screenshot

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

No annotations are provided, so the description carries the full behavioral burden, yet it says nothing about the return format (base64 image, URL, or file path), whether it blocks, or side effects. For a capture tool with zero annotation coverage this is a meaningful 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?

A single short, front-loaded sentence with no filler. It is efficient, though its brevity is also the source of the missing detail rather than deliberate compactness.

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?

Low complexity and a well-documented one-parameter schema make this close to adequate, but with no output schema and no annotations, the description should at minimum state what the call returns (image data vs. path) and how fullPage alters the result.

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?

Schema description coverage is 100% and the single optional parameter is already documented as "Capture full scrollable page," so the baseline is 3. The description adds nothing about the parameter and its "current window" phrasing mildly conflicts with the full-page behavior.

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?

States a specific verb ("Take a screenshot") and resource ("current window"), which no sibling tool duplicates, so an agent can select it unambiguously. The scope wording is slightly muddled by the fullPage parameter, which extends capture beyond the named 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?

No when-to-use guidance, no prerequisites, and no mention of alternatives such as snapshot (which likely exposes DOM/accessibility state instead of pixels). The agent must infer that this is the visual-capture path.

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