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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds real value beyond that: prices are yearly and recurring, quoted in BDT, split across register/renew/transfer, and first-year pricing may be discounted — a caveat an agent would otherwise misreport.

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 short sentences, zero filler, with the core payload (prices, currency, price types, batch limit) front-loaded and the pricing caveat second.

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 simple one-parameter read tool with no output schema, the description conveys enough to call it correctly and to interpret results (yearly, BDT, three price types). Only the shape of the per-extension response and handling of invalid extensions are left unstated, which is a minor gap.

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 the parameter. It clarifies that the string array holds domain extensions and caps the count at 40 (mirroring maxItems), but it gives no format guidance (e.g. '.com' vs 'com') and no hint about behavior with unknown extensions, leaving a real gap.

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?

States a specific verb-plus-resource: returns current yearly prices in BDT for register, renew, and transfer across domain extensions. It is clearly distinct from siblings like check_domain (availability) and list_plans, though it never names or contrasts them explicitly.

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 only implied — an agent infers this is a price-lookup step before ordering, but there is no explicit when-to-use guidance, no mention of check_domain or order_link as adjacent steps, and no prerequisites stated.

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