estimate_meta_reach

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/estimate-meta-reach.md

WHAT IT DOES

What estimate_meta_reach does on Hermoso

AI agents use estimate_meta_reach 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 estimate_meta_reach is rated Medium

An AI agent can call estimate_meta_reach 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 estimate_meta_reach 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 estimate_meta_reach, this is the rule to start with:

estimate_meta_reach Rate-limited

estimate_meta_reach 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": {
    "estimate_meta_reach": {
      "limits": [
        {
          "counter": "estimate_meta_reach_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 estimate_meta_reach call is checked against it from then on.

FAQ

Questions about estimate_meta_reach

What does the estimate_meta_reach tool do? +

Ask Meta how many people a targeting spec can actually reach — BEFORE any budget is committed. Two ways: pass adSetId to size an ad set you already built (Meta uses its own saved targeting), or pass the same. 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 estimate_meta_reach? +

Register the Hermoso MCP server in PolicyLayer and add a rule for estimate_meta_reach: 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 estimate_meta_reach? +

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

Can I rate-limit estimate_meta_reach? +

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

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

estimate_meta_reach 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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