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. It discloses the tool's purpose (preview for visual confirmation) and output format (returns thumbnail as Image), which is helpful. However, it doesn't mention behavioral aspects like rate limits, authentication needs, error conditions, or whether this is a read-only operation (though implied by 'get').

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 perfectly structured with a clear purpose statement first, usage guidance second, parameter explanation third, and return information last. Every sentence earns its place with no wasted words, and it's appropriately sized for a single-parameter tool.

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 annotations and no output schema, the description does well by explaining the parameter semantics, purpose, and usage context. It could be more complete by mentioning potential errors or limitations, but given the tool's relative simplicity, it provides adequate context for effective use.

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%, so the description must compensate fully. It provides essential semantic information about the 'uid' parameter: what it represents ('unique identifier of the Sketchfab model'), where to obtain it ('from search_sketchfab_models'), and its purpose ('to get preview thumbnail'). This adds significant value beyond the bare 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?

The description clearly states the specific action ('Get a preview thumbnail'), resource ('of a Sketchfab model'), and scope ('by its UID'). It distinguishes from siblings like 'download_sketchfab_model' by focusing on preview rather than download, and from 'search_sketchfab_models' by operating on a specific model rather than searching.

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 this tool ('to visually confirm a model before downloading') and references a sibling tool ('search_sketchfab_models') as the source for obtaining the UID parameter. However, it doesn't explicitly state when NOT to use it or mention all relevant alternatives like 'get_object_info' or 'get_scene_info'.

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