browser_sessionstorage_list

A read tool on the Playwright MCP server.

SERVERPlaywright MCP SOURCEalialobidm/playwright-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/alialobidm-playwright-mcp/browser-sessionstorage-list.md

WHAT IT DOES

What browser_sessionstorage_list does on Playwright MCP

AI agents call browser_sessionstorage_list to retrieve information from Playwright MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why browser_sessionstorage_list is rated Low

Session storage listing retrieves browser session data for inspection—a read-only query operation with no side effects. No data is modified, deleted, or executed. While the description is empty, the tool name and the pattern of sibling operations (browser_cookie_list, etc.) clearly indicate a retrieval function.

From the tool's definition Tool name 'browser_sessionstorage_list' indicates listing/retrieving session storage data. The suffix '_list' combined with 'sessionstorage' suggests querying or enumerating stored data without modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_sessionstorage_list safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Playwright MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For browser_sessionstorage_list, this is the rule to start with:

browser_sessionstorage_list Allowed

browser_sessionstorage_list is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "browser_sessionstorage_list": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Playwright MCP, apply this rule, and every browser_sessionstorage_list call is checked against it from then on.

FAQ

Questions about browser_sessionstorage_list

What does the browser_sessionstorage_list tool do? +

browser_sessionstorage_list is a read tool on the Playwright MCP server. It is categorised as a Read tool in the Playwright MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on browser_sessionstorage_list? +

Register the Playwright MCP server in PolicyLayer and add a rule for browser_sessionstorage_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 MCP. Nothing to install.

What risk level is browser_sessionstorage_list? +

browser_sessionstorage_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit browser_sessionstorage_list? +

Yes. Add a rate_limit block to the browser_sessionstorage_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.

How do I block browser_sessionstorage_list completely? +

Set action: deny in the PolicyLayer policy for browser_sessionstorage_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.

What MCP server provides browser_sessionstorage_list? +

browser_sessionstorage_list is provided by the Playwright MCP server (alialobidm/playwright-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Playwright, and thousands of servers like it.

This server

All 59 Playwright tools →

Across the catalogue

aiva_list_affiliates on AIVA MCP Server →list_agents on 0rca Dojo MCP Server →browser_extract_text on Percepta MCP Server → The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →