UK Business Calendar MCP

io.github.donniertf-hub/uk-business-calendar-mcpdonniertf-hubstreamable-httpv1.1.0Scanned 3 hours ago

UK working days, bank holidays, HMRC and Companies House deadlines.

10 tools: 1 do something that can't be undone, 6 change things and 3 only read.

Reads private data · 0
Reads text others write · 0
Can send data out · 1
No findings

Tools listed without sign-in. Remote posture

Anlyon alternative

7 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

10 tools

Can't be undone 1Sends, pays, publishes or merges: once done, it cannot be taken back.Claude Code: ask

working_daysPRO.Can send data outNo findings
Why it is in this group
- The input addresses people (input.to): what it sends cannot be taken back.
What it can reach
- outboundThe input takes a destination (input.to): what the tool writes goes there.
Description, as the server wrote it
PRO. Count UK working days between two dates (excludes weekends + bank holidays for the nation).

Changes things 6Creates or changes something that can be changed back.Claude Code: ask

due_datePRO.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
PRO. Invoice/contract due date: add N working days or N calendar days (rolled to next working day) to a date. Includes Late Payment Act 30-day default.
month_plannerPRO.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
PRO. For a month: working days count, bank holidays, payday suggestions (last working day / 25th rolled back) and deadlines.
news_briefingPRO ($0.01).No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
PRO ($0.01). One-call briefing on a company or topic: latest GDELT news (optionally UK outlets only), Hacker News discussion and Wikipedia background.
news_quickFREE.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
FREE. Quick news & facts lookup for a topic: top Wikipedia matches (with summary) and top Hacker News stories from the last 30 days. No key.
next_bank_holidaysFREE.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
FREE. Next 3 UK bank holidays for a nation, plus whether today is a working day.
tax_deadlinesPRO.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
PRO. Upcoming HMRC and Companies House deadlines for the next N months; add company_year_end for Corporation Tax, CT600 and accounts dates.

Only reads 3Looks things up and changes nothing.Show 3 read-only tools

facts_searchPRO ($0.01).No findings
Why it is in this group
- The name "facts_search" says "search": a word for reading.
Description, as the server wrote it
PRO ($0.01). Wikipedia search for background facts: up to 10 matching articles with snippets, and summaries for the top 3.
news_searchPRO ($0.01).No findings
Why it is in this group
- The name "news_search" says "search": a word for reading.
Description, as the server wrote it
PRO ($0.01). Search worldwide online news (GDELT DOC 2.0, 65+ languages) for a topic: latest articles with headline, URL, outlet domain, time seen and source country. Options: days (1-90, default 7), uk_only, lang (e.g. english), max (≤50).
tech_news_searchPRO ($0.01).No findings
Why it is in this group
- The name "tech_news_search" says "search": a word for reading.
Description, as the server wrote it
PRO ($0.01). Search Hacker News stories (via Algolia) for a company, product or topic: title, link, points, comments. Options: days (default 30), min_points, sort ('relevance' or 'recent'), max (≤30).

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or untrusted-input.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out1: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.; working_days

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Oct 29, 2026, 22:28 UTC, unchanged since Oct 29, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 7
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: not observed
RFC 9728 protected resource metadata: not observed
Authorization servers: not observed
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

HighThe whole server
The endpoint served tools/list without credentials, and the list has 7 tools that change things (1 irreversible, 6 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://uk-business-calendar-mcp.donniertf.workers.dev/mcp: tools/list returned 10 tools to an anonymous client, including working_days (irreversible), next_bank_holidays (write), due_date (write), tax_deadlines (write), month_planner (write) and 2 more
What this check looks for

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http uk-business-calendar https://uk-business-calendar-mcp.donniertf.workers.dev/mcp

claude mcp add --transport http uk-business-calendar https://uk-business-calendar-mcp.donniertf.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__uk-business-calendar__news_search",
      "mcp__uk-business-calendar__tech_news_search",
      "mcp__uk-business-calendar__facts_search"
    ],
    "ask": [
      "mcp__uk-business-calendar__next_bank_holidays",
      "mcp__uk-business-calendar__working_days",
      "mcp__uk-business-calendar__due_date",
      "mcp__uk-business-calendar__tax_deadlines",
      "mcp__uk-business-calendar__month_planner",
      "mcp__uk-business-calendar__news_quick",
      "mcp__uk-business-calendar__news_briefing"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as uk-business-calendar. Review it before you use it.

Capability tags behind 1 rule

mcp__uk-business-calendar__working_days outbound

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/io.github.donniertf-hub/uk-business-calendar-mcp/verify?hash=99fff0b71117fff54fdbf18ea9cf4c544b0e87b80ff4e973be6f86c7db6fde2d" | jq -e '.changed == false'

Pinned hash 99fff0b71117, from Oct 29, 2026, 21:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.donniertf-hub/uk-business-calendar-mcp/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

[![anlyon.dev](https://anlyon.dev/badge/io.github.donniertf-hub/uk-business-calendar-mcp.svg)](https://anlyon.dev/servers/io.github.donniertf-hub/uk-business-calendar-mcp)

Source: MCP Registry · repository. Synced Oct 29, 2026, 22:19 UTC.