List all email folders with message counts
AI agents call get_folders to retrieve information from ProtonMail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves organizational metadata about email folders (names and message counts) with no side effects. It enables discovery of the user's email structure but does not access message contents, modify data, or trigger external operations. Classification as Read is appropriate, with low severity since folder enumeration alone poses minimal risk even if misused by an agent.
From the tool's definition Tool name 'get_folders' and description 'List all email folders with message counts' indicate retrieval of folder metadata without modification or deletion.
Attacks that exploit this kind of access
List all email folders with message counts. It is categorised as a Read tool in the ProtonMail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ProtonMail MCP Server MCP server in PolicyLayer and add a rule for get_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 ProtonMail MCP Server. Nothing to install.
get_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 get_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 get_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.
get_folders is provided by the ProtonMail MCP Server MCP server (ronamosa/protonmail-pro-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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