Revoke range access from a user. Args: user_id: User ID to revoke range access from range_id: Range ID to revoke Returns: Revocation result
AI agents call revoke_range_from_user to permanently remove resources in Ludus FastMCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Revoking range access removes permissions from a user for a specific range. While not deleting data, access revocation is typically treated as a destructive/irreversible action since the user loses access immediately and restoration requires explicit re-granting. In a cyber range context, this could disrupt active security research or testing sessions.
From the tool's definition 'Revoke range access from a user' - revocation of access is typically irreversible without explicit re-granting, and removes a user's ability to access a cyber range environment
Documented attack patterns abuse exactly the kind of access revoke_range_from_user 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 revoke_range_from_user:
{
"version": "1",
"default": "deny",
"hide": [
"revoke_range_from_user"
]
}revoke_range_from_user disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Revoke range access from a user. Args: user_id: User ID to revoke range access from range_id: Range ID to revoke Returns: Revocation result. It is categorised as a Destructive tool in the Ludus FastMCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Ludus Fast MCP server in PolicyLayer and add a rule for revoke_range_from_user: 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.
revoke_range_from_user is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the revoke_range_from_user 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 revoke_range_from_user. 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.
revoke_range_from_user 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.