List all tmux sessions
AI agents call list-sessions to retrieve information from Ryan's 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 retrieves and enumerates tmux sessions, which is a read-only operation with no side effects. It poses minimal security risk as it only exposes information about existing sessions without enabling creation, modification, or deletion of sessions or their contents.
From the tool's definition Tool name 'list-sessions' and description 'List all tmux sessions' indicate a query operation that retrieves session information without modification.
Attacks that exploit this kind of access
List all tmux sessions. It is categorised as a Read tool in the Ryan's Tmux MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Ryan's Tmux MCP Server MCP server in PolicyLayer and add a rule for list-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 Ryan's Tmux MCP Server. Nothing to install.
list-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-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-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-sessions is provided by the Ryan's Tmux MCP Server MCP server (ryancnelson/ryan-tmux-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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