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

Annotations already declare readOnlyHint=true, and the description complements this by adding that the operation is free ('무료입니다') and scoped to the currently authenticated API key. It does not detail rate limits or exact response structure, but for a zero-parameter read-only tool this is reasonable.

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 description is short and front-loaded, but it repeats the same content in English and Korean and redundantly states '무료입니다' and '[무료]'. The core message is clear, but the duplicate free-note is unnecessary and slightly bloats the definition.

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 zero-parameter, read-only account info tool, the description covers what the tool returns (remaining points and account status), the auth scope, and the cost. No output schema exists, so the description's explicit mention of return semantics is sufficient.

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?

The tool has zero parameters, and schema description coverage is trivially 100%. The description does not need to document parameters; the baseline for zero-parameter tools is a 4, and there are no gaps here.

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 ('Check'/'조회') and a specific resource ('APICK account balance and status'/'잔여 포인트와 계정 상태 정보'). It clearly identifies what the tool does and is easily distinguished from the broad sibling list, none of which target account info.

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 description clearly implies when to use the tool: whenever the agent needs the current APICK account balance or status. It does not explicitly mention alternatives or exclusion criteria, but with zero similar siblings and a simple purpose, the context is sufficient.

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