list_model_files

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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint, so safety and reproducibility are covered. The description adds which attributes accompany each file (sizes, G-code metadata), which is useful, but the closing "Returns: All files of the model" is vague and duplicates both the opening sentence and the output schema.

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 core capability and the URL alternative are front-loaded in two short sentences. The trailing "Returns:" block restates the first sentence and the output schema, so it is mild dead weight rather than a structural flaw.

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?

With a full output schema, complete annotations, and a fully documented single parameter, the description only needs to convey scope and sibling routing, which it does. The G-code metadata note is a genuine value-add not visible from the schema alone.

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 there is a single required parameter whose schema description already gives accepted forms ("Model ID (\"3161\") or model page URL"). The description adds nothing about the parameter, so baseline 3 is appropriate.

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?

States a specific verb and resource ("List every downloadable file of a model") and adds the distinguishing payload details: file sizes and, for G-code, printer/material/slicing parameters. This separates it cleanly from get_download_links and from the model-listing siblings.

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?

Explicitly names the alternative and the condition that selects it: use `get_download_links` to obtain the actual URLs. An agent knows this tool enumerates files and does not resolve download URLs, which is the key routing decision here.

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