get_matched_styles

SERVERChrome Devtools SOURCEbenjaminr/chrome-devtools-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/benjaminr-chrome-devtools-mcp/get-matched-styles.md

WHAT IT DOES

What get_matched_styles does on Chrome Devtools

AI agents call get_matched_styles 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.

RISK

Why get_matched_styles is rated Low

This tool retrieves CSS style information for a DOM element. It queries and returns data about matching CSS rules, cascade properties, and inheritance—all read-only operations with no side effects. While it operates in a browser context via Chrome DevTools Protocol, it does not execute code, modify state, delete data, or trigger external operations.

From the tool's definition Tool name is 'get_matched_styles' and description states it 'Get comprehensive style information' and 'Returns: Complete style analysis'.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_matched_styles 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_matched_styles, this is the rule to start with:

get_matched_styles Allowed

get_matched_styles is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_matched_styles": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Chrome Devtools, apply this rule, and every get_matched_styles call is checked against it from then on.

FAQ

Questions about get_matched_styles

What does the get_matched_styles tool do? +

Get comprehensive style information including all CSS rules matching a DOM element. Args: node_id: Node ID of the element Returns: Complete style analysis including cascade, inheritance, and pseudo-elements. It is categorised as a Read tool in the Chrome Devtools MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_matched_styles? +

Register the Chrome Devtools MCP server in PolicyLayer and add a rule for get_matched_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 Chrome Devtools. Nothing to install.

What risk level is get_matched_styles? +

get_matched_styles is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_matched_styles? +

Yes. Add a rate_limit block to the get_matched_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.

How do I block get_matched_styles completely? +

Set action: deny in the PolicyLayer policy for get_matched_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.

What MCP server provides get_matched_styles? +

get_matched_styles 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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