AI agents call browser_extract_text 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 reads and transforms rendered webpage content into markdown format. It performs data retrieval (extracting text) without creating, modifying, deleting, or executing actions. The operation is non-destructive and produces no side effects beyond passive content extraction. Severity is low because extraction of public/visible web content poses minimal risk even if misused by an agent.
From the tool's definition Tool name 'browser_extract_text' and description 'Extract page content as clean markdown text, stripping navigation and noise' indicate retrieval of visible page content with no modification or side effects.
Attacks that exploit this kind of access
Extract page content as clean markdown text, stripping navigation and noise. 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 browser_extract_text: 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.
browser_extract_text 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 browser_extract_text 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 browser_extract_text. 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.
browser_extract_text 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.
browser_extract_text 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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