List emails in a specific folder with pagination. Shows sender, subject, date, and read status. Results are newest first.
AI agents call proton_list_emails to retrieve information from Proton 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 and displays email metadata from a specified folder. It performs no write, delete, execute, or financial operations. While the Proton server as a whole includes destructive tools (proton_delete_email) and write tools (proton_send_email, proton_reply_email), this specific tool is purely informational, making it a Read category risk with low severity.
From the tool's definition Tool lists emails with pagination, showing sender, subject, date, and read status—a retrieval operation with no data modification. The description explicitly indicates it displays metadata without side effects.
Attacks that exploit this kind of access
List emails in a specific folder with pagination. Shows sender, subject, date, and read status. Results are newest first. It is categorised as a Read tool in the Proton MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Proton MCP Server MCP server in PolicyLayer and add a rule for proton_list_emails: 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 Proton MCP Server. Nothing to install.
proton_list_emails 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 proton_list_emails 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 proton_list_emails. 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.
proton_list_emails is provided by the Proton MCP Server MCP server (sugar-crash-studios/proton-mcp-server). 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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