send_messenger_marketing_message
Send a PAID marketing message on Messenger to opted-in subscribers (Meta act_<AD>/messages). A campaign created in the last ~hour answers 2300012 then 2300041 (Meta still preparing it) with the seconds left; prefer an existing campaign from list_messenger_marketing_campaigns. One message per subs...
This record as markdown: /tools/hermoso/send-messenger-marketing-message.md
What send_messenger_marketing_message does on Hermoso
AI agents use send_messenger_marketing_message 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.
Why send_messenger_marketing_message is rated Medium
An AI agent can call send_messenger_marketing_message 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
The rule that runs send_messenger_marketing_message 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 send_messenger_marketing_message, this is the rule to start with:
send_messenger_marketing_message 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Hermoso, apply this rule, and every send_messenger_marketing_message call is checked against it from then on.
Questions about send_messenger_marketing_message
Send a PAID marketing message on Messenger to opted-in subscribers (Meta act_<AD>/messages). A campaign created in the last ~hour answers 2300012 then 2300041 (Meta still preparing it) with the seconds left; prefer an existing campaign from list_messenger_marketing_campaigns. One message per subscriber per 12 hours — Meta’s rule, enforced before dispatch and by Meta. message.type: text | button (text + up to 3 web_url buttons) | generic (a card: title, subtitle, image, tap-through url, up to 3 buttons) | media (imageUrl or videoId + buttons). Give subscriptionTokens (≤200 per call, from list_messenger_subscribers) OR customAudienceId of a MESSENGER_SUBSCRIBER_LIST audience of 100+ people for a bulk send. Meta bills the ad account per delivered message. A successful send means ACCEPTED, not delivered: read sent / delivered / read / clicked / failed per tracking id with get_messenger_marketing_message_status (Meta pushes them on the Page webhook; the Page must be subscribed with subscribe_meta_webhooks fields [. 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.
Register the Hermoso MCP server in PolicyLayer and add a rule for send_messenger_marketing_message: 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.
send_messenger_marketing_message is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the send_messenger_marketing_message 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 send_messenger_marketing_message. 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.
send_messenger_marketing_message 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.
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