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

Annotations already flag a non-read-only, non-idempotent, open-world operation, and the description adds genuinely new behavior: the ordered fallback across lookup methods and the critical fact that publish_key is returned only once. It omits what happens on failed verification (error vs. partial result), which is the main remaining gap.

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 with zero filler: the verification method order first, then the important return-value caveat. Nothing is buried and nothing is redundant.

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 does well to disclose the publish_key return and the show-once caveat. But for a mutating, non-idempotent verification step it should also cover failure modes and the hostname format, leaving the definition only partially 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 0% for the single required parameter, so the description carries the full burden and does not mention hostname at all. It never clarifies whether the value should be a bare domain, a subdomain, or a URL, which is a realistic ambiguity for this kind of input.

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 action (check a published verification token) and resource (domain token), and enumerates the three lookup locations (file, meta tag, DNS TXT). It implies but never explicitly names the relationship to the sibling request_domain_verification, so an agent must infer that verification is a separate follow-up step.

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?

The phrase 'the published token' hints that a token must already exist and be published, but the description never says to call request_domain_verification first or when verification should be retried. Usage is implied rather than stated, and no exclusions or alternatives are given.

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