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

Annotations only carry destructiveHint=true and a title, so the description does real work: it discloses that changes go live and propagate publicly, and that no delete/undo tool is offered here. That meaningfully expands on the destructiveHint flag. It stops short of stating auth requirements, propagation timing, or whether duplicates are rejected.

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 core action, then the consequence, then the reversal path. No filler; the API endpoint reference is compact and additive.

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 6-parameter create tool with no output schema and minimal annotations, the description covers action, live-effect consequence, and reversal, which is most of what an agent needs. It omits what the call returns (e.g. the new record's id), which would be needed for later update/delete operations.

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% and every field (including ttl, priority, and the @ apex convention) is already documented in the schema, so the baseline of 3 applies. The description contributes nothing extra about parameter semantics, such as type/value coupling (MX and SRV needing priority) or how name interacts with domain_id.

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 qualifier 'one' so the agent knows this is a single-record create, not a bulk import. It is trivially distinguishable from the sibling civo_list_dns_records and the broader get/list family.

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 by the create semantics, and the description usefully explains that reversal happens outside this tool ('delete the record in the Civo dashboard or CLI'). However, it never states when to prefer this over alternatives or what prerequisites (e.g. an existing domain from civo_list_dns_domains, or a valid domain_id) are needed before calling.

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