stop_render_highlight · React Native MCP: Risk & Policy

WHAT IT DOES

What stop_render_highlight does on React Native

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

WHY IT NEEDS A POLICY

Why stop_render_highlight needs a policy

This tool modifies the UI state by removing visual overlays and resetting internal counters. It is reversible (highlights can be re-applied) and has no destructive, financial, or code-execution implications. The blast radius is minimal — it only affects a debug/monitoring overlay in the app.

From the tool's definition Stop React component render overlay. Removes highlight rects and resets counts.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stop_render_highlight Rate-limited

stop_render_highlight 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": {
    "stop_render_highlight": {
      "limits": [
        {
          "counter": "stop_render_highlight_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches React Native, so you can run agents against it safely.

FAQ

Questions about stop_render_highlight

What does the stop_render_highlight tool do? +

Stop React component render overlay. Removes highlight rects and resets counts. It is categorised as a Write tool in the React Native MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on stop_render_highlight? +

Register the React Native MCP server in PolicyLayer and add a rule for stop_render_highlight: 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 React Native. Nothing to install.

What risk level is stop_render_highlight? +

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

Can I rate-limit stop_render_highlight? +

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

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

stop_render_highlight is provided by the React Native MCP server (@ohah/react-native-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.