list_countries — Every country the public holiday API covers, with its two-letter code.
country_info — Official name, region and land borders for a country.
get_holidays — All public holidays for a country and year, with local and English names.
next_holidays — The next public holidays for a country, starting from today.
worldwide_holidays — The next public holidays around the world - useful for planning around other countries' closures.
long_weekends — Long weekends in a country and year, and whether a bridge day off is needed to get them.
is_today_holiday — Whether today is a public holiday in a country.
regional_holidays — Holidays that actually apply in one subdivision (US-CA, DE-BE, CA-ON): national days plus local ones.
holiday_on_date — Is one specific date a public holiday? Answers yes or no, with the previous and next holiday.
compare_countries — Shared, and country-specific, public holidays for two countries in one year.

Setup

No setup. Holiday data comes from the public Nager.Date API.

Part of awesome-mcps.

Premium tools

These tools need a license key:

working_day_calendar
holiday_observance_audit

Buy a key at https://mcp-marketplace.io/server/io-github-mrfentmen-nager-mcp and set it in your MCP client config:

"env": { "MCP_LICENSE_KEY": "mcp_live_..." }

The key is checked against MCP Marketplace, cached for 24 hours, and keeps working offline once one check has succeeded. Every other tool on this server stays free.