Change RRSet TTL

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

With idempotentHint annotation already covering idempotency, the description adds the null fallback behavior, which is useful context. However, it does not disclose other behavioral traits such as whether the RRSet must exist, error handling, or side effects beyond TTL change. The added null behavior slightly raises it above baseline.

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 are front-loaded with the core purpose and the key special value behavior. Every word earns its place; no fluff or redundancy.

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 simple, single-purpose tool, the description covers the essential behavior. The schema fully documents parameters, and the description adds the null case. It could optionally mention that only the TTL is changed, not other RRSet properties, but that is already clear from the tool name and purpose. Overall adequate for 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 parameters are fully documented in the schema. The description's 'Pass null to fall back to the zone's default TTL' repeats what the ttl parameter schema already explains, adding no new semantics beyond a concise reinforcement.

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 verb 'Change' and the resource 'Time To Live (TTL) of an RRSet'. It is specific and distinguishes from sibling tools like change_zone_ttl (zone-level) and update_rrset (general RRSet changes). The scope is unambiguous.

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?

No guidance is provided on when to use this tool versus alternatives like update_rrset. The mention of passing null is parameter usage, not tool selection guidance. The description does not explicitly state exclusions or prerequisites.

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