deleteUserLinkWithId
Remove an existing link that has been made from a 3rd party identity provider to a FusionAuth user.
This record as markdown: /tools/io-fusionauth-mcp-api/deleteuserlinkwithid.md
What deleteUserLinkWithId does on Fusionauth
AI agents call deleteUserLinkWithId 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 deleteUserLinkWithId is rated Critical
This tool permanently removes a link between a user and a third-party identity provider. Such deletion cannot be undone without manual intervention and affects user authentication capability. This is irreversible data removal (matching the Destructive definition), not merely a modification.
From the tool's definition Tool name contains 'delete' and description states 'Remove an existing link' — both indicate irreversible deletion of a user identity provider link.
Attacks that exploit this kind of access
The rule that runs deleteUserLinkWithId 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 deleteUserLinkWithId, this is the rule to start with:
deleteUserLinkWithId 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 deleteUserLinkWithId call is checked against it from then on.
Questions about deleteUserLinkWithId
Remove an existing link that has been made from a 3rd party identity provider to a FusionAuth user. 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 deleteUserLinkWithId: 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.
deleteUserLinkWithId 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 deleteUserLinkWithId 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 deleteUserLinkWithId. 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.
deleteUserLinkWithId 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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