list_dns_subdomains

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

Annotations already supply readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds no behavioral context of its own — no pagination, ordering, auth scope, or result-shape information — so it contributes little beyond the endpoint identifier.

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?

A single front-loaded sentence with the resource and scope stated first and the endpoint given parenthetically; no filler or repetition.

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 one-parameter, read-only list tool with full schema coverage and annotations, the essentials are present, and no output schema means return values need not be described. It still leaves unclear how this list relates to the sibling DNS listing tools, which matters given how many DNS tools share the namespace.

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 fully documents server_id. The phrase 'by server ID' in the description mirrors the schema rather than adding format, range, or lookup semantics, which is the expected baseline of 3.

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?

The description gives a specific verb and resource ('list of subdomains') plus a scoping constraint ('by server ID') and even names the upstream endpoint (pdns/list_subdomains). However, it does nothing to separate itself from the several DNS siblings such as list_dns_domains, list_dns_zones, or get_dns_zone.

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 when-to-use, when-not-to-use, or alternative-naming guidance. An agent must infer from the name alone whether this is the right call versus list_dns_domains or get_dns_zone.

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