Extract all colors (text, background, border) used on the page with usage counts
AI agents call get_color_palette 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 passive inspection of DOM styles and computed properties to catalog color usage. It has no capability to modify page state, execute code, delete data, or trigger external side effects. The operation is purely informational—querying existing visual properties of rendered elements. This aligns with the Read category: retrieves styling data with no side effects.
From the tool's definition Tool extracts and reports color information from a webpage with usage counts. The verb 'extract' and 'get' indicate data retrieval without modification. Description specifies it retrieves styling information (text, background, border colors) used on the page.
Attacks that exploit this kind of access
Extract all colors (text, background, border) used on the page with usage counts. 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_color_palette: 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_color_palette 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_color_palette 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_color_palette. 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_color_palette 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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