get_app_perf_metrics

ServerAsc
CategoryRead

WHAT IT DOES

What get_app_perf_metrics does on Asc

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

THE RISK

Low Risk

Why get_app_perf_metrics needs a policy

This tool retrieves pre-computed performance and power metrics (launch time, memory, battery, hangs) for apps in aggregate form. It is a read-only query operation that returns existing analytics data without side effects. No data is created, modified, deleted, or executed.

From the tool's definition Tool description specifies "Get performance and power metrics" which is a retrieval operation. It "Returns Xcode-style metrics data" with no indication of modification, deletion, or execution of code. The data retrieved is historical performance analytics.

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

POLICY

How to control get_app_perf_metrics

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

policy.json

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

get_app_perf_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 Asc — 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 →

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EXPLORE

Related tools and policies

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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_app_perf_metrics

What does the get_app_perf_metrics tool do? +

Get performance and power metrics for an app (e.g., launch time, memory, battery, hangs). Returns Xcode-style metrics data with values per device and percentile. Use this for app-level aggregate metrics across all builds. It is categorised as a Read tool in the Asc MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_app_perf_metrics? +

Register the Asc MCP server in PolicyLayer and add a rule for get_app_perf_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 Asc. Nothing to install.

What risk level is get_app_perf_metrics? +

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

Can I rate-limit get_app_perf_metrics? +

Yes. Add a rate_limit block to the get_app_perf_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_app_perf_metrics completely? +

Set action: deny in the PolicyLayer policy for get_app_perf_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_app_perf_metrics? +

get_app_perf_metrics is provided by the Asc MCP server (asc-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Asc tool call.

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

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14 Asc tools catalogued and risk-classified — across an index of 43,000+ MCP servers.