AI agents call list_groups to retrieve information from Ludus FastMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves group information without modifying, deleting, or executing any operations. It is a straightforward read operation that has no impact on the system state beyond information disclosure. The low severity reflects minimal risk even if misused by an AI agent, as it only exposes existing group metadata.
From the tool's definition Tool name 'list_groups' and description 'List all groups' indicates a retrieval operation with no side effects. The return value is explicitly stated as 'List of all groups' with no modification or deletion semantics.
Documented attack patterns abuse exactly the kind of access list_groups gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ludus FastMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_groups:
{
"version": "1",
"default": "deny",
"tools": {
"list_groups": {}
}
}list_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 all groups. Returns: List of all groups. It is categorised as a Read tool in the Ludus FastMCP MCP Server, which means it retrieves data without modifying state.
Register the Ludus Fast MCP server in PolicyLayer and add a rule for list_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 Ludus FastMCP. Nothing to install.
list_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 list_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 list_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.
list_groups is provided by the Ludus Fast MCP server (tjnull/ludus-fastmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 201 Ludus FastMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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201 Ludus FastMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.