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

Beyond the annotations (which already flag a non-readonly, idempotent, non-destructive operation), the description discloses the privilege requirement ('full_access' API key) and the fact that state changes are observable only via a later read. That privilege gate is genuinely additive context an agent cannot get from the annotations.

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?

Four short lines, front-loaded with the intent, then behavior, then follow-up, then auth. The opening 'Verify a domain.' duplicates the title and the trailing 'Domains' category tag adds nothing, but no sentence is otherwise wasteful.

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?

With no output schema, the description correctly tells the agent that the result must be read via a subsequent domain fetch rather than returned here. Auth requirement and endpoint are covered; what remains thin is the parameter itself, which is the one gap for a one-param tool.

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 0% for the single `id` parameter, so the description would need to compensate. It does so only indirectly through the endpoint path 'POST /domains/{id}/verify', which implies `id` is the domain identifier, but it never states the format or where to obtain the value.

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 title line is a restatement, but 'Re-checks DNS now' supplies the actual semantics: this triggers a live DNS re-verification of an existing domain. That distinguishes it meaningfully from get_domain (read-only) and update_domain (configuration), even without naming those siblings.

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 an explicit follow-up workflow ('Retrieve the domain afterwards to read the new status and per-record statuses') which routes the agent to get_domain after the call. What's missing is any exclusion: when not to call it, e.g. before records are set, or whether it is safe to call repeatedly during pending verification.

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