AI agents call list-accounts 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.
The tool lists email accounts, which is a retrieval operation with no side effects. It does not create, modify, delete, or execute any actions—it simply enumerates existing accounts. This is a low-severity read operation, as account enumeration alone poses minimal risk compared to the destructive and write operations available on this server (batch-delete-messages, delete-mailbox, etc.).
From the tool's definition Tool name 'list-accounts' and context from server description indicating this MCP server 'allows AI assistants to read, send, search, and manage emails in Apple Mail on macOS.' The tool name and its sibling operations suggest this retrieves account…
Documented attack patterns abuse exactly the kind of access list-accounts 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 list-accounts:
{
"version": "1",
"default": "deny",
"tools": {
"list-accounts": {}
}
}list-accounts is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list-accounts. 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 list-accounts: 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.
list-accounts 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 list-accounts 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 list-accounts. 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.
list-accounts 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.
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40 Apple Mail tools catalogued and risk-classified — across an index of 42,500+ MCP servers.