AI agents call search_messages 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 queries data from the iMessage database without creating, modifying, or deleting any information. It is a straightforward read operation that searches existing message content. The low severity reflects the limited blast radius—an agent could extract sensitive message content but cannot take destructive or financial actions.
From the tool's definition Tool description states "Substring-search message text across all chats (case-insensitive)". Server description explicitly labels this as "Read-only MCP server". The tool performs a search/query operation with no modifications or side effects.
Attacks that exploit this kind of access
Substring-search message text across all chats (case-insensitive). 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 search_messages: 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.
search_messages 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 search_messages 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 search_messages. 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.
search_messages 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.
search_messages is one line of Imessage's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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