Get element position and dimensions via getBoundingClientRect.
AI agents call browser_bounding_box to retrieve information from Termux Browser Pilot without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the browser DOM to extract geometric information about an element's bounding box. It performs information retrieval only and cannot modify, execute, or destructively alter state. The operation is purely observational and safe for security purposes.
From the tool's definition Tool retrieves element position and dimensions using getBoundingClientRect, which is a read-only DOM query method that returns an object with no side effects.
Documented attack patterns abuse exactly the kind of access browser_bounding_box gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Termux Browser Pilot, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_bounding_box:
{
"version": "1",
"default": "deny",
"tools": {
"browser_bounding_box": {}
}
}browser_bounding_box is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get element position and dimensions via getBoundingClientRect. It is categorised as a Read tool in the Termux Browser Pilot MCP Server, which means it retrieves data without modifying state.
Register the Termux Browser Pilot MCP server in PolicyLayer and add a rule for browser_bounding_box: 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 Termux Browser Pilot. Nothing to install.
browser_bounding_box is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the browser_bounding_box 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 browser_bounding_box. 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.
browser_bounding_box is provided by the Termux Browser Pilot MCP server (salviz/termux-browser-pilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Termux Browser Pilot, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
148 Termux Browser Pilot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.