Switch to optional ArvanCloud NS keys

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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the [WRITE] tag largely repeats the safety profile rather than adding to it. The description does not say what happens to existing NS keys, whether the change is reversible, or what 'Offline FA' means, leaving real behavioral gaps for a mutation tool.

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?

It is short and front-loads the [WRITE] marker, so it is efficient. But 'Offline FA' is opaque filler that costs tokens without informing the agent, and the terseness crosses into ambiguity.

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 single-parameter mutation with no output schema, the description should at least clarify what the toggle does to existing records and any preconditions. Neither the description nor the annotations cover that, so the definition is thin for the complexity of the operation.

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 domain parameter, so the description must carry the burden. The endpoint string /domains/{domain}/ns-keys/use-optional-keys implicitly shows where the domain goes, but it adds no format, validity, or scoping detail beyond that.

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 action ('Use optional NS keys') with a parenthetical hint about the style, and the endpoint mapping anchors it to a concrete resource. However, the concept is niche jargon, and it does not differentiate itself from close siblings like set_domain_nameservers or check_domain_nameservers, so an agent could confuse 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 to use this tool versus alternatives such as set_domain_nameservers, nor any prerequisite (e.g. that the domain must belong to the account, or that this toggles an existing NS setup). Usage is left entirely to inference from the name.

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