CitedBy
REMOTE · CITEDBY.EU
Check a page, AI-crawler access, llms.txt and backlinks of a site. Free, read-only.
Available components
Last scanned (12 hours ago)
Scores higher than 66% of remote servers
Reachable. Last reached 25 Oct 2026.
Category Marketing and SEO
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 Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- 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 Usability78
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 470 tokens (~117/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 Management3
- Stability observed for 1 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 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
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.
- 25 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- 24 Oct 26 74
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 25 Oct 2026 · Probed https://citedby.eu/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=citedby.eu | CN=YR1,O=Let's Encrypt,C=US | 13 Oct 2026 | 11 Jan 2027 | RSA 4096 | SHA256-RSA | 59ed93221f684dbc03b150d271f4e4d220c |
| SANs: citedby.eu | ||||||
| CN=YR1,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | a20253f15f2691c05dc1ce13b9bcca4e |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of citedby.eu. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| eu. | present | 35926 | 8 | Verified |
| citedby.eu. | 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 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000 |
| content-security-policy | default-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; script-src 'self'; connect-src 'self'; base-uri 'self'; form-action 'self' https://buy.stripe.com mailto:; frame-ancestors 'none' |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | camera=(), microphone=(), geolocation=(), payment=() |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://citedby.eu/mcp | Verified | 200 | |
| http (plaintext) | http://citedby.eu/mcp | HTTPS enforced | 301 | https://citedby.eu/mcp |
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 →
backlinks Referring domains of a domain (open data) ~84
How many other domains link to a domain, and the strongest referrers, from the Common Crawl domain web graph. Covers domains with 100 or more referring domains under .eu, EU and UK country domains, plus the 5,000 most-linked sites; says plainly when a domain is not in the data.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | Domain, for example example.com |
No output schema declared.
No examples provided.
check_ai_crawler_access Which AI crawlers can read this site ~99
Read a site's robots.txt and test the server for GPTBot, OAI-SearchBot, ChatGPT-User, PerplexityBot, ClaudeBot, Google-Extended, Bingbot and Googlebot. Returns, per crawler, whether robots.txt allows it and whether the server answers it, so you can see who is blocked and by what.
| Name | Type | Req | Description |
|---|---|---|---|
| site | string | yes | Domain or address of the site, for example example.com |
No output schema declared.
No examples provided.
check_llms_txt Check a site's llms.txt ~74
Fetch /llms.txt of a site and report whether it exists, whether its links work, and whether /llms-full.txt exists. When there is none, the full report holds a draft built from the site's own pages.
| Name | Type | Req | Description |
|---|---|---|---|
| site | string | yes | Domain or address of the site, for example example.com |
No output schema declared.
No examples provided.
check_page Check one page for AI-search and SEO problems ~97
Fetch one public web page as CitedBot (robots.txt respected) and return what is wrong with it for AI answers and search: title, description, headings, structured data, canonical, language, links and more. Each finding has why it matters and the exact fix. Deterministic checks only; says so when the page cannot be fetched.
| Name | Type | Req | Description |
|---|---|---|---|
| url | string | yes | Full page address, for example https://example.com/pricing |
No output schema declared.
No examples provided.
How do I install the CitedBy MCP server?
CitedBy is a hosted endpoint at https://citedby.eu/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 · citedby.eu
claude mcp add --transport http eu-citedby-citedby 'https://citedby.eu/mcp'
What is the CitedBy MCP server?
CitedBy is an MCP server listed in the public MCP registry as eu.citedby/citedby. Check a page, AI-crawler access, llms.txt and backlinks of a site. Free, read-only. This page covers its hosted endpoint (https://citedby.eu/mcp).
Is the CitedBy MCP server safe to use?
CitedBy scores 74 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 CitedBy MCP server expose?
CitedBy exposes 4 tools: check_page, check_ai_crawler_access, check_llms_txt, backlinks. Their descriptions and schemas cost roughly 354 tokens of context every time the server is loaded.
Does the CitedBy MCP server require authentication?
No. We connected to CitedBy without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the CitedBy MCP server still maintained?
CitedBy is still listed as active in the MCP registry. We last reached this channel on 25 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.