browser_sessionstorage_clear
AI agents call browser_sessionstorage_clear to permanently remove resources in Playwright MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The 'clear' suffix on a storage-related tool strongly indicates it wipes all entries from the browser's sessionStorage, which is an irreversible bulk deletion. This could destroy authentication tokens, form state, or application data that cannot be recovered. Confidence is slightly reduced due to the empty description.
From the tool's definition Tool name 'browser_sessionstorage_clear' — 'clear' implies irreversible removal of all session storage data; description is empty, so classification is based on name alone.
Attacks that exploit this kind of access
browser_sessionstorage_clear. It is categorised as a Destructive tool in the Playwright MCP 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_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 Playwright MCP. Nothing to install.
browser_sessionstorage_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 browser_sessionstorage_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 browser_sessionstorage_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.
browser_sessionstorage_clear is provided by the Playwright MCP server (naumana3services-maker/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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