deleteFormFieldWithId
Deletes the form field for the given Id.
This record as markdown: /tools/io-fusionauth-mcp-api/deleteformfieldwithid.md
What deleteFormFieldWithId does on Fusionauth
AI agents call deleteFormFieldWithId 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 deleteFormFieldWithId is rated Critical
The tool permanently removes a form field by ID with no undo mechanism. This is a destructive operation that cannot be reversed, making it more severe than Write operations. The high severity reflects that deleting form fields could break application functionality if the operation is triggered on wrong IDs, though the blast radius is somewhat limited to form configuration rather than user data or financial systems.
From the tool's definition Tool name explicitly states "delete" and description confirms "Deletes the form field for the given Id" — this is an irreversible removal of data.
Attacks that exploit this kind of access
The rule that runs deleteFormFieldWithId 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 deleteFormFieldWithId, this is the rule to start with:
deleteFormFieldWithId 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 deleteFormFieldWithId call is checked against it from then on.
Questions about deleteFormFieldWithId
Deletes the form field for the given Id. 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 deleteFormFieldWithId: 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.
deleteFormFieldWithId 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 deleteFormFieldWithId 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 deleteFormFieldWithId. 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.
deleteFormFieldWithId 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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