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

With no annotations, the description carries the full burden; it usefully discloses a side effect ('verifies the account when it is'), which tells the agent this is not a pure read. However it omits what happens on failure, whether the check is idempotent or safe to repeat while DNS propagates, and whether verification is consumed.

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 short clauses with the action front-loaded and the outcome second; no filler. It is arguably over-compressed rather than padded, but structurally sound.

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 single-parameter tool with no output schema, the description is minimally adequate: it conveys purpose and the key side effect. It leaves gaps on the parameter's origin, failure/retry behavior, and what a negative result looks like, which an agent needs to call this correctly in a verification flow.

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?

One required parameter (verification_id) with 0% schema description coverage, and the description never mentions it. The agent must guess where verification_id comes from (presumably start_dns_verification) and its format. The description does not compensate for the schema 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 check action on a specific resource (TXT record visibility) and the resulting effect (account verification). It is distinguishable from start_dns_verification and get_verification by the 'check' semantics, though it never names those siblings explicitly.

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: an agent can infer this runs after start_dns_verification has issued the TXT record. There is no explicit statement of when to call this versus get_verification or confirm_email_verification, and no prerequisites or timing guidance (e.g., DNS propagation delay).

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