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

With no annotations the description carries the full burden and does disclose non-obvious behavior: the prices_confirmed flag semantics and that calls don't count against the daily quota. Missing are auth requirements and an explicit read-only statement, though 'returns' implies read.

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?

Four short sentences, each carrying distinct information: purpose, the risk flag, the required response behavior, and the quota exemption. The warning is front-loaded with a marker and nothing is padded.

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?

No output schema exists, so the description must convey the return shape; it names the two payload categories and the one flag that governs correctness. It stops short of describing plan fields (name, price, currency, billing period), which an agent formatting an answer would still want.

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?

Zero parameters, so there is nothing for the description to disambiguate and the baseline is 4. The description correctly spends no words on arguments.

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 and resource: returns pricing plans and payment methods. No sibling is named, but the sibling set (about_chatad, get_guides, draft_campaign) is far enough away that confusion is unlikely; the tool still doesn't positively distinguish itself.

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?

Gives clear handling instructions for the unconfirmed-price case (don't invent amounts, say 「확정 전」), which is real usage guidance for the response. It never says when to reach for this tool instead of about_chatad or get_guides, so the when-to-call decision is only implied.

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