How to Use the ISS Calculator MCP in Vercel AI SDK

Stream live municipal tax calculations directly into your React or Next.js frontend using the Vercel AI SDK.

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Works with every AI agent you already use

…and any MCP-compatible client

MCP Servers — Included with Plan

Connect ISS Calculator MCP to Vercel AI SDK

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

GDPR Included with Plan

Setup ISS Calculator with Vercel AI SDK

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Stream Municipal Rates to Next.js

Your AI client pulls the exact percentage for any local jurisdiction using `get_applicable_rate` while the user watches. Fetching local tax rules usually means staring at a loading spinner. The Vercel AI SDK streams this data right into your UI components. You build interfaces where financial data appears instantly.

Live Withholding Rules via MCP

Calling `check_withholding_status` tells your frontend whether the provider or the client must hold the cash back. It's tough to know who pays the tax based on local laws alone. That result pipes straight into your Svelte or Vue application. No backend polling required.

Final Tax Math in Real Time

Your agent executes `calculate_tax_liability` to crunch the final numbers based on the previous rate and withholding checks. Getting the actual dollar amount right is the whole point of the integration. Vinkius manages the MCP connection so you just handle the Vercel AI SDK stream. You get a live tax breakdown rendered directly to the user.

Setup guide

Set up ISS Calculator MCP in Vercel AI SDK

Prerequisites

Node.js 18+ and a TypeScript project
ai + @modelcontextprotocol/sdk packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies

Run npm install ai @modelcontextprotocol/sdk plus your preferred model provider (e.g. @ai-sdk/openai).
2

Create the Streamable HTTP transport

Use StreamableHTTPClientTransport with your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and use tools

Call mcpClient.tools() to auto-discover all ISS Calculator tools. Pass them directly to generateText() or streamText() — no manual schema definitions needed.
4

Works with any model provider

Swap openai("gpt-4o") for any AI SDK provider — Anthropic, Google, Mistral. The MCP tools work identically across all supported models.

index.ts

import { experimental_createMCPClient as createMCPClient } from "ai";
import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp";
import { generateText } from "ai";
import { openai } from "@ai-sdk/openai";

const transport = new StreamableHTTPClientTransport(
  new URL("https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")
);

const mcpClient = await createMCPClient({ transport });
const tools = await mcpClient.tools();

const { text } = await generateText({
  model: openai("gpt-4o"),
  tools,
  prompt: "List recent ISS Calculator transactions",
});

console.log(text);
await mcpClient.close();

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