Developer docs

Lucius MCP Server

Connect AI agents to your Lucius financial data with one URL. OAuth 2.1 login — no API keys to copy. Read-only access to analytics, reports, transactions, invoices, and ledger.

Claude Code

claude mcp add --transport http lucius https://api.lucius.finance/mcp

Run the command, then complete the browser login when prompted.

Cursor

Add to your project .cursor/mcp.json:

{
  "mcpServers": {
    "lucius": {
      "url": "https://api.lucius.finance/mcp",
      "transport": "http"
    }
  }
}

Or open Cursor Settings → MCP → Add server and paste https://api.lucius.finance/mcp.

Codex / Claude Desktop

{
  "mcpServers": {
    "lucius": {
      "type": "http",
      "url": "https://api.lucius.finance/mcp"
    }
  }
}

Example prompts

• “What was our burn last quarter and what's our runway?”
• “Top 10 expenses this year?”
• “Which invoices are overdue and by how much?”
• “Generate a Q1 P&L summary and explain the drivers.”
• “How much did we spend on payroll vs last quarter?”

Security

• Read-only — no mutations via MCP in v1
• OAuth PKCE — tokens scoped to one entity
• Revoke anytime in Settings → Connected Agents