get_sketchfab_model_preview

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

With no annotations provided, the description carries full burden for behavioral disclosure. It clearly indicates this is a read-only retrieval of a thumbnail, with no side effects. It could add details about error cases (e.g., invalid UID) but the core behavior is adequately transparent.

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 extremely concise: four sentences total, with the main purpose in the first sentence and usage guidance in the second. The parameter explanation is integrated succinctly. No redundant or irrelevant 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?

Given the tool's simplicity (one parameter, no output schema), the description covers the essential aspects: what it does, how to use it, and what it returns (thumbnail Image). It is complete enough for an agent to use correctly, though details like image format or size are omitted.

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?

The input schema only defines 'uid' as a string with no description, giving 0% schema coverage. The description compensates by explaining that the uid is 'obtained from search_sketchfab_models,' providing essential context for how to populate the parameter.

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 clearly states the tool's action: 'Get a preview thumbnail of a Sketchfab model by its UID.' It specifies the resource (Sketchfab model) and the result (thumbnail). The usage context 'visually confirm a model before downloading' distinguishes it clearly from sibling tools like download_sketchfab_model and search_sketchfab_models.

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 explicitly advises when to use this tool: 'Use this to visually confirm a model before downloading.' It implies that download_sketchfab_model is the alternative for actual downloading. However, it does not explicitly state when not to use it or mention any prerequisites beyond having the UID.

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