AI agents call browser_sessionstorage_delete to permanently remove resources in Playwright — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The tool name 'browser_sessionstorage_delete' indicates it deletes session storage data, which cannot be undone. Session storage is browser state that may be critical to application functionality or user data. This is a destructive operation (not merely Write) because deletion is irreversible.
From the tool's definition Tool name contains 'delete' and operates on session storage, an irreversible data destruction operation. Description is empty, limiting confidence slightly.
Documented attack patterns abuse exactly the kind of access browser_sessionstorage_delete gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Playwright, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_sessionstorage_delete:
{
"version": "1",
"default": "deny",
"hide": [
"browser_sessionstorage_delete"
]
}browser_sessionstorage_delete disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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browser_sessionstorage_delete. It is categorised as a Destructive tool in the Playwright MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Playwright MCP server in PolicyLayer and add a rule for browser_sessionstorage_delete: 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 Playwright. Nothing to install.
browser_sessionstorage_delete 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_sessionstorage_delete 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_sessionstorage_delete. 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_sessionstorage_delete is provided by the Playwright MCP server (@playwright/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Playwright, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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68 Playwright tools catalogued and risk-classified — across an index of 43,000+ MCP servers.