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

The readOnlyHint annotation already establishes this as a safe read, and the description adds useful disclosure of what is returned (name, status, length, size). It does not say whether results are paginated, ordered, or what happens when the id is invalid or the mascot has no clips.

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?

One sentence with no wasted words, but it is a sentence fragment focused on output contents rather than on the action, which makes the opening less immediately actionable than a verb-first statement would be.

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 no output schema, listing the returned fields is genuinely valuable and mostly covers the return side. However, for a one-parameter lookup tool the ambiguity around what 'id' identifies, plus the absence of pagination or empty-result behavior, leaves meaningful gaps.

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 single parameter 'id' has 0% schema description coverage, so the description carries the full burden. It only weakly implies the id refers to a clip mascot via the phrase 'of a clip mascot'; it never states that explicitly, nor whether it accepts a mascot id versus a clip id.

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 names the resource (the motion library of a clip mascot) and enumerates returned fields, but it is a noun phrase with no verb — the agent must infer 'list' from the title and name. It does implicitly distinguish itself from list_mascots by scoping to clips of a single mascot, but that differentiation is left implicit rather than stated.

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 when-to-use guidance, no prerequisites, and no mention of alternatives such as get_mascot or create_clip. The agent is not told what condition selects this tool over its siblings.

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