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

There are no annotations, so the description carries the full behavioral burden. It discloses the scope (images for your token), the two categories included, and that sizes are returned. However, it does not mention whether the operation is read-only, what the output format is, or whether pagination or ordering applies. For a simple listing tool this is adequate but not fully transparent.

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 a single compact sentence that front-loads the core action, then efficiently adds the key scoping and content details. Every element adds value, with no redundant wording.

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 tool's low complexity, zero parameters, and lack of an output schema, the description covers the essential purpose, scope, and included content. It is slightly incomplete because it does not hint at the output structure (e.g., file names, paths, or format), but for a simple listing operation the gap is minor.

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 input schema is empty, so there are no parameters requiring explanation. The description correctly adds no parameter-related noise. With zero parameters, a baseline of 4 is appropriate because the parameter semantics burden is nonexistent.

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 uses the specific verb 'List' and clearly identifies the resource: images stored for the caller's token. It further distinguishes the tool by covering both uploaded images and server-generated images, which sets it apart from sibling mutation tools like image_upload, image_resize, and image_delete_upload.

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?

The description communicates a clear retrieval use case: when you need to see all images associated with your token. It does not explicitly name alternatives or exclusions, but among the sibling tools it is the only listing operation, so the intended usage is fairly evident.

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