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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description adds real behavioral context the annotations don't: the call mints a 'fresh download link' rather than returning a static URL. It stops short of saying whether the link expires or how failures look, keeping it below a 5.

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?

Two sentences, both front-loaded with the decision rule first and the exclusion second. No filler, no restating of the tool name or schema.

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 single-parameter read tool with no output schema, the description covers when to call it, what it returns, and what not to use it for. The only meaningful omission is the lifetime/expiry behavior of the 'fresh' download link, which matters for how the agent sequences downstream use.

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 single parameter is typed and documented as 'The asset UUID', so the schema handles the mechanics. The description still adds provenance value by telling the agent where to obtain that ID (list_assets).

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+resource ('get_asset') and names both outputs: the file's details and a fresh download link. It also explicitly distinguishes itself from the browsing sibling list_assets, so an agent can pick it without opening either schema.

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?

Gives an explicit precondition ('when you already have an asset's ID (from list_assets)'), an exclusion ('Do not use it to browse files'), and names the alternative tool to use instead. Nothing is left to inference.

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