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AgentKit x402 MCP server

by agentkit-x402.zenith-ops.workers.dev · remote · no sign-in to list tools · v1.0.0 · published by dev.workers.zenith-ops.agentkit-x402

Remote MCP tools for pay-per-call email, domain, SEO and Swedish data utilities (x402).

Changes · 10
CompareRegistry entry

12 tools: 10 change things and 2 only read.

Scanned Oct 21, 2026

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

claude mcp add --transport http agentkit https://agentkit-x402.zenith-ops.workers.dev/mcp

Findings

Matches of fixed checks, with the text they matched.

2 warn
  • Warnse_account_to_iban

    The server marks "se_account_to_iban" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"openWorldHint":true}; The description's first verb is "convert": a word for a change.

    What this check looks for
  • Warnbank_days

    The server marks "bank_days" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"openWorldHint":true}; The description's first verb is "add": 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.

12 tools

Changes things 10Claude Code: ask
  • bank_daysAdds or subtracts Swedish bank days (weekends, public holidays and midsommarafton, julafton, nyarsafton excluded) to a date.Reads text others write1 finding

    Why it is in this group

    • The description's first verb is "add": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.

    Findings

    • Warn

      The server marks "bank_days" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"openWorldHint":true}; The description's first verb is "add": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Adds or subtracts Swedish bank days (weekends, public holidays and midsommarafton, julafton, nyarsafton excluded) to a date. Optional mode=work counts only weekends and red days. Returns the result date with weekday, ISO week and holiday names for both dates.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • demoFree static sample output.Reads text others writeNo 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.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Free static sample output. Pass a paid route slug.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • domain_dnsDNS lookup for a domain through DNS-over-HTTPS: A, AAAA, NS, MX, TXT, CAA, SOA, CNAME records with TTLs, plus DNSSEC presence (DNSKEY, DS) and the resolver validation flag.Reads text others writeNo 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.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    DNS lookup for a domain through DNS-over-HTTPS: A, AAAA, NS, MX, TXT, CAA, SOA, CNAME records with TTLs, plus DNSSEC presence (DNSKEY, DS) and the resolver validation flag. Structured JSON for domain research, due diligence and infrastructure agents.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • email_authEmail deliverability and spoofing-protection audit for a domain: parses SPF (mechanisms, top-level DNS lookup count, +all/~all/-all), DMARC (policy, pct, rua/ruf, alignment), probe…Reads text others writeNo 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.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Email deliverability and spoofing-protection audit for a domain: parses SPF (mechanisms, top-level DNS lookup count, +all/~all/-all), DMARC (policy, pct, rua/ruf, alignment), probes common DKIM selectors, and reports MX, BIMI, MTA-STS and TLS-RPT. Returns prioritised findings with fix hints and a 0-100 score. DNS-based; nested SPF includes are not expanded.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • email_checkEmail address verification for AI agents and lead-qualification pipelines: syntax check, disposable-domain detection, role-account (info@, support@) detection, free-provider flag, …Reads text others writeNo 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.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Email address verification for AI agents and lead-qualification pipelines: syntax check, disposable-domain detection, role-account (info@, support@) detection, free-provider flag, domain typo suggestion (gmial.com -> gmail.com) and DNS MX/A validation via DNS-over-HTTPS. Returns verdict valid, risky, invalid or unknown with a 0-100 score. No SMTP probing, so mailbox existence is not confirmed.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • iban_checkIBAN validation: country-specific length (from a bundled table of IBAN countries), mod-97 checksum, normalised and formatted output, BBAN and check digits.Reads text others writeNo 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.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    IBAN validation: country-specific length (from a bundled table of IBAN countries), mod-97 checksum, normalised and formatted output, BBAN and check digits. Does not check that the account exists.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • pricingFree price table and x402 payment instructions.Reads text others writeNo 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.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Free price table and x402 payment instructions.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • se_account_to_ibanConverts a Swedish clearing number and account number to IBAN and BIC, identifies the bank, and validates the account number checksum according to the bank-specific rules.Reads text others write1 finding

    Why it is in this group

    • The description's first verb is "convert": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.

