List conversations whose most recent message was from the other person.
AI agents call list_unreplied to retrieve information from Imessage-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read operation that queries and retrieves conversation data. It has no side effects—it does not create, modify, delete, or execute any code. The server is explicitly read-only, and this tool simply filters and returns existing conversation metadata.
From the tool's definition Tool name 'list_unreplied' and description indicate listing/retrieving conversation metadata. Server description states 'Read-only access to imessage'.
Attacks that exploit this kind of access
List conversations whose most recent message was from the other person. It is categorised as a Read tool in the Imessage-MCP MCP Server, which means it retrieves data without modifying state.
Register the Imessage- MCP server in PolicyLayer and add a rule for list_unreplied: 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-MCP. Nothing to install.
list_unreplied 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_unreplied 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_unreplied. 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_unreplied is provided by the Imessage- MCP server (joshkaplan-dev/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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