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

Annotations already declare destructiveHint=true, idempotentHint=false, readOnlyHint=false. The description adds value beyond that by spelling out permanence/irreversibility and the provider-ID provenance requirement. It does not cover permissions, behavior on an unknown/invalid ID, or what happens to dependent records, 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?

Two short sentences, front-loaded with the destructive nature and followed by the required precondition. No filler, no 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?

An output schema exists, so return values need not be described. For a two-param destructive tool the description covers the essential danger signal and the ID-sourcing prerequisite. Gaps remain on the meaning of 'domain' and error behavior, but nothing critical to invoking it safely is missing.

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%, so the description must compensate. It partially does: it explains that dns_zone_record_id must be the exact ID returned by the provider (a real usage constraint). But the required 'domain' parameter is never explained — whether it is the zone, the registrant domain, or must match the record's parent — leaving half the parameters ambiguous.

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 names a specific verb and resource ('Permanently delete a managed DNS record'), plus a critical scope qualifier 'permanently' that distinguishes it from update_dns_record/configure_dns_record. An agent can tell instantly that this is the destructive removal path in the sibling set.

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?

It gives an explicit prerequisite workflow: 'Call list_dns_records first and pass the exact DNS zone record ID returned by the provider.' That is concrete when-to-use guidance tied to a named sibling. It lacks explicit when-not-to-use or exclusion rules (e.g., versus update_dns_record), which keeps it below a 5.

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