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

With no annotations, the description carries the full burden and does well: it discloses the permission requirement (owner only), the default value (1 day), the disable semantics (0 turns it off), the null-link behavior (no email), and the prerequisite mailing address because review emails render shop name and address in the footer. It doesn't state whether existing settings are overwritten or what a successful call returns.

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?

Purpose is front-loaded in the first clause, and every subsequent sentence adds a real constraint (default, disable, prerequisite). It reads as a dense run-on paragraph, so a short structured break would improve scanning, but there is no 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?

For a 4-parameter mutation tool with no annotations and no output schema, the description covers permissions, defaults, disable behavior, and the mailing-address prerequisite. It stops short of describing the response or confirming that repeated calls overwrite prior settings, which an agent would want to know.

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%, so the description must compensate, and it largely does: review_url is constrained to https, days is explained semantically (default 1, 0 disables), and mailing_address is explained as the prerequisite that can be supplied here. Only shop_id is uncovered, and the schema's max bounds (days ≤ 30, string maxLengths) are not restated.

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 pair: 'Set the review link ... and how many days after an invoice is paid the customer gets one email asking for a review.' It also scopes the tool (owner only) and implicitly separates it from sibling settings tools like shops_setInvoiceReminders and shops_setQuoteFollowup by naming the exact email trigger.

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?

It gives concrete conditions: 'owner only', 'No link means no email', 'Default 1 day; 0 turns it off', and a prerequisite that a link can only be set once the shop has a mailing address. It doesn't name a sibling alternative to use instead, but the when/when-not conditions are otherwise explicit.

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