get_group

THE RISK

Low Risk

Why get_group needs a policy

This tool retrieves group information and member lists. It performs a query operation that does not create, modify, delete, or execute any operations. The action is purely informational and read-only, making it the lowest risk category.

From the tool's definition Tool name 'get_group' and description 'Get details for a specific group including members' indicate data retrieval with no modification or side effects.

Documented attack patterns abuse exactly the kind of access get_group gives an agent:

POLICY

How to control get_group

PolicyLayer is an MCP gateway — it sits between your AI agents and Open WebUI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_group:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_group": {}
  }
}

get_group is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Open WebUI MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_group

What does the get_group tool do? +

Get details for a specific group including members. It is categorised as a Read tool in the Open WebUI MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_group? +

Register the Open WebUI MCP Server MCP server in PolicyLayer and add a rule for get_group: 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 Open WebUI MCP Server. Nothing to install.

What risk level is get_group? +

get_group is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_group? +

Yes. Add a rate_limit block to the get_group 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.

How do I block get_group completely? +

Set action: deny in the PolicyLayer policy for get_group. 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.

What MCP server provides get_group? +

get_group is provided by the Open WebUI MCP Server MCP server (troylar/open-webui-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Open WebUI MCP Server tool call.

Start from Open WebUI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →