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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so safety is covered; the description adds real value by enumerating the returned status values and noting an error carries a reason. Caveat: 'refreshes verification, DNS config, and certificate state' suggests a server-side side effect that sits in mild tension with readOnlyHint=true, though idempotentHint makes a re-poll interpretation plausible.

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?

Front-loaded with the primary purpose, then return values, then error behavior. The 'Inputs:' sentence is redundant with a fully documented schema, but the rest of the text is dense and earns its place.

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 rightly covers return values (status enum, dns_records, error reason) and inputs. It is missing any routing guidance against sibling domain tools and does not clarify the refresh side effect, but for a 3-parameter status check it is largely complete.

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%, so the schema already documents slug, token, and domain. The description only restates the same three names ('Inputs: slug, domain, and token') with no added format, defaults, or interaction detail, so the baseline of 3 applies.

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 ('Returns the verification status of a custom domain') and adds the refresh scope, which separates it cleanly from add_domain/list_domains/remove_domain. An agent can distinguish this status-check tool from its domain siblings without opening a schema.

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?

Usage is only implied: you call this to poll verification progress after attaching a domain. No alternative is named and there is no explicit when-not guidance (e.g., use list_domains to enumerate, add_domain to attach). Adequate but inferential.

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