capture_screenshot

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

With no annotations, the description carries full burden for behavioral disclosure. It only states a basic action and omits critical details such as rendering engine, page load behavior, error handling, output format, side effects, or whether it captures full page or viewport. This is a significant gap.

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 very short (one sentence), but it is underspecified rather than concise. It omits essential information that should be present. A one-sentence description can be sufficient only if it is highly informative, which this is not.

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?

Given the tool's simplicity (2 parameters, no output schema, no annotations), the description should at least explain the output and behavior. It fails to mention that the screenshot is saved to output_path, what the return value is, or any constraints. The schema partially fills in parameters, but the description is incomplete.

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 any parameters. It adds no meaning about target_url or output_path beyond their names and types. The default value for output_path is in the schema but not explained in the description.

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 a screenshot') and the resource ('a web page'). It is specific enough to distinguish from sibling tools, which are mostly security scanners and report generators. However, it could be more precise about the scope (e.g., full-page vs viewport).

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 on when to use this tool versus alternatives. There is no mention of prerequisites, comparison with siblings, or scenarios where it is appropriate. The description is silent on usage context.

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