get_performance_metrics

Get detailed performance metrics and resource timing. Returns: Comprehensive performance analysis

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-performance-metrics.md

WHAT IT DOES

What get_performance_metrics does on Chrome Devtools

AI agents call get_performance_metrics 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_performance_metrics is rated Low

This tool queries and retrieves performance data from the Chrome DevTools Protocol without modifying state, executing code, or affecting system resources. While it operates within a browser debugging context (Chrome DevTools), getting performance metrics is purely observational and read-only. No data is created, modified, deleted, or financial operations are involved.

From the tool's definition Tool name and description indicate retrieval of performance metrics and resource timing data: 'Get detailed performance metrics and resource timing' with return of 'Comprehensive performance analysis'.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_performance_metrics 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_performance_metrics, this is the rule to start with:

get_performance_metrics Allowed

get_performance_metrics 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_performance_metrics": {}
  }
}

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_performance_metrics call is checked against it from then on.

FAQ

Questions about get_performance_metrics

What does the get_performance_metrics tool do? +

Get detailed performance metrics and resource timing. Returns: Comprehensive performance analysis. 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_performance_metrics? +

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

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

Can I rate-limit get_performance_metrics? +

Yes. Add a rate_limit block to the get_performance_metrics 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_performance_metrics completely? +

Set action: deny in the PolicyLayer policy for get_performance_metrics. 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_performance_metrics? +

get_performance_metrics 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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