use_window_viewport

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

With no annotations provided, the description carries the full behavioral burden. It does disclose one important trait: the session is not replaced. But it does not say whether the removal is reversible, what happens to existing layout state, whether permissions or page ownership are required, or how the operation affects the browser viewport. That is a meaningful but incomplete disclosure for a mutation-like action.

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 front-loaded sentence with no wasted words. It is concise, though the term "fixed metrics" is underspecified rather than merely brief.

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 zero-parameter action tool with an output schema, the description covers the core effect and one behavioral constraint (session preservation). Still, it lacks usage context and a clear definition of "fixed metrics," which an agent needs in order to know when this tool is appropriate versus its many window and browser siblings.

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 tool takes zero parameters, so the baseline is 4. There are no parameter semantics to document, and the schema coverage is complete by definition. The description does not need to add parameter meaning.

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 names an action ("Remove fixed metrics") and a target ("the current owned page"), so the general effect is inferable. However, "fixed metrics" is unexplained jargon and the tool name suggests viewport configuration rather than metric removal, leaving ambiguity about what is actually changed. It also does not differentiate itself from window-oriented siblings such as minimize_owned_window or restore_owned_window.

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?

There is no explicit guidance on when to call this tool, what problem it solves, or which sibling to use instead. The phrase "current owned page" implies a context but does not state prerequisites or exclusions. An agent would have to guess based on the name alone.

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