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 LangChain 5 tools — connect in under 2 minutes

Name: Holiday API
Availability: InStock
Author: Vinkius

python.langchain.com/docs/integrations/tools/mcp

Built by Vinkius GDPR 5 Tools Framework

LangChain is the leading Python framework for composable LLM applications. Connect Holiday API through Vinkius and LangChain agents can call every tool natively. combine them with retrievers, memory, and output parsers for sophisticated AI pipelines.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

import asyncio
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent

async def main():
    # Your Vinkius token. get it at cloud.vinkius.com
    async with MultiServerMCPClient({
        "holiday-api": {
            "transport": "streamable_http",
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
        }
    }) as client:
        tools = client.get_tools()
        agent = create_react_agent(
            ChatOpenAI(model="gpt-4o"),
            tools,
        )
        response = await agent.ainvoke({
            "messages": [{
                "role": "user",
                "content": "Using Holiday API, show me what tools are available.",
            }]
        })
        print(response["messages"][-1].content)

asyncio.run(main())

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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.

LangChain's ecosystem of 500+ components combines seamlessly with Holiday API through native MCP adapters. Connect 5 tools via Vinkius and use ReAct agents, Plan-and-Execute strategies, or custom agent architectures. with LangSmith tracing giving full visibility into every tool call, latency, and token cost.

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 LangChain 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 LangChain via MCP

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

Install dependencies

Run pip install langchain langchain-mcp-adapters langgraph langchain-openai

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Run the agent

Save the code and run python agent.py

Explore tools

The agent discovers 5 tools from Holiday API via MCP

Why Use LangChain with the Holiday API MCP Server

LangChain provides unique advantages when paired with Holiday API through the Model Context Protocol.

The largest ecosystem of integrations, chains, and agents. combine Holiday API MCP tools with 500+ LangChain components

Agent architecture supports ReAct, Plan-and-Execute, and custom strategies with full MCP tool access at every step

LangSmith tracing gives you complete visibility into tool calls, latencies, and token usage for production debugging

Memory and conversation persistence let agents maintain context across Holiday API queries for multi-turn workflows

Holiday API + LangChain Use Cases

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

RAG with live data: combine Holiday API tool results with vector store retrievals for answers grounded in both real-time and historical data

Autonomous research agents: LangChain agents query Holiday API, synthesize findings, and generate comprehensive research reports

Multi-tool orchestration: chain Holiday API tools with web scrapers, databases, and calculators in a single agent run

Production monitoring: use LangSmith to trace every Holiday API tool call, measure latency, and optimize your agent's performance

Holiday API MCP Tools for LangChain (5)

These 5 tools become available when you connect Holiday API to LangChain 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 LangChain

Ready-to-use prompts you can give your LangChain 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 LangChain

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

MultiServerMCPClient not found

Install: pip install langchain-mcp-adapters

Holiday API + LangChain FAQ

Common questions about integrating Holiday API MCP Server with LangChain.

How does LangChain connect to MCP servers?

Use langchain-mcp-adapters to create an MCP client. LangChain discovers all tools and wraps them as native LangChain tools compatible with any agent type.

Which LangChain agent types work with MCP?

All agent types including ReAct, OpenAI Functions, and custom agents work with MCP tools. The tools appear as standard LangChain tools after the adapter wraps them.