List groups on a Linux host. Args: client_id: The Velociraptor client ID. org_id: Optional Velociraptor org ID for multi-tenant deployments. GroupFile: The location of the group file Fields: Comma-separated string of fields to return. Returns: The group names as a string or error message.
AI agents call linux_groups 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 performs a read-only query of group information on a Linux system. It retrieves and returns group data without making any changes to the host, executing commands, or triggering side effects. Misuse by an AI agent would be limited to unauthorized information disclosure about system groups, which poses a low risk with narrow blast radius.
From the tool's definition Tool description states it 'List groups on a Linux host' and returns 'The group names as a string'. The parameters (client_id, org_id, GroupFile, Fields) are all for filtering or specifying what to read, not for modifying system state.
Documented attack patterns abuse exactly the kind of access linux_groups 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_groups:
{
"version": "1",
"default": "deny",
"tools": {
"linux_groups": {}
}
}linux_groups is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List groups on a Linux host. Args: client_id: The Velociraptor client ID. org_id: Optional Velociraptor org ID for multi-tenant deployments. GroupFile: The location of the group file Fields: Comma-separated string of fields to return. Returns: The group names 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_groups: 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_groups 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_groups 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_groups. 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_groups 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.