Resize the active Firefox window to exact width and height for responsive testing, layout checks, or consistent screenshots.
Resize the browser window
| Name | Required | Description | Default |
|---|---|---|---|
| width | Yes | Width of the browser window | |
| height | Yes | Height of the browser window |
Changes observed during successful MCP inspections.
v1.0.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description does not disclose any behavioral traits beyond the bare action. Annotations already indicate it is not read-only and is destructive, but the description adds no extra context about side effects like layout reflows or potential viewport changes.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, short declarative sentence with no unnecessary words. It is perfectly concise and well-structured for the simple action it describes.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple tool, the description is adequate, but it lacks any extra context such as units (e.g., pixels), constraints, or when resizing might be appropriate. Given the simplicity and schema coverage, it is minimally complete but not rich.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema already provides descriptions for both parameters (width and height), achieving 100% coverage. The description adds no additional meaning about the parameters, so it stays at the baseline of 3.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action (resize) and the resource (browser window), making it distinct from sibling tools like navigate or click. However, it lacks any nuance about whether it resizes the viewport or the entire window, but the core purpose is clear.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance is provided about when to use this tool versus alternatives. It does not mention scenarios like adjusting viewport for responsive testing or any conditions that would make it preferable to other navigation tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.