browser_tab_list

A read tool on the Looking Glass MCP server.

SERVERLooking Glass SOURCElooking-glass-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/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-tab-list.md

WHAT IT DOES

What browser_tab_list does on Looking Glass

AI agents call browser_tab_list to retrieve information from Looking Glass 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_tab_list is rated Low

The tool lists browser tabs, which is a read operation that retrieves data about open browser state. However, the severity is elevated to 'medium' rather than 'low' because in an agent context, enumerating browser tabs could reveal sensitive information (URLs, tabs the user considers private) or be used for reconnaissance. The tool causes no direct side effects but provides information an agent could misuse.

From the tool's definition Tool name 'browser_tab_list' and server context 'AI-native browser for agents' indicate a query/list operation that retrieves browser state without modification. The description is empty, lowering confidence slightly.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_tab_list safely

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

browser_tab_list Allowed

browser_tab_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_tab_list": {}
  }
}

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

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

FAQ

Questions about browser_tab_list

What does the browser_tab_list tool do? +

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

How do I enforce a policy on browser_tab_list? +

Register the Looking Glass MCP server in PolicyLayer and add a rule for browser_tab_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 Looking Glass. Nothing to install.

What risk level is browser_tab_list? +

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

Can I rate-limit browser_tab_list? +

Yes. Add a rate_limit block to the browser_tab_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_tab_list completely? +

Set action: deny in the PolicyLayer policy for browser_tab_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_tab_list? +

browser_tab_list is provided by the Looking Glass MCP server (looking-glass-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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