AI agents use create_custom_template 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 data artifacts (templates) within the system that can be reused for scenario deployment. Creation is reversible (templates can be deleted or modified), placing it in Write rather than Destructive. Severity is high because maliciously created templates could be deployed across multiple ranges, affecting many security testing scenarios.
From the tool's definition Tool name 'create_custom_template' combined with server context describing 'template creation' as a core capability. The tool enables creation of new templates within the Ludus cyber range platform.
Documented attack patterns abuse exactly the kind of access create_custom_template 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_custom_template:
{
"version": "1",
"default": "deny",
"tools": {
"create_custom_template": {
"limits": [
{
"counter": "create_custom_template_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_custom_template 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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create_custom_template. 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_custom_template: 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_custom_template 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_custom_template 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_custom_template. 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_custom_template 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.