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

Annotations already declare openWorldHint=true and readOnlyHint=false, so the agent knows this is an external, non-read-only operation. The description adds useful legal-context caveats about candidate review and non-infringement conclusions, but it does not explain why the tool is not read-only, whether it consumes credits, or what external effects may occur.

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 two compact sentences with the core purpose front-loaded. Both sentences earn their place: one defines the search and inputs, the other adds the key legal-use caveat.

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 9-parameter tool with 0% schema description coverage, no output schema, and only minimal annotations, the description is not complete enough. It omits important semantics for several parameters and does not describe result shape, ranking, pagination, or external-operation behavior.

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 carry parameter meaning. It helpfully explains the image URL/Base64 choice and names the region, source-jurisdiction, Locarno, and legal-status filters, but it leaves topK, title, topLoc, and the legal-status 0/1 meaning unexplained.

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 gives a specific verb and resource: searching design registrations by image. The phrase 'design registrations' distinguishes this from product image search and general patent search siblings, though it does not explicitly name alternatives. The image URL/Base64 modality is clearly stated.

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?

It implies usage for candidate review and states that results do not establish infringement or freedom to operate. It also clarifies that one image URL or Base64 image is used with optional filters. However, it gives no explicit when-to-use/when-not guidance or comparison to sibling image-search tools.

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