browser_localstorage_clear
A destructive tool on the Playwright MCP server.
This record as markdown: /tools/hanato238-playwright-mcp/browser-localstorage-clear.md
What browser_localstorage_clear does on Playwright
AI agents call browser_localstorage_clear 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.
Why browser_localstorage_clear is rated Critical
Clearing local storage irreversibly deletes client-side persisted data. While the blast radius is typically limited to a single website's stored data (not system-wide), this action cannot be undone and destroys application state. This qualifies as Destructive rather than Write because local storage deletion is not reversible through normal application workflows.
From the tool's definition Tool name 'browser_localstorage_clear' indicates clearing/deletion of browser local storage data. The '_clear' suffix conventionally denotes irreversible data removal.
Attacks that exploit this kind of access
The rule that runs browser_localstorage_clear safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Playwright, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For browser_localstorage_clear, this is the rule to start with:
browser_localstorage_clear is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Playwright, apply this rule, and every browser_localstorage_clear call is checked against it from then on.
Questions about browser_localstorage_clear
browser_localstorage_clear is a destructive tool on the Playwright MCP server. 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_localstorage_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. Nothing to install.
browser_localstorage_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_localstorage_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_localstorage_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_localstorage_clear is provided by the Playwright MCP server (hanato238/playwright-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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