Update DNS Zone RRSet

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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=true. The description adds that only labels are updated and that records/TTL are not touched, which is useful but limited. It doesn't describe side effects like whether the RRSet must exist, permission requirements, or response behavior. The description adds some context beyond annotations but not rich behavioral detail.

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?

The description is a single sentence that front-loads the main action and immediately clarifies scope. It contains no filler and every word adds value.

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?

Given the simplicity of the tool (update labels) and the completeness of the schema, the description adequately covers what an agent needs to decide to use it and what it does. It explains that records and TTL are managed separately, preventing misuse. There's no output schema, but the description doesn't need to explain return values. It could mention that labels are optional in the schema, but that's not essential for correct invocation.

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 100%, so the schema fully documents each parameter: name, type, labels, and id_or_name. The description does not add any additional meaning about the parameters themselves. Per the rubric, baseline 3 is appropriate when schema coverage is high and the description contributes no extra parameter semantics.

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 clearly states the action: 'Update an RRSet's labels.' It specifies the resource (RRSet) and the specific aspect (labels), which distinguishes it from other RRSet-related tools like record management or TTL changes. The phrase 'Records and TTL are managed via dedicated action tools' further clarifies its narrow scope.

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 description implicitly indicates when to use this tool: when you need to update labels only, and points out that records and TTL are handled elsewhere. It doesn't name the specific alternative tools, but the context is clear. This provides adequate usage guidance, though naming the tools would make it more explicit.

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