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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior, so the safety profile is covered. The description adds that the widget is filterable and media-scoped, but it does not disclose return behavior, pagination, or source semantics; this is acceptable but not rich 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?

The description is two short sentences, front-loads the tool's purpose, and adds a clear usage directive with zero filler. Every phrase contributes meaningful selection information.

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?

With five parameters, no schema descriptions, and no output schema, the description is too thin to be functionally complete. It provides high-level purpose and sibling distinction but leaves important browse/filter semantics and expected results unexplained.

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%, and the description only repeats media types already present in the fileType enum. It does not explain the meaning or expected values of `from`, `query`, `reference`, or `toolNames`, so it fails to compensate for the schema gap.

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 identifies the tool as a filterable gallery widget for image/video/audio assets, and the tool name makes the listing purpose clear. It also distinguishes itself from `creations_search` by framing it as the browse-library option, though it lacks a direct imperative verb like 'list'.

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 description explicitly says to use this tool instead of `creations_search` when the user wants to browse their library, providing both a concrete usage context and a named sibling alternative. This gives an agent clear selection guidance.

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