List all mail folders (IMAP-like folder tree) for the MailPlus account.
AI agents call mailplus_list_folders to retrieve information from Synology Office without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns existing mail folder structures without creating, modifying, deleting, or executing any operations. It is purely informational. The blast radius of misuse is minimal — an attacker gains visibility into email folder organization but cannot access message contents, delete folders, or affect other systems. Confidence is high because the description is explicit and unambiguous.
From the tool's definition Tool description states 'List all mail folders' — a retrieval operation with no modification or side effects. Naming convention 'list_' and 'folders' further confirm read-only enumeration.
Documented attack patterns abuse exactly the kind of access mailplus_list_folders gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Synology Office, and nothing reaches the server without passing your rules. This is the rule we recommend for mailplus_list_folders:
{
"version": "1",
"default": "deny",
"tools": {
"mailplus_list_folders": {}
}
}mailplus_list_folders is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all mail folders (IMAP-like folder tree) for the MailPlus account. It is categorised as a Read tool in the Synology Office MCP Server, which means it retrieves data without modifying state.
Register the Synology Office MCP server in PolicyLayer and add a rule for mailplus_list_folders: 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 Synology Office. Nothing to install.
mailplus_list_folders 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 mailplus_list_folders 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 mailplus_list_folders. 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.
mailplus_list_folders is provided by the Synology Office MCP server (vocweb/synology-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Synology Office, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
39 Synology Office tools catalogued and risk-classified — across an index of 43,000+ MCP servers.