Get all computed CSS styles for a specific element including applied classes and matched rules
AI agents call get_computed_styles 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 performs a read-only operation that queries and returns CSS styling information from the DOM. It retrieves computed properties without altering any page state, data, or functionality. The action is purely informational and reversible by nature. No code execution, data modification, or destructive operations are involved.
From the tool's definition Tool name 'get_computed_styles' and description 'Get all computed CSS styles for a specific element including applied classes and matched rules' indicate retrieval of style information with no modification or side effects.
Attacks that exploit this kind of access
Get all computed CSS styles for a specific element including applied classes and matched rules. 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_computed_styles: 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_computed_styles 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_computed_styles 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_computed_styles. 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_computed_styles 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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