deleteUserRegistrationWithId
Deletes the user registration for the given user and application along with the given JSON body that contains the event information. OR Deletes the user registration for the given user and application.
This record as markdown: /tools/io-fusionauth-mcp-api/deleteuserregistrationwithid.md
What deleteUserRegistrationWithId does on Fusionauth
AI agents call deleteUserRegistrationWithId 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 deleteUserRegistrationWithId is rated Critical
This tool permanently removes a user's registration for an application. Deletion of user registrations cannot be undone and represents a destructive operation. While not as critical as account deletion (which would affect all applications), removing registration data is an irreversible modification that could lock a user out of an application and prevent recovery without administrative intervention.
From the tool's definition deleteUserRegistrationWithId - 'Deletes the user registration for the given user and application' - uses 'Deletes' which indicates irreversible removal of data.
Attacks that exploit this kind of access
The rule that runs deleteUserRegistrationWithId 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 deleteUserRegistrationWithId, this is the rule to start with:
deleteUserRegistrationWithId 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 deleteUserRegistrationWithId call is checked against it from then on.
Questions about deleteUserRegistrationWithId
Deletes the user registration for the given user and application along with the given JSON body that contains the event information. OR Deletes the user registration for the given user and application. 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 deleteUserRegistrationWithId: 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.
deleteUserRegistrationWithId 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 deleteUserRegistrationWithId 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 deleteUserRegistrationWithId. 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.
deleteUserRegistrationWithId 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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