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

Annotations declare destructiveHint=true and readOnlyHint=false, yet the description frames the tool purely as a lookup that 'return[s] its status' and never explains any mutation, side effect, or reason a check would be destructive. The status definitions explain what the results mean, but the tool's actual behavioral risk profile is left undisclosed and unreconciled with its annotations. No explicit safety claim is contradicted, so this is a transparency gap rather than a hard contradiction.

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?

The core action is front-loaded in the first clause, followed by invocation timing and then a compact status glossary. It is dense and slightly run-on, but every clause carries information an agent needs; nothing is filler.

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?

There is no output schema, so the enumeration of awaiting_dns/pending/active/error return states is a genuinely valuable addition that the structured fields do not provide. For a 3-parameter tool with fully documented parameters, little else is missing besides an explanation of the destructive annotation.

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%: host, node_id, and service_name are each documented in the schema, including that node_id comes from nerdit_list_nodes. The description adds no parameter-level detail beyond that (no format or linkage notes), so the schema does the heavy lifting and the baseline 3 applies.

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 states a specific verb and resource set: it looks up one domain's CNAME and certificate and returns status, and the 'one domain' scope separates it from the list-style sibling nerdit_list_domains. It never names a sibling or explicitly contrasts with nerdit_add_domain/nerdit_remove_domain, so an agent must infer the routing. Clear, but not sibling-differentiating.

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?

Timing is explicit: 'Call it after the owner created the record, and again later while the status is pending (DNS changes can take a while to reach us).' That tells the agent both when to invoke it and that repeated polling is expected. No when-not-to-use guidance or named alternatives are given, so it stops short of a 5.

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