MCP Security Guard runs on your own machine — the client starts it, so there is no endpoint to ping. 600 installs a week from npm. Last commit 9 Oct 2026.
Audit MCP servers for tool poisoning, rug pulls and supply-chain risk (OWASP MCP Top 10).
What the code does
We read the source, 2 d ago · rules ccca72095570
Things with no honest explanation: a promise that contradicts the code, code that runs at install time while hiding what it does, data leaving the machine.
const STRONG_STORE = String.raw`\.ssh\b|\.aws\b|\.gnupg\b|\.kube\b|\.npmrc\b|\.netrc\b|\.pypirc\b|\.git-credentials\b|\bid_(?:rsa|ed25519|ecdsa)\b|credentials\.json\b|\bKeychains?\b|Login Data|\bwallet\.dat\b|\.config\/gcloud|\/etc\/(?:passwd|shadow)\b|(?:Chrome|Chromium|Firefox|…
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
const STRONG_STORE = String.raw`\.ssh\b|\.aws\b|\.gnupg\b|\.kube\b|\.npmrc\b|\.netrc\b|\.pypirc\b|\.git-credentials\b|\bid_(?:rsa|ed25519|ecdsa)\b|credentials\.json\b|\bKeychains?\b|Login Data|\bwallet\.dat\b|\.config\/gcloud|\/etc\/(?:passwd|shadow)\b|(?:Chrome|Chromium|Firefox|…
…?:\/\/(?:\d{1,3}(?:\.\d{1,3}){3}|[^/\s"']*(?:pastebin\.com|paste\.ee|hastebin|bit\.ly|tinyurl\.com|is\.gd|webhook\.site|requestbin|pipedream\.net|ngrok(?:-free)?\.(?:io|app|dev)|trycloudflare\.com|transfer\.sh|interact\.sh|oast\.\w+|burpcollaborator|discord(?:app)?\.com\/api\/web…
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
We found things in this code
Code changes quietly between releases, and nobody reads the diff of a dependency. We do, on every release — watch MCP Security Guard and you get told the day something new turns up.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add mcp-security-guard -- npx -y mcp-security-guard{
"mcpServers": {
"mcp-security-guard": {
"args": [
"-y",
"mcp-security-guard"
],
"command": "npx"
}
}
}[mcp_servers.mcp-security-guard]
command = "npx"
args = ["-y", "mcp-security-guard"]{
"mcpServers": {
"mcp-security-guard": {
"args": [
"-y",
"mcp-security-guard"
],
"command": "npx"
}
}
}{
"mcpServers": {
"mcp-security-guard": {
"args": [
"-y",
"mcp-security-guard"
],
"command": "npx"
}
}
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MCP Security Guard — questions
Answers built from our own checks of this server.