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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only mentions 'browser-based tool,' which gives a hint about execution context, but does not disclose side effects (e.g., file modification, privacy implications) or other behavioral traits such as whether it is read-only or destructive.

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 that clearly states the action and scope. It earns its place with no wasted words, making it highly concise and well-structured.

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 simplicity (no parameters, no output schema), the description provides sufficient context for an agent to understand its purpose and execution context. It could be slightly more complete by mentioning output formats or prerequisites, but for this complexity level, it is adequate.

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 (0 parameters) and schema coverage is 100%, so there are no parameter details to explain. The description adds context about batch processing and support for text or logo watermarks, which gives meaning to the tool's function beyond the empty 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: 'Add text or logo watermarks to images in batch.' It uses a specific verb ('add') and resource ('watermarks to images'), and the batch scope distinguishes it from other image editing tools like bg-remover or image-resizer.

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 implies usage for watermarking images but does not explicitly state when to use this tool versus alternatives like text-overlay-maker or telop-image-generator. It lacks exclusions or comparison to sibling tools, relying on the name and purpose to convey applicability.

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