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 and displays metadata about existing iMessage conversations without modifying, deleting, or executing any operations. It is a straightforward query operation. The read-only nature of the server and the retrieval-only semantics confirm Read category. Severity is low because exposure would only leak chat conversation metadata, not message content or sensitive operations.
From the tool's definition Tool name 'list_chats' combined with description 'List the most recent iMessage conversations' and server description stating 'Read-only MCP server'. The action is retrieval with no side effects.
Attacks that exploit this kind of access
List the most recent iMessage conversations. 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 (moritzhwnr/imessage-cli). 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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