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

With no annotations, the description carries the full burden, and it does disclose two behavioral facts an annotation would normally cover: it is read-only, and non-owned ids yield a 404. It omits auth requirements, rate limits, and pagination behavior for the embedded records list, so it stops short of full transparency.

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 tight sentences, zero filler, with the highest-value information (what is returned) front-loaded and the caveat trailing. Nothing is redundant.

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?

No output schema exists, so the description usefully previews the return shape (summary fields plus all records) and the failure mode. For a single-parameter read tool this is nearly sufficient, though it could note record volume or whether records are 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?

One parameter at 0% schema description coverage, so the description must compensate. It adds real meaning to zoneId by revealing the ownership constraint (non-owned ids return 404), but says nothing about format or where a valid id comes from, so the uuid typing rests entirely on the schema.

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 ('Get') and a singular resource ('one DNS zone panel'), then enumerates the payload (zone summary with status, driver, sync state, DNSSEC, plus all records). This clearly separates it from the list sibling dns_zones and from record-level siblings like dns_record_update/dns_zone_export.

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: an agent can infer this is the single-zone detail fetch, but the description never says when to prefer it over dns_zones, dns_zone_export, or the dns_record_* tools. The 'non-owned ids return 404' note is an error condition, not selection guidance.

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