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

With no annotations provided, the description carries the full behavioral burden. It does disclose the read-only, non-mutating nature and enumerates the returned data points, but says nothing about auth requirements, rate limits, or whether output is per-account or per-plan.

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?

A single front-loaded sentence lists the payload contents followed by a two-word safety note; there is no filler. The colon-list format is dense and readable, though 'disclosure' is slightly odd phrasing for a read operation.

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 must describe returns, and it does so by naming the four data points returned. It leaves auth scope and quota semantics (what the quota is measured against) unstated, which is a minor gap for a simple, argument-free read 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?

The tool takes zero parameters, so the baseline of 4 applies. There is no scalar syntax to clarify, and the description correctly adds nothing about inputs because none exist.

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 description names a specific resource (DNS hosting plan) and enumerates exactly what it discloses: monthly price, days remaining, prorated first-month estimate, and zone quota usage. It is clearly distinct from siblings like dns_zones or dns_zone_get, though it never explicitly contrasts itself with them.

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?

There is no statement of when an agent should call this versus alternatives such as dns_zone_get or dns_zones. The only usage signal is the trailing 'Read-only', which implies safety but conveys no triggering context or prerequisites.

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