List all active tmux sessions
AI agents call list_tmux_sessions to retrieve information from Tmux MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation that queries the state of tmux sessions. It has no side effects, does not execute commands, does not modify data, and does not delete or create resources. It is purely informational retrieval, fitting the Read category. Severity is low as the blast radius of listing sessions is minimal—an AI agent cannot cause harm by discovering what sessions exist.
From the tool's definition Tool name 'list_tmux_sessions' and description 'List all active tmux sessions' indicate a query operation that retrieves information about existing sessions without modifying or executing any commands.
Attacks that exploit this kind of access
List all active tmux sessions. It is categorised as a Read tool in the Tmux MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Tmux MCP Server MCP server in PolicyLayer and add a rule for list_tmux_sessions: 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 Tmux MCP Server. Nothing to install.
list_tmux_sessions 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_tmux_sessions 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_tmux_sessions. 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_tmux_sessions is provided by the Tmux MCP Server MCP server (rinadelph/tmux-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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