AI agents call get_current_tmux_info to retrieve information from macOS Notify MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about the current tmux session state. It performs a read-only query with no modifications, deletions, or external operations triggered. The blast radius of misuse is minimal - an attacker gains only visibility into running tmux sessions, which is informational only.
From the tool's definition Tool name and description indicate it 'Get[s] current tmux session information' - a query operation with no side effects.
Documented attack patterns abuse exactly the kind of access get_current_tmux_info gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and macOS Notify MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_current_tmux_info:
{
"version": "1",
"default": "deny",
"tools": {
"get_current_tmux_info": {}
}
}get_current_tmux_info is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get current tmux session information. It is categorised as a Read tool in the macOS Notify MCP MCP Server, which means it retrieves data without modifying state.
Register the macOS Notify MCP server in PolicyLayer and add a rule for get_current_tmux_info: 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 macOS Notify MCP. Nothing to install.
get_current_tmux_info 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 get_current_tmux_info 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 get_current_tmux_info. 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.
get_current_tmux_info is provided by the macOS Notify MCP server (yuki-yano/macos-notify-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from macOS Notify MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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3 macOS Notify MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.