Retrieve information about all currently open browser tabs, including their URLs, titles, and active status. This tool provides a comprehensive overview of the browser session state.
AI agents call browser_tab_list to retrieve information from MCP Macaco Playwright without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and reports metadata about open browser tabs (URLs, titles, active status). It performs no modifications, deletions, code execution, or financial operations. It is purely informational, making it a Read category tool with low severity risk—an AI agent cannot cause harm by retrieving this information.
From the tool's definition Tool name 'browser_tab_list' and description 'Retrieve information about all currently open browser tabs, including their URLs, titles, and active status.' indicate querying/retrieving data with no side effects.
Attacks that exploit this kind of access
Retrieve information about all currently open browser tabs, including their URLs, titles, and active status. This tool provides a comprehensive overview of the browser session state. It is categorised as a Read tool in the MCP Macaco Playwright MCP Server, which means it retrieves data without modifying state.
Register the MCP Macaco Playwright MCP server in PolicyLayer and add a rule for browser_tab_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 MCP Macaco Playwright. Nothing to install.
browser_tab_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 browser_tab_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 browser_tab_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.
browser_tab_list is provided by the MCP Macaco Playwright MCP server (macacoai/mcp-playwright). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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