marketo_add_lead_to_list

Add one or more leads to a static list by list ID. Accepts an array of lead IDs. Max 300 leads per call.

SERVERMarketo MCP Server SOURCEalexleventer/marketo-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/alexleventer-marketo-mcp/marketo-add-lead-to-list.md

WHAT IT DOES

What marketo_add_lead_to_list does on Marketo MCP Server

AI agents use marketo_add_lead_to_list to create or update resources in Marketo MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Marketo MCP Server environment.

RISK

Why marketo_add_lead_to_list is rated Medium

This tool creates associations between leads and static lists, which is a reversible modification of data. It does not delete data (ruling out Destructive), does not execute arbitrary code (ruling out Execute), and does not involve financial transactions (ruling out Financial). The 'Add' action is characteristic of a Write operation.

From the tool's definition Tool description states 'Add one or more leads to a static list' - the word 'Add' indicates a create/modify operation that modifies list membership.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs marketo_add_lead_to_list safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Marketo MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For marketo_add_lead_to_list, this is the rule to start with:

marketo_add_lead_to_list Rate-limited

marketo_add_lead_to_list stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "marketo_add_lead_to_list": {
      "limits": [
        {
          "counter": "marketo_add_lead_to_list_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Marketo MCP Server, apply this rule, and every marketo_add_lead_to_list call is checked against it from then on.

FAQ

Questions about marketo_add_lead_to_list

What does the marketo_add_lead_to_list tool do? +

Add one or more leads to a static list by list ID. Accepts an array of lead IDs. Max 300 leads per call. It is categorised as a Write tool in the Marketo MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on marketo_add_lead_to_list? +

Register the Marketo MCP Server MCP server in PolicyLayer and add a rule for marketo_add_lead_to_list: 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.

What risk level is marketo_add_lead_to_list? +

marketo_add_lead_to_list is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit marketo_add_lead_to_list? +

Yes. Add a rate_limit block to the marketo_add_lead_to_list 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.

How do I block marketo_add_lead_to_list completely? +

Set action: deny in the PolicyLayer policy for marketo_add_lead_to_list. 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.

What MCP server provides marketo_add_lead_to_list? +

marketo_add_lead_to_list is provided by the Marketo MCP Server MCP server (alexleventer/marketo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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