Get viewport dimensions, device pixel ratio, active media queries, and breakpoint status
AI agents call get_responsive_info 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 only queries and returns information about the responsive design state of a web page. It performs no writes, deletions, code execution, or financial operations. The data retrieved is non-sensitive page metadata used for design and debugging purposes. Misuse by an AI agent would be limited to gathering information without causing harm.
From the tool's definition Tool retrieves viewport dimensions, device pixel ratio, active media queries, and breakpoint status—all read-only queries of the current page state with no modification or side effects.
Attacks that exploit this kind of access
Get viewport dimensions, device pixel ratio, active media queries, and breakpoint status. 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_responsive_info: 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_responsive_info 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_responsive_info 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_responsive_info. 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_responsive_info 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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