hover · Brave Browser MCP Server MCP: Risk & Policy

WHAT IT DOES

What hover does on Brave Browser MCP Server

AI agents invoke hover to trigger actions in Brave Browser MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why hover needs a policy

Hovering is a browser action that can trigger dynamic UI effects such as menus or tooltips, which may lead to further state changes. It falls under Execute as it performs an external browser operation, though its blast radius is low since it has no direct data modification or destructive capability on its own.

From the tool's definition 'Hovers over an element. Useful for triggering tooltips or hover menus.' — triggers browser interaction/action on a page element

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

hover Rate-limited

hover stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hover": {
      "limits": [
        {
          "counter": "hover_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about hover

What does the hover tool do? +

Hovers over an element. Useful for triggering tooltips or hover menus. It is categorised as a Execute tool in the Brave Browser MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on hover? +

Register the Brave Browser MCP Server MCP server in PolicyLayer and add a rule for hover: 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 Brave Browser MCP Server. Nothing to install.

What risk level is hover? +

hover is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit hover? +

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

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

hover is provided by the Brave Browser MCP Server MCP server (slaveofgod1/brave-browser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.