Create a new range. Args: name: Name for the new range description: Optional description for the range Returns: Created range information
AI agents use create_new_range 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 new cyber range environments, which are reversible write operations (ranges can be removed/deleted). The creation of computational infrastructure has a high blast radius if misused by an AI agent—it could spawn unwanted resources, consume costs, or clutter the environment—but the action itself is not irreversible (ranges can be torn down).
From the tool's definition Tool name 'create_new_range' and description 'Create a new range' indicate the tool creates new infrastructure/environment resources.
Documented attack patterns abuse exactly the kind of access create_new_range 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 create_new_range:
{
"version": "1",
"default": "deny",
"tools": {
"create_new_range": {
"limits": [
{
"counter": "create_new_range_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_new_range 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.
Free to start. No card required.
Create a new range. Args: name: Name for the new range description: Optional description for the range Returns: Created range information. 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 create_new_range: 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.
create_new_range 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 create_new_range 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 create_new_range. 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.
create_new_range 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.