Close a browser page
Risk signalsCloses pages losing unsaved state
Part of the Chrome DevTools server.
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AI agents may call close_page to permanently remove or destroy resources in Chrome DevTools. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. PolicyLayer blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call close_page in a loop, permanently destroying resources in Chrome DevTools. There is no undo for destructive operations. PolicyLayer blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
{
"version": "1",
"default": "deny",
"hide": [
"close_page"
]
}See the full Chrome DevTools policy for all 29 tools.
These attack patterns abuse exactly the kind of access close_page gives an agent. Each links to the full case and the policy that stops it:
Other destructive tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Close a browser page. It is categorised as a Destructive tool in the Chrome DevTools MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Chrome DevTools MCP server in PolicyLayer and add a rule for close_page: 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 Chrome DevTools. Nothing to install.
close_page is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the close_page 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 close_page. 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.
close_page is provided by the Chrome DevTools MCP server (ChromeDevTools/chrome-devtools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Chrome DevTools tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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