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

The readOnlyHint annotation already establishes the safety profile, but the description adds real value beyond it by disclosing the payload scope ('with its settings and records'), which is the key fact an agent needs to choose this over bunny_list_dns_records. It says nothing about auth or payload size limits, keeping it short of 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 operation and payload, followed by the upstream endpoint mapping. Nothing is wasted and nothing needs reordering.

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?

With no output schema, the description does take on the burden of describing the return ('settings and records') and does so adequately for a single-resource read whose safety profile is covered by annotations. Only minor gaps remain, such as whether the records list is truncated or paginated.

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?

There is a single parameter with 100% schema description coverage, so the schema already documents zone_id fully. The description adds no format, range, or sourcing detail beyond the schema, making the baseline 3 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 ('Fetch') and resource ('one DNS zone'), and the singular 'one' plus 'with its settings and records' makes the scope distinct from the sibling bunny_list_dns_zones. It does not name that sibling explicitly, so it falls short of a 5.

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 only implied: fetch a single zone, presumably when you already hold a zone_id. There is no explicit when-to-use statement, no exclusion guidance, and no pointer to bunny_list_dns_zones or bunny_list_dns_records as alternatives.

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