[CUSTOM] Calls the Marketo REST API directly (not Adobe's native MCP).
AI agents call custom_delete_form_fieldset_field to permanently remove resources in Marketo MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The tool irreversibly deletes a form fieldset field from Marketo, which cannot be undone. This is a destructive operation that permanently removes configuration data. While the blast radius is limited to form field metadata (not leads or campaigns themselves), deletion of form structure could break form functionality.
From the tool's definition Tool name contains 'delete' and 'field' with capability to remove form fieldset fields from Marketo. The description indicates it calls the Marketo REST API directly to perform deletion operations on form configuration assets.
Attacks that exploit this kind of access
[CUSTOM] Calls the Marketo REST API directly (not Adobe's native MCP). It is categorised as a Destructive tool in the Marketo MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Marketo MCP Server MCP server in PolicyLayer and add a rule for custom_delete_form_fieldset_field: 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 Marketo MCP Server. Nothing to install.
custom_delete_form_fieldset_field 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 custom_delete_form_fieldset_field 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 custom_delete_form_fieldset_field. 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.
custom_delete_form_fieldset_field is provided by the Marketo MCP Server MCP server (tyron-pretorius/marketo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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