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

Annotations already declare readOnlyHint=false, openWorldHint=true and idempotentHint=false, so the safety profile is covered. The description adds that the call performs an immediate live DNS lookup and updates each record's status individually, but says nothing about what happens when a lookup fails, whether statuses regress, or whether repeated calls are safe.

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?

One sentence, no filler, and the action and side effect are front-loaded. Nothing in it is redundant with the title alone.

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 one parameter and no output schema, the definition covers the mechanics but leaves the agent unsure what the call yields (per-record statuses? overall pass/fail?) and how partial DNS failures are reported. For a non-idempotent external-network mutation, a note on outcome or failure behavior would close the gap.

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 single 'id' parameter is documented in the schema as 'Domain ID.' The description adds no format, example, or sourcing guidance for the id, so the schema does all the work and the baseline of 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?

The description names a specific verb pair (look up DNS records, update verification status) and a specific resource (the domain identified by id). It is clearly distinguishable from get-domain (read-only fetch) and update-domain (manual edit) because it performs a live external lookup plus a status mutation.

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?

Usage is implied by 'now' – re-run after DNS changes to refresh verification state – but the description never states when to call it versus get-domain, update-domain, or create-domain, and gives no prerequisites or exclusions. An agent can infer the intent but must guess the trigger conditions.

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