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

With no annotations, the description carries the full behavioral burden, and it does disclose meaningful traits: results are paginated metadata plus a preview image URL, has_more signals whether another page exists, and offset+limit retrieves the next page. It omits auth requirements, rate limits, and empty-result behavior, keeping it short of a 5.

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?

Three tight sentences with zero waste: purpose and filters first, then the return shape, then the pagination mechanic. Everything is front-loaded and each sentence earns its place.

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, yet the description compensates by naming the return contents (paginated metadata plus preview image URL) and the has_more pagination flag. For an 8-parameter, 1-required search tool this is nearly sufficient; only error/empty-result behavior is unaddressed.

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 100%, so every parameter is already documented at the schema level (including limit bounds and the 3-character keyword minimum). The description only restates the filter categories and adds no syntax or format meaning beyond the schema, so the baseline 3 applies.

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 (search) and resource (Sketchlib 3D model library) plus scope (by keyword, optionally narrowed by author/category/tag/face-count). An agent can immediately distinguish this from get_model (fetch one) and download_model (retrieve a file).

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 'optionally narrowed by author, category, tag, or face-count range' implies when to add filters, and the pagination sentence implies iterative use. However, there is no explicit guidance on when to prefer this over get_model, nor any exclusions or prerequisites for use.

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