io.github.physics-star-cat/databutler-calendar
https://databutler.dev/api/mcp/calendarPublic holidays (UK, US, DE, FR), tax-year dates and DST switches for 2026-2028.
What we measured
Over the last 30 days we probed this MCP server 30 times on 30 days; it answered 30 (100%). Median response 165 ms, 95th percentile 256 ms.
When we called tools/list it returned 2 tools, including calendar_facts, next_holiday, over MCP protocol revision 2026-07-28.
Among the 53,642 reachable MCP servers in our snapshot of 2026-11-13 01:12 UTC, it is faster than 87% and higher on readiness than 31%.
From agent-tools.cloud's own probes, last checked 2026-11-12. How we measure
Tools (2)
As returned by the server's own tools/list when we called it.
- calendar_facts
- Public holidays, tax-year dates or daylight-saving switches for one country in 2026–2028, from the official lists and statutes. kind=holidays (uk, us, de, fr):…
- next_holiday
- The next public holiday strictly after a date (default: today) for uk, us, de, fr, with its name, date, weekday and days until it, the three that follow, and an…
MCP readiness
Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. For x402 and A2A listings it contributes up to 15 of the 100 quality points; for MCP listings it is shown for reference only. Search order and leaderboards use the separate quality grade (here C+, 64.1/100), which weighs availability, conformance, p95 speed and descriptor. How the two differ
| Valid MCP handshake | 0/10 | Handshake needs credentials (HTTP 403); not readable anonymously. |
| Live MCP endpoint | 15/25 | Endpoint requires authentication or payment (239 ms). |
| Protocol revision | 10/10 | Speaks the current MCP revision 2026-07-28. |
| Signed descriptor | n/a | No MCP standard defines a signed server descriptor. |
| Uptime (30 days) | 15/15 | 30/30 probes succeeded over 30 days (100%). |
| Tool declaration | 5/10 | Lists 2 tool(s) with descriptions. |
| Verified identity | 7/10 | Namespace verified by the official MCP Registry (GitHub or DNS proof at publish time). |
| Freshness + modern flags | 0/5 | not seen in a source for over 30 days. |
| Auth declaration | 0/5 | How to authenticate is not stated. |
Compared with peers
Against 53,642 reachable MCP servers in our daily snapshot (2026-11-13 01:12 UTC). Display only; it does not change search order.
- Readiness
- Higher than 31% of peers
- This listing 58 · peer median 81
- Latency
- Faster than 87% of peers
- This listing 120 ms · peer median 349 ms
Where it loses the most points, and how to win them back
- Valid MCP handshake −10
— Complete the MCP handshake without errors.
Now: Handshake needs credentials (HTTP 403); not readable anonymously.
- Live MCP endpoint −10
— Answer initialize and tools/list at the declared endpoint.
Now: Endpoint requires authentication or payment (239 ms).
- Tool declaration −5
— Declare every tool with a description and input schema.
Now: Lists 2 tool(s) with descriptions.
Adoption signals
Public signals from outside this directory, shown for context. They do not change search order or grades.
Listed in
Directories this entry was found in.
How to connect
https://databutler.dev/api/mcp/calendarcurl -X POST https://databutler.dev/api/mcp/calendar \
-H 'Content-Type: application/json' \
-H 'Accept: application/json, text/event-stream' \
-d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}'