MCPSentinel runs on your own machine — the client starts it, so there is no endpoint to ping. 183 installs a week from pypi. Last commit 21 Sep 2026.
Precision-first security scanning for Model Context Protocol servers.
What the code does
We read the source, 5 d ago · rules 995398eba69f
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.
environment = dict(os.environ) if target.inherit_environment else {
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 mcpsentinel -e 'MCPSENTINEL_ALLOWED_HOSTS=<MCPSENTINEL_ALLOWED_HOSTS>' -- uvx mcp-guardian-scan{
"mcpServers": {
"mcpsentinel": {
"command": "uvx",
"args": [
"mcp-guardian-scan"
],
"env": {
"MCPSENTINEL_ALLOWED_HOSTS": "<MCPSENTINEL_ALLOWED_HOSTS>"
}
}
}
}[mcp_servers.mcpsentinel]
command = "uvx"
args = ["mcp-guardian-scan"]
env = { MCPSENTINEL_ALLOWED_HOSTS = "<MCPSENTINEL_ALLOWED_HOSTS>" }{
"mcpServers": {
"mcpsentinel": {
"command": "uvx",
"args": [
"mcp-guardian-scan"
],
"env": {
"MCPSENTINEL_ALLOWED_HOSTS": "<MCPSENTINEL_ALLOWED_HOSTS>"
}
}
}
}{
"servers": {
"mcpsentinel": {
"type": "stdio",
"command": "uvx",
"args": [
"mcp-guardian-scan"
],
"env": {
"MCPSENTINEL_ALLOWED_HOSTS": "<MCPSENTINEL_ALLOWED_HOSTS>"
}
}
}
}Put your own value in place of
<MCPSENTINEL_ALLOWED_HOSTS> (Comma-separated MCP server hostnames, optionally with an exact port, that the MCP-native scanner may connect to).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
MCPSENTINEL_ALLOW_PRIVATE_HTTP_TARGETS (Set to true only to permit an explicitly allowlisted private or reserved HTTP address in a trusted local network).
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MCPSentinel — questions
Answers built from our own checks of this server.