Update a group's name or description. ADMIN ONLY.
AI agents use update_group to create or update resources in Open WebUI MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Open WebUI MCP Server environment.
This tool creates or modifies group data (name/description) without deleting it, placing it in the Write category. Severity is high because unauthorized updates to group metadata in a multi-user admin system could disrupt user organization, group coordination, or access controls if an AI agent misuses elevated administrative privileges.
From the tool's definition Tool performs an update operation on group data: 'Update a group's name or description.' This modifies group metadata reversibly. The ADMIN ONLY restriction indicates privileged access to a multi-user system resource.
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access update_group gives an agent:
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 update_group:
{
"version": "1",
"default": "deny",
"tools": {
"update_group": {
"limits": [
{
"counter": "update_group_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_group 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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Update a group's name or description. ADMIN ONLY. It is categorised as a Write tool in the Open WebUI MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Open WebUI MCP Server MCP server in PolicyLayer and add a rule for update_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.
update_group 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 update_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.
Set action: deny in the PolicyLayer policy for update_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.
update_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.
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.
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82 Open WebUI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.