List all active inboxes for this account.
AI agents call list_inboxes to retrieve information from Lobstermail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves inbox metadata without creating, modifying, deleting, or executing actions. It is a straightforward data query operation with no destructive, financial, or execution implications. The blast radius of misuse is minimal—an attacker could enumerate inboxes but cannot compromise email content or perform other harmful actions with this tool alone.
From the tool's definition Tool name 'list_inboxes' and description 'List all active inboxes for this account' indicate a query operation that retrieves data without modification or side effects.
Attacks that exploit this kind of access
List all active inboxes for this account. It is categorised as a Read tool in the Lobstermail MCP Server, which means it retrieves data without modifying state.
Register the Lobstermail MCP server in PolicyLayer and add a rule for list_inboxes: 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 Lobstermail. Nothing to install.
list_inboxes 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_inboxes 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_inboxes. 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_inboxes is provided by the Lobstermail MCP server (lobster-kit/mcp-server-lobstermail). 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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