AI agents call health-check to retrieve information from Apple Mail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Health check tools typically perform read-only diagnostic operations to verify system status. No evidence of side effects, data modification, deletion, code execution, or financial impact. The empty description lowers confidence slightly, but the conventional semantics of 'health-check' indicate a non-destructive monitoring function.
From the tool's definition Tool name 'health-check' with empty description suggests a status verification utility. Given the server context (Apple Mail MCP), this likely queries the health/availability status of the mail system without modifying data.
Documented attack patterns abuse exactly the kind of access health-check gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Apple Mail, and nothing reaches the server without passing your rules. This is the rule we recommend for health-check:
{
"version": "1",
"default": "deny",
"tools": {
"health-check": {}
}
}health-check is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
health-check. It is categorised as a Read tool in the Apple Mail MCP Server, which means it retrieves data without modifying state.
Register the Apple Mail MCP server in PolicyLayer and add a rule for health-check: 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 Apple Mail. Nothing to install.
health-check 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-check 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-check. 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-check is provided by the Apple Mail MCP server (sweetrb/apple-mail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 40 Apple Mail tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
40 Apple Mail tools catalogued and risk-classified — across an index of 42,500+ MCP servers.