browser_cookie_list

A read tool on the Playwright MCP server.

SERVERPlaywright SOURCEhanato238/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/hanato238-playwright-mcp/browser-cookie-list.md

WHAT IT DOES

What browser_cookie_list does on Playwright

AI agents call browser_cookie_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.

RISK

Why browser_cookie_list is rated Low

This tool retrieves a list of cookies from the browser's storage. It has no side effects—it does not modify, delete, or execute any actions. Cookie enumeration is informational only and presents low risk of misuse by an AI agent, as reading cookies typically does not cause system harm (though sensitive data may be exposed).

From the tool's definition Tool name 'browser_cookie_list' indicates a retrieval operation. The suffix '_list' in the naming pattern of the sibling tools (browser_cookie_get, browser_cookie_set, browser_cookie_delete, browser_cookie_clear) suggests this tool queries/enumerates cookies…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_cookie_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_cookie_list, this is the rule to start with:

browser_cookie_list Allowed

browser_cookie_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_cookie_list": {}
  }
}

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

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

FAQ

Questions about browser_cookie_list

What does the browser_cookie_list tool do? +

browser_cookie_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.

How do I enforce a policy on browser_cookie_list? +

Register the Playwright MCP server in PolicyLayer and add a rule for browser_cookie_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.

What risk level is browser_cookie_list? +

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

Can I rate-limit browser_cookie_list? +

Yes. Add a rate_limit block to the browser_cookie_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_cookie_list completely? +

Set action: deny in the PolicyLayer policy for browser_cookie_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_cookie_list? +

browser_cookie_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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