browser_localstorage_get
A read tool on the Playwright MCP server.
This record as markdown: /tools/hanato238-playwright-mcp/browser-localstorage-get.md
What browser_localstorage_get does on Playwright
AI agents call browser_localstorage_get 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_get is rated Low
The tool retrieves (gets) stored data from browser local storage without modifying, deleting, or executing code. The 'get' suffix confirms read-only semantics. While the empty description reduces confidence slightly, the name clearly indicates a read operation with no side effects. Sibling tools like 'browser_cookie_get' and 'browser_cookie_list' follow the same read-only pattern, supporting this classification.
From the tool's definition Tool name 'browser_localstorage_get' indicates a getter operation that retrieves local storage data from the browser; no mutation or destructive operation is implied.
Attacks that exploit this kind of access
The rule that runs browser_localstorage_get 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_get, this is the rule to start with:
browser_localstorage_get 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_get call is checked against it from then on.
Questions about browser_localstorage_get
browser_localstorage_get 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_get: 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_get 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_get 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_get. 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_get 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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