update-member-group · Mcp Dev MCP: Risk & Policy

WHAT IT DOES

What update-member-group does on Mcp Dev

AI agents use update-member-group to create or update resources in Mcp Dev — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Dev environment.

WHY IT NEEDS A POLICY

Why update-member-group needs a policy

This tool modifies data (member group configuration) in a reversible manner. It does not delete data (Destructive), execute arbitrary code (Execute), or handle financial transactions (Financial). However, depending on what member group properties can be updated (e.g., permissions, access levels), there is a moderate blast radius if an AI agent misconfigures groups and affects multiple users' access or roles.

From the tool's definition Tool name 'update-member-group' and description 'Updates a member group by Id' indicate modification of existing data in the Umbraco CMS member group system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update-member-group Rate-limited

update-member-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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update-member-group": {
      "limits": [
        {
          "counter": "update-member-group_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Dev, so you can run agents against it safely.

FAQ

Questions about update-member-group

What does the update-member-group tool do? +

Updates a member group by Id. It is categorised as a Write tool in the Mcp Dev MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update-member-group? +

Register the Mcp Dev MCP server in PolicyLayer and add a rule for update-member-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 Mcp Dev. Nothing to install.

What risk level is update-member-group? +

update-member-group is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit update-member-group? +

Yes. Add a rate_limit block to the update-member-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 update-member-group completely? +

Set action: deny in the PolicyLayer policy for update-member-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 update-member-group? +

update-member-group is provided by the Mcp Dev MCP server (@umbraco-cms/mcp-dev). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.