AI agents call list_email_addresses to retrieve information from Agentline without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about provisioned email addresses without modifying, deleting, or executing any operations. It is a read-only query operation with minimal blast radius even if misused by an agent—viewing account metadata poses no immediate harm compared to tools that provision, release, or interact with communication channels.
From the tool's definition Tool name 'list_email_addresses' and description 'List all email addresses currently provisioned on this account' indicate a query/retrieval operation with no side effects.
Attacks that exploit this kind of access
List all email addresses currently provisioned on this account. It is categorised as a Read tool in the Agentline MCP Server, which means it retrieves data without modifying state.
Register the Agentline MCP server in PolicyLayer and add a rule for list_email_addresses: 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 Agentline. Nothing to install.
list_email_addresses 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_email_addresses 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_email_addresses. 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_email_addresses is provided by the Agentline MCP server (jgottlieb84/agentline-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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