    Findings

    • Warn

      The server marks "se_account_to_iban" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"openWorldHint":true}; The description's first verb is "convert": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Converts a Swedish clearing number and account number to IBAN and BIC, identifies the bank, and validates the account number checksum according to the bank-specific rules. Clearing table dated 2026-10-16; does not check that the account exists.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • site_auditTechnical SEO audit of one page: HTTP status, redirect chain, title and meta description length, H1 count, canonical, robots meta, hreflang, Open Graph and Twitter tags, JSON-LD ty…Reads text others writeCan send data outNo 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.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • outboundThe input takes a URL (input.url): a request to a URL can carry data to whoever runs it.
    Description, as the server wrote it
    Technical SEO audit of one page: HTTP status, redirect chain, title and meta description length, H1 count, canonical, robots meta, hreflang, Open Graph and Twitter tags, JSON-LD types, images without alt text, link counts, security headers (HSTS, CSP, X-Frame-Options), technology detection (CMS, framework, analytics, CDN) and a prioritised issue list with a 0-100 score. Static HTML only; honours robots.txt.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • site_contactsPublic contact details published on a website: emails (including mailto links and [at] obfuscation, classified role or personal), phone numbers normalised to E.164, social profile …Reads text others writeCan send data outNo 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.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • outboundThe input takes a URL (input.url): a request to a URL can carry data to whoever runs it.
    Description, as the server wrote it
    Public contact details published on a website: emails (including mailto links and [at] obfuscation, classified role or personal), phone numbers normalised to E.164, social profile links, address hints and Swedish organisation numbers for .se sites. Fetches the given page plus up to 3 contact-like pages (/contact, /kontakt, /about, /om-oss, /impressum) on the same host only. Honours robots.txt; returns 403 blocked_by_robots (not charged) if disallowed.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
Only reads 2Claude Code: allow, ask for 1 outbound
  • se_validateValidates Swedish identifiers with checksum and date logic: personnummer, samordningsnummer, organisationsnummer (including sole-trader and VAT forms), bankgiro, plusgiro and OCR p…Reads text others writeNo findings

    Why it is in this group

    • The name "se_validate" says "validate": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Validates Swedish identifiers with checksum and date logic: personnummer, samordningsnummer, organisationsnummer (including sole-trader and VAT forms), bankgiro, plusgiro and OCR payment references. Returns normalised forms and error codes. No application-level storage.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • url_markdownFetches a web page (up to 1.5 MB, 8 s timeout) and returns clean Markdown: title, headings, paragraphs, lists, links, images, code blocks and simple tables, with navigation and foo…Reads private dataReads text others writeCan send data outNo findings

    Why it is in this group

    • The description's first verb is "fetch": a word for reading.

    What it can reach

    • private-dataThe description's first sentence says "fetch" and "table": it reads databases.
    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • untrusted-inputThe name "url_markdown" says "url": it reads web pages, which anyone can write.
    • untrusted-inputThe description's first sentence says "fetch" and "web": it reads web pages, which anyone can write.
    • untrusted-inputThe input takes a URL (input.url), and the tool reads it: it reads web pages, which anyone can write.
    • outboundThe input takes a URL (input.url): a request to a URL can carry data to whoever runs it.

    Claude Code: ask, because it is tagged outbound.

    Description, as the server wrote it
    Fetches a web page (up to 1.5 MB, 8 s timeout) and returns clean Markdown: title, headings, paragraphs, lists, links, images, code blocks and simple tables, with navigation and footers removed. Ready to feed to LLMs. Static HTML only, no JavaScript rendering. Honours robots.txt.

    Annotations the server declares

    • readOnlyHint: 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.

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.

36 paths in this server alone from private data, through text someone else wrote, to a way out. Denying 1 private-data tool breaks every one.

Reads private data1
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write12
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out3
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
deny to break every path
{
  "permissions": {
    "deny": [
      "mcp__agentkit__url_markdown"
    ]
  }
}

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.

Looked at Oct 22, 2026, 14:47 UTC, unchanged since Oct 22, 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
10
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
none
RFC 9728 protected resource metadata
none
Authorization servers
none
Legacy HTTP+SSE transport
no
Dynamic client registration
not observed
Client ID metadata documents
not observed
  • WarnThe whole server

    The endpoint served tools/list without credentials, and the list has 10 tools that change things (10 write). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://agentkit-x402.zenith-ops.workers.dev/mcp: tools/list returned 12 tools to an anonymous client, including email_check (write), email_auth (write), domain_dns (write), site_contacts (write), site_audit (write) and 5 more

    What this check looks for

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http agentkit https://agentkit-x402.zenith-ops.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__agentkit__se_validate"
    ],
    "ask": [
      "mcp__agentkit__email_check",
      "mcp__agentkit__email_auth",
      "mcp__agentkit__domain_dns",
      "mcp__agentkit__site_contacts",
      "mcp__agentkit__site_audit",
      "mcp__agentkit__url_markdown",
      "mcp__agentkit__iban_check",
      "mcp__agentkit__se_account_to_iban",
      "mcp__agentkit__bank_days",
      "mcp__agentkit__pricing",
      "mcp__agentkit__demo"
    ],
    "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 agentkit. Review it before you use it.

Capability tags behind 12 rules
  • mcp__agentkit__email_check untrusted-input
  • mcp__agentkit__email_auth untrusted-input
  • mcp__agentkit__domain_dns untrusted-input
  • mcp__agentkit__site_contacts untrusted-input, outbound
  • mcp__agentkit__site_audit untrusted-input, outbound
  • mcp__agentkit__url_markdown private-data, untrusted-input, outbound
  • mcp__agentkit__se_validate untrusted-input
  • mcp__agentkit__iban_check untrusted-input
  • mcp__agentkit__se_account_to_iban untrusted-input
  • mcp__agentkit__bank_days untrusted-input
  • mcp__agentkit__pricing untrusted-input
  • mcp__agentkit__demo untrusted-input