List users on a Linux host. Args: client_id: The Velociraptor client ID. org_id: Optional Velociraptor org ID for multi-tenant deployments. Fields: Comma-separated string of fields to return. Returns: The user results as a string or error message.
AI agents call linux_users to retrieve information from Velociraptor MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns user account information from a Linux system. It is a read-only operation with no side effects—it does not create, modify, delete, or execute anything. The blast radius of misuse is limited to unauthorized information disclosure about system users, which is lower severity than write, execute, or destructive operations.
From the tool's definition Tool name 'linux_users' and description 'List users on a Linux host' indicate a query operation that retrieves existing user information without modification. No creation, deletion, execution, or financial operation is performed.
Documented attack patterns abuse exactly the kind of access linux_users gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Velociraptor MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for linux_users:
{
"version": "1",
"default": "deny",
"tools": {
"linux_users": {}
}
}linux_users is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List users on a Linux host. Args: client_id: The Velociraptor client ID. org_id: Optional Velociraptor org ID for multi-tenant deployments. Fields: Comma-separated string of fields to return. Returns: The user results as a string or error message. It is categorised as a Read tool in the Velociraptor MCP MCP Server, which means it retrieves data without modifying state.
Register the Velociraptor MCP server in PolicyLayer and add a rule for linux_users: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Velociraptor MCP. Nothing to install.
linux_users is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the linux_users rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for linux_users. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
linux_users is provided by the Velociraptor MCP server (mgreen27/mcp-velociraptor). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Velociraptor MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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28 Velociraptor MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.