Search emails by sender, recipient, subject, date range, body content, or unread status. Multiple criteria are combined with AND logic.
AI agents call proton_search_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 queries email data based on specified criteria. It performs a search operation that returns matching results without creating, modifying, deleting, or executing any actions. It is a purely informational/retrieval operation, fitting the Read category definition of querying data with no side effects.
From the tool's definition Tool description explicitly states it 'Search emails by sender, recipient, subject, date range, body content, or unread status' with no mention of modification, deletion, or execution capabilities.
Attacks that exploit this kind of access
Search emails by sender, recipient, subject, date range, body content, or unread status. Multiple criteria are combined with AND logic. 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_search_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_search_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_search_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_search_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_search_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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