createGroupMembersWithId

Creates a member in a group.

SERVERFusionauth SOURCE@fusionauth/mcp-api

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-fusionauth-mcp-api/creategroupmemberswithid.md

WHAT IT DOES

What createGroupMembersWithId does on Fusionauth

AI agents use createGroupMembersWithId to create or update resources in Fusionauth, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fusionauth environment.

RISK

Why createGroupMembersWithId is rated Medium

This tool creates or adds a new group member, which is a reversible modification to group membership data. It does not delete, execute code, or create financial obligations. The severity is medium because unauthorized group membership changes could grant inappropriate access or permissions, but the effect is limited in scope to a single membership relationship and can be remedied by removal.

From the tool's definition Tool name contains 'create' and description states 'Creates a member in a group,' indicating it adds new data to a group membership structure.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs createGroupMembersWithId safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Fusionauth, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For createGroupMembersWithId, this is the rule to start with:

createGroupMembersWithId Rate-limited

createGroupMembersWithId 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": {
    "createGroupMembersWithId": {
      "limits": [
        {
          "counter": "creategroupmemberswithid_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every createGroupMembersWithId call is checked against it from then on.

FAQ

Questions about createGroupMembersWithId

What does the createGroupMembersWithId tool do? +

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

How do I enforce a policy on createGroupMembersWithId? +

Register the Fusionauth MCP server in PolicyLayer and add a rule for createGroupMembersWithId: 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 Fusionauth. Nothing to install.

What risk level is createGroupMembersWithId? +

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

Can I rate-limit createGroupMembersWithId? +

Yes. Add a rate_limit block to the createGroupMembersWithId 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 createGroupMembersWithId completely? +

Set action: deny in the PolicyLayer policy for createGroupMembersWithId. 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 createGroupMembersWithId? +

createGroupMembersWithId is provided by the Fusionauth MCP server (@fusionauth/mcp-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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