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

It discloses behavior well beyond the annotations: calling is effectively a no-op that returns a preview and a confirmation link, and only the merchant on that page can actually apply the change. This is genuinely useful two-phase-commit context. The only blemish is that it never reconciles this 'changes nothing' framing with the readOnlyHint=false annotation, leaving the safety signal ambiguous.

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 purpose is front-loaded and the two sentences on preview/confirmation are efficient and earn their place. However, the money-units sentence has no corresponding parameter here and is dead weight, so the description is not fully tight.

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?

For a two-parameter tool with no output schema, the description usefully explains what the call returns (a preview plus confirmation link) and who can complete the change. Nothing essential for invoking it correctly is missing; the stray money-units line is a minor distraction rather than a 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?

Schema coverage is 100% and both parameters (mode, afterDays) carry full descriptions, so the baseline is 3. The description adds no parameter meaning of its own, and its 'Money is integer minor units (cents)' sentence maps to no parameter in this schema, making it irrelevant rather than additive.

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 opens with a specific verb+resource: 'Set how the shop asks for reviews,' which pins down that this configures review-request behavior rather than individual reviews (reviews_list, reviews_set_status) or notification channels. It is clear on purpose, but it never names or contrasts a sibling tool, so it stops short of the top score.

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?

There is no explicit when-to-use/when-not-to-use guidance and no mention of alternatives such as reviews_list or settings_notifications. The statement about the merchant confirming on a page describes the mechanics of the call, not the conditions under which an agent should choose this tool.

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