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

Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, so safety posture is covered. The description adds a valuable behavioral caveat that results are candidates and do not constitute infringement/FTE conclusions, but it omits result volume, pagination, and any failure modes for image input.

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?

Two tight sentences, front-loaded with the core action and followed by the legal-scope caveat; there is no filler and every clause carries information.

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?

There is no output schema, so the description should hint at the result shape, and the gaps around topK and image-input requirements matter for correct invocation. It is adequate to identify the tool but not complete for a 9-parameter search endpoint.

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 0% across 9 parameters, so the description must compensate. It meaningfully names the image input and four filter dimensions (region, jurisdiction, Locarno, legal status), covering about six parameters, but leaves topK, title, and topLoc completely undocumentable from either source, and it does not clarify that no image parameter is strictly required by the schema.

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 and resource ('Search design registrations') and names the input modality (image URL or Base64) plus the filter axes, so an agent knows exactly what the tool does. It does not explicitly differentiate itself from adjacent siblings such as nexscope_design_registration_details or the various patent/design image-search tools, which keeps it at 4 rather than 5.

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 phrase 'Results support candidate review and do not establish infringement or freedom to operate' frames the appropriate use context and a legal limitation, which is meaningful guidance. However, there is no explicit when-to-use vs alternative sibling (e.g., design registration details lookup or patent image search) and no stated exclusions beyond the legal caveat.

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