AI agents call list_chats to retrieve information from Imessage without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves chat metadata (list of conversations) without creating, modifying, or deleting any data. It has no side effects and presents no capability for misuse beyond exposing existing message metadata to the AI agent. While iMessage data is personal, the read-only nature and lack of side effects make this a low-severity Read operation.
From the tool's definition Tool description explicitly states 'read-only MCP server' and 'list_chats' retrieves and lists iMessage chats sorted by recent activity with no modification capabilities.
Attacks that exploit this kind of access
List iMessage chats sorted by most recent activity. It is categorised as a Read tool in the Imessage MCP Server, which means it retrieves data without modifying state.
Register the Imessage MCP server in PolicyLayer and add a rule for list_chats: 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 Imessage. Nothing to install.
list_chats 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_chats 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_chats. 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_chats is provided by the Imessage MCP server (jaredmoskowitz/imessage-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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