get_performance_metrics

THE RISK

Low Risk

Why get_performance_metrics needs a policy

This tool fetches and analyzes performance data from existing test results. It performs no creation, modification, deletion, code execution, or financial operations. The analysis is computational but operates on already-captured metrics data. The impact of misuse is limited to information disclosure of test performance data, which poses minimal risk in a development/testing context.

From the tool's definition Tool name is 'get_performance_metrics' and description states it 'Retrieves and analyzes performance metrics from test results' — uses the verb 'retrieves' which indicates data query without modification.

Documented attack patterns abuse exactly the kind of access get_performance_metrics gives an agent:

POLICY

How to control get_performance_metrics

PolicyLayer is an MCP gateway — it sits between your AI agents and MockLoop MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_performance_metrics:

policy.json

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

get_performance_metrics is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register MockLoop MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 30 MockLoop MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_performance_metrics

What does the get_performance_metrics tool do? +

Retrieves and analyzes performance metrics from test results. It is categorised as a Read tool in the MockLoop MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_performance_metrics? +

Register the MockLoop MCP Server 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 MockLoop MCP Server. 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 MockLoop MCP Server MCP server (mockloop/mockloop-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MockLoop MCP Server tool call.

Start from MockLoop MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →