performance_get_metrics

Get page performance metrics.

SERVERJshookmcp SOURCE@jshookmcp/jshook

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/io-github-vmoranv-jshookmcp/performance-get-metrics.md

WHAT IT DOES

What performance_get_metrics does on Jshookmcp

AI agents call performance_get_metrics to retrieve information from Jshookmcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why performance_get_metrics is rated Low

Retrieves read-only performance data from a page; no side effects.

From the tool's definition Get page performance metrics

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs performance_get_metrics safely

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

performance_get_metrics Allowed

performance_get_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": {
    "performance_get_metrics": {}
  }
}

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

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

FAQ

Questions about performance_get_metrics

What does the performance_get_metrics tool do? +

Get page performance metrics. It is categorised as a Read tool in the Jshookmcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on performance_get_metrics? +

Register the Jshook MCP server in PolicyLayer and add a rule for performance_get_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 Jshookmcp. Nothing to install.

What risk level is performance_get_metrics? +

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

Can I rate-limit performance_get_metrics? +

Yes. Add a rate_limit block to the performance_get_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 performance_get_metrics completely? +

Set action: deny in the PolicyLayer policy for performance_get_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 performance_get_metrics? +

performance_get_metrics is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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