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

Annotations already declare readOnly/no-destructive safety, so the bar is lower; the description adds genuinely useful behavior by disclosing that small text files return inline while others carry a download_url, and that wait up to 20s long-polls for the first file. That is real operation-level context beyond the annotations.

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?

Three tight sentences with the action front-loaded, followed by return-shape behavior and the optional wait semantics. Every sentence earns its place with no filler.

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?

An output schema exists, so return structure need not be spelled out, yet the description still usefully previews inline vs download_url handling. Combined with complete parameter coverage and clear safety annotations, nothing an agent needs to invoke it correctly is missing.

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 100%, so all three parameters are documented in the schema itself; the baseline is 3. The description restates the wait semantics ('wait for the first file to arrive') but adds no syntax or defaults beyond what the schema already says.

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 ('List the files people sent to one of your upload links'), which is unambiguous and separable from siblings like get_link_stats or create_upload_link. It does not explicitly name a sibling to contrast against, so it falls just short of 5.

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?

Usage is implied: it operates on an existing upload link whose id/key come from 'the tool that made the link', and the wait parameter implies a polling/waiting scenario. But there is no explicit when-to-use or when-not-to-use guidance against alternatives such as get_link_stats.

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