get_list_tab

Get list tab (tab id, url, title, status, favIconUrl) about the currently active browser tab

SERVERBrowser SOURCEmcp-server-browser

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/browser/get-list-tab.md

WHAT IT DOES

What get_list_tab does on Browser

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

RISK

Why get_list_tab is rated Low

This tool retrieves metadata about browser tabs without modifying state, executing code, or triggering side effects. It is a passive read operation analogous to listing or querying data, fitting the Read category. Severity is low since exposed tab metadata poses minimal risk even if misused by an agent — at worst an agent learns which tabs are open.

From the tool's definition Tool description states it 'Get[s] list tab (tab id, url, title, status, favIconUrl) about the currently active browser tab' — purely retrieves information with no modification or execution.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_list_tab safely

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

get_list_tab Allowed

get_list_tab 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": {
    "get_list_tab": {}
  }
}

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

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

FAQ

Questions about get_list_tab

What does the get_list_tab tool do? +

Get list tab (tab id, url, title, status, favIconUrl) about the currently active browser tab. It is categorised as a Read tool in the Browser MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_list_tab? +

Register the Browser MCP server in PolicyLayer and add a rule for get_list_tab: 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 Browser. Nothing to install.

What risk level is get_list_tab? +

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

Can I rate-limit get_list_tab? +

Yes. Add a rate_limit block to the get_list_tab 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 get_list_tab completely? +

Set action: deny in the PolicyLayer policy for get_list_tab. 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 get_list_tab? +

get_list_tab is provided by the Browser MCP server (mcp-server-browser). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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