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

Annotations already establish readOnlyHint=true, so the safety profile is clear. The description adds meaningful behavior beyond annotations: pricing is in CAD, limited to standard TLDs, and premium-domain pricing is explicitly non-authoritative until checkout recalculates it.

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 sentences, front-loaded with the core behavior, with zero redundant wording. The premium-pricing caveat is placed second, where it reads as a qualification rather than a distraction.

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 and no schema descriptions, the definition should do more to explain what a quote response contains and how years affects pricing. The CAD/standard-TLD/premium caveats are helpful but leave the return shape and term-length behavior underspecified.

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 0%, so the description must carry parameter meaning. It covers the operation values (register, transfer, renew) and implies domain, but never explains the years parameter or its 1–10 range, leaving a meaningful parameter undocumented.

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 ('Return') and resource ('current standard CAD TLD pricing') and enumerates the three operations. It differentiates somewhat from sibling quote_public_product by scoping to TLD pricing, though it does not explicitly contrast the two.

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 implied by 'Return pricing for registration, transfer, or renewal,' but the description gives no explicit guidance on when to use this versus check_domain_availability or quote_public_product. The premium-pricing caveat is useful context but not a routing rule.

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