Clear cookies, localStorage, and sessionStorage for a browser session (useful for test isolation)
AI agents call session_reset_state 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.
This tool permanently clears authentication cookies, localStorage, and sessionStorage data. These deletions are irreversible within the session context and could destroy authentication state, user preferences, and cached data.
From the tool's definition 'Clear cookies, localStorage, and sessionStorage for a browser session' — irreversibly removes stored session data
Attacks that exploit this kind of access
Clear cookies, localStorage, and sessionStorage for a browser session (useful for test isolation). 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 session_reset_state: 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.
session_reset_state 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 session_reset_state 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 session_reset_state. 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.
session_reset_state 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.
session_reset_state is one line of MCP Playwright Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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