How to Use the Holiday API MCP in Claude

Q: How do I install the Holiday API in Claude Desktop?

Edit your claudedesktopconfig.json file. Add the MCP Server command and arguments, then fully restart the app.

Q: Does Holiday API in Claude Desktop calculate forward delivery dates?

It does. The agent runs getnextworkday to project exact SLA deadlines while skipping local public holidays.

Calculate global workdays and pull federal holiday data directly into Claude Desktop or Claude Web.

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Connect Holiday API MCP to Claude Desktop

Create your Vinkius account to connect Holiday 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 Holiday API with Claude Desktop

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Calculate SLAs in Claude Desktop

`get_workdays_count` is the engine here. You drop two dates into your Claude chat, and the agent calculates the exact number of business days between them. It strips out weekends and localized public holidays automatically. If you need to project a delivery date, `get_next_workday` handles the forward math. Tell your AI client you need a deadline 15 business days from now in France, and it returns the exact date without you opening a calendar app.

Audit Global Holiday Calendars

`get_holidays` pulls the full list of public and federal holidays for any given year and region. You ask Claude to map out the Q4 schedule for your German engineering team, and it outputs the exact dates they will be offline. This prevents scheduling disasters across distributed teams. The agent checks the regional dates against your project timeline, ensuring you don't book a critical launch on a bank holiday.

Verify Regional Support Context

`list_supported_countries` feeds Claude the exact ISO codes it needs to query the right regional databases. Your agent checks this registry first so it never guesses a country code when running date math. For teams communicating across borders, `list_supported_languages` ensures the holiday names return in the correct local format. Claude uses this to draft localized out-of-office policies or HR updates perfectly.

Setup guide

Set up Holiday 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 Holiday 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 Holiday 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 holiday-api-mcp.

json

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

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Holiday API. 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 Holiday API MCP in Claude Desktop

Edit your claude_desktop_config.json file. Add the MCP Server command and arguments, then fully restart the app.

Yes, if the server is hosted remotely. Go to Settings, click Integrations, and paste the custom connector URL.

It does. The agent runs get_next_workday to project exact SLA deadlines while skipping local public holidays.

The agent might be using the wrong country code. Tell it to run list_supported_countries to pull the valid ISO identifiers.

This MCP integration only processes date strings and region codes. It reads public calendar data and never touches your internal HR files or employee PII.

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