List all sending domains (Sidemail API)
AI agents call list-domains to retrieve information from Sidemail 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 enumerates sending domains configured in Sidemail but does not create, modify, delete, or execute any operations. The blast radius of misuse is minimal—an attacker gains visibility into domain configuration but cannot alter email infrastructure or send unauthorized emails. Classified as Read with low severity.
From the tool's definition Tool name 'list-domains' and description 'List all sending domains' indicate a retrieval operation with no side effects. The verb 'list' is a classic read operation that queries existing data without modification.
Attacks that exploit this kind of access
List all sending domains (Sidemail API). It is categorised as a Read tool in the Sidemail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Sidemail MCP Server MCP server in PolicyLayer and add a rule for list-domains: 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 Sidemail MCP Server. Nothing to install.
list-domains 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 list-domains 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 list-domains. 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.
list-domains is provided by the Sidemail MCP Server MCP server (sidemail/sidemail-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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