Web & domain tools

by fourzerotwo.si · remote · no sign-in to list tools · v1.0.1 · published by si.fourzerotwo

Read any public page as markdown, link previews, URL safety, page audits, domain availability and…

Changes · 21

Compare Registry entry

25 tools: 21 change things and 4 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things21Claude Code: ask: see these tools
Only reads4Claude Code: allow: see these tools

2 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http web https://fourzerotwo.si/mcp/v/web

Findings

Matches of fixed checks, with the text they matched.

2 warn

Warnseo__links
The server marks "seo__links" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "seo__links" says "link": a word for a change.
What this check looks for
Warnweb__unfurl
The server marks "web__unfurl" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "open": a word for a change.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

25 tools

Changes things 21Creates or changes something that can be changed back.Claude Code: ask

domains__abuse-contactsEveryone to send an abuse or takedown report to for a site: platform agent, hosting network (+ abuse email, CDN flag) and registrar.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Everyone to send an abuse or takedown report to for a site: platform agent, hosting network (+ abuse email, CDN flag) and registrar. A few free samples a day, then $0.005 USDC per call via x402.
Annotations the server declares
- title: Domains & DNS: Where to report a site
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
domains__availabilityRegistered or available, straight from the TLD registry.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Registered or available, straight from the TLD registry. A few free samples a day, then $0.002 USDC per call via x402.
Annotations the server declares
- title: Domains & DNS: Domain availability
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
domains__dmca-agentPublished DMCA / abuse contact (email or form) for a major platform, host, CDN or registrar.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Published DMCA / abuse contact (email or form) for a major platform, host, CDN or registrar. A few free samples a day, then $0.002 USDC per call via x402.
Annotations the server declares
- title: Domains & DNS: DMCA agent
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
domains__dnsA, AAAA, MX, NS, TXT, CNAME and CAA records (or one type).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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
A, AAAA, MX, NS, TXT, CNAME and CAA records (or one type). A few free samples a day, then $0.001 USDC per call via x402.
Annotations the server declares
- title: Domains & DNS: DNS records
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
domains__email-authMX, SPF and DMARC for a domain, the mail provider, issues found and a grade.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
MX, SPF and DMARC for a domain, the mail provider, issues found and a grade. A few free samples a day, then $0.003 USDC per call via x402.
Annotations the server declares
- title: Domains & DNS: Email authentication check
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
domains__factsRegistrar, created, expiry, age, status codes, nameservers and DNSSEC.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Registrar, created, expiry, age, status codes, nameservers and DNSSEC. A few free samples a day, then $0.002 USDC per call via x402.
Annotations the server declares
- title: Domains & DNS: Domain registration facts
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
domains__ideasRule-based domain candidates for a keyword: exact, stopword-free, hyphenated, prefixed and suffixed, across chosen TLDs, with a trademark flag.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Rule-based domain candidates for a keyword: exact, stopword-free, hyphenated, prefixed and suffixed, across chosen TLDs, with a trademark flag. Free within the daily allowance, then $0.002 USDC per call via x402.
Annotations the server declares
- title: Domains & DNS: Domain name ideas
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
domains__ip-ownerNetwork, organisation, range, country and abuse email for an IP, from the regional internet registry.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Network, organisation, range, country and abuse email for an IP, from the regional internet registry. A few free samples a day, then $0.002 USDC per call via x402.
Annotations the server declares
- title: Domains & DNS: IP owner
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
ip-geolocation__asnASN, organisation and hosting flag for one IP.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
ASN, organisation and hosting flag for one IP. Free within the daily allowance, then $0.0005 USDC per call via x402.
Annotations the server declares
- title: IP Geolocation & ASN: IP to network owner
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
ip-geolocation__batchFull lookup for up to 100 IPs in one call.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Full lookup for up to 100 IPs in one call. A few free samples a day, then $0.02 USDC per call via x402.
Annotations the server declares
- title: IP Geolocation & ASN: Batch lookup
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
ip-geolocation__countryCountry and continent for one IP.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Country and continent for one IP. Free within the daily allowance, then $0.0005 USDC per call via x402.
Annotations the server declares
- title: IP Geolocation & ASN: IP to country
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
seo__keyword-intentClassify a search keyword as transactional, commercial, navigational or informational.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Classify a search keyword as transactional, commercial, navigational or informational. A few free samples a day, then $0.0005 USDC per call via x402.
Annotations the server declares
- title: SEO Tools: Keyword intent
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
seo__linksInternal and external links on a page with anchor text and nofollow flags.1 finding
Why it is in this group
- The name "seo__links" says "link": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "seo__links" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "seo__links" says "link": a word for a change.
  What this check looks for
Description, as the server wrote it
Internal and external links on a page with anchor text and nofollow flags. A few free samples a day, then $0.003 USDC per call via x402.
Annotations the server declares
- title: SEO Tools: Extract links
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
seo__page-auditTitle, meta, H1, canonical, noindex, hreflang, structured data, OG tags, word count, links, alt text, issues and a score.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Title, meta, H1, canonical, noindex, hreflang, structured data, OG tags, word count, links, alt text, issues and a score. A few free samples a day, then $0.005 USDC per call via x402.
Annotations the server declares
- title: SEO Tools: On-page SEO audit
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
seo__robots-checkWhether a crawler (Googlebot, GPTBot, ClaudeBot…) may fetch a URL, the rule that decided it, and declared sitemaps.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Whether a crawler (Googlebot, GPTBot, ClaudeBot…) may fetch a URL, the rule that decided it, and declared sitemaps. A few free samples a day, then $0.002 USDC per call via x402.
Annotations the server declares
- title: SEO Tools: robots.txt check
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
validators__emailEmail syntax, whether the domain accepts mail, disposable and role-account flags.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Email syntax, whether the domain accepts mail, disposable and role-account flags. Free within the daily allowance, then $0.001 USDC per call via x402.
Annotations the server declares
- title: Validators: Email check
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
validators__ibanIBAN mod-97 checksum and country length; UK sort code extracted.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
IBAN mod-97 checksum and country length; UK sort code extracted. Free within the daily allowance, then $0.0005 USDC per call via x402.
Annotations the server declares
- title: Validators: IBAN check
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
validators__uk-phoneClassify a UK number (mobile, landline, freephone, premium…) and format as E.164.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Classify a UK number (mobile, landline, freephone, premium…) and format as E.164. Free within the daily allowance, then $0.0005 USDC per call via x402.
Annotations the server declares
- title: Validators: UK phone number
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
validators__vinVIN format, check digit, WMI and model-year candidates.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
VIN format, check digit, WMI and model-year candidates. Free within the daily allowance, then $0.0005 USDC per call via x402.
Annotations the server declares
- title: Validators: VIN check
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
web__unfurlOpen Graph and Twitter card data, favicon, theme colour, JSON-LD types, RSS/Atom feeds and sitemaps for a URL.1 finding
Why it is in this group
- The description's first verb is "open": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "web__unfurl" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "open": a word for a change.
  What this check looks for
Description, as the server wrote it
Open Graph and Twitter card data, favicon, theme colour, JSON-LD types, RSS/Atom feeds and sitemaps for a URL. Free within the daily allowance, then $0.002 USDC per call via x402.
Annotations the server declares
- title: Web Reader: Link preview (unfurl)
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
web__url-safetyWarning signs for a URL: redirect chain and final destination, TLS certificate, domain age, punycode and brand-lookalike tricks, bare IPs, and security-header grade.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Warning signs for a URL: redirect chain and final destination, TLS certificate, domain age, punycode and brand-lookalike tricks, bare IPs, and security-header grade. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: Web Reader: URL safety check
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

