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nayakprashant

Selenium MCP Server

open_new_tab

Open a new browser tab and optionally navigate to a specified URL. The new tab becomes active immediately.

Instructions

Open a new browser tab and optionally navigate to a URL.

Purpose

Creates a new tab within the current browser session. The newly opened tab becomes the active tab.

Parameters

session_id : str Active browser session identifier. url : str, optional URL to open in the new tab. If not provided, a blank tab is opened.

Returns

dict { "session_id": str, "status": str, "message": str }

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlNo
session_idYes
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Describes that the new tab becomes active and returns status/message. No annotations provided, so description carries disclosure burden, but lacks details on error behavior, permissions, or side effects.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Well-structured with clear Purpose, Parameters, and Returns sections. Every sentence provides value, no redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers the essential behavior of opening a tab and optional navigation. Could benefit from error handling notes, but overall sufficient for a simple tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Adds meaning to the optional url parameter beyond the schema, noting the default behavior of opening a blank tab. However, session_id lacks extra description beyond its name.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states it opens a new browser tab with optional URL navigation. Distinguishes itself from sibling tools like close_tab, switch_tab, and open_url.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives like open_url (which navigates current tab) or switch_tab. Lacks scenario-based recommendations.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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