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

Annotations already declare non-readOnly, non-destructive, non-idempotent and closed-world, so safety is covered. The description adds genuinely new context—a fixed $0.02 per-call price—which the agent cannot get from structured fields. It still omits how many variants are returned and whether output is deterministic, given idempotentHint=false.

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?

Three short sentences with the purpose front-loaded and the price in the middle; nothing is redundant. It is appropriately sized for the amount of information it chooses to convey.

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?

No output schema exists, so the description should explain the return shape (how many variants, approximate length, format), but it does not. Combined with fully undocumented parameters and no sibling routing, an agent has to guess at both inputs and outputs before calling a paid 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 0% across three parameters, so the description carries the full burden. It only implies that 'product' is the input; 'tone' and 'audience' are never mentioned, and no guidance on acceptable values or defaults is given. With zero schema help, this is a clear gap.

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 and resource: 'write short ad copy variants for a product.' The agent can tell this is a creative copy-generation tool. It does not name a sibling to distinguish itself from near-neighbours like fikra_generate_social_post or fikra_generate_product_description, leaving the boundary implicit.

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?

'Several options to test without starting from a blank page' implies the use case is variant generation for A/B testing, but the description never says when to prefer this over the other generate_* siblings or when it's the wrong choice. Usage is implied rather than stated.

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