get_computed_style

A read tool on the Playwright MCP server.

SERVERPlaywright MCP Server SOURCEalexrwilliam/playwright-mcp-server

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/alexrwilliam-playwright-mcp-server/get-computed-style.md

WHAT IT DOES

What get_computed_style does on Playwright MCP Server

AI agents call get_computed_style to retrieve information from Playwright MCP Server 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_computed_style is rated Low

The tool retrieves computed CSS styles from the page, which is purely informational with no side effects. It fits the 'Read' category as it queries data (styles) without modifying state, executing arbitrary code, or performing destructive actions. The empty description increases confidence only moderately, but the name itself is sufficiently clear and unambiguous.

From the tool's definition Tool name 'get_computed_style' indicates retrieval of CSS computed style information from DOM elements. This is a read-only operation that queries the browser's style state without modifying or executing code.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_computed_style safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Playwright MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_computed_style, this is the rule to start with:

get_computed_style Allowed

get_computed_style 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_computed_style": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect Playwright MCP Server, apply this rule, and every get_computed_style call is checked against it from then on.

FAQ

Questions about get_computed_style

What does the get_computed_style tool do? +

get_computed_style is a read tool on the Playwright MCP Server MCP server. It is categorised as a Read tool in the Playwright MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_computed_style? +

Register the Playwright MCP Server MCP server in PolicyLayer and add a rule for get_computed_style: 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 Playwright MCP Server. Nothing to install.

What risk level is get_computed_style? +

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

Can I rate-limit get_computed_style? +

Yes. Add a rate_limit block to the get_computed_style 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_computed_style completely? +

Set action: deny in the PolicyLayer policy for get_computed_style. 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_computed_style? +

get_computed_style is provided by the Playwright MCP Server MCP server (alexrwilliam/playwright-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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