MCP Money

Instructions

Implementation Reference

• wallet.ts:426-438 (handler)

  The pay method in MCPWallet class that executes the Lightning payment using the underlying NDKCashuWallet's lnPay method. This is the core handler for the 'pay' tool.

  async pay(bolt11: string): Promise<any> {
    if (!this.wallet) throw new Error('Wallet not initialized');
    
    try {
      const result = await this.wallet.lnPay({ pr: bolt11 });
      
      this.saveWallet();
      return result;
    } catch (error) {
      console.error('Error making payment:', error);
      throw error;
    }
  }

• wallet.ts:561-571 (schema)

  Defines the input schema, description, and name for the 'pay' tool, returned in the ListTools response for MCP tool discovery.

  {
    name: 'pay',
    description: 'Pay a Lightning invoice',
    inputSchema: {
      type: 'object',
      properties: {
        bolt11: { type: 'string', description: 'Lightning invoice to pay' }
      },
      required: ['bolt11']
    }
  },

• wallet.ts:640-661 (registration)

  Registers and handles the 'pay' tool invocation in the CallToolRequestSchema handler by calling the wallet.pay method and formatting the standardized MCP response.

  case 'pay':
    const { bolt11 } = args;
    if (!bolt11) {
      throw new Error('bolt11 invoice is required');
    }
    const payResult = await this.wallet.pay(bolt11);
    
    if (payResult && payResult.success !== false) {
      return { 
        content: [{ type: 'text', text: 'Payment successful' }],
        success: true,
        bolt11,
        payResult
      };
    } else {
      return { 
        content: [{ type: 'text', text: 'Payment failed' }],
        success: false,
        bolt11,
        payResult
      };
    }