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 persistence model (session vs permanent), state transition behavior (can you play after cancel?), side effects, or cleanup behavior. Only mentions 'smooth animations' as behavioral context.

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?

Single sentence is appropriately brief, though the '[PRO]' prefix wastes valuable front-loaded real estate without aiding comprehension. Structure is simple but not optimally organized for a multi-action tool.

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?

Inadequate for a 5-parameter tool with nested configuration objects and implicit state machine. No mention of output handling (tweenId generation), error scenarios, or lifecycle management. Lacks explanation of how tweenInfo properties interact with target properties.

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 100%, providing baseline 3. Description lists the four actions already defined in the enum but adds no semantic context about parameter relationships (e.g., that tweenId output from create is required input for play/pause/cancel) or complex nested object semantics.

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 verbs (create, play, pause, cancel) and resource (tweens) for smooth animations. However, lacks differentiation from sibling 'manage_animation' or 'manage_effects' which also handle motion/visual changes.

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?

Lists available actions but provides no guidance on when to use tweens vs alternatives (e.g., Animation vs Effects siblings), nor does it explain the required workflow (create before play/pause/cancel) despite clear parameter dependencies in the schema.

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