AI agents call browser_tab_list to retrieve information from Playwright MCP with Electron Support without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a straightforward enumeration of browser tabs—a read-only information retrieval operation. It has no capability to modify state, execute commands, delete data, or trigger external operations. The blast radius of misuse is minimal; an attacker could only learn which tabs are open, which is low sensitivity information in most contexts.
From the tool's definition Tool name 'browser_tab_list' and description 'List browser tabs' indicate a query operation that retrieves information about open browser tabs without modifying, executing code, or causing side effects.
Documented attack patterns abuse exactly the kind of access browser_tab_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Playwright MCP with Electron Support, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_tab_list:
{
"version": "1",
"default": "deny",
"tools": {
"browser_tab_list": {}
}
}browser_tab_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List browser tabs. It is categorised as a Read tool in the Playwright MCP with Electron Support MCP Server, which means it retrieves data without modifying state.
Register the Playwright MCP with Electron Support 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 Playwright MCP with Electron Support. 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 Playwright MCP with Electron Support MCP server (robertn702/playwright-mcp-electron). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Playwright MCP with Electron Support, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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34 Playwright MCP with Electron Support tools catalogued and risk-classified — across an index of 43,000+ MCP servers.