custom_add_custom_activities · Marketo MCP Server MCP

WHAT IT DOES

What custom_add_custom_activities does on Marketo MCP Server

AI agents use custom_add_custom_activities 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.

WHY IT NEEDS A POLICY

Why custom_add_custom_activities needs a policy

The tool name structure 'custom_add_custom_activities' follows the pattern of adding/creating new data entries. In the Marketo context (managing leads, activities, emails, campaigns), adding custom activities would modify the activity log and tracking records. This is reversible (can be deleted/corrected), so Write rather than Destructive.

From the tool's definition Tool name 'custom_add_custom_activities' indicates creation/addition of custom activity records. The prefix 'add' suggests Write semantics (creates new data). Description is empty, limiting certainty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

custom_add_custom_activities Rate-limited

custom_add_custom_activities 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": {
    "custom_add_custom_activities": {
      "limits": [
        {
          "counter": "custom_add_custom_activities_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Marketo MCP Server, so you can run agents against it safely.

FAQ

Questions about custom_add_custom_activities

What does the custom_add_custom_activities tool do? +

custom_add_custom_activities. 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 custom_add_custom_activities? +

Register the Marketo MCP Server MCP server in PolicyLayer and add a rule for custom_add_custom_activities: 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 custom_add_custom_activities? +

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

Can I rate-limit custom_add_custom_activities? +

Yes. Add a rate_limit block to the custom_add_custom_activities 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 custom_add_custom_activities completely? +

Set action: deny in the PolicyLayer policy for custom_add_custom_activities. 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 custom_add_custom_activities? +

custom_add_custom_activities 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.