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Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

MCP server · Other

Domain Health

By modernmustardseed.com

Domain checks: SPF, DKIM, DMARC, BIMI, MTA-STS, SSL/TLS and HTTP security headers.

WebsiteSecurity & identityHealth & science
Connect to Domain Health
Checks passed
12 / 22

2 failed · 8 not measured

Median response
425 ms

Median of successful probes over 7 days

30-day uptime
Not measured

Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.

Discovered tools
5

Tool definitions returned by this server

Independent monitoring

Health & checks

Status history

Outdated check

Last connection measurement is over 24 hours old. Current availability is unknown.

Last checked
Check summary by test group
Test areaPassedFailedUnmeasured
ConnectionCan a client connect and discover tools?
500
Reliability & speedDoes it respond consistently and quickly?
004
Access & authenticationWhat is required to use this server?
102
Tool qualityAre the tool definitions usable by an agent?
400
Publisher identityCan the publisher be traced to its source?
222

Unmeasured means there is not enough evidence to decide. How these checks work

Inspect individual checks 22 recorded

Core

  • Pass
    Reachable

    Latest probe returned HTTP 200 in 425 ms.

  • Pass
    Valid handshake

    protocolVersion 2025-11-25, serverInfo.name Domain Health by Modern Mustard Seed.

  • Pass
    Lists tools

    tools/list returned 5 tools.

  • Pass
    Current protocol

    Negotiated 2025-11-25. The bar is 2025-06-18 or newer.

  • Pass
    HTTPS

    The endpoint URL is https.

Performance

  • Not measured
    Fast (p50)

    Median latency 425 ms over 1 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 425 ms over 1 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    1 of 1 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Not measured
    Stable tool list

    Fewer than two successful probes in 30 days, so tool-list stability is not measured.

Access

  • Pass
    Open access

    tools/list succeeded with no credential, and the record declares none.

  • Not measured
    Standard auth

    Auth is not required, so the OAuth metadata check does not apply.

  • Not measured
    Free tier cited

    No publisher quote has been checked.

Tools

  • Pass
    Tools described

    Every tool description is at least 20 characters.

  • Pass
    Valid input schemas

    Every inputSchema is a JSON Schema object.

  • Pass
    Parameters documented

    13 of 13 parameters have a description (100%). The bar is 80%.

  • Pass
    Safety hints

    Every tool sets readOnlyHint or destructiveHint.

Publisher

  • Pass
    Verified namespace

    Listed in the Official MCP Registry.

  • Fail
    Website matches publisher

    The website host does not match the reverse-domain namespace.

  • Fail
    Source repo linked

    No repository URL is on file.

  • Not measured
    Repo owner matches

    This namespace is not an io.github login, so the owner comparison does not apply.

  • Pass
    Recently updated

    Updated 2026-10-11T19:11:49.546609Z, within 180 days.

  • Not measured
    Open-source licence

    No GitHub repository to ask about a licence.

Start using Domain Health

Connect to this server

Choose your client, copy the configuration, then enable the server in your client’s MCP settings.

Run this command in your terminal, then restart Claude Code.

Claude Code

claude mcp add --transport http domain-health https://mcp.modernmustardseed.com/domain-health

Capabilities

Tools 5

check_domain_registration

Read a domain's public registration record from its registry over RDAP (no WHOIS scraping): registrar, creation, expiry and last-change dates, status locks such as clientTransferProhibited, danger states such as redemption period or hold, and nameservers. Also compares the registry's nameservers with the live zone and checks DNSSEC. Subdomains are checked as their registered domain. Some country-code registries do not publish RDAP; the tool says so.

Discovered
check_email_auth

Explain in plain words whether email from a domain will reach the inbox and whether others can forge it. Checks MX, SPF with every include expanded and counted against the 10-lookup limit, DMARC policy, alignment and report permissions, DKIM keys at about 40 common selectors plus any you name (with key size), BIMI, MTA-STS and TLS-RPT, and the DNS rules Google, Yahoo and Microsoft set for bulk senders. Every finding has a severity, a one-sentence fix and the RFC or provider document behind it. Reads public DNS only.

Discovered
check_security_headers

Read the HTTP security headers a domain's homepage sends, as a browser receives them, and grade each: Strict-Transport-Security, Content-Security-Policy, clickjacking protection (X-Frame-Options or CSP frame-ancestors), X-Content-Type-Options, Referrer-Policy and Permissions-Policy, plus whether http:// redirects to https://, cookie flags, and software version disclosure. Only public web servers on ports 80 and 443 are contacted.

Discovered
check_ssl

Check the HTTPS certificate and TLS setup of a domain on port 443: issuer, expiry date and days left, whether the chain is complete and trusted, whether the certificate matches the name, key type and size, which TLS versions (1.0 to 1.3) the server accepts, and the CAA record that limits who may issue certificates. Checks www as well when given a bare domain. Every finding has a severity, a fix and a citation.

Discovered
full_domain_report

Run every Domain Health check on one domain at once (email authentication, SSL and TLS, security headers, registration and DNSSEC) and answer three questions in plain words: will its email land, is its website safe, and is the domain owned well. Returns a score and grade per area, the top fixes across all areas, and every finding with its severity, fix and citation. Takes 5 to 20 seconds.

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 14 days.
CheckedResultResponseTools
Connected425 ms5

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