download_sketchfab_model

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

With no annotations, the description carries the full behavioral burden and it does a good job: it discloses the scaling behavior, the requirement to provide a target size, the return message with import details, and access prerequisites. It does not mention edge cases or failure behavior, but the core side effects are 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 front-loaded with purpose and scaling behavior, then provides a focused parameter list with useful examples. It is slightly repetitive about target_size being required, but no sentence feels unnecessary.

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?

The tool is simple (two parameters, no output schema), and the description covers the input semantics, the scaling behavior, prerequisites, and what the return message contains. It could add failure/edge-case behavior, but for its complexity it is reasonably 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?

Schema description coverage is 0%, but the description compensates well for target_size with units, requirement status, and concrete examples. The uid parameter is only described as 'the unique identifier,' which is thin but sufficient given the tool name and context. This is strong compensation for an otherwise 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 starts with a specific action ('Download and import a Sketchfab model by its UID') and clearly identifies the resource and key behavior. This distinguishes it from sibling Sketchfab tools like search_sketchfab_models and get_sketchfab_model_preview, which do not import.

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 explains that the tool requires a UID and target_size and that the model must be downloadable with proper access rights, which gives some context. However, it never explicitly says when to prefer this tool over alternatives such as search_sketchfab_models or import_generated_asset, so usage guidance is only implied.

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