Assign range access to a user. Args: user_id: User ID to assign range access to range_id: Range ID to assign Returns: Assignment result
AI agents use assign_range_to_user to create or update resources in Ludus FastMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ludus FastMCP environment.
This tool creates or modifies a user's access permissions to a range resource—a reversible Write operation. The severity is medium because improper assignment could grant unauthorized access to sensitive cyber range environments, but the action is reversible (access can be revoked).
From the tool's definition Tool name 'assign_range_to_user' and description state it 'Assign range access to a user' by accepting user_id and range_id parameters. This creates or modifies access control assignments.
Documented attack patterns abuse exactly the kind of access assign_range_to_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 assign_range_to_user:
{
"version": "1",
"default": "deny",
"tools": {
"assign_range_to_user": {
"limits": [
{
"counter": "assign_range_to_user_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}assign_range_to_user stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Assign range access to a user. Args: user_id: User ID to assign range access to range_id: Range ID to assign Returns: Assignment result. It is categorised as a Write tool in the Ludus FastMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ludus Fast MCP server in PolicyLayer and add a rule for assign_range_to_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.
assign_range_to_user is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the assign_range_to_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 assign_range_to_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.
assign_range_to_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.