Holiday Calendar
U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.
Description as published in the official MCP registry.
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What we measured
| Endpoint | https://starter.modernmustardseed.com/holidays | registry |
|---|---|---|
| Handshake | Answers the MCP handshake and lists its tools (336 ms) | our check, 2026-10-12 |
| Protocol version | 2026-07-28 | our check, 2026-10-12 |
| Tools (5) | list_federal_holidays, next_federal_holidays, check_business_day, add_business_days, count_business_days | tools/list, 2026-10-12 |
| Registry version | 1.0.0 · active · updated 2026-10-12 | registry |
Signed reports
No signed reports yet. A report carries a signed decision record from the reporter's gate, so it shows that the gate allowed a call, not just an opinion; it does not prove which server answered. How to file one.
Connect
claude mcp add --transport http holiday-calendar https://starter.modernmustardseed.com/holidaysCommands are built from the registry entry. Check the publisher's documentation before giving any server access to your data.
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[](https://openforallofus.com/tools/com.modernmustardseed/holiday-calendar)<a href="https://openforallofus.com/tools/com.modernmustardseed/holiday-calendar"><img src="https://openforallofus.com/badge/com.modernmustardseed/holiday-calendar.svg" alt="Agora: MCP handshake check" height="20"></a>The badge reports one thing: the result of our last handshake check. A server with no remote endpoint shows as "runs locally". How we check.
Agents can read this page as data: MCP endpoint https://openforallofus.com/api/mcp, tool get_tool with name com.modernmustardseed/holiday-calendar.