Search unread messages from a specific sender with optional date range (demonstrates AND logic). Auto-connects if not already connected.
AI agents call search_unread_from_sender to retrieve information from Mcp Mail Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool searches and retrieves email messages based on sender and read status criteria. It is a read-only operation that queries existing data with optional filtering by date range. No data is created, modified, deleted, or destroyed. The presence of 'auto-connects if not already connected' is a prerequisite action that does not change the classification.
From the tool's definition Tool description states 'Search unread messages from a specific sender' — a query operation that retrieves data without modification. The tool performs filtering and retrieval only, with no create, modify, or delete operations.
Attacks that exploit this kind of access
Search unread messages from a specific sender with optional date range (demonstrates AND logic). Auto-connects if not already connected. It is categorised as a Read tool in the Mcp Mail Server MCP Server, which means it retrieves data without modifying state.
Register the Mcp Mail Server MCP server in PolicyLayer and add a rule for search_unread_from_sender: 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 Mcp Mail Server. Nothing to install.
search_unread_from_sender 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 search_unread_from_sender 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 search_unread_from_sender. 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.
search_unread_from_sender is provided by the Mcp Mail Server MCP server (mcp-mail-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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