Find an element by CSS selector, piercing shadow DOM boundaries.
AI agents call browser_shadow_query 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 performs element discovery and inspection within a browser's DOM (including shadow DOM), which is a read-only operation. It does not execute scripts, trigger navigation, modify data, delete content, or move financial resources.
From the tool's definition The tool 'browser_shadow_query' is described as 'Find an element by CSS selector, piercing shadow DOM boundaries.' This is fundamentally a query operation that retrieves/locates elements without modifying state or triggering side effects.
Documented attack patterns abuse exactly the kind of access browser_shadow_query 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_shadow_query:
{
"version": "1",
"default": "deny",
"tools": {
"browser_shadow_query": {}
}
}browser_shadow_query is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Find an element by CSS selector, piercing shadow DOM boundaries. 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_shadow_query: 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_shadow_query 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_shadow_query 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_shadow_query. 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_shadow_query 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.
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148 Termux Browser Pilot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.