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Is HeaderGuard reliable?

Reliable (measured) Yes. Faceabot measured HeaderGuard 36 times: 100% of checks succeeded, including the last 36 in a row (last check 2026-10-20 00:35 UTC). It also does the job: its real read-only task worked 36 of 36 times.

Last check: 2026-10-20 00:35 UTC · answered in 6385 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

Scan a website's HTTP security headers (HSTS, CSP, framing, COOP/CORP, cookies). Score + fixes.

Source: official MCP registry (registry.modelcontextprotocol.io) · version 0.4.0 · publisher website
Connect your agent
{
  "mcpServers": {
    "headerguard": {
      "url": "https://headerguard.mike-tusa.workers.dev/mcp"
    }
  }
}
Or ask Faceabot first: MCP tool check_reliability {"id":"dev.workers.mike-tusa.headerguard/headerguard"} on https://faceabot.com/api/mcp.
Does it actually do the job?

Does the job (tested) — Faceabot asked scan_headers to do a small read-only task 36 time(s): 36 returned a real result, the last 36 in a row. Last result: ok in 3468 ms.

Sample input: {"url":"https://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

AI Website Security Reliable (measured) · 100%
Security basics of a website: HTTPS certificate, redirection, headers, mixed content, DNS filtering. · https://scan.aiwebsitesecurity.com/api/mcp

mcp-domain-auditor Reliable (measured) · 100%
DNS resolution, HTTP security headers, and SPF/DMARC email hygiene audits. · https://mcp-domain-auditor.stubby76.workers.dev/mcp

Domain Health Reliable (measured) · 100%
Domain checks: SPF, DKIM, DMARC, BIMI, MTA-STS, SSL/TLS and HTTP security headers. · https://mcp.modernmustardseed.com/domain-health

Picked from Faceabot's live measurements. Or let Faceabot choose: GET https://faceabot.com/resolve?need=…
Faceabot measurements
WhenAnswersReal taskLatency
2026-10-20 00:35 UTC✅ ok✅ done6385 ms
2026-10-19 12:20 UTC✅ ok✅ done8000 ms
2026-10-18 20:05 UTC✅ ok✅ done5238 ms
2026-10-18 07:05 UTC✅ ok✅ done6123 ms
2026-10-17 23:15 UTC✅ ok✅ done5436 ms
2026-10-17 15:05 UTC✅ ok✅ done6933 ms
2026-10-17 07:00 UTC✅ ok✅ done7790 ms
2026-10-16 23:15 UTC✅ ok✅ done3813 ms
2026-10-16 16:05 UTC✅ ok✅ done7027 ms
2026-10-16 09:05 UTC✅ ok✅ done3710 ms
2026-10-16 02:10 UTC✅ ok✅ done4707 ms
2026-10-15 19:15 UTC✅ ok✅ done5163 ms
2026-10-15 12:31 UTC✅ ok✅ done3171 ms
2026-10-15 05:55 UTC✅ ok✅ done3044 ms
2026-10-14 23:20 UTC✅ ok✅ done3717 ms
2026-10-14 17:00 UTC✅ ok✅ done6806 ms
2026-10-14 10:30 UTC✅ ok✅ done3557 ms
2026-10-14 03:56 UTC✅ ok✅ done5902 ms
2026-10-13 21:20 UTC✅ ok✅ done6325 ms
2026-10-13 15:15 UTC✅ ok✅ done7804 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.

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Publisher of HeaderGuard?

Show your measured reliability on your README or website:

Faceabot reliability badge for HeaderGuard

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

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