deleteGroupMembersWithId
Removes users as members of a group.
This record as markdown: /tools/io-fusionauth-mcp-api/deletegroupmemberswithid.md
What deleteGroupMembersWithId does on Fusionauth
AI agents call deleteGroupMembersWithId to permanently remove resources in Fusionauth, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why deleteGroupMembersWithId is rated Critical
The tool performs an irreversible action (deletion of group membership relationships). While not deleting user records themselves, removing group memberships cannot be undone and alters organizational access control state. This qualifies as Destructive rather than Write because membership changes are not easily reversible by the user and represent loss of access/authorization state.
From the tool's definition Tool name includes 'delete' and description states 'Removes users as members of a group' — this is an irreversible removal of group membership associations.
Attacks that exploit this kind of access
The rule that runs deleteGroupMembersWithId 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 deleteGroupMembersWithId, this is the rule to start with:
deleteGroupMembersWithId is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every deleteGroupMembersWithId call is checked against it from then on.
Questions about deleteGroupMembersWithId
Removes users as members of a group. It is categorised as a Destructive tool in the Fusionauth MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Fusionauth MCP server in PolicyLayer and add a rule for deleteGroupMembersWithId: 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.
deleteGroupMembersWithId is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the deleteGroupMembersWithId 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 deleteGroupMembersWithId. 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.
deleteGroupMembersWithId 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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