List email folders/labels for an account
AI agents call list_folders to retrieve information from Mail Cal Drive without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates existing email folder structures without creating, modifying, or deleting data. It has no side effects and poses minimal risk even if called repeatedly or against unintended accounts, as it only exposes information already accessible to an authenticated user. The blast radius of misuse is limited to information disclosure.
From the tool's definition Tool name is 'list_folders' and description states 'List email folders/labels for an account' — a pure query operation with no modification or execution.
Attacks that exploit this kind of access
List email folders/labels for an account. It is categorised as a Read tool in the Mail Cal Drive MCP Server, which means it retrieves data without modifying state.
Register the Mail Cal Drive MCP server in PolicyLayer and add a rule for 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 Mail Cal Drive. Nothing to install.
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 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 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.
list_folders is provided by the Mail Cal Drive MCP server (rumbitopi/mail-cal-drive-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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