get_background_colors
Get background colors and font information for a DOM element. Args: node_id: Node ID of the element Returns: Background colors, computed font size, and font weight
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What get_background_colors does on Chrome Devtools
AI agents call get_background_colors to retrieve information from Chrome Devtools without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why get_background_colors is rated Low
This is a straightforward Read operation that queries computed style properties of a DOM element. It has no side effects—it merely retrieves styling information without modifying the DOM, executing code, or triggering external operations. The low severity reflects minimal blast radius if misused; an agent could extract styling data but cannot harm data or systems.
From the tool's definition Tool retrieves styling information (background colors, font size, font weight) from a DOM element via its node_id. Description explicitly states it 'Get[s]' and 'Returns' computed style data with no mention of modification, deletion, or command execution.
Attacks that exploit this kind of access
The rule that runs get_background_colors safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Chrome Devtools, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_background_colors, this is the rule to start with:
get_background_colors is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Chrome Devtools, apply this rule, and every get_background_colors call is checked against it from then on.
Questions about get_background_colors
Get background colors and font information for a DOM element. Args: node_id: Node ID of the element Returns: Background colors, computed font size, and font weight. It is categorised as a Read tool in the Chrome Devtools MCP Server, which means it retrieves data without modifying state.
Register the Chrome Devtools MCP server in PolicyLayer and add a rule for get_background_colors: 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 Chrome Devtools. Nothing to install.
get_background_colors 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_background_colors 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_background_colors. 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_background_colors is provided by the Chrome Devtools MCP server (benjaminr/chrome-devtools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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