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

With no annotations, the description carries the full behavioral burden and does real work: it discloses a conditional side effect (activation happens only when delegation is satisfied), states idempotency, and says it returns the new status. It omits what happens on failure/unsatisfied delegation and any permission or rate-limit requirements, which keeps it short of a 5.

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 tight sentences: the core action and its condition come first, and the idempotency/return note follows. Nothing is redundant or padded.

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 one-parameter tool with no output schema, the description usefully notes that it returns the new status, covering the return-value gap. It is nearly complete; the residual gap is the undocumented zoneId semantics and failure behavior.

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 'zoneId' (UUID), so the description must compensate and does not: it never explains that zoneId identifies the pending zone or what form it takes. The word 'zone' only loosely implies the parameter's meaning, leaving the agent to infer it from the sibling ecosystem.

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 verb ('verify') plus resource ('DNS zone') and the exact action taken: check public NS delegation for a pending/external zone and activate it once delegation holds. This is clearly separable from sibling reads like dns_zone_get or dns_zone_dnssec, so the agent can pick it without opening schemas.

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 'for a pending (external) zone' scopes usage well: it applies only to zones awaiting external delegation, not general zone inspection. It stops short of naming the alternative (e.g., use dns_zone_get to merely read status) or stating a when-not condition, so it is clear context but without explicit exclusions.

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