How to Use the ISS Calculator MCP in Mastra AI

Build resilient tax calculation workflows with automatic retries using the ISS Calculator and Mastra AI.

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Works with every AI agent you already use

…and any MCP-compatible client

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Connect ISS Calculator MCP to Mastra AI

Create your Vinkius account to connect ISS Calculator to Mastra AI — we handle the hosting, security, and runtime updates so you don't have to. No server setup required.

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Setup ISS Calculator with Mastra AI

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Conditional Tax Logic with Mastra AI

You can pull the exact percentage for a specific service using `get_applicable_rate` inside a Mastra workflow. Municipal tax codes change constantly. If the local government API times out, the framework automatically retries with exponential backoff. Your billing system never fails just because a city database went offline.

Branching Based on Withholding

Running `check_withholding_status` determines exactly who owes the money for a given transaction. Sometimes the buyer pays the tax instead of the seller. This triggers different branches in your workflow. Your agent routes the invoice to the client if they owe the tax, or deducts it from the payout if the provider is responsible.

Reliable Financial Math via MCP

Your workflow executes `calculate_tax_liability` to output the final dollar amount owed to the municipality. Hitting the exact final number requires precision. Vinkius handles the underlying MCP infrastructure. You just deploy the Mastra agent to your cloud and let it crunch the numbers.

Setup guide

Set up ISS Calculator MCP in Mastra AI

Prerequisites

Node.js 18+ and a TypeScript project
@mastra/mcp + @mastra/core packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run npm install @mastra/mcp @mastra/core plus your preferred model provider (e.g. @ai-sdk/openai).
2

Configure the MCPClient
Create an MCPClient with your Vinkius endpoint as a URL object. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and inject tools
Call mcpClient.listTools() and spread the result into your agent's tools object. All ISS Calculator tools become native Mastra tools.
4

Run with any model
Swap openai("gpt-4o") for any AI SDK-compatible provider. Call agent.generate() and the agent routes tool calls through MCP automatically.

agent.ts

import { MCPClient } from "@mastra/mcp";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const mcpClient = new MCPClient({
  id: "iss-calculator-mcp-client",
  servers: {
    "iss-calculator-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

const agent = new Agent({
  name: "ISS Calculator Agent",
  model: openai("gpt-4o"),
  instructions: "You have access to ISS Calculator tools.",
  tools: {
    ...(await mcpClient.listTools()),
  },
});

const result = await agent.generate(
  "List recent ISS Calculator transactions"
);
console.log(result.text);

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by ISS Calculator. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

Why Choose Vinkius

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Common questions about ISS Calculator MCP in Mastra AI

Initialize a new MCPClient with the Vinkius URL. Call mcpClient.listTools() and spread those tools into your Mastra agent configuration.

You can enable requireToolApproval for any tax calculation. A human accountant reviews the municipal rate before the workflow continues.

The framework catches the error and applies exponential backoff. It retries the local tax lookup automatically based on your workflow settings.

The client auto-detects the transport protocol. It connects to the Vinkius endpoint using Streamable HTTP or SSE automatically.

Service codes, municipal locations, and billing amounts stay encrypted in transit. Vinkius processes the tax math without retaining your specific financial records.

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