Change DNS Zone RRSet TTL

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

Annotations already indicate idempotent and non-destructive behavior. Description adds the null fallback behavior but does not disclose other aspects (e.g., what happens if RRSet has records, TTL limits, or error scenarios). Acceptable but not enhanced beyond annotations.

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 sentences, no redundancy, every word adds value. The core functionality and a special case are delivered efficiently.

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 tool with 4 required params and no output schema, the description covers the essential function and null behavior. It is complete enough to guide usage, though it could mention prerequisites like existence of zone/RRSet.

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?

All 4 parameters are fully described in the input schema (100% coverage). The description repeats the ttl null behavior already in the schema, adding no new semantic information beyond what the schema provides.

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?

Clearly states it changes the TTL of an RRSet, distinguishing from sibling tools like hetzner_change_zone_ttl which modifies the zone default TTL. The verb 'change' and resource 'RRSet TTL' are precise.

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?

Provides the key usage nuance: passing null to fall back to zone default. However, no explicit guidance on when to use this tool versus alternatives like hetzner_update_zone_rrset, nor any contraindications.

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