health.read_range_metrics

THE RISK

Low Risk

Why health.read_range_metrics needs a policy

This tool queries and retrieves health metrics data over a date range without any side effects. The operation is read-only, non-destructive, and returns data only (including reporting missing dates as informational output). No data is created, modified, deleted, or executed. This is a straightforward data retrieval use case with minimal risk even if misused by an agent.

From the tool's definition Tool name includes 'read' and description states 'Read a date range of exported daily metrics' — explicit retrieval operation with no modification or deletion capability.

Documented attack patterns abuse exactly the kind of access health.read_range_metrics gives an agent:

POLICY

How to control health.read_range_metrics

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "health.read_range_metrics": {}
  }
}

health.read_range_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 Nucleus Apple — 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

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All 30 Nucleus Apple 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 health.read_range_metrics

What does the health.read_range_metrics tool do? +

Read a date range of exported daily metrics using monthly indexes. Missing dates are reported, not treated as an error. It is categorised as a Read tool in the Nucleus Apple MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on health.read_range_metrics? +

Register the Nucleus Apple MCP server in PolicyLayer and add a rule for health.read_range_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 Nucleus Apple. Nothing to install.

What risk level is health.read_range_metrics? +

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

Can I rate-limit health.read_range_metrics? +

Yes. Add a rate_limit block to the health.read_range_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 health.read_range_metrics completely? +

Set action: deny in the PolicyLayer policy for health.read_range_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 health.read_range_metrics? +

health.read_range_metrics is provided by the Nucleus Apple MCP server (zish-rob-crur/nucleus-apple-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Nucleus Apple tool call.

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

CHECK YOUR STACK →