get_sketchfab_model_preview

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

The description mentions it returns a thumbnail as an Image, implying a read-only operation without side effects. However, it lacks details on error handling, performance, or potential issues like invalid UID, which would be important for safe invocation given the absence of annotations.

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 concise with three sentences and a parameter list, efficiently conveying the tool's action, use case, and parameter source. There is no redundant information, and key points are 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?

Given the simple tool with one parameter and no output schema, the description adequately explains what it does and what it returns (thumbnail as Image). However, it could be more specific about the image format or how it is returned, but it is sufficient for basic usage.

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 description adds meaning for the 'uid' parameter by stating it is obtained from search_sketchfab_models, which is not present in the input schema. It provides crucial source context, though it omits format specifics like string length or validation rules.

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', specifying the verb, resource, and method. It distinguishes this tool from siblings like search_sketchfab_models and download_sketchfab_model by focusing on visual confirmation before download.

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 advises using it to 'visually confirm a model before downloading', providing clear context for its use. It does not explicitly list alternatives or when not to use, but the context implies it is a preliminary step to download_sketchfab_model.

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