[CUSTOM] Calls the Marketo REST API directly (not Adobe's native MCP).
AI agents call custom_discard_email_draft 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.
Discarding a draft is an irreversible action — the draft content is permanently lost and cannot be recovered. The tool calls the Marketo REST API directly, bypassing any native safeguards. While drafts are not published assets, the destruction of work-in-progress content qualifies as Destructive. Confidence is slightly reduced because the description is sparse and does not fully detail the scope of the operation.
From the tool's definition 'discard_email_draft' — discarding a draft irreversibly removes the draft content; combined with '[CUSTOM] Calls the Marketo REST API directly' indicating direct API execution without additional safeguards
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_discard_email_draft: 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_discard_email_draft 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_discard_email_draft 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_discard_email_draft. 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_discard_email_draft 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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