Clear all cookies in the current browser context.
AI agents call browser.clear_cookies to permanently remove resources in MCP Playwright Browser — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Clearing all cookies is irreversible within the session — once deleted, the cookies cannot be recovered. This could cause session loss, logout from sites, and loss of authentication state. It permanently removes stored data, making it Destructive. Severity is medium because the blast radius is limited to the current browser session/context rather than affecting external systems or persistent storage.
From the tool's definition Clear all cookies in the current browser context
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
Clear all cookies in the current browser context. It is categorised as a Destructive tool in the MCP Playwright Browser MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the MCP Playwright Browser MCP server in PolicyLayer and add a rule for browser.clear_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 MCP Playwright Browser. Nothing to install.
browser.clear_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 browser.clear_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 browser.clear_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.
browser.clear_cookies is provided by the MCP Playwright Browser MCP server (mhrnqaruni/mcp-playwright-browser). 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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