io.github.physics-star-cat/databutler-calendar
databutler-calendar
Public holidays (UK, US, DE, FR), tax-year dates and DST switches for 2026-2028.
alive probed 2026-10-05 · HTTP 200
2tools
1.1ktokens in Claude Opus 5.5
1.1ktokens in Claude Code
0.6 %of a 200k context window
723o200k_base estimate
182 msto initialize
178 msto list tools
- Endpoint
- https://databutler.dev/api/mcp/calendar (streamable-http)
- Host
- databutler.dev
- Protocol
- 2025-11-25
- Reports itself as
- databutler-calendar 1.1.0
- Capabilities
- tools
- Instructions
- 954 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-05. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/physics-star-cat/databutler
- Website
- https://databutler.dev/api
- Registry
- active, updated 2026-10-04 · registry entry
- Reachable
- 2 of the last 2 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| calendar_facts | 498 | 69 % |
| next_holiday | 225 | 31 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-05 15:25 | alive | 182 ms | 2 | 1.1k | 723 |
| 2026-10-05 00:43 | alive | 58 ms | 2 | 723 |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.physics-star-cat/databutler-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.