request_messenger_optin

SERVERHermoso SOURCEhttps://app.hermoso.ai/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/hermoso/request-messenger-optin.md

WHAT IT DOES

What request_messenger_optin does on Hermoso

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

RISK

Why request_messenger_optin is rated Medium

An AI agent can call request_messenger_optin faster than any human can review: one bad instruction and it creates or modifies resources in Hermoso by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs request_messenger_optin safely

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

request_messenger_optin Rate-limited

request_messenger_optin 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": {
    "request_messenger_optin": {
      "limits": [
        {
          "counter": "request_messenger_optin_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 Hermoso, apply this rule, and every request_messenger_optin call is checked against it from then on.

FAQ

Questions about request_messenger_optin

What does the request_messenger_optin tool do? +

Send Meta’s opt-in request (the notification_messages template) to someone ALREADY in a Messenger conversation with the Page, inside the 24-hour window. If they accept, Meta posts a messaging_optin webhook with their subscription token and they appear in list_messenger_subscribers. One identical-title request per person per week. Free to send. The PSID comes from the Page inbox. It is categorised as a Write tool in the Hermoso MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on request_messenger_optin? +

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

What risk level is request_messenger_optin? +

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

Can I rate-limit request_messenger_optin? +

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

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

request_messenger_optin is provided by the Hermoso MCP server (https://app.hermoso.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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