list_tabs

List currently connected browser tabs/sessions.

SERVERAgent Browser SOURCE335234131/agent-browser-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/335234131-agent-browser-mcp/list-tabs.md

WHAT IT DOES

What list_tabs does on Agent Browser

AI agents call list_tabs to retrieve information from Agent 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 list_tabs is rated Low

This tool retrieves information about active browser tabs and sessions without altering state. However, the context that this server controls a real Chrome browser with full access to login sessions, cookies, and sensitive data elevates the severity from 'low' to 'medium'—unauthorized enumeration of tabs could reveal which services a user is logged into or sensitive information visible in open pages, creating…

From the tool's definition Tool name 'list_tabs' and description 'List currently connected browser tabs/sessions' indicate a query/retrieval operation with no modification or destructive action.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_tabs safely

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

list_tabs Allowed

list_tabs 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": {
    "list_tabs": {}
  }
}

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

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

FAQ

Questions about list_tabs

What does the list_tabs tool do? +

List currently connected browser tabs/sessions. It is categorised as a Read tool in the Agent Browser MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_tabs? +

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

What risk level is list_tabs? +

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

Can I rate-limit list_tabs? +

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

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

list_tabs is provided by the Agent Browser MCP server (335234131/agent-browser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Agent Browser, and thousands of servers like it.

This server

All 20 Agent Browser tools →

Across the catalogue

list_symbols on ACE-MCP →aiva_list_affiliates on AIVA MCP Server → The MCP Attack Database →

Guides

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