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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description still earns credit by disclosing return shape and the status vocabulary (waiting for payment, registering, registered), plus a 'live on the site' flag, payment amount and expiry. Pagination/result-limit behavior is unstated, which keeps it off a 5.

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?

Two compact sentences: the resource and ordering come first, the returned fields second, and the usage cue last. No filler. The telegraphic field list reads slightly like shorthand but every clause carries 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?

For a simple two-parameter read with no output schema, the description effectively doubles as a return-value contract by enumerating status, live state, price and expiry. What remains missing — pagination, empty-result behavior, and how the site is identified — is minor against 100% schema coverage and full annotations.

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 100% and both parameters (site_id, user_goal) are documented in the schema, so the baseline is 3. The description adds no extra meaning about scoping by site or how user_goal influences results, so it neither compensates nor detracts.

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?

Names a specific resource (domains bought for a site through Mondovo) and a sort order (newest first), which is far more than the title's vague 'orders for a site'. It clearly is not a search or purchase tool, though it never names the siblings it should be distinguished from (search_domains_to_buy, start_domain_purchase, claim_domain, verify_domain).

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?

Gives an explicit usage framing: 'Use it to answer "is my domain ready?"' — an agent can map a user question onto this tool directly. It stops short of when-not guidance, e.g. that it will not find domains to buy or that in-flight purchases should be checked via start_domain_purchase/verify_domain.

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