AI agents call browser_list_sessions to retrieve information from MCProxy without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query operation that returns metadata about existing browser sessions. It retrieves information such as browser type, IP address, geographic location, and timezone without creating, modifying, deleting, or executing any actions. The worst-case misuse scenario (an agent learning about available sessions) poses minimal risk compared to browser control tools on this server.
From the tool's definition "List all active browser sessions with their browser type and location info" - retrieves session metadata without modifying or triggering external operations.
Attacks that exploit this kind of access
List all active browser sessions with their browser type and location info (IP, city, region/state, country, timezone). Use this to find sessions by geographic location (e.g.,. It is categorised as a Read tool in the MCProxy MCP Server, which means it retrieves data without modifying state.
Register the MCProxy MCP server in PolicyLayer and add a rule for browser_list_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 MCProxy. Nothing to install.
browser_list_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 browser_list_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 browser_list_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.
browser_list_sessions is provided by the MCProxy MCP server (saladtechnologies/mcproxy). 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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