update_promo_rule

A write tool on the Mailchimp MCP server.

SERVERMailchimp MCP SOURCEdamientilman/mailchimp-mcp-server

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/damientilman-mailchimp-mcp-server/update-promo-rule.md

WHAT IT DOES

What update_promo_rule does on Mailchimp MCP

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

RISK

Why update_promo_rule is rated Medium

The tool appears to update (modify) promotional rules within Mailchimp, which is reversible and changes configuration/marketing data but does not delete, execute code, or move money. The empty description lowers confidence slightly, but the name and server context strongly suggest a Write operation.

From the tool's definition Tool name 'update_promo_rule' indicates modification of promotional rules; sibling tools on Mailchimp MCP include create_campaign, create_audience, and batch_subscribe, establishing this as a data-modification context.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_promo_rule safely

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

update_promo_rule Rate-limited

update_promo_rule 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": {
    "update_promo_rule": {
      "limits": [
        {
          "counter": "update_promo_rule_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 Mailchimp MCP, apply this rule, and every update_promo_rule call is checked against it from then on.

FAQ

Questions about update_promo_rule

What does the update_promo_rule tool do? +

update_promo_rule is a write tool on the Mailchimp MCP server. It is categorised as a Write tool in the Mailchimp MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_promo_rule? +

Register the Mailchimp MCP server in PolicyLayer and add a rule for update_promo_rule: 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 Mailchimp MCP. Nothing to install.

What risk level is update_promo_rule? +

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

Can I rate-limit update_promo_rule? +

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

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

update_promo_rule is provided by the Mailchimp MCP server (damientilman/mailchimp-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Mailchimp, and thousands of servers like it.

This server

All 227 Mailchimp tools →

Across the catalogue

aroflo_create_or_update_record on AroFlo MCP →team_manager_update_budget on Team Manager MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →