Domain Health
Domain checks: SPF, DKIM, DMARC, BIMI, MTA-STS, SSL/TLS and HTTP security headers.
| Endpoint | https://mcp.modernmustardseed.com/domain-health (streamable-http) |
|---|---|
| Registry version | 1.0.0 |
| Now | 5 tools · grade A (99) · pin ts_23750060d1211677156266f05569a851 · protocol 2025-06-18 |
| First / last listed | 2026-10-27 01:33 UTC / 2026-10-27 01:33 UTC |
| Grade over time | 2026-10-27: A (99), 5 tools |
Is this your server? Own a server? ToolFit hosted watch re-checks it every 24 h ($0.25 per 30 days) or 6 h ($0.60) and sends you an HMAC-signed webhook when its tools or grade change: POST https://api.youraitools.co/toolfit/v1/watch. To opt out, see About & opt-out.
Tools: check_email_auth check_ssl check_security_headers check_domain_registration full_domain_report
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 sen params: domain*, dkim_selectors, detail |
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 an params: domain*, include_www, detail |
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 o params: domain*, detail |
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-c params: domain*, detail |
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. params: domain*, dkim_selectors, detail |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.