Capture content from multiple panes
AI agents call capture-panes 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 terminal session content from tmux panes without altering state, executing commands, or producing side effects. It is a pure read operation that queries existing data. No data is created, modified, deleted, or executed.
From the tool's definition Tool name 'capture-panes' and description 'Capture content from multiple panes' indicate data retrieval without modification. The verb 'capture' in this context means to extract or read pane contents, similar to screenshotting terminal output.
Attacks that exploit this kind of access
Capture content from multiple panes. 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 capture-panes: 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.
capture-panes 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-panes 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-panes. 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-panes 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.
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