get_sketchfab_model_preview

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

No annotations are provided, so the description must carry the full load. It discloses the return type (Image) and implies a read-only preview by saying 'before downloading'. However, it omits error behavior, rate limits, or explicit confirmation that no model data is downloaded, which is a moderate gap.

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 brief and well-structured: a one-sentence purpose, a usage sentence, a parameters list, and a return statement. Every sentence earns its place with no redundant content.

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 simple preview tool, the description covers the essential aspects: what it does, when to use it, the key parameter, and the return type. The main omissions are the undocumented 'user_prompt' parameter and lack of failure/error information, but given the simplicity and sibling context, it is largely complete.

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 has no descriptions (0% coverage), and the description compensates by explaining the required 'uid' parameter with context about its source. However, it entirely omits the 'user_prompt' parameter, leaving its purpose unexplained. This partial coverage prevents a higher score.

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 precisely states 'Get a preview thumbnail of a Sketchfab model by its UID', identifying the exact operation and resource. It also differentiates from sibling tools like download_sketchfab_model by clarifying its role in 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 explicitly states when to use it: 'Use this to visually confirm a model before downloading.' It also tells the agent the UID originates from search_sketchfab_models, guiding the workflow. It does not explicitly list alternatives, but the usage context is clear.

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