take_screenshot

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

With no annotations provided, the description carries the full disclosure burden. It does reveal one useful behavioral trait — the result is returned as base64 rather than a file path or binary — but it omits whether the capture is viewport-only or full-page and does not state prerequisites such as an active browser session.

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 sentence with no filler; the action verb is front-loaded and the base64 return detail earns its place. Nothing could be trimmed without losing meaning.

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 tool with no output schema, this is close to complete: it states the action and the return encoding. The only real gaps are the viewport-versus-full-page ambiguity and the implicit browser-session requirement, which are marginal for a simple capture tool.

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 has zero parameters, so the baseline 4 applies and there is nothing for the description to explain about parameters. The empty schema is trivially fully covered at 100%.

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 states a specific verb ('take'), a resource ('screenshot'), and the return format ('base64'), making the tool's function unambiguous. It doesn't explicitly differentiate from the sibling compare_screenshot, though the capture-versus-compare distinction is inferable from the verbs.

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 given on when to use this tool instead of alternatives. The sibling list includes the closely related compare_screenshot, but the description neither mentions it nor states any condition that would route an agent to one tool over the other.

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