Extract design tokens from the page: CSS variables grouped by category (colors, typography, spacing, breakpoints), font stacks, and color palette as a design system reference.
AI agents call get_design_tokens 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 reads and queries existing design system metadata (CSS custom properties, typography, spacing) from the DOM and computed styles. It has no side effects—it does not modify page state, execute arbitrary code, delete data, or trigger external operations. The purpose is informational analysis for design auditing and comparison, making it a Read category tool with low severity risk.
From the tool's definition Tool 'get_design_tokens' extracts and retrieves CSS variables, font stacks, and color palette data from a web page. Description uses 'Extract' and 'reference', indicating data retrieval with no modification, deletion, or code execution.
Attacks that exploit this kind of access
Extract design tokens from the page: CSS variables grouped by category (colors, typography, spacing, breakpoints), font stacks, and color palette as a design system reference. 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_design_tokens: 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_design_tokens 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_design_tokens 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_design_tokens. 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_design_tokens 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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