Heimdall runs on your own machine — the client starts it, so there is no endpoint to ping. 42 installs a week from npm. Last commit 6 Jul 2026.
Scan an MCP server or agent config for injection, exfiltration, and risky capabilities.
What the code does
We read the source, 22 h ago · rules 3dff92dd89df
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.
child = spawn(command, args, {
function mkChecks(id, info, cls) { $(id).innerHTML = Object.entries(info).map(([k,[l]]) => `<label style="font-size:13px;display:flex;align-items:center;justify-content:flex-start;gap:8px;width:100%;cursor:pointer"><input type="checkbox" class="${cls}" value="${k}" style="flex:…
test: /\.ssh\/|\bid_rsa\b|\bid_ed25519\b|\bauthorized_keys\b/i,
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
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 heimdall -- npx -y mcp-heimdall-scan{
"mcpServers": {
"heimdall": {
"args": [
"-y",
"mcp-heimdall-scan"
],
"command": "npx"
}
}
}[mcp_servers.heimdall]
command = "npx"
args = ["-y", "mcp-heimdall-scan"]{
"mcpServers": {
"heimdall": {
"args": [
"-y",
"mcp-heimdall-scan"
],
"command": "npx"
}
}
}{
"mcpServers": {
"heimdall": {
"args": [
"-y",
"mcp-heimdall-scan"
],
"command": "npx"
}
}
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Heimdall — questions
Answers built from our own checks of this server.