Get a single mail filter by ID.
AI agents call get_mail_rule to retrieve information from TrekMail 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 or queries a single mail filter rule by its identifier. It performs a read-only operation with no capability to modify, delete, or execute actions. The 'get' verb and retrieve-focused description are consistent with the Read category. Severity is low because retrieving mail filter configuration data poses minimal risk even if misused by an agent.
From the tool's definition Tool name is 'get_mail_rule' and description states 'Get a single mail filter by ID' — both indicate a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Get a single mail filter by ID. It is categorised as a Read tool in the TrekMail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the TrekMail MCP Server MCP server in PolicyLayer and add a rule for get_mail_rule: 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 TrekMail MCP Server. Nothing to install.
get_mail_rule 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_mail_rule 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_mail_rule. 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_mail_rule is provided by the TrekMail MCP Server MCP server (trekmail/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_mail_rule is one line of TrekMail MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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