PolyAccounts synthetic accounting demo MCP server

PolyAccounts agent kit

Accounting for companies that work with AI agents.

Evaluate exact balances and traceable ledger evidence before connecting a company. This repository contains only public connector code and invented demonstration data.

npx -y --package=https://github.com/andrewblount/polyaccounts-agent-kit/releases/download/v1.2.1/polyaccounts-mcp-1.2.1.tgz polyaccounts-mcp        # full connector. with no credential, call create_sandbox
npx -y --package=https://github.com/andrewblount/polyaccounts-agent-kit/releases/download/v1.2.1/polyaccounts-mcp-1.2.1.tgz polyaccounts-demo   # read-only synthetic demo

PolyAccounts is in early access. Evaluate with synthetic data in a sandbox or an approved workspace. Do not use this release for real customer books or statutory accounting. Reads are not metered. Limits and quotas: https://polyaccounts.com/limits.

Workflows

Reusable, model-agnostic procedures in workflows/: expense review, financial review, matter billing cycle for law firms, month-end close, and trust three-way reconciliation.

Install the demo

Download polyaccounts-demo.mcpb and open it in an MCPB-compatible client. For Claude Desktop, use Settings, Extensions, Advanced settings, Install Extension. Review the extension before installing. No account, database, API key or network connection is needed after installation.

For a stdio client, use this pinned configuration.

{
  "mcpServers": {
    "polyaccounts-demo": {
      "command": "npx",
      "args": [
        "--yes",
        "--package=https://github.com/andrewblount/polyaccounts-agent-kit/releases/download/v1.2.1/polyaccounts-mcp-1.2.1.tgz",
        "polyaccounts-demo"
      ]
    }
  }
}

Windows clients that cannot launch npx directly can install the package once and configure node with the absolute path to demo.mjs. Client settings differ.

Ask a useful question

What changed in expenses this month? Show the entries.

The synthetic company is Juniper Studio. Its clock is August 31, 2026. “This month” always means August compared with July, regardless of today's date. Expenses rise from USD 1200.0000 to USD 1850.0000, a USD 650.0000 change. Software accounts for 500.0000 and fees for 150.0000. Workspace costs do not change.

Use accountingcontext, expensechanges and ledgerentries. Each category includes stable evidence IDs. trialbalance includes both sides of postings. The fixture uses exact integer arithmetic and returns decimal strings.

Run the working example without a model or external service.

git clone https://github.com/andrewblount/polyaccounts-agent-kit.git
cd polyaccounts-agent-kit
npm run example
npm test

Shortened. The full README is on GitHub.