Roblox MCP

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

No annotations provided, so description carries full burden. Fails to disclose state management (what load returns, whether stop destroys tracks), error conditions, or side effects. Only mentions target entities (humanoid/controller).

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?

Extremely compact single sentence with no fluff. Front-loads the domain [PRO] Animation. Minor structural awkwardness in joining two sentence fragments, but efficiently conveys the four operation modes.

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?

Despite 100% schema coverage, the description is insufficient for an 8-parameter polymorphic tool. No explanation of return values, conditional parameter requirements (trackId only for play/stop), or the load->play workflow relationship.

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 has 100% description coverage with detailed parameter docs, establishing baseline of 3. Description mentions 'humanoid/controller' which links to path parameter, but doesn't add semantic value beyond the schema's existing enum descriptions for the action parameter.

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 specific actions (load, play, stop, get) and resource (animations/tracks) clearly. The [PRO] prefix and 'humanoid/controller' context help distinguish from manage_assets, though it doesn't explicitly contrast with siblings.

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?

Provides no guidance on when to use this vs. manage_assets, no workflow explanation (e.g., must load before play), and no prerequisites. Only lists capabilities.

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