AI agents call capture_tmux_output 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 reads/captures the current output displayed in a tmux session without executing commands or modifying state. However, in the context of a penetration testing server running tools like Metasploit and Nmap, the captured output may contain sensitive data (credentials, scan results, exploit outputs), raising the severity to medium despite being a read-only operation.
From the tool's definition Capture the current output of a tmux session
Attacks that exploit this kind of access
Capture the current output of a tmux session. 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 capture_tmux_output: 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.
capture_tmux_output 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 capture_tmux_output 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 capture_tmux_output. 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.
capture_tmux_output 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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