AI agents call browser_verify_list_visible to retrieve information from Playwright without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The name implies a read/assertion operation — verifying that a list is visible in the browser — which would be a non-destructive check with no side effects. However, the empty description lowers confidence. Based on naming conventions in Playwright toolsets, 'verify' operations are typically read-only assertions. Severity is low as misuse would at worst return incorrect visibility state.
From the tool's definition Tool name 'browser_verify_list_visible' suggests checking visibility of a list element; no description provided to confirm behavior.
Documented attack patterns abuse exactly the kind of access browser_verify_list_visible gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Playwright, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_verify_list_visible:
{
"version": "1",
"default": "deny",
"tools": {
"browser_verify_list_visible": {}
}
}browser_verify_list_visible is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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browser_verify_list_visible. It is categorised as a Read tool in the Playwright MCP Server, which means it retrieves data without modifying state.
Register the Playwright MCP server in PolicyLayer and add a rule for browser_verify_list_visible: 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. Nothing to install.
browser_verify_list_visible 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_verify_list_visible 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_verify_list_visible. 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_verify_list_visible is provided by the Playwright MCP server (@playwright/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Playwright, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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68 Playwright tools catalogued and risk-classified — across an index of 43,000+ MCP servers.