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Is CertGuard reliable?

Reliable (measured) Yes. Faceabot measured CertGuard 35 times: 100% of checks succeeded, including the last 35 in a row (last check 2026-10-19 12:50 UTC). It answers, but its real task has not worked yet (0/35 real results): see "Does it actually do the job?" below.

Last check: 2026-10-19 12:50 UTC · answered in 8292 ms · remote (no install)

En français : Fiable (mesuré). Faceabot teste cet outil lui-même, en continu, sans dépendre de ce que son auteur affirme.

What it does

Free SSL/TLS certificate checker: expiry, chain trust, hostname match, TLS version, A/B/C/F grade.

Source: official MCP registry (registry.modelcontextprotocol.io) · version 0.2.0 · publisher website
Connect your agent
{
  "mcpServers": {
    "certguard": {
      "url": "https://certguard.mike-tusa.workers.dev/mcp"
    }
  }
}
Or ask Faceabot first: MCP tool check_reliability {"id":"dev.workers.mike-tusa.certguard/certguard"} on https://faceabot.com/api/mcp.
Does it actually do the job?

Fails real tasks — Faceabot asked check_certificate to do a small read-only task 35 time(s): 0 returned a real result. Last result: tool_error (the tool answered with an error for the neutral sample input) in 4350 ms.

Sample input: {"host":"example.com"}. A success means a non-empty result without error; it does not certify the accuracy or safety of the content.
Other proven tools for the same job

SSL Certificate Check Flaky · 90%
Inspect one endpoint's served certificate, expiry, hostname coverage, and accepted TLS versions. · https://powmcp.com/ssl-certificate-check/mcp

domain-osint-mcp Reliable (measured) · 100%
Inspects live IPv4/IPv6 DNS resolution, TLS certificate issuer/expiry, and HTTP security grade. · https://domain-osint-72343955726.us-central1.run.app/mcp/domain-osint

Picked from Faceabot's live measurements. Or let Faceabot choose: GET https://faceabot.com/resolve?need=…
Faceabot measurements
WhenAnswersReal taskLatency
2026-10-19 12:50 UTC✅ ok❌ tool_error8292 ms
2026-10-18 20:45 UTC✅ ok❌ tool_error5606 ms
2026-10-18 07:25 UTC✅ ok❌ tool_error5013 ms
2026-10-17 23:35 UTC✅ ok❌ tool_error5616 ms
2026-10-17 15:25 UTC✅ ok❌ tool_error6308 ms
2026-10-17 07:20 UTC✅ ok❌ tool_error7137 ms
2026-10-16 23:35 UTC✅ ok❌ tool_error5057 ms
2026-10-16 16:25 UTC✅ ok❌ tool_error5990 ms
2026-10-16 09:25 UTC✅ ok❌ tool_error7248 ms
2026-10-16 02:31 UTC✅ ok❌ tool_error8868 ms
2026-10-15 19:35 UTC✅ ok❌ tool_error6969 ms
2026-10-15 12:51 UTC✅ ok❌ tool_error3753 ms
2026-10-15 06:15 UTC✅ ok❌ tool_error3964 ms
2026-10-14 23:45 UTC✅ ok❌ tool_error3814 ms
2026-10-14 17:20 UTC✅ ok❌ tool_error8417 ms
2026-10-14 10:50 UTC✅ ok❌ tool_error3930 ms
2026-10-14 04:21 UTC✅ ok❌ tool_error5686 ms
2026-10-13 21:40 UTC✅ ok❌ tool_error6725 ms
2026-10-13 15:35 UTC✅ ok❌ tool_error5647 ms
2026-10-13 09:25 UTC✅ ok❌ tool_error5606 ms
Method: MCP initialize then tools/list from Faceabot (FaceabotProbe/1.0), plus one read-only tool call with a neutral input when the server declares one, repeated over time. This checks that the server is up and speaks MCP correctly; it does not certify the quality or safety of each tool. How measurement works.

Find tools similar to CertGuard →

Publisher of CertGuard?

Show your measured reliability on your README or website:

Faceabot reliability badge for CertGuard

[![Measured by Faceabot](https://faceabot.com/badge/dev.workers.mike-tusa.certguard/certguard.svg)](https://faceabot.com/tools/dev.workers.mike-tusa.certguard/certguard)
Data in JSON: /api/catalog?id=dev.workers.mike-tusa.certguard/certguard · Stop probes: POST /api/reliability/opt-out

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