AI agents call health.read_daily_raw to retrieve information from Nucleus Apple without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves health data for a single day from the Apple HealthKit framework. It performs a query operation with no side effects—it neither creates, modifies, deletes, nor executes external operations. The risk is minimal because it only exposes existing health data the user owns. Severity is low given the read-only nature and bounded scope (single day).
From the tool's definition Tool name 'health.read_daily_raw' and description 'Read one day' indicate retrieval of health data without modification. The verb 'read' and the absence of any mutation language confirm a Read operation.
Documented attack patterns abuse exactly the kind of access health.read_daily_raw gives an agent:
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_daily_raw:
{
"version": "1",
"default": "deny",
"tools": {
"health.read_daily_raw": {}
}
}health.read_daily_raw is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read one day. It is categorised as a Read tool in the Nucleus Apple MCP Server, which means it retrieves data without modifying state.
Register the Nucleus Apple MCP server in PolicyLayer and add a rule for health.read_daily_raw: 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.
health.read_daily_raw is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the health.read_daily_raw 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.
Set action: deny in the PolicyLayer policy for health.read_daily_raw. 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.
health.read_daily_raw 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.
Start from Nucleus Apple, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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30 Nucleus Apple tools catalogued and risk-classified — across an index of 43,000+ MCP servers.