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

Annotations declare non-read-only, non-idempotent, closed-world; the description corroborates and enriches this by stating the key is issued only once (consistent with idempotentHint=false) and that it must never be sent anywhere except trading.pe.kr (consistent with openWorldHint=false). It does not cover failure modes (unapproved application, expired token) or auth requirements, so not a 5.

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?

Front-loaded with the action and one-time constraint, followed by handling instructions; no filler. Slightly dense with handling/security guidance that could be trimmed, but every sentence is relevant to correct invocation.

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?

With no output schema, the description usefully explains the returned key's format (tpk_…) and its one-time nature, which is what an agent most needs. It leaves the undocumented application_id and error/precondition behavior unexplained, so it is not fully complete.

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 50%: claim_token is documented there, but application_id has no description anywhere. The tool description adds no parameter meaning at all (no format, source, or role for application_id), so it fails to compensate for the 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+resource: claims the API key (tpk_…) for an approved application, once. The qualifier '승인된 신청' (approved application) plus the sibling apply_for_key/check_application set makes it clear this is the post-approval retrieval step, not the application step.

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 context: only for approved applications, and the key can be claimed only once, plus what to do with the result (store safely, put in the Authorization header). It does not explicitly name the alternative siblings (apply_for_key, check_application) or state when-not-to-use, so it falls short of a 5.

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