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

With no annotations, the description carries the full behavioral burden. 'Expiring' usefully discloses that the URL is time-limited, but it omits the TTL, whether access is signed or authenticated, and whether the URL can be reused — all material for a download-link tool.

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 front-loaded sentence with no filler or redundancy. It is efficient, though its brevity is partially the source of the missing parameter and usage detail.

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 output schema covers return values, so the description needn't explain them, and a one-parameter tool is simple. Still, the single required parameter is undocumented and there is no guidance on URL lifetime or prerequisite state, leaving an agent guessing about how to obtain a valid input.

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%, so the description must compensate, yet it only restates 'storage_path' with no format, example, or pointer to the tool that produces it. An agent cannot tell whether it needs an absolute path, a bucket key, or an ID returned by list_subtitles.

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 ('Get') and resource ('expiring download URL') scoped to a saved subtitle's storage path. It implicitly distinguishes itself from export_subtitle and delete_subtitle by framing the result as a temporary URL, though it never names those siblings explicitly.

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 word 'saved' weakly implies the subtitle must already exist, but there is no explicit when-to-use guidance, no statement of when to prefer export_subtitle instead, and no mention of where the required storage_path should come from (e.g., list_subtitles).

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