Databutler Calendar MCP server
online · 100% uptimePublic holidays (UK, US, DE, FR), tax-year dates and DST switches for 2026-2028.
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If you have run it, two minutes of your experience saves the next person an afternoon.
Databutler Calendar tools (2)
write = sends, deletes, buys or postscalendar_factsFreePublic 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): every public holiday of the year with its date and weekday, by region — UK nations (england-and-wales, scotland, northern-ireland; substitute days flagged), US federal (statutory date plus OPM's observed date when it falls on a weekend), German Länder by code or name (nationwide = the nine bundeseinheitlichen Feiertage; partial holidays carry their scope), French metropole or alsace-moselle. kind=tax-year (uk, us, au, in, ca, de, fr, br, pl): the personal tax year's start and end with the periods for 2026–2028 and the statute or official page quoted, plus the government fiscal year where it differs. kind=dst (uk, de, fr, us, au, br): the statutory rule and the computed clocks-forward and clocks-back dates per year, with the states that observe it for Australia and observed:false for Brazil. Country names, UK nations, German Land names (Bavaria, Sachsen) and kind synonyms (bank holidays, financial year, clocks) resolve; no country lists everything covered; unknown countries, regions and years answer covered:false with the nearest matches. Entries that could not be re-verified against an official page carry nonOfficial: true.
next_holidayFreeThe 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 any holiday falling on the date itself; by region as for calendar_facts (UK nations, US federal with OPM's observed date deciding the order, German Länder, French zones). The data runs to the end of 2028; a later date answers covered:false with the last date covered. From the same monthly snapshot of the official lists, with the list's URL as source.
Public scan report
scanner v0.1.10 · 2026-10-14 · same rubric, same numbers if you re-run it
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 99ms20/20
- Tool poisoning2 tool descriptions checked15/15
- Auth qualityopen endpoint, read-only tools10/15
- Maintenancelast push 1 days ago15/15
- Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
How Databutler Calendar compares
Against every graded Productivity MCP server, from our own scans and uptime checks. Updated after each scan run.
- Safety score
- 91/100
- higher than 85% of 1,297 Productivity servers
- Tools
- 2
- the typical Productivity server has 7
- Tools that change things
- 0%
- typical: 0%. Fewer write tools means less an agent can break
- Uptime
- 100%
- of our recent checks; the typical remote Productivity server answers 100%
- Response time
- 40 ms
- faster than 96% of 654 Productivity servers
What its tools let an agent do: 2 read
Install Databutler Calendar in Claude Code, Cursor or VS Code
claude mcp add --transport http databutler-calendar https://databutler.dev/api/mcp/calendar
What the publisher says
From the Databutler Calendar repository's README, as published. We do not edit it. Read it on GitHub
Data Butler (databutler.dev)
An agent honeypot: clean, verified UK public data served to AI agents via MCP and REST. Not an SEO play — no GSC ambitions. The customer is an AI assistant answering a human's question; the product is being the source that is right, with provenance on every number.
Vercel default databutler.vercel.app works, but registry listings must NOT be published until the final domain is live — listings bake in URLs).
- Planned domain: databutler.dev (until purchased/connected, the
MCP serving, domain attached, listed on Smithery (drchriseames/databutler-uk-exams, -uk-rates) and the official MCP Registry (io.github.physics-star-cat/databutler-uk-exams, -uk-rates). Tracking LIVE (GA4 property 552213153, verified in realtime; monitored by webmon 🤖 column). PulseMCP will auto-ingest from the official registry. Front door POST /api/mcp — built 2026-09-01 on branch feat/front-door; listing as io.github.physics-star-cat/databutler / Smithery drchriseames/databutler pending deploy.
- Status: LIVE (launched 2026-08-31): https://databutler.dev — REST +
lowriskquotes.com (Monte Carlo) — full history in ../docs/AUDIT2026-08-30five-sites.md §3b–3e and ../docs/MONETISATION-DECISION.md.
- Born 2026-08-31 out of the agent-API work on whatbreaks.uk (MOT data) and
The model (one brand, many focused servers)
There is no domain authority in MCP registries — discovery is per-listing. So this is NOT one mega-server (tool-list bloat kills those); it is one domain/repo/brand hosting separate, focused MCP endpoints, each listed individually under one namespace, cross-referencing each other:
Front door (2026-09): POST /api/mcp lists the five high-frequency tools directly plus whatchangedsince, coverage, catalogue, call. It is still not a mega-server — everything else stays behind call, capped at 9 listed tools by test. The focused servers remain live and listed.
The roadmap is ordered by (value to an AI agent) × (likelihood we can build it well). It deliberately includes the maintainer-Claude wishlist — this product is designed with Claude as the end user, by Claude:
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
Databutler Calendar: common questions
- Is Databutler Calendar MCP server safe?
- Yes, by our scan: it is graded A (91/100). Read the Databutler Calendar safety report
- How do I install Databutler Calendar?
- It runs remotely at databutler.dev. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does Databutler Calendar need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is Databutler Calendar maintained?
- The last commit was 20 days ago (2026-10-13). The latest release is v1.0.0.
- Is Databutler Calendar up?
- 100% of our last 28 checks got an answer. We check remote servers about four times a day.
- What can I use instead of Databutler Calendar?
- Servers from other publishers that do the same job: Agent-Native Calendar MCP server, Context7 MCP server and AIquila — Nextcloud MCP Server.
- How does Databutler Calendar compare with other Productivity MCP servers?
- safety score 91/100 (higher than 85% of 1,297 Productivity servers); tools 2 (the typical Productivity server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.
Alternatives to Databutler Calendar
Same job from other publishers: the closest match first, then the best rated.
- Agent-Native CalendarAgent-Native Google Calendar - manage events, sync, and public bookingnot reviewedEstablishedA
Context7Up-to-date docs for AI agentsnot reviewedWidely usedA- AIquila — Nextcloud MCP ServerNextcloud MCP server — 345 tools: files, calendar, contacts, mail, Talk, Deck, photos, maps, notesnot reviewedEstablishedC
- Intervals IcuRead/write Intervals.icu MCP server: activities, wellness, calendar, gear, and workouts.not reviewedEstablishedB
- FlutterSDK DocsSearch Wind UI, Magic, Dusk, Telescope and Artisan documentation. Hosted, public, no auth.not reviewedEstablishedA