Show parent-child relationships for a specific element in the DOM tree
AI agents call get_element_hierarchy 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 queries and retrieves DOM hierarchy data—a read-only operation with no side effects. It enables inspection of page structure for debugging and accessibility purposes, which is the intended use case described in the server's function. There is minimal risk of misuse; an AI agent cannot cause harm by inspecting DOM relationships.
From the tool's definition Tool name 'get_element_hierarchy' and description 'Show parent-child relationships for a specific element in the DOM tree' indicate retrieval of structural information from the DOM without modification, deletion, or execution of code.
Attacks that exploit this kind of access
Show parent-child relationships for a specific element in the DOM tree. 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_element_hierarchy: 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_element_hierarchy 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_element_hierarchy 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_element_hierarchy. 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_element_hierarchy 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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