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

No annotations are provided, so the description carries the full burden. It discloses the managed-domain scope and the cost of 3 tokens, but does not mention error behavior, read-only nature explicitly, or pagination. These are useful but not comprehensive disclosures.

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 sentences, front-loaded with the core purpose, followed by usage constraint and cost. Every sentence earns its place with no redundancy.

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 single-parameter list tool with an output schema, the description covers purpose, usage, alternative, and domain constraint. It omits minor details like response format, but the output schema compensates, making this fairly 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?

The schema already covers the single 'domain' parameter with a clear description. The tool description adds value by further narrowing the parameter to 'this Vee3 account manages' and 'managed Namecheap DNS only', which clarifies what domains are valid beyond the schema text.

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 clearly states 'List DNS host records for one domain this Vee3 account manages' with a specific verb and resource, and immediately distinguishes itself from the sibling tool domains.dns_records by scoping to managed Namecheap DNS.

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?

Explicitly states 'Use for managed Namecheap DNS only' and 'For public DNS lookup of any domain, use domains.dns_records instead', giving clear when-to-use and when-not-to-use guidance with a named alternative.

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