masks_get_thumbnail

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

No annotations provided, so description must disclose behavior. It only says 'get thumbnail', implying a read operation, but lacks details on return format (e.g., URL, binary), error handling for invalid IDs, or side effects. Insufficient for agent decision-making.

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 description is highly concise with no unnecessary words. It is front-loaded and efficient for a simple 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?

Despite simplicity, the description lacks information about the return value (e.g., thumbnail URL, image data) and typical usage steps (e.g., obtaining a mask ID first). No output schema exists, so description should compensate but does not.

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 coverage is 100% with parameter 'id' described as 'The ID of the mask'. The description adds no extra meaning beyond the schema, meeting baseline but not exceeding it.

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 'Get thumbnail for a specific mask' clearly states the tool's action (get) and resource (thumbnail for a mask), distinguishing it from sibling tools like 'masks_get' (mask properties) and 'masks_get_all' (listing masks).

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 use this tool vs alternatives, or prerequisites like needing a mask ID from 'masks_get'. The description only states the action without context.

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