take_screenshot

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

With no annotations, the description carries the full burden of behavioral disclosure. It does disclose defaults (path defaults to Desktop with timestamp) and parameter behaviors (region enables interactive selection, to_clipboard saves to clipboard instead of file). However, it omits return value information, potential permission requirements (e.g., screen recording), and whether the capture is full-screen or window-specific.

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 concise and well-structured, beginning with a one-sentence summary followed by a clear Args block. Every sentence provides useful information without redundant or excessive detail.

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 tool with 3 optional parameters and no annotations, the description covers core behavior and parameter effects. However, it lacks details on return values (though an output schema exists), required permissions, and the default capture scope (full screen vs. active window), leaving some context gaps for an AI agent.

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 coverage is 0%, so the description must compensate. It does so by explaining each parameter's purpose and behavior: path specifies save location, region toggles interactive selection, and to_clipboard changes the output target. This adds meaning beyond the bare schema types and defaults.

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 'Capture a screenshot.' with a specific verb and resource, clearly distinguishing it from sibling tools which do not include screenshot functionality. The parameter details further clarify capture modes such as region selection and clipboard output.

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 through the tool's name and summary but does not explicitly state when to use it versus alternatives or any exclusions. It provides no guidance on choosing between full-screen and region capture or when clipboard output is preferable.

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