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

Annotations already cover the safety profile (readOnlyHint true, destructiveHint false, openWorldHint false), so the bar is lower. The description still adds real value: it discloses the account-tier prerequisite, the max-8 long-video slot constraint, the remediation step ('delete in the SendShort app Home if full'), and clarifies that MUSIC_VIDEO quota counts completed jobs plus in-flight — none of which are in structured fields.

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 opens with the core purpose and then lists the data points returned. It is dense but every clause corresponds to a distinct returned field or constraint; the only weakness is that it reads as one run-on enumeration rather than being grouped or bulleted.

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 carries the burden of explaining return values and does so thoroughly — plan eligibility, slots, three quota types, and two named rate limits. What's missing is any indication of response shape or what a plan-ineligible response looks like, which an agent would need to branch on.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline is 4. The description correctly spends its space on what the call returns instead.

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 a concrete verb and resource — check SendShort API plan eligibility, slot capacity, quotas, and rate limits — and enumerates the exact return fields, so the agent knows this is an account-level status/preflight call. It could go one step further and explicitly distinguish itself from the job-level siblings get_clip_status / get_import_status / get_music_video_status, which is the only thing keeping it from a 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 rather than stated: the enumeration of plan eligibility and quotas suggests calling this before submitting jobs, and 'Professional or Business plan required' is a useful prerequisite. But there is no explicit when-to-call guidance and no naming of the sibling status tools it should be preferred over or combined with.

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