get_active_tab

Get information 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-active-tab.md

WHAT IT DOES

What get_active_tab does on Browser

AI agents call get_active_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_active_tab is rated Low

This tool retrieves information about an active tab without modifying state, executing code, or triggering side effects. It is a read-only query operation with minimal security impact.

From the tool's definition Tool name 'get_active_tab' with description 'Get information about the currently active browser tab' indicates passive retrieval of metadata about the current tab.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_active_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_active_tab, this is the rule to start with:

get_active_tab Allowed

get_active_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_active_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_active_tab call is checked against it from then on.

FAQ

Questions about get_active_tab

What does the get_active_tab tool do? +

Get information 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_active_tab? +

Register the Browser MCP server in PolicyLayer and add a rule for get_active_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_active_tab? +

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

Can I rate-limit get_active_tab? +

Yes. Add a rate_limit block to the get_active_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_active_tab completely? +

Set action: deny in the PolicyLayer policy for get_active_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_active_tab? +

get_active_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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