get_sketchfab_model_preview

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It explicitly states that the tool returns a thumbnail as an Image, which is a clear behavioral trait. It also implies a read-only preview action ('preview'), and the 'before downloading' context suggests it does not trigger a full-model download, adding useful behavioral context.

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 compact and well-structured: a one-sentence purpose, a clear usage hint, a parameter definition, and a return description. Every sentence adds value, and the most important information is 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 single-parameter tool with no output schema, the description is complete: it explains the purpose, when to use it, what the parameter means, and what the return value is. It also connects to sibling tools (search_sketchfab_models) appropriately, making it fully self-contained for an agent.

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 schema provides only the parameter name 'uid' with no description (coverage 0%). The description adds meaningful semantics by explaining that uid is 'the unique identifier of the Sketchfab model (obtained from search_sketchfab_models)', which tells the agent where the value comes from, thus compensating for the lack of schema information.

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 'Get a preview thumbnail of a Sketchfab model by its UID', which specifies the exact action and resource. It distinguishes itself from sibling tools like download_sketchfab_model and search_sketchfab_models by focusing on the preview/thumbnail functionality.

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 provides clear context for when to use the tool: 'Use this to visually confirm a model before downloading.' This implies it is a pre-download verification step, distinguishing it from the actual download tool, though it does not explicitly list when not to use it or name alternatives.

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