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

readOnlyHint=true already tells the agent this is a safe, side-effect-free read, so the description's job is lighter. It adds value by disclosing the scope of the returned content (limits, character targets, plugin, import paths), but says nothing about freshness, rate limits, or whether results are static documentation.

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 the resource named first and the covered topics listed after. It is somewhat list-heavy but every clause maps to distinct returned content, so no sentence is wasted.

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 parameters and no output schema, the description carries the burden of describing what comes back, and its topic enumeration (capabilities, request limits, character targets, plugin, import paths, workflow links) does that reasonably well. It is complete enough for an agent to know what this lookup yields.

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, which sets the baseline at 4. Nothing about argument semantics needs explaining, and the description introduces no parameter-like concepts that could confuse the caller.

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 (Explain) and resource (public Roblox R15 Text-to-Motion / Video-to-Motion generation capabilities), then enumerates the exact topics covered. This clearly separates it from sibling lookups like get-pricing or get-api-discovery, though it never names them 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?

No guidance on when to call this versus alternatives such as get-api-discovery or get-api-examples. Usage is only implied by the content list; an agent must infer that this is a static knowledge/overview lookup rather than a runtime capability probe.

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