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

The description discloses that the tool is 'free, AI-generated, rate-limited,' adding behavioral context beyond the readOnlyHint annotation. The rate-limit warning is particularly useful for agents managing API usage, which is a concrete behavioral trait.

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 sentence that conveys the core function quickly. It includes some redundancy by repeating the title 'Ad Copy Generator:', but it remains concise and front-loads the essential information.

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?

With no output schema and low parameter coverage, the description should clarify return values and parameter behavior. It does not mention what the generated output looks like or how parameters affect results, making it incomplete for even a simple tool.

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?

Schema description coverage is only 33%, and the tool description does not explain the meaning of 'topic,' 'product,' or 'platform.' With such low schema coverage, the description should compensate by clarifying parameter semantics, but it fails to do so, leaving agents to guess.

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 explicitly states 'Generate ad headlines and descriptions,' providing a specific verb and resource. This clearly distinguishes it from sibling generator tools like headline-generator or meta-description-generator by scoping to advertising copy.

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 offers no guidance on when to use this tool versus alternatives. It lacks any mention of use cases, exclusions, or references to sibling tools, leaving the agent to infer applicability without support.

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