com.modernmustardseed/holiday-calendar

up checked 2026-11-11T10:39:15.841Z

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Publisher-provided title

Holiday Calendar

Publisher-provided description

U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.

Summary by lookupd

Computes U.S. federal holidays, observed dates, and business-day counts or offsets for scheduling and due-date calculations.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http holiday-calendar https://starter.modernmustardseed.com/holidays

Codex, remote (streamable-http)

codex mcp add holiday-calendar --url https://starter.modernmustardseed.com/holidays

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "holiday-calendar": {
      "url": "https://starter.modernmustardseed.com/holidays"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (5 tools)

Publisher-provided text

• list_federal_holidays List the eleven U.S. federal holidays for one calendar year (2021 through 2100): each holiday's name, its actual date and weekday, the date it is observed when
• next_federal_holidays Find the next one to eleven U.S. federal holidays observed on or after a date, with each one's observed date and how many calendar days away it is. Without from
• check_business_day Check whether a date is a U.S. business day (a weekday that is not an observed federal holiday). Returns the weekday, the holiday observed that day if any, and
• add_business_days Move a number of U.S. business days forward or backward from a date, skipping weekends and observed federal holidays, for due dates, delivery windows and notice
• count_business_days Count the U.S. business days between two dates, both dates included, leaving out weekends and observed federal holidays. Returns the business day count, the wee

Details

• Version: 1.0.1
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 268 ms
• First indexed: 2026-11-01T08:55:26.476Z
• Last seen in registry: 2026-11-01T08:55:26.496Z
• Repository: https://github.com/ModernMustardSeed/small-business-mcp-starter
• Website: https://starter.modernmustardseed.com/docs/holidays

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