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

Annotations already declare destructiveHint=true, openWorldHint=true, and readOnlyHint=false, so the safety profile is covered. The description usefully adds that the operation consumes one of the linked account's style copies, a quota/consumption trait not expressed in the annotations, but it never explains what 'destructive' means here (overwrite of an existing style, irreversible quota spend) or what happens when the copies run out.

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 tight sentences, no filler, with the core action front-loaded and the quota caveat following. Every sentence earns its place.

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 destructive, open-world, three-parameter tool with a nested object and zero schema documentation, the description is too thin: it omits naming rules, the required subfields inside reference, mutual exclusivity of the two reference inputs, and quota-exhaustion behavior. The annotations cover safety, but the input contract is largely undocumented.

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?

With 0% schema description coverage the description must carry the load, and it partially does by mapping the two ways to supply a reference ('by link or file') onto reference_url versus the nested reference object. It says nothing about the 'name' parameter, its 60-character cap, or that the nested reference requires both file_id and download_url.

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 ('Build a reusable editing style') and resource, and scopes the input to 'one reference video shared by link or file'. It does not explicitly distinguish itself from siblings like browse_styles or edit_video, but the create-from-reference framing is unambiguous.

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 statement of when to use this versus browse_styles, edit_video, or revise_video, and no prerequisites (account linkage, permissions) are given. The only contextual hint is that it consumes an existing style copy, which is behavioral rather than a usage condition.

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