AI agents call domain.email-security to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a domain security grading, which is fundamentally a read operation—it queries and returns information about a domain's email security status. No data is created, modified, deleted, or executed. The pay-per-call settlement mechanism on this MCP server is a billing detail, not indicative of the tool's capabilities.
From the tool's definition Tool name 'domain.email-security' and description 'Grade a domain' indicate a query/assessment operation that retrieves or evaluates security characteristics of a domain without modifying or executing operations.
Attacks that exploit this kind of access
Grade a domain. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for domain.email-security: 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. Nothing to install.
domain.email-security 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 domain.email-security 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 domain.email-security. 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.
domain.email-security is provided by the MCP server (@2sio/mcp). 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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