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

Annotations only give the generic readOnly/destructive/openWorld flags, so the description's disclosure of the ~1 hour DNS propagation latency and the anti-polling instruction adds real behavioral value the agent cannot infer elsewhere. Note the mild tension that readOnlyHint=false is set for what reads like a status query, though the description never explicitly claims read-only.

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 sentences, zero waste: the first states what is returned, the second gives the operational cadence. The most decision-relevant fact (is it live, what's missing) is front-loaded.

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?

There is no output schema, so the description usefully carries the return semantics (live-or-not plus outstanding DNS records) and the timing expectation. Auth/permission details and any failure modes are left implicit, which is the only shortfall.

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 100% and the token parameter is already fully documented in the schema, including the fallback to the Authorization header. The description adds no syntax, format, or sourcing detail beyond that, so the baseline 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 resource and result: whether a domain pending from set_domain has gone live, plus which DNS records are still missing. Naming set_domain as the producer lets an agent place it precisely among siblings such as get_site and set_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 clear standing guidance for the natural follow-up case: after setting a domain, DNS may take an hour to propagate, so 'call again later rather than in a loop.' It does not spell out an alternative tool or an explicit when-not (e.g. if no domain was ever set), which keeps it from a 5.

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