download_model

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

With no annotations provided, the description carries the full burden. It discloses the download mechanism ('via aria2c'), source types, and destination directory, adding useful context. However, it omits behavioral details such as overwrite behavior, whether the download is synchronous, error handling, or whether the output filename is derived from the URL vs the filename parameter.

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 a single sentence that efficiently conveys the purpose, source, mechanism, and destination. There is no redundancy or unnecessary detail, making it well-structured and easy to parse.

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 description provides essential context for a download tool, but lacks information about important behavioral aspects such as whether existing files are overwritten, whether the destination directory must pre-exist, and what the tool returns upon success or failure. Given the lack of an output schema and annotations, a more complete description would improve usability.

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 coverage is 100%, and the schema already describes each parameter (url, kind, filename) clearly. The description does not add additional meaning beyond the schema, such as explaining the enum values or how the filename override interacts with URL-derived naming. Baseline 3 is appropriate because the schema handles parameter semantics adequately.

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 uses a specific verb ('Download') and clearly identifies the resource ('a model file') and the action's scope (from Civitai / HuggingFace / direct URL). It distinguishes itself from sibling tools like list_models by focusing on the download action rather than listing.

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 implies the tool is used to download model files into a chosen directory, but it does not explicitly state when to use it versus alternatives or mention any exclusion criteria. There is no guidance on scenarios where a different tool (e.g., list_models) would be more appropriate.

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