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

No annotations are provided, so the description carries the burden. It discloses important mutation behavior: the change is queued for idempotent provider sync, disabling DNSSEC clears all DS records, omitted fields preserve current values, and expired domains are blocked. It omits auth or rate-limit details, so not a 5.

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?

Four dense sentences, purpose front-loaded, and each sentence adds a unique constraint or behavioral detail. No filler or repetition.

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 4-parameter mutation tool with no annotations and no output schema, the description covers purpose, constraints, and key side effects. It leaves out how to verify the queued sync or handle provider errors, which is a minor gap.

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?

With only 50% schema description coverage, the description compensates by clarifying that at least one optional field must be supplied, that omitted fields keep current values, and that disabling DNSSEC clears all DS records. It does not describe the id parameter or nameserver format, but the schema covers those.

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 (Update) and resource (desired delegation state: nameservers, DNSSEC, DS records) scoped to the caller's active domains. It does not explicitly distinguish this registry-level operation from sibling tools like dns_zone_dnssec or dns_record_update, so it misses the top band.

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?

Gives clear operational context: omitted fields retain values, at least one field is required, and expired domains cannot be updated. It lacks explicit when-to-use guidance relative to sibling tools (e.g., dns_zone_dnssec), so not a 5.

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