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

Annotations only declare readOnlyHint=false and destructiveHint=false; the description adds substantial context beyond that — the login prerequisite, idempotency lifecycle, the note that the provider-specific idempotency_key is a different field, and the cost signal ('호출마다 토큰 1소진'). The 'anonymous taste calls' phrase is a garbled artifact that slightly muddies an otherwise rich disclosure.

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 prerequisite is front-loaded, which is good, but the idempotency-key rules sprawl across four sentences with repetition ('Without it, calling again remains a new request') and a confusing 'anonymous taste calls' clause. It could be tightened without losing meaning.

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?

Covers auth requirement, idempotency, and per-call cost, which are the key risks. For an init tool it never explains what the initialization produces (a session/handle) or how it hands off to fourinsure__b1__certificate__apply__submit, which is a meaningful gap given no output schema exists to clarify the return.

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 100%, so both parameters are already well documented. The schema explicitly defers the request_idempotency_key meaning to the description, and the description does explain its lifecycle, but it adds behavioral life-cycle context rather than format/semantic detail beyond the schema — so the baseline 3 holds.

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 ('Initialize 4대보험 certificate application'), which is clear and distinguishes it from the submit sibling by its initialization phase. However, it never explicitly names the submit/follow-up tool or states that a template is being prepared for a later 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?

Clearly states the prerequisite ('REQUIRES prior fourinsure__session__login call with same account_link_id') and gives precise conditions for the idempotency key (generate before first request, reuse only to recover a lost response, new key for new execution). It lacks guidance on when to prefer this tool over the __submit sibling, keeping it below 5.

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