browser_localstorage_list
A read tool on the Playwright MCP server.
This record as markdown: /tools/hanato238-playwright-mcp/browser-localstorage-list.md
What browser_localstorage_list does on Playwright
AI agents call browser_localstorage_list to retrieve information from Playwright without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why browser_localstorage_list is rated Low
This tool retrieves or enumerates local storage entries without modifying them. It has no side effects and poses minimal risk—the data returned is already accessible to any script running in the browser context. Classified as Read with low severity due to limited blast radius and no capability to alter state.
From the tool's definition Tool name 'browser_localstorage_list' indicates a listing/retrieval operation on browser local storage. The '_list' suffix consistently denotes read-only enumeration operations across the sibling tool set (browser_cookie_list, etc.).
Attacks that exploit this kind of access
The rule that runs browser_localstorage_list 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_list, this is the rule to start with:
browser_localstorage_list is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Playwright, apply this rule, and every browser_localstorage_list call is checked against it from then on.
Questions about browser_localstorage_list
browser_localstorage_list is a read tool on the Playwright MCP server. It is categorised as a Read tool in the Playwright MCP Server, which means it retrieves data without modifying state.
Register the Playwright MCP server in PolicyLayer and add a rule for browser_localstorage_list: 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_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the browser_localstorage_list 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_list. 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_list 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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