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

Annotations only supply destructiveHint=true; the description adds real value beyond that by disclosing that changes are live and propagate globally, and by naming the only rollback path (dashboard/CLI deletion). It does not mention required permissions or duplicate/collision behavior, 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?

Three tight sentences, front-loaded with the action, then the propagation/rollback caveat, then the API route. The endpoint line ('POST /v2/dns/{domain_id}/records') is mildly redundant with the tool's purpose but confirms the method.

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 mutation tool with no output schema, the description covers irreversibility and propagation, which is what an agent most needs. It leaves out failure modes (duplicate records, permission errors) and confirmation of what is returned, but nothing critical to invoking it correctly 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 100%, so every parameter including enums, TTL bounds, and the apex '@' convention is already documented in the schema. The description adds no parameter-level detail, which is the expected baseline when the schema does the work.

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 and resource ('Add one record to a Civo-hosted domain') with the scope limited to a single record, which cleanly separates it from civo_list_dns_records in the sibling set. An agent can identify the operation without opening the schema.

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?

Usage is implied rather than stated: you call it when you need to create a DNS entry for a hosted domain. The line about undoing via the dashboard/CLI usefully signals there is no paired delete tool, but there is no explicit when-to-use or when-not-to-use guidance.

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