[CUSTOM] Calls the Marketo REST API directly (not Adobe's native MCP).
AI agents call custom_get_named_account_fields to retrieve information from Marketo MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about named account fields in Marketo without creating, modifying, or deleting any data. It has no side effects and serves a lookup/query purpose. The sibling tools on this server include write/execute operations (activate_smart_campaign, approve_email_program, clone_program, create_smart_campaign), but this specific tool is clearly a read operation.
From the tool's definition Tool name 'custom_get_named_account_fields' contains 'get', indicating data retrieval. Description explicitly states it 'Calls the Marketo REST API directly' to fetch named account field definitions—a read-only operation with no modification or deletion of…
Attacks that exploit this kind of access
[CUSTOM] Calls the Marketo REST API directly (not Adobe's native MCP). It is categorised as a Read tool in the Marketo MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Marketo MCP Server MCP server in PolicyLayer and add a rule for custom_get_named_account_fields: 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_get_named_account_fields is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the custom_get_named_account_fields 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_get_named_account_fields. 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_get_named_account_fields 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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