x509 mcp for Zed

io.github.mrfentmen/x509-mcp

Decode PEM certificates, check expiry and inspect a live TLS certificate, all offline

client:Zed transport:stdio runtime:npm

Install x509 mcp in Zed

~/.config/zed/settings.json · windows: %APPDATA%\Zed\settings.json

{
  "context_servers": {
    "x509-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mrfentmen/x509-mcp"
      ]
    }
  }
}

Merge this into your existing settings object — do not replace the file. Zed docs