get_element_box_model

Get the box model (layout information) of a DOM element. Args: node_id: Node ID of the element Returns: Box model data including content, padding, border, and margin boxes

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-element-box-model.md

WHAT IT DOES

What get_element_box_model does on Chrome Devtools

AI agents call get_element_box_model 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_element_box_model is rated Low

This tool retrieves layout metadata (content, padding, border, margin boxes) from a DOM element without side effects. It performs a query operation with no capability to modify, execute, or delete anything. The minimal scope (layout information only) and read-only semantics classify it as Read with low severity.

From the tool's definition Tool description states it 'Get[s] the box model (layout information) of a DOM element' and 'Returns: Box model data'. The verb 'Get' and return-only nature with no modification described indicate pure data retrieval.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_element_box_model 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_element_box_model, this is the rule to start with:

get_element_box_model Allowed

get_element_box_model 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_element_box_model": {}
  }
}

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_element_box_model call is checked against it from then on.

FAQ

Questions about get_element_box_model

What does the get_element_box_model tool do? +

Get the box model (layout information) of a DOM element. Args: node_id: Node ID of the element Returns: Box model data including content, padding, border, and margin boxes. 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_element_box_model? +

Register the Chrome Devtools MCP server in PolicyLayer and add a rule for get_element_box_model: 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_element_box_model? +

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

Can I rate-limit get_element_box_model? +

Yes. Add a rate_limit block to the get_element_box_model 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_element_box_model completely? +

Set action: deny in the PolicyLayer policy for get_element_box_model. 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_element_box_model? +

get_element_box_model 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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