browser-mcp-demo

create_session

Start a remote browser session to access restricted sites. Returns a unique session ID and view URL for subsequent actions.

Instructions

Create a new browser session and return sessionId + viewUrl.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "create_session"
  }
}

Input Schema

Name	Required	Description	Default
`site`	No

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.3.0May 26, 2026

TDQS

C2.7/5.0

Behavior2/5

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

No annotations provided, so description must bear full weight. Only mentions return values but omits behavioral traits like browser launch, authentication needs, 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.

Conciseness3/5

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

A single sentence is efficient but too sparse for a session creation tool. Lacks structure to convey essential details while remaining concise.

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 one parameter, no annotations, and no output schema, the description fails to explain parameter semantics, return value structure, or when to use. Incomplete for effective agent usage.

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

Parameters1/5

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

Single parameter 'site' with type string and no description. Schema coverage is 0%, and the description provides no clarification on what 'site' means (e.g., URL, domain, 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?

The description clearly states the action ('Create a new browser session') and the return values ('sessionId + viewUrl'). It distinguishes itself from sibling tools like destroy_session and platform_search.

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 vs alternatives. Lacks prerequisites or context, such as requiring a valid site parameter or network connectivity.

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

Deploy Server