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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety and scope are covered. The description adds only the status filter notion ('awaiting a code or already received'); it says nothing about ordering, what 'recent' means, or pagination behavior beyond the schema's limit field.

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?

One tight sentence with the resource front-loaded and no filler. The only softness is the undefined 'recent', which adds a small ambiguity rather than waste.

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 read-only list with a fully documented single parameter and annotations covering safety, the essential call information is present. However, with no output schema, the description should indicate what an order record contains or how results are ordered, and it does not.

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% and the single 'limit' parameter already documents default 50 / max 1000. The description adds no parameter meaning, so 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 uses a specific verb+resource ('List recent OTP orders') and scopes it to 'the account', which separates it from create_otp_order and cancel_order by action. It stops short of naming a sibling or explaining how it differs from poll_sms/read_rental_sms, which also surface verification data.

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?

The parenthetical '(awaiting a code or already received)' implies the status window an agent should expect, giving some usage context. But there is no explicit when-to-use/when-not guidance and no pointer to alternatives such as poll_sms for fetching the actual code.

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