UK Companies House MCP
REMOTE · UK-CH-MCP.DONNIERTF.WORKERS.DEV
UK Companies House new companies by postcode and KYB checks. £0.49 new_cos_pack + kyb_pack.
Available components
Last scanned (7 hours ago)
Scores higher than 46% of remote servers
Reachable. Last reached 17 Oct 2026.
Category CRM and Sales
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 4 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 enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement. View diagnostics → Unverified
- 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 Usability79
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 286 tokens (~71/item across 4 items; 4 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management27
- Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 4 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.
- 17 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.
- 14 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
- 12 Oct 26 +42
- Injection markers: unverified → pass ▲ security
- Transport: fail → pass ▲ security
- First check of Judged manipulation: pass security
- Authorization: Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. security
- MCP protocol: unverified → fail ▼ functional
- Tool coverage: unverified → 100 ▲ functional
- Stability: unverified → 0.10 ▲ functional
- First check of Schema quality: fail functional
- First check of Schema quality: excellent functional
- First check of Destructive annotations: pass functional
- First check of Schema quality: pass functional
- First check of Tool coverage: 100 functional
- 10 Oct 26 18
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 17 Oct 2026 · Probed https://uk-ch-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-ch-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-ch-mcp.donniertf.workers.dev/mcp | Verified | 200 | |
| http (plaintext) | http://uk-ch-mcp.donniertf.workers.dev/mcp | Inconclusive | 405 |
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 →
kyb_pack ~96
Paid pack for one UK company number (profile, officers, PSC, filings, indicators). Indicators are not a due-diligence or Know Your Business opinion. Returns Stripe Checkout URL (£0.49). Soft-Offer outbound is OFF.
| Name | Type | Req | Description |
|---|---|---|---|
| company_number | string | yes | UK company number (e.g. 00000006) |
| filing_limit | number | – | Recent filings to include (default 10, max 50) |
No output schema declared.
No examples provided.
new_cos_discover ~77
Free peek: up to 5 newly incorporated UK companies for an area/location (e.g. London). Cached 24h. Soft-Offer outbound is OFF.
| Name | Type | Req | Description |
|---|---|---|---|
| area | string | yes | Area/location string (e.g. London) |
| size | number | – | Max results (default 5, max 5 for free) |
No output schema declared.
No examples provided.
new_cos_pack ~72
Paid pack of newly incorporated UK companies matching an area. Returns Stripe Checkout URL (£0.49) then redeem with one-time token. Soft-Offer outbound is OFF.
| Name | Type | Req | Description |
|---|---|---|---|
| area | string | yes | Area/location string (required) |
| size | number | – | Pack size (default 25, max 100) |
No output schema declared.
No examples provided.
redeem_pack ~41
Instructions to redeem a paid Stripe Checkout session (success redirect). Pass session_id from checkout.
| Name | Type | Req | Description |
|---|---|---|---|
| session_id | string | yes | Stripe Checkout session id (cs_...) |
No output schema declared.
No examples provided.
How do I install the UK Companies House MCP server?
UK Companies House MCP is a hosted endpoint at https://uk-ch-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-ch-mcp.donniertf.workers.dev
claude mcp add --transport http donniertf-hub-uk-ch-mcp 'https://uk-ch-mcp.donniertf.workers.dev/mcp'
What is the UK Companies House MCP server?
UK Companies House MCP is listed in the public MCP registry as io.github.donniertf-hub/uk-ch-mcp. UK Companies House new companies by postcode and KYB checks. £0.49 new_cos_pack + kyb_pack. This page covers its hosted endpoint (https://uk-ch-mcp.donniertf.workers.dev/mcp).
Is the UK Companies House MCP server safe to use?
UK Companies House MCP scores 62 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 Companies House MCP server expose?
UK Companies House MCP exposes 4 tools: new_cos_discover, new_cos_pack, kyb_pack, redeem_pack. Their descriptions and schemas cost roughly 286 tokens of context every time the server is loaded.
Does the UK Companies House MCP server require authentication?
No. We connected to UK Companies House MCP without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the UK Companies House MCP server still maintained?
UK Companies House MCP is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.