highlight_body_regions

THE RISK

Low Risk

Why highlight_body_regions needs a policy

The tool name suggests visual highlighting of body regions (likely on a dashboard UI), which could be a Write or Execute action affecting UI state. However, the existence of a sibling tool 'clear_body_highlights' implies this is a reversible UI display action. With no description to confirm, confidence is low.

From the tool's definition Tool name is 'highlight_body_regions'; description is empty and uninformative.

Documented attack patterns abuse exactly the kind of access highlight_body_regions gives an agent:

POLICY

How to control highlight_body_regions

PolicyLayer is an MCP gateway — it sits between your AI agents and MCPacer, and nothing reaches the server without passing your rules. This is the rule we recommend for highlight_body_regions:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "highlight_body_regions": {
      "limits": [
        {
          "counter": "highlight_body_regions_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

highlight_body_regions gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register MCPacer — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

SET A RULE FOR THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about highlight_body_regions

What does the highlight_body_regions tool do? +

highlight_body_regions. It is categorised as a Other tool in the MCPacer MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on highlight_body_regions? +

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

What risk level is highlight_body_regions? +

highlight_body_regions is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit highlight_body_regions? +

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

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

highlight_body_regions is provided by the MCPacer MCP server (wernerpe/mcpacer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCPacer tool call.

Start from MCPacer, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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