Create a new user group. Args: name (str): Name for the user group. users (list, optional): Users to add initially. Returns: dict: Creation outcome.
AI agents use create_usergroup to create or update resources in GeoServer MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your GeoServer MCP Server environment.
This tool creates a new user group, which is a reversible write operation. It modifies the access control or organizational structure of the GeoServer system but does not delete data or execute arbitrary code. The severity is medium because improper user group creation could affect authorization scoping and system access, but the operation itself is non-destructive and can be undone.
From the tool's definition Tool name is 'create_usergroup' and description states 'Create a new user group' with parameters for name and optional users list. This is a write operation that creates a new entity (user group) in the system.
Documented attack patterns abuse exactly the kind of access create_usergroup gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and GeoServer MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_usergroup:
{
"version": "1",
"default": "deny",
"tools": {
"create_usergroup": {
"limits": [
{
"counter": "create_usergroup_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_usergroup 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 a new user group. Args: name (str): Name for the user group. users (list, optional): Users to add initially. Returns: dict: Creation outcome. It is categorised as a Write tool in the GeoServer MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the GeoServer MCP Server MCP server in PolicyLayer and add a rule for create_usergroup: 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 GeoServer MCP Server. Nothing to install.
create_usergroup 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_usergroup 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_usergroup. 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_usergroup is provided by the GeoServer MCP Server MCP server (mahdin75/geoserver-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from GeoServer MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
56 GeoServer MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.