How to Use the REST Countries MCP in Mastra AI

Q: How do I register REST Countries tools in a Mastra AI agent?

Instantiate the MCP client using @mastra/mcp and spread the tools into your agent configuration. Your agent can immediately call getallcountries to gather global data.

Q: How does Mastra AI verify country codes with REST Countries?

Your agent uses getcountrybycode within a step function to validate ISO values. If the code is invalid, the workflow routes the error to a correction branch.

Q: Can I use REST Countries to route multi-step Mastra AI workflows?

Yes, you can branch your workflow based on the output of getcountriesbylanguage. This lets your agent run specific sub-workflows depending on the spoken language of the target country.

Build resilient global workflows with Mastra AI and the REST Countries MCP Server.

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Setup REST Countries with Mastra AI

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Resilient regional data fetching with Mastra AI agents

The `get_countries_by_region` tool integrates directly into your Mastra AI workflows, allowing your agents to query specific geographic zones automatically. If the upstream network hesitates, Mastra's built-in retry engine handles backoffs without crashing your pipeline. You can chain this tool with conditional branches to handle errors gracefully. For example, if a regional lookup fails, your workflow can automatically fall back to `get_all_countries` to extract the required data and keep the run alive.

Automated currency and language routing in Mastra AI

Use `get_countries_by_currency` to build complex financial routing agents inside your Mastra AI codebase. Your agents automatically check which countries accept a specific currency before executing cross-border payment rules. By pairing this with `get_countries_by_language`, you can route localized customer support tickets to the correct regional teams. The workflow handles the logic, retries, and human approvals before any final action is taken.

Human-in-the-loop country record validation

The `get_country_by_name` tool allows your Mastra AI agent to look up official country records and present them to an admin for approval. This ensures that critical regional data is verified before it updates your internal systems. You can use `get_country_by_code` to double-check ISO codes against user input, triggering an approval step if a mismatch occurs. Mastra's native workflow engine handles the state transitions and manual steps easily.

Setup guide

Set up REST Countries 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 REST Countries 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: "rest-countries-mcp-client",
  servers: {
    "rest-countries-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

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

const result = await agent.generate(
  "List recent REST Countries 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 REST Countries. 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.

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Common questions about REST Countries MCP in Mastra AI

Instantiate the MCP client using `@mastra/mcp` and spread the tools into your agent configuration. Your agent can immediately call `get_all_countries` to gather global data.

Yes, Mastra AI uses automatic retries with exponential backoff to handle rate limits. If a tool like `get_countries_by_region` hits a limit, the workflow pauses and retries.

Your agent uses `get_country_by_code` within a step function to validate ISO values. If the code is invalid, the workflow routes the error to a correction branch.

Yes, you can branch your workflow based on the output of `get_countries_by_language`. This lets your agent run specific sub-workflows depending on the spoken language of the target country.

Absolutely. All lookups for country records, currency lists, and language codes execute within an ephemeral V8 sandbox via this MCP Server. No search data is cached or written to persistent storage.

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