Retrieve multiple messages by their UIDs. Auto-connects if not already connected.
AI agents call get_messages 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 email message data based on UIDs without creating, modifying, or deleting anything. It is purely a read operation. Severity is medium rather than low because email content can be sensitive (passwords, personal information, financial details), and an AI agent with unconstrained access could leak private messages. However, the tool itself has no destructive capability—it only reads data.
From the tool's definition Tool name 'get_messages' and description 'Retrieve multiple messages by their UIDs' indicate a query operation that fetches data without modification. The capability to auto-connect is a convenience feature, not a side effect on the messages themselves.
Attacks that exploit this kind of access
Retrieve multiple messages by their UIDs. 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 get_messages: 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.
get_messages 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_messages 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_messages. 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_messages 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.
Teams ship this data inside their own products. See what a licence covers →