How do I find my Holiday API Key?

Log in to your [**Holiday API dashboard**](https://holidayapi.com/dashboard), and you will find your API Key on the main page. Copy and paste it below.

Does the agent support historical years?

Yes. Holiday API provides historical data. Depending on your plan, you can query holidays for past years to audit previous events.

Can the agent calculate the number of workdays?

Yes. The `get_workdays_count` tool allows your agent to calculate the exact number of non-holiday business days between two dates for any country.

Holiday API MCP Server for Claude Desktop 5 tools — connect in under 2 minutes

Name: Holiday API
Availability: InStock
Author: Vinkius

modelcontextprotocol.io/quickstart/user

Built by Vinkius GDPR 5 Tools IDE

Claude Desktop is Anthropic's native application for interacting with Claude AI models on macOS and Windows. It was the first consumer application to ship with built-in MCP support, making it the reference implementation for the Model Context Protocol standard.

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Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

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Vinkius Desktop App

The modern way to manage MCP Servers — no config files, no terminal commands. Install Holiday API and 2,500+ MCP Servers from a single visual interface.

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Classic Setup·json

{
  "mcpServers": {
    "holiday-api": {
      // Your Vinkius token. get it at cloud.vinkius.com
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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DLPData protection

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Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Holiday API MCP Server

Empower your AI agent to orchestrate your entire global event and holiday research workflow with Holiday API, the reliable source for holiday data. By connecting Holiday API to your agent, you transform complex calendar auditing into a natural conversation. Your agent can instantly retrieve public holidays for any country, audit workday counts, and identify supported languages without you ever touching a manual calendar. Whether you are planning international logistics or managing global payroll, your agent acts as a real-time event consultant, ensuring your schedules are always accurate and compliant.

Claude Desktop is the definitive way to connect Holiday API to your AI workflow. Add Vinkius Edge URL to your config, restart the app, and Claude immediately exposes all 5 tools in the chat interface. ask a question, Claude calls the right tool, and you see the answer. Zero code, zero context switching.

What you can do

Holiday Auditing — Retrieve public and federal holidays for over 200 countries and retrieve detailed metadata, including names and dates.
Workday Oversight — Calculate the next workday or count workdays between two dates to maintain a clear view of operational periods.
Global Discovery — List all supported countries and languages in the Holiday API catalog to identify regional event markers.
Temporal Intelligence — Query holidays for specific years to audit past and future global events instantly.
Usage Monitoring — Get real-time API usage and status metadata to maintain strict control over your research volume.

The Holiday API MCP Server exposes 5 tools through the Vinkius. Connect it to Claude Desktop in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Holiday API to Claude Desktop via MCP

Follow these steps to integrate the Holiday API MCP Server with Claude Desktop.

Open Claude Desktop Settings

Go to Settings → Developer → Edit Config to open claude_desktop_config.json

Add the MCP Server

Paste the configuration above into the mcpServers section

Restart Claude Desktop

Close and reopen Claude Desktop to load the new server

Start using Holiday API

Look for the 🔌 icon in the chat. your 5 tools are now available

Why Use Claude Desktop with the Holiday API MCP Server

Claude Desktop by Anthropic provides unique advantages when paired with Holiday API through the Model Context Protocol.

Claude Desktop is the reference MCP client. it was designed alongside the protocol itself, ensuring the most complete and stable MCP implementation available

Zero-code configuration: add a server URL to a JSON file and Claude instantly discovers and exposes all available tools in the chat interface

Claude's extended thinking capability lets it reason through multi-step tool usage, chaining multiple API calls to answer complex questions

Enterprise-grade security with local config storage. your tokens never leave your machine, and connections go directly to Vinkius Edge network

Holiday API + Claude Desktop Use Cases

Practical scenarios where Claude Desktop combined with the Holiday API MCP Server delivers measurable value.

Interactive data exploration: ask Claude to query DNS records, look up WHOIS data, and cross-reference results in a single conversation

Ad-hoc security audits: type a domain name and let Claude enumerate subdomains, check DNS history, and flag configuration anomalies. all through natural language

Executive briefings: generate comprehensive domain intelligence reports by asking Claude to compile findings into a formatted summary

Learning and training: new team members can explore API capabilities conversationally without needing to read documentation

Holiday API MCP Tools for Claude Desktop (5)

These 5 tools become available when you connect Holiday API to Claude Desktop via MCP:

get_holidays

Get public holidays for a country and year

get_next_workday

Get the date after a number of workdays from a start date

get_workdays_count

Count the number of workdays between two dates

list_supported_countries

List all countries supported by Holiday API

list_supported_languages

List all languages supported by Holiday API

Example Prompts for Holiday API in Claude Desktop

Ready-to-use prompts you can give your Claude Desktop agent to start working with Holiday API immediately.

"What are the public holidays in 'US' for 2024 using Holiday API?"

"Calculate the next 10 workdays from 2024-01-01 in Brazil."

"List all countries supported by Holiday API."

Troubleshooting Holiday API MCP Server with Claude Desktop

Common issues when connecting Holiday API to Claude Desktop through the Vinkius, and how to resolve them.

Server not appearing after restart

Ensure the JSON is valid (no trailing commas). Check the file path: ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\\Claude\\ (Windows).

Authentication error

Verify your Vinkius token is correct. Go to cloud.vinkius.com to regenerate it if needed.

Tools not showing in chat

Click the 🔌 icon at the bottom of the chat input. If it shows 0 tools, the server may still be connecting. wait a few seconds.

Holiday API + Claude Desktop FAQ

Common questions about integrating Holiday API MCP Server with Claude Desktop.

How does Claude Desktop discover MCP tools?

When Claude Desktop starts, it reads the claude_desktop_config.json file and connects to each configured MCP server. It calls the tools/list endpoint to fetch the schema for every available tool, then surfaces them as clickable options in the chat interface via the 🔌 icon.

What happens if the MCP server is temporarily unavailable?

Claude Desktop handles disconnections gracefully. if the server is unreachable at startup, the tools simply won't appear. Once the server becomes available again, restarting Claude Desktop will re-establish the connection. There is no timeout penalty or error loop.

Can I connect multiple MCP servers simultaneously?

Yes. You can add as many servers as you need in the mcpServers section of the config file. Each server appears as a separate tool provider, and Claude can use tools from multiple servers in a single conversation turn.

Is there a limit on the number of tools per server?

Claude Desktop can handle hundreds of tools per server. However, for optimal LLM performance, Vinkius servers are designed to expose focused, well-documented tool sets rather than overwhelming the model with too many options.

Does Claude Desktop support Streamable HTTP transport?

Yes. Claude Desktop supports both SSE (Server-Sent Events) and the newer Streamable HTTP transport that Vinkius uses. Simply provide the server URL. Claude auto-negotiates the transport protocol.