Delete all browser cookies.
AI agents call delete_cookies to permanently remove resources in SeleniumMCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool irreversibly removes all browser cookies, which cannot be undone. Session tokens, authentication cookies, and stored preferences are permanently destroyed. While the blast radius is limited to browser state (not server-side data), the action is irreversible within the session context, warranting a Destructive classification at medium severity.
From the tool's definition Delete all browser cookies
Attacks that exploit this kind of access
Delete all browser cookies. It is categorised as a Destructive tool in the SeleniumMCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Selenium MCP server in PolicyLayer and add a rule for delete_cookies: 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 SeleniumMCP. Nothing to install.
delete_cookies 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 delete_cookies 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 delete_cookies. 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.
delete_cookies is provided by the Selenium MCP server (lokii0911/seleniummcp). 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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