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

Annotations already declare readOnlyHint=false, destructiveHint=false, openWorldHint=true, so the safety profile is covered. The description adds that the note renders in the console and that an empty value clears it — useful context. It does not disclose how the record is located (all four required fields must match) or what happens on a non-matching record, which is the main behavioral unknown.

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 short sentences, the effect is front-loaded, and the clearing behavior is stated as a compact trailing clause. Nothing is wasted.

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 five-parameter mutation with no output schema and no parameter documentation, the description should explain how the target record is identified and the result of a non-match. Those gaps leave an agent unable to call this confidently with arbitrary inputs.

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% and only the `note` parameter is discussed, including the non-obvious fact that empty clears it. The four required identity parameters (domain, type, name, value) are never explained — that they jointly identify the target record — and the 200-character limit from the schema is not reinforced.

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 and resource ("Write a note on one DNS record") plus the observable effect ("shown next to it in the console"). No sibling tool manipulates per-record notes, so confusion with list_dns_records or set_domain_tags is unlikely, though no sibling is named explicitly.

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?

"Empty note clears it" gives one concrete usage case. However, there is no guidance on when to use this versus stage_dns_change, what preconditions apply, or what happens if no record matches the supplied identity — usage must be inferred.

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