Only reads 4Looks things up and changes nothing.Claude Code: allow

ip-geolocation__lookupCountry, continent, EU membership, network block, ASN, organisation and hosting flag for one IP.No findings
Why it is in this group
- The name "ip-geolocation__lookup" says "lookup": a word for reading.
Description, as the server wrote it
Country, continent, EU membership, network block, ASN, organisation and hosting flag for one IP. Free within the daily allowance, then $0.001 USDC per call via x402.
Annotations the server declares
- title: IP Geolocation & ASN: IP lookup
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
validators__imeiValidate an IMEI (length + Luhn) and split TAC, serial and check digit.No findings
Why it is in this group
- The description's first verb is "validate": a word for reading.
Description, as the server wrote it
Validate an IMEI (length + Luhn) and split TAC, serial and check digit. Free within the daily allowance, then $0.0005 USDC per call via x402.
Annotations the server declares
- title: Validators: IMEI check digit
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
validators__uk-postcodeValidate and normalise UK postcode format; split outward/inward codes.No findings
Why it is in this group
- The description's first verb is "validate": a word for reading.
Description, as the server wrote it
Validate and normalise UK postcode format; split outward/inward codes. Free within the daily allowance, then $0.0005 USDC per call via x402.
Annotations the server declares
- title: Validators: UK postcode format
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
web__readMain content of a public web page as clean markdown, with title, byline, published date, canonical URL, language, word count and links.No findings
Why it is in this group
- The name "web__read" says "read": a word for reading.
Description, as the server wrote it
Main content of a public web page as clean markdown, with title, byline, published date, canonical URL, language, word count and links. A few free samples a day, then $0.003 USDC per call via x402.
Annotations the server declares
- title: Web Reader: Read a page as markdown
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

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.

Install

Pinned to version 1.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http web https://fourzerotwo.si/mcp/v/web

Run in a terminal.

Claude Code permissions

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

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__web__ip-geolocation__lookup",
      "mcp__web__validators__imei",
      "mcp__web__validators__uk-postcode",
      "mcp__web__web__read"
    ],
    "ask": [
      "mcp__web__domains__availability",
      "mcp__web__domains__facts",
      "mcp__web__domains__dns",
      "mcp__web__domains__ip-owner",
      "mcp__web__domains__dmca-agent",
      "mcp__web__domains__abuse-contacts",
      "mcp__web__domains__email-auth",
      "mcp__web__domains__ideas",
      "mcp__web__ip-geolocation__country",
      "mcp__web__ip-geolocation__asn",
      "mcp__web__ip-geolocation__batch",
      "mcp__web__seo__robots-check",
      "mcp__web__seo__page-audit",
      "mcp__web__seo__links",
      "mcp__web__seo__keyword-intent",
      "mcp__web__validators__vin",
      "mcp__web__validators__iban",
      "mcp__web__validators__uk-phone",
      "mcp__web__validators__email",
      "mcp__web__web__unfurl",
      "mcp__web__web__url-safety"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as web. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/si.fourzerotwo/web/changes.xml

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

Anlyon alternative

21 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 →

Compare with other servers for the same product.

Source: MCP Registry. Synced Oct 21, 2026, 18:54 UTC.

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