MCP server

Mozilla Observatory

io.github.pipeworx-io/mozilla-observatory

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

MDN HTTP Observatory — grade any website's HTTP security headers and get the specific fixes, from…

Website Source

At a glance

Type

MCP server

Publisher

pipeworx.io (verified by the MCP Registry)

Status

Working at last check

Tools

45

Token cost

About 27,019 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http mozilla-observatory https://gateway.pipeworx.io/mozilla-observatory/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.mozilla-observatory]
url = "https://gateway.pipeworx.io/mozilla-observatory/mcp"

Gemini CLI

{"mcpServers":{"mozilla-observatory":{"httpUrl":"https://gateway.pipeworx.io/mozilla-observatory/mcp"}}}

Cursor

{"mcpServers":{"mozilla-observatory":{"url":"https://gateway.pipeworx.io/mozilla-observatory/mcp"}}}

VS Code

{"servers":{"mozilla-observatory":{"type":"http","url":"https://gateway.pipeworx.io/mozilla-observatory/mcp"}}}

Antigravity

agy mcp add mozilla-observatory https://gateway.pipeworx.io/mozilla-observatory/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"mozilla-observatory","server_url":"https://gateway.pipeworx.io/mozilla-observatory/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"mozilla-observatory","server_url":"https://gateway.pipeworx.io/mozilla-observatory/mcp"}

Tools

• observatory_grade_distribution ~110 tokens
  Grade distribution across every site the MDN HTTP Observatory has scanned — how many sites hold each grade from A+ to F. Use it to say where one site's grade sits relative to the web (e.g. "a B beats X% of scanned sites"). Keyless, no arguments.
• observatory_results ~383 tokens
  Get the full MDN HTTP Observatory breakdown for a host: every one of the 12 security tests with pass/fail, the score impact, Mozilla's specific remediation advice (CSP, HSTS, cookies, CORS, referrer policy, subresource integrity, clickjacking, redirection), the observed response headers, and the hos
• observatory_scan ~223 tokens
  Scan a website's HTTP security headers with the MDN HTTP Observatory and return its letter grade (A+ to F), numeric score, and how many of Mozilla's 12 tests it passed. AUTHORITATIVE for "how secure are this site's headers" / "what is this domain's Observatory grade" — this is Mozilla's own scanner,

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