browser_sessionstorage_get
A read tool on the Playwright MCP server.
This record as markdown: /tools/hanato238-playwright-mcp/browser-sessionstorage-get.md
What browser_sessionstorage_get does on Playwright
AI agents call browser_sessionstorage_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_sessionstorage_get is rated Low
This tool retrieves session storage data from a browser context without modifying or deleting it. Session storage access is a read-only operation with minimal blast radius—it may expose stored data but cannot alter application state, trigger side effects, or cause damage. The empty description lowers confidence slightly, but the naming convention and sibling tool patterns strongly indicate a Read classification.
From the tool's definition Tool name 'browser_sessionstorage_get' explicitly indicates retrieval ('get') of session storage data; description is empty but context from sibling tools (browser_cookie_get, browser_cookie_list) that perform read operations confirms this pattern.
Attacks that exploit this kind of access
The rule that runs browser_sessionstorage_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_sessionstorage_get, this is the rule to start with:
browser_sessionstorage_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_sessionstorage_get call is checked against it from then on.
Questions about browser_sessionstorage_get
browser_sessionstorage_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_sessionstorage_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_sessionstorage_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_sessionstorage_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_sessionstorage_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_sessionstorage_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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