UK Business Calendar MCP
REMOTE · UK-BUSINESS-CALENDAR-MCP.DONNIERTF.WORKERS.DEV
UK working days, bank holidays, HMRC and Companies House deadlines.
Available components
Last scanned (21 hours ago)
Scores higher than 43% of remote servers
Reachable. Last reached 4 Nov 2026.
Category Finance and Payments
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security46
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 10 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS check failed: the endpoint is reachable over plaintext HTTP. See how to fix → View diagnostics → Fail
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability63
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 909 tokens (~90/item across 10 items; 10 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management20
- Stability observed for 6 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage80
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 39% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 10 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 11 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities40
- Spec-recency check failed: implements MCP spec 2025-03-26; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 4 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.
- 2 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.
- 31 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 30 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- 29 Oct 26 54
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 4 Nov 2026 · Probed https://uk-business-calendar-mcp.donniertf.workers.dev/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=donniertf.workers.dev | CN=YE1,O=Let's Encrypt,C=US | 29 Sept 2026 | 28 Dec 2026 | ECDSA 256 | ECDSA-SHA384 | 6a1bb006acb01c148e87d8ef3f347e1c41a |
| SANs: *.donniertf.workers.dev, donniertf.workers.dev | ||||||
| CN=YE1,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 5ddd70dd31f801c85c186a7a04b80afe |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of uk-business-calendar-mcp.donniertf.workers.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| workers.dev. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://uk-business-calendar-mcp.donniertf.workers.dev/mcp | Verified | 200 | |
| http (plaintext) | http://uk-business-calendar-mcp.donniertf.workers.dev/mcp | Served over HTTP | 200 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
due_date ~105
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.
| Name | Type | Req | Description |
|---|---|---|---|
| access_token | string | – | Subscriber token from /success (or Authorization: Bearer) |
| days | number | yes | – |
| from | string | – | – |
| region | string | – | england (default), wales, scotland, northern-ireland |
| working | boolean | – | – |
No output schema declared.
No examples provided.
facts_search ~70
PRO ($0.01). Wikipedia search for background facts: up to 10 matching articles with snippets, and summaries for the top 3.
| Name | Type | Req | Description |
|---|---|---|---|
| access_token | string | – | Subscriber token from /success (or Authorization: Bearer) |
| max | number | – | – |
| query | string | yes | – |
No output schema declared.
No examples provided.
month_planner ~87
PRO. For a month: working days count, bank holidays, payday suggestions (last working day / 25th rolled back) and deadlines.
| Name | Type | Req | Description |
|---|---|---|---|
| access_token | string | – | Subscriber token from /success (or Authorization: Bearer) |
| month | string | yes | YYYY-MM |
| region | string | – | england (default), wales, scotland, northern-ireland |
No output schema declared.
No examples provided.
news_briefing ~85
PRO ($0.01). One-call briefing on a company or topic: latest GDELT news (optionally UK outlets only), Hacker News discussion and Wikipedia background.
| Name | Type | Req | Description |
|---|---|---|---|
| access_token | string | – | Subscriber token from /success (or Authorization: Bearer) |
| days | number | – | – |
| query | string | yes | – |
| uk_only | boolean | – | – |
No output schema declared.
No examples provided.
news_quick ~49
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.
| Name | Type | Req | Description |
|---|---|---|---|
| query | string | yes | – |
No output schema declared.
No examples provided.
news_search ~135
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).
| Name | Type | Req | Description |
|---|---|---|---|
| access_token | string | – | Subscriber token from /success (or Authorization: Bearer) |
| days | number | – | – |
| lang | string | – | – |
| max | number | – | – |
| query | string | yes | – |
| uk_only | boolean | – | – |
No output schema declared.
No examples provided.
next_bank_holidays ~51
FREE. Next 3 UK bank holidays for a nation, plus whether today is a working day.
| Name | Type | Req | Description |
|---|---|---|---|
| region | string | – | england (default), wales, scotland, northern-ireland |
No output schema declared.
No examples provided.
tax_deadlines ~76
PRO. Upcoming HMRC and Companies House deadlines for the next N months; add company_year_end for Corporation Tax, CT600 and accounts dates.
| Name | Type | Req | Description |
|---|---|---|---|
| access_token | string | – | Subscriber token from /success (or Authorization: Bearer) |
| company_year_end | string | – | YYYY-MM-DD |
| months | number | – | – |
No output schema declared.
No examples provided.
tech_news_search ~120
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).
| Name | Type | Req | Description |
|---|---|---|---|
| access_token | string | – | Subscriber token from /success (or Authorization: Bearer) |
| days | number | – | – |
| max | number | – | – |
| min_points | number | – | – |
| query | string | yes | – |
| sort | string | – | – |
No output schema declared.
No examples provided.
working_days ~82
PRO. Count UK working days between two dates (excludes weekends + bank holidays for the nation).
| Name | Type | Req | Description |
|---|---|---|---|
| access_token | string | – | Subscriber token from /success (or Authorization: Bearer) |
| from | string | yes | – |
| region | string | – | england (default), wales, scotland, northern-ireland |
| to | string | yes | – |
No output schema declared.
No examples provided.
How do I install the UK Business Calendar MCP server?
UK Business Calendar MCP is a hosted endpoint at https://uk-business-calendar-mcp.donniertf.workers.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · uk-business-calendar-mcp.donniertf.workers.dev
claude mcp add --transport http donniertf-hub-uk-business-calendar-mcp 'https://uk-business-calendar-mcp.donniertf.workers.dev/mcp'
What is the UK Business Calendar MCP server?
UK Business Calendar MCP is listed in the public MCP registry as io.github.donniertf-hub/uk-business-calendar-mcp. UK working days, bank holidays, HMRC and Companies House deadlines. This page covers its hosted endpoint (https://uk-business-calendar-mcp.donniertf.workers.dev/mcp).
Is the UK Business Calendar MCP server safe to use?
UK Business Calendar MCP scores 57 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the UK Business Calendar MCP server expose?
UK Business Calendar MCP exposes 10 tools: next_bank_holidays, working_days, due_date, tax_deadlines, month_planner, and 5 more. Their descriptions and schemas cost roughly 860 tokens of context every time the server is loaded.
Does the UK Business Calendar MCP server require authentication?
No. We connected to UK Business Calendar MCP without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the UK Business Calendar MCP server still maintained?
UK Business Calendar MCP is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.