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

Annotations are sparse (not read-only, not destructive), and the description adds useful constraints: local file, supported formats, and seller-owned pack listing. However, it does not disclose whether an existing preview image is overwritten, whether ownership is validated, or what the tool returns. No contradiction with annotations.

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?

A single sentence front-loads the action and includes only essential constraints. No filler, repetition, or unnecessary detail.

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?

Adequate for a simple two-parameter upload tool if the caller already understands ownership and intended placement, but it does not explain overwrite behavior, authentication requirements, or the response/return value. With no output schema, the missing return semantics are a notable gap.

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 schema only documents productId; imagePath has no description. The description adds meaning by clarifying that imagePath is a local image path rather than a URL and lists accepted formats, but it omits path style, size limits, and how the image is tied to the productId.

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 a specific verb (Upload), a precise resource (one local image to the seller-owned pack listing), and the allowed formats (JPEG, PNG, WebP, AVIF). The tool is clearly differentiated from the sibling upload_ai_pack by the word 'image' and the 'preview image' framing in the title.

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 given on when to use this tool versus upload_ai_pack, update_ai_pack_draft, or publish_ai_pack. The seller-owned listing condition is mentioned but not explained, and no alternatives or exclusions are provided.

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