How to Use the GSA Per Diem Rates MCP in Vercel AI SDK

Q: What happens if a ZIP code is not found in the database?

Your agent should first call getzipmapping to resolve the location. If that returns nothing, the agent can fall back to getratesbystate or use the standard continental US rates via getconuslodging.

Get live federal travel rates directly in your Vercel AI SDK frontend without loading spinners.

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Connect GSA Per Diem Rates MCP to Vercel AI SDK

Create your Vinkius account to connect GSA Per Diem Rates to Vercel AI SDK and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup GSA Per Diem Rates with Vercel AI SDK

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Stream GSA Per Diem Rates to Vercel AI SDK frontends

This GSA Per Diem Rates MCP Server streams lodging limits directly into your Vercel AI SDK client. You pass the target location to `get_rates_by_zip` or `get_rates_by_city` and watch the numbers render instantly. No more spinners or layout shifts. The SDK grabs the exact federal allowance for the travel year, keeping your UI fast. If the user only has a ZIP code, the `get_zip_mapping` tool maps it to the right city definition before pulling the rates.

Calculate meal breakdowns on the edge

The `get_mie_breakdown` tool provides the exact meal and incidental expense limits for your serverless application. Travel claims require separating breakfast, lunch, and dinner costs, which can slow down your frontend if done manually. This tool returns the exact breakdown for the specified fiscal year. Because this runs on Vercel's edge network, your AI agent processes the financial calculations closer to the user with minimal latency.

State-wide rate lookups for regional planning

The `get_rates_by_state` tool retrieves per diem rates for every county and city within a specified state. When planning multi-stop regional trips, looking up rates one by one slows down your agent. You can also fall back to standard `get_conus_lodging` rates if a specific municipality is not listed. This MCP Server ensures your application never returns empty fields when a user travels to an unlisted rural destination.

Setup guide

Set up GSA Per Diem Rates 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 GSA Per Diem Rates 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 GSA Per Diem Rates transactions",
});

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

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Common questions about GSA Per Diem Rates MCP in Vercel AI SDK

The SDK queries the server in real-time to fetch the latest rates. It uses the `get_rates_by_zip` tool to pull current lodging limits directly from the official database, ensuring your application always displays active federal travel figures.

Yes. The server is fully compatible with Vercel Edge Functions. Your agent calls `get_mie_breakdown` to split meal allowances instantly, keeping your serverless execution fast and within limits.

Vinkius handles the underlying endpoint token authentication. Your Vercel AI SDK client needs just one endpoint token to connect to this MCP Server and securely access all six rate-lookup tools.

Your agent should first call `get_zip_mapping` to resolve the location. If that returns nothing, the agent can fall back to `get_rates_by_state` or use the standard continental US rates via `get_conus_lodging`.

This server only processes location queries like ZIP codes, city names, state codes, and travel years. No personally identifiable travel itineraries or employee names are ever sent to or stored by the GSA Per Diem Rates server.

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