list_contacts
AI agents call list_contacts to retrieve information from MCP Agent Mail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool's name indicates a simple enumeration/listing function, which is a read-only operation that retrieves contact data without modifying it. Despite the empty description lowering confidence slightly, the naming convention and server purpose (coordination and information management rather than execution) strongly suggest this returns contact information without side effects.
From the tool's definition Tool name 'list_contacts' clearly indicates a data retrieval operation. The empty description provides no contrary evidence suggesting side effects or destructive capabilities.
Attacks that exploit this kind of access
list_contacts. It is categorised as a Read tool in the MCP Agent Mail MCP Server, which means it retrieves data without modifying state.
Register the MCP Agent Mail MCP server in PolicyLayer and add a rule for list_contacts: 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 Agent Mail. Nothing to install.
list_contacts 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_contacts 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_contacts. 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_contacts is provided by the MCP Agent Mail MCP server (omelchmichael/mcp_agent_mail). 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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