-os.com/api/mcp/plugin"
        }
    }
}
NPM package @thriveventurelabs/accountsos-mcp
Claude Code 
claude mcp add accountsos -e 'ACCOUNTSOS_API_KEY=<your accountsos_api_key>' -e 'ACCOUNTSOS_BASE_URL=<ACCOUNTSOS_BASE_URL>' -- npx -y @thriveventurelabs/accountsos-mcp@0.3.1
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "accountsos": {
            "command": "npx",
            "args": [
                "-y",
                "@thriveventurelabs/accountsos-mcp@0.3.1"
            ],
            "env": {
                "ACCOUNTSOS_API_KEY": "<your accountsos_api_key>",
                "ACCOUNTSOS_BASE_URL": "<ACCOUNTSOS_BASE_URL>"
            }
        }
    }
}

Environment variables

  • ACCOUNTSOS_API_KEY required secret Your AccountsOS API key (from https://accounts-os.com/settings)
  • ACCOUNTSOS_BASE_URL Override API base URL (default https://accounts-os.com)

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. AccountsOS MCP Server
  2. Installation
  3. Available Tools
  4. Available Resources
  5. Example Prompts
  6. Development
  7. Environment Variables
  8. Troubleshooting
  9. Disclaimer
  10. License

AccountsOS MCP Server

Query your live AccountsOS ledger from any MCP client (Claude Desktop, Claude Code, Cursor) via the Model Context Protocol.

AccountsOS runs jurisdiction playbooks for 26 countries. The UK is the proof jurisdiction, with live HMRC MTD VAT filing.

npm: https://www.npmjs.com/package/@thriveventurelabs/accountsos-mcp

Installation

npm install -g @thriveventurelabs/accountsos-mcp

Then add to Claude Desktop config:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "accountsos": {
      "command": "accountsos-mcp",
      "args": [],
      "env": {
        "ACCOUNTSOS_API_KEY": "your-api-key-here"
      }
    }
  }
}
Option 2: Using npx
{
  "mcpServers": {
    "accountsos": {
      "command": "npx",
      "args": ["--yes", "@thriveventurelabs/accountsos-mcp@latest"],
      "env": {
        "ACCOUNTSOS_API_KEY": "your-api-key-here"
      }
    }
  }
}

Get your API key from AccountsOS Settings.

Available Tools

Read Operations
ToolDescription
get_transactionsQuery transactions with filters (date, category, amount, search)
get_balanceGet current account balance(s)
get_deadlinesView upcoming tax and filing deadlines
get_vat_summaryGet VAT summary for any quarter
search_documentsSearch uploaded receipts and invoices
list_categoriesList available UK GAAP transaction categories
Write Operations
ToolDescription
create_transactionCreate a new transaction (with auto-categorization)
update_transactionUpdate category, notes, or reconciliation status
categorize_transactionGet AI-suggested category for a transaction
create_deadlineCreate a new tax/filing deadline reminder

Available Resources

ResourceDescription
accountsos://companyCompany details and settings
accountsos://transactionsMost recent 50 transactions
accountsos://documentsUploaded documents
accountsos://deadlinesUpcoming deadlines

Example Prompts

Once connected, try asking Claude:

  • "What's my account balance?"
  • "Show me transactions from last month"
  • "When is my next VAT deadline?"
  • "How much have I spent on software subscriptions?"
  • "Create a transaction for lunch with a client, £45"
  • "What's my VAT summary for Q4 2024?"

Development

# Install dependencies
npm install

# Build
npm run build

# Run locally (for testing)
ACCOUNTSOS_API_KEY=sk_live_xxx npm start

Environment Variables

VariableRequiredDescription
ACCOUNTSOS_API_KEYYesYour AccountsOS API key
ACCOUNTSOS_BASE_URLNoOverride API base URL (default: https://accounts-os.com)

Troubleshooting

Server disconnected

Check logs at ~/Library/Logs/Claude/mcp-server-accountsos.log

npx issues

If npx has caching issues, use global install instead:

npm install -g @thriveventurelabs/accountsos-mcp

Disclaimer

This software provides general guidance about UK tax and accounting rules. It is not a substitute for professional advice from a qualified accountant or tax adviser. Always verify with HMRC source documents and consult a professional for advice specific to your circumstances.

License

MIT

Frequently asked questions

What is AccountsOS?

Query your live AccountsOS books: balances, transactions, VAT, deadlines, invoices.

How do I install AccountsOS?

It runs as a remote server. In Claude Code: claude mcp add --transport http accountsos 'https://accounts-os.com/api/mcp/plugin'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does AccountsOS need an API key?

Yes. It expects ACCOUNTSOS_API_KEY, which you set in its configuration.

Is AccountsOS open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains AccountsOS?

It is published by thriveventurelabs. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.