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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the safety profile is covered. The description does add genuine behavioral facts — no charge incurred and one-hour signed URL expiry — which are not in any structured field, but it omits what the 'ready next-step block' actually contains and any failure behavior for unfinished projects.

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?

A single dense sentence with no filler, and the return-value list is front-loaded after the pricing note. Leading with 'No charge' prioritizes cost over purpose, which is a minor ordering flaw but the sentence still earns its words.

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?

There is no output schema, so the description must carry the return contract; it lists the file metadata fields and mentions a next-step block, which is a reasonable start. However it does not explain the shape of that block, whether files are paginated, or what is returned when no finished files exist, leaving an agent guessing on edge cases.

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% for the single projectId parameter, and the description says nothing about it — no format, no source (list_projects?), no behavior for an unknown or unfinished id. For a tool whose only input is undocumented, the description should compensate and does not.

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 states the resource (finished files) and enumerates the payload — signed download URLs, sizes, triangle counts, stud sizes — so an agent can tell this is a retrieval tool for completed project output. It lacks an explicit verb and the title 'Finished files' alone would be vague, but the content list disambiguates from list_projects and get_status.

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?

There is no explicit statement of when to call this versus get_status or list_projects, and no prerequisite such as 'project must be finished'. The word 'finished' in the title hints at a precondition but the description never confirms it or tells the agent what happens if the project is still in progress.

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