plate_pair

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

With no annotations, the description carries the behavioral disclosure burden. It does disclose the key output behavior: vertical stacking on black, labels above each frame, and a clean image. It does not mention side effects like overwriting, failure behavior, or label defaults, though the schema covers defaults and file extensions.

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?

One sentence contains the operation, output purpose, layout, background, labels, and exclusion of extra content with no filler. The core verb and result are front-loaded.

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 relatively simple compositing operation, the description covers the important visual/output behavior while the schema covers paths, required fields, file extensions, and label defaults. It could be slightly richer on what happens when the tool runs, but nothing critical is missing.

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 100%, so the baseline is 3. The description reinforces the roles of before/after and labels via 'before/after image' and 'a label above each', but it adds little beyond what the schema already names and describes.

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 uses a specific verb ('Composite') and resource ('two frames into the before/after image'), and adds concrete visual detail (stacked vertically, black, labels). It does not explicitly differentiate from siblings such as plate_stack, though the product-image phrasing narrows the intended use.

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 explicit when-to-use or when-not-to-use guidance is provided, and no alternative tool is named. The 'ships everywhere' phrasing hints at a specific product context, but the agent is left to infer when plate_pair should be chosen over plate_stack or other siblings.

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