Clear all cookies from the browser context, or clear specific cookies by name, domain, or path.
AI agents call cookies_clear to permanently remove resources in MCP Playwright Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Clearing cookies is a destructive operation because it irreversibly removes browser state including session cookies, authentication tokens, and preferences. While the blast radius is limited to the browser context (not external systems), it can break active sessions and cannot be undone without re-authentication or re-establishment of state.
From the tool's definition 'Clear all cookies from the browser context' - clearing cookies is an irreversible action that destroys session data, authentication tokens, and stored state
Attacks that exploit this kind of access
Clear all cookies from the browser context, or clear specific cookies by name, domain, or path. It is categorised as a Destructive tool in the MCP Playwright Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the MCP Playwright Server MCP server in PolicyLayer and add a rule for cookies_clear: 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 Playwright Server. Nothing to install.
cookies_clear 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 cookies_clear 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 cookies_clear. 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.
cookies_clear is provided by the MCP Playwright Server MCP server (j0hanz/playwright-mcp). 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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