Output Thumbnail

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

The description does not disclose the output format (e.g., binary, URL), side effects, or the role of the 'exif' boolean parameter. Without annotations, this lack of detail leaves the behavior opaque.

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?

The description is extremely concise and to the point, with no unnecessary words. It focuses on the core action and endpoint, making it easy to parse.

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?

Given the lack of annotations and output schema, the description fails to cover important contextual aspects like return type, error handling, or the relationship with the file system. It is too sparse for a tool with multiple parameters and potential variations.

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 description only mentions the 'file' parameter implicitly through the endpoint, and completely omits the 'exif' parameter. The schema provides no additional meaning, so the description adds minimal value beyond the raw schema.

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 clearly states the tool's function: retrieving a thumbnail for an output file. It identifies the endpoint and the primary file parameter, making the purpose unambiguous.

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 is provided on when to use this tool versus alternatives like the file browser or image retrieval endpoints. The description does not specify the context or edge cases where this tool is appropriate.

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