Screenshot page

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 does disclose the side effect 'This activates the tab,' which is helpful. However, it does not mention what happens with the captured screenshot (e.g., return format, file path) or any permission requirements, leaving some gaps.

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?

Two short sentences front-load the primary purpose and add a key side effect. No wasted words; every sentence earns its place.

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 with one parameter and no output schema, the description covers the core action and the activation side effect. However, it omits any details about the return value or output format, which are essential for an agent to know how to consume the result, making it only partially complete.

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 schema has 0% description coverage and the description does not mention the tabId parameter at all. Although the parameter name is self-explanatory within the schema, the description fails to reinforce its meaning or provide any additional context, so it does not compensate for the low schema coverage.

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 ('Capture the visible viewport') and the resource ('a Chrome tab'), which is specific and distinct from sibling tools like browser_snapshot. It also adds a meaningful scope qualifier ('visible viewport') that clarifies what is captured.

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?

The description implies usage when a visual capture is needed, but it does not explicitly compare with alternatives like browser_snapshot or browser_list_tabs. There are no exclusions or when-not-to-use conditions, so guidance is only implicit.

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