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

With no annotations, the description carries the full burden and discloses key behavioral details: cost composition (100 service tokens + renewal price), dependency on billing plan, and premium domain limitations. However, the trailing 'Cost = 5 tokens' is ambiguous and could confuse rather than clarify.

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 first sentence is clear and front-loaded, but the final 'Cost = 5 tokens.' is cryptic, unnecessary, and disrupts the flow. It appears to be a stray note that detracts from overall conciseness.

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?

The description covers prerequisites, cost calculation, and usage context. An output schema exists so return values need not be described. However, it omits error behavior (e.g., unmanaged domains) and contains the confusing 'Cost = 5 tokens' line, slightly reducing completeness.

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 coverage is 100%, so both parameters are fully described. The description adds no new meaning beyond echoing 'managed domain and year count'; the premium domain restriction is already present in the years parameter's schema description.

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 'Quote renewal cost in tokens for one managed domain and year count' with a specific verb and resource. It also distinguishes itself from sibling tools like domains.renew and domains.registration_quote by explicitly limiting to managed domains and recommending use before renewal.

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?

It explicitly states 'Only works for domains already managed by this Vee3 account' and 'Use before domains.renew', providing clear when-to-use and an explicit alternative integration. The premium domain 1-year constraint is also highlighted.

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