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nex-browser

NexBrowser MCP Server

Official
by nex-browser

nex_open_browsers

Start one or more NexBrowser environments and retrieve their status for browser automation and session-isolated page inspection.

Instructions

Start one or more NexBrowser environments and return their status.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
teamIdYes
windowIdYes
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states that it starts environments and returns status, without mentioning side effects, idempotency, failure modes, or whether existing sessions are affected. The description lacks critical behavioral context for a tool that mutates state.

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?

The description is a single, concise sentence that front-loads the primary action ('Start one or more NexBrowser environments') and includes the return behavior. It contains no filler or redundant information, making it extremely efficient.

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

Completeness2/5

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

Given the absence of annotations and output schema, the description lacks important details: what 'status' specifically contains, how multiple windowIds are processed, whether the operation is atomic, and any prerequisites for teamId. The description covers the basic action but is insufficient for safe automatic invocation of a state-changing tool.

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

Parameters2/5

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

Schema coverage is 0%, so the description must compensate. It hints that 'one or more' environments can be started, which aligns with windowId accepting an array, but it completely omits the meaning or role of teamId. The description provides minimal value beyond the raw JSON schema types.

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?

The description uses the specific verb 'Start' with the resource 'NexBrowser environments' and mentions returning their status, which clearly distinguishes it from sibling tools like nex_list_browsers, nex_close_browsers, and nex_browser_connect. The purpose is immediately understandable and unambiguous.

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?

The description provides no guidance on when to use this tool versus alternatives. It does not mention prerequisites, situations where this tool is appropriate, or when to avoid it in favor of tools like nex_list_browsers or nex_browser_connect. The usage context is entirely implied by the action verb.

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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