AI agents call pane_list to retrieve information from Wmux without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns metadata about panes (current working directory, git branch, and other metadata) within a workspace. It has no side effects, does not modify state, execute code, or delete anything. It is a pure data retrieval operation, fitting the 'Read' category. The optional 'workspaceId' parameter is a filter for the query scope, not an executable or destructive operation.
From the tool's definition Tool name and description: 'List all panes in a workspace with CWD, git branch, and metadata.' The verb 'list' is explicitly a read-only operation that retrieves information without modification, deletion, or execution of commands.
Attacks that exploit this kind of access
List all panes in a workspace with CWD, git branch, and metadata. Omit workspaceId to list your own workspace. It is categorised as a Read tool in the Wmux MCP Server, which means it retrieves data without modifying state.
Register the Wmux MCP server in PolicyLayer and add a rule for pane_list: 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 Wmux. Nothing to install.
pane_list 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 pane_list 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 pane_list. 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.
pane_list is provided by the Wmux MCP server (openwong2kim/wmux). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
pane_list is one line of Wmux's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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