AI agents call list_tmux_sessions to retrieve information from HackerMCP 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 the state of tmux sessions (no side effects, no data modification). It falls under the Read category. However, severity is medium rather than low because in the context of a penetration testing server (HackerMCP), knowledge of active sessions could reveal ongoing offensive operations, sensitive debugging activities, or attack infrastructure—information valuable to an attacker who…
From the tool's definition Tool name 'list_tmux_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 HackerMCP MCP Server, which means it retrieves data without modifying state.
Register the Hacker 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 HackerMCP. 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 Hacker MCP server (r3versein/hackermcp). 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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