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

No annotations are present, so the description carries the full burden. It adds a behavioral trait: 'Browser-based tool' implies client-side processing and privacy, which is useful. It also states the scale limit ('up to 4x') and format constraints. Still, it does not mention output details, file size limits, or potential side effects, leaving some gaps.

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, front-loaded sentence with a short parenthetical. Every word adds value: the purpose, scale limit, supported formats, and execution context. No redundancy or filler.

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?

The tool is simple (zero parameters, no output schema), and the description covers the core action, formats, scale limit, and browser-based nature. It does not specify the return format, but for an image upscaler the result is generally predictable. The information is reasonably complete for the tool's complexity.

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 has zero parameters, so the baseline for this dimension is 4. The description adds contextual constraints (scale, formats, browser-based) that help an agent understand the tool's behavior, even though there are no parameters to define.

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: 'AI super-resolution upscaling up to 4x' identifies the verb (upscaling), resource (images), and capability limit. It also lists supported formats (PNG, JPG, WebP). However, it does not explicitly distinguish from sibling tools like upscaler-pro or smart-resize, so it falls short of a 5.

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?

Usage is implied: the tool is for upscaling images up to 4x and supports specific formats. But there is no explicit guidance on when to use this tool versus alternatives, nor any exclusions or prerequisites. The format list provides some context but no direct decision-making help.

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