How to Use the NAICS/SIC Classification API MCP in Claude

Q: What happens if a lookup fails inside Claude Desktop?

You should run checkapistatus to verify the connection is active. If the service is running, refine your search term to help the classification tools find closer matches.

Look up and audit regulatory industry codes directly inside Claude Desktop using local or remote MCP connections.

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Connect NAICS/SIC Classification API MCP to Claude Desktop

Create your Vinkius account to connect NAICS/SIC Classification API to Claude Desktop 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 NAICS/SIC Classification API with Claude Desktop

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Run instant industry code lookups in Claude Desktop

The `search_naics_codes` tool lets your agent query the North American Industry Classification System database without leaving your desktop chat window. You type a business description, and the tool pulls up-to-date classifications to map your client data inside Claude Desktop. This MCP Server runs locally via stdio or connects remotely to keep your Claude Desktop workspace clean. You avoid manual web searches by letting your agent execute `get_classification_details` to verify corporate tax categories inside Claude Desktop.

Audit legacy SIC codes inside your chat

The `search_sic_codes` tool lets you find legacy Standard Industrial Classification codes directly in Claude Desktop. Your agent compares the old Standard Industrial Classification codes with modern equivalents during your Claude Desktop data cleaning sessions. If you need to verify the API uptime before running a massive batch of lookups, `check_api_status` confirms your Claude Desktop configuration is talking to the classification database properly.

Automate compliance verification with Claude Desktop

The `get_classification_details` tool helps compliance officers verify legal entity classifications during onboarding in Claude Desktop. Your agent pulls exact definitions to ensure your underwriting team uses the correct industry codes. The integration runs inside Claude Desktop so you can drag and drop CSV files of company descriptions directly into the chat. Your agent processes each row, running the classification tools to output a clean list of verified codes.

Setup guide

Set up NAICS/SIC Classification API MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The NAICS/SIC Classification API MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the NAICS/SIC Classification API MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under naicssic-classification-api-mcp.

json

{
  "mcpServers": {
    "naicssic-classification-api-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

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Common questions about NAICS/SIC Classification API MCP in Claude Desktop

Open your Claude Desktop config file and add the server to your list of tools. Once restarted, ask Claude to search for a business category, and it will run the search tools automatically.

Yes. This MCP Server runs as a local subprocess via stdio, meaning Claude Desktop executes the tools on your machine without external dependencies.

You should run `check_api_status` to verify the connection is active. If the service is running, refine your search term to help the classification tools find closer matches.

You can paste a list of companies into the chat window. Claude Desktop will iterate through the list, calling the search tools for each item to classify them one by one.

This server only processes the company descriptions and industry queries you submit during lookups. Claude Desktop handles these requests locally or via your secure endpoint, ensuring your internal audit logs never leak to public directories.

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