Get current user's group memberships (Ludus 2.0 only). Returns: List of group memberships
AI agents call get_user_memberships 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 retrieves information about the current user's group memberships. It performs a query operation with no capability to modify data, execute commands, or cause irreversible changes. The blast radius of misuse is minimal—an attacker would only gain visibility into group membership information, which does not grant unauthorized access or cause operational impact on its own.
From the tool's definition Tool name is 'get_user_memberships' and description states 'Get current user's group memberships' with return value 'List of group memberships'. The verb 'get' and the retrieval-only nature indicate no data modification or side effects.
Documented attack patterns abuse exactly the kind of access get_user_memberships 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 get_user_memberships:
{
"version": "1",
"default": "deny",
"tools": {
"get_user_memberships": {}
}
}get_user_memberships is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get current user's group memberships (Ludus 2.0 only). Returns: List of group memberships. 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 get_user_memberships: 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.
get_user_memberships 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 get_user_memberships 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 get_user_memberships. 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.
get_user_memberships 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.
Free to start. No card required.
201 Ludus FastMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.