Search unreplied messages from a specific sender with optional date range. Identifies messages that have not been replied to by checking for corresponding reply messages. Auto-connects if not already connected.
AI agents call search_unreplied_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 retrieves and queries email data based on sender and reply status criteria. It has no side effects - it does not modify, delete, or execute actions on messages. The search and identification functions are read-only operations. While email content can be sensitive, the risk is standard for mail access tools without destructive or operational capabilities.
From the tool's definition Tool description states it 'search[es] unreplied messages' and 'identifies messages' - pure querying/retrieval operations with no modification, deletion, or execution. The tool auto-connects but performs only message searching and identification.
Attacks that exploit this kind of access
Search unreplied messages from a specific sender with optional date range. Identifies messages that have not been replied to by checking for corresponding reply messages. 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_unreplied_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_unreplied_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_unreplied_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_unreplied_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_unreplied_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.
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