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

destructiveHint=true already flags risk, and the description usefully adds that this is a WRITE that goes live immediately on production DNS, which is real context an agent won't get from the annotation alone. It still omits idempotency, permission/API-key requirements, and rate limits.

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 short fragments with the most decision-relevant word ('WRITE') front-loaded and zero filler. The trailing API-path line is informational rather than essential, keeping it just under the top band.

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?

Covers the mutation and live-DNS consequence, but for a 14-parameter create with no output schema it says nothing about what comes back, and the returned record identifier is needed later by bunny_update_dns_record/bunny_remove_blocked_ip-style operations. Adequate but not complete.

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% across all 14 parameters (ttl, priority, flags, weight, type enum, etc.), so the schema already carries full parameter meaning. The description adds no syntax, defaults, or type-conditional guidance beyond that, making the 3 baseline correct.

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 a record to a DNS zone'), which is clearly distinct from bunny_list_dns_records and bunny_update_dns_record by the verb 'add' alone. It does not explicitly name or rule out those siblings, so it falls just short of 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?

There is no guidance on when to use this versus bunny_update_dns_record or bunny_export_dns_zone, and no stated prerequisites (e.g. the zone must already exist). The 'WRITE' marker and 'Takes effect on live DNS' warn of consequence but not of the conditions that select this tool.

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