Get the full DOM tree structure of the connected page with semantic analysis
AI agents call get_dom_tree to retrieve information from Mcp Browser Lens without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries the DOM structure of a web page—a passive read operation that returns information about the page's HTML structure and semantic content. It has no side effects, does not execute code or commands, does not modify data, and does not delete or move resources. The semantic analysis is analytical only.
From the tool's definition Tool name 'get_dom_tree' and description 'Get the full DOM tree structure of the connected page with semantic analysis' indicate data retrieval with no modification or execution of external operations.
Attacks that exploit this kind of access
Get the full DOM tree structure of the connected page with semantic analysis. It is categorised as a Read tool in the Mcp Browser Lens MCP Server, which means it retrieves data without modifying state.
Register the Mcp Browser Lens MCP server in PolicyLayer and add a rule for get_dom_tree: 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 Mcp Browser Lens. Nothing to install.
get_dom_tree 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 get_dom_tree 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 get_dom_tree. 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.
get_dom_tree is provided by the Mcp Browser Lens MCP server (nano-step/mcp-browser-lens). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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