List all address books with id, name, description, sortOrder, isDefault, and isSubscribed.
AI agents call contacts_list_address_books to retrieve information from Pyfastmail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns metadata about existing address books. It performs no writes, deletes, executions, or financial operations. The information returned (IDs, names, descriptions, sorting order, subscription status) is configuration metadata with no side effects. This is a classic Read operation—data retrieval with no impact on system state.
From the tool's definition Tool name 'contacts_list_address_books' and description 'List all address books with id, name, description, sortOrder, isDefault, and isSubscribed' indicate retrieval/enumeration of existing data without modification or deletion.
Attacks that exploit this kind of access
List all address books with id, name, description, sortOrder, isDefault, and isSubscribed. It is categorised as a Read tool in the Pyfastmail MCP Server, which means it retrieves data without modifying state.
Register the Pyfastmail MCP server in PolicyLayer and add a rule for contacts_list_address_books: 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 Pyfastmail. Nothing to install.
contacts_list_address_books 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 contacts_list_address_books 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 contacts_list_address_books. 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.
contacts_list_address_books is provided by the Pyfastmail MCP server (pjosols/pyfastmail-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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