Tutorial12 min read

How to connect Claude to your internal APIs using MCP

The younifyd team

July 4, 2026 · younifyd.com

Claude can call external tools during a conversation — searching the web, running code, reading files. With MCP, you can give Claude access to your internal APIs too: your product catalogue, your customer database, your order management system. This tutorial walks through the full setup using younifyd as the MCP server.

Step 1: Build your API workflow in younifyd

Start by creating a workflow that exposes the data you want Claude to access. In this example, we'll build a product lookup that fetches product details, pricing, and inventory. Each route becomes a candidate MCP tool — so design your routes around the actions you want Claude to perform, not the structure of your internal services.

# routes to expose as MCP tools
GET  /products/:id       → get_product
GET  /products/search    → search_products
GET  /orders/:id         → get_order
POST /orders             → create_order

Step 2: Enable MCP on each route

In the younifyd route settings, toggle "Expose as MCP tool". younifyd generates a tool schema from your route's input/output shape. Review the generated description and refine it — Claude uses the description to decide when to call the tool, so clear descriptions produce better agent behaviour.

Step 3: Get your MCP server URL and token

younifyd generates a unique MCP server URL for your workspace. Generate an MCP access token with the scopes matching the tools you've enabled. Keep the token scoped to only the tools you want Claude to access — don't reuse your full API key.

# younifyd MCP server details
server_url: https://mcp.younifyd.com/ws/acme-corp
token: yt_mcp_xxxxxxxxxxxxxxxx
scopes: [get_product, search_products, get_order]

Step 4: Add the MCP server to Claude

In Claude Desktop, open Settings → Developer → MCP Servers. Add a new server with the URL and token from younifyd. Claude will discover the available tools automatically — you'll see them listed in the tool panel. Now when you ask Claude about a product, it will call your API and use the real data in its response.

# claude_desktop_config.json
{
  "mcpServers": {
    "younifyd": {
      "url": "https://mcp.younifyd.com/ws/acme-corp",
      "token": "yt_mcp_xxxxxxxxxxxxxxxx"
    }
  }
}

What you get with every tool call

Every call Claude makes to your MCP tools is logged in the younifyd execution timeline — which tool was called, with what arguments, how long it took, and what was returned. You can see exactly how Claude is using your APIs, set per-tool rate limits to control costs, and use the logs to improve your tool descriptions based on how Claude actually calls them.

Connect Claude to your APIs

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