com.modernmustardseed/holiday-calendar
Holiday Calendar
U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.
alive probed 2026-10-13 · HTTP 200
5tools
1.4ktokens in Claude Opus 5.5
1.5ktokens in Claude Code
0.7 %of a 200k context window
922o200k_base estimate
2.2 sto initialize
111 msto list tools
- Endpoint
- https://starter.modernmustardseed.com/holidays (streamable-http)
- Host
- starter.modernmustardseed.com
- Protocol
- 2025-11-25
- Reports itself as
- Holiday Calendar (example) by Modern Mustard Seed 1.0.0
- Capabilities
- tools
- Instructions
- 409 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-12. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/ModernMustardSeed/small-business-mcp-starter
- Website
- https://starter.modernmustardseed.com/docs/holidays
- Registry
- active, updated 2026-10-12 · registry entry
- Reachable
- 2 of the last 2 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| add_business_days | 241 | 26 % |
| count_business_days | 203 | 22 % |
| next_federal_holidays | 182 | 20 % |
| list_federal_holidays | 168 | 18 % |
| check_business_day | 128 | 14 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-13 11:07 | alive | 559 ms | 5 | 1.4k | 922 |
| 2026-10-12 11:30 | alive | 2.2 s | 5 | 1.4k | 922 |
Badge and feed
[](https://mcpcost.ulehla.dev/s/com.modernmustardseed/holiday-calendar)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.