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

Annotations already mark readOnlyHint=false and non-destructive; the description adds real value beyond that by disclosing per-call token consumption ("호출마다 토큰 1소진"), that a backend XBOSS job is created and its result stored, and that the call is explicitly not purely read-only. The idempotency contract (new key per execution, reuse only to recover a lost response) is spelled out in a way no annotation covers.

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 correctly front-loaded, but the body is padded with repeated idempotency boilerplate and a mixed Korean/English block whose relevance to the caller is only loosely connected to validation. Several sentences restate the same key-reuse rule in different words.

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?

Auth requirement, cost, side effects, and key handling are all covered, and the input schema description supplies the return shape (missing_required_fields, field_errors) and the "nothing is saved or submitted" guarantee. What is missing is the relationship to the init sibling that opens the form, which is the single most important routing fact for this tool.

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 the baseline is 3; the description earns a step up because the schema for request_idempotency_key explicitly defers to the tool description, and the description pays that off with concrete generate/save/reuse/recover semantics and the warning not to confuse it with a provider-specific idempotency_key.

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?

"Validate payroll amount change draft without submission" gives a specific verb (validate), resource (payroll amount change draft) and a clear non-effect (no submission). It does not name the companion sibling fourinsure__b1__payroll__amount_change__init, which is the step that must precede it — that link only appears in the input schema description, not here.

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?

It states the hard prerequisite (prior fourinsure__session__login with the same account_link_id) and thoroughly explains when to reuse vs. regenerate the idempotency key. However, it never says when to call this versus draft_validate-type siblings or the init step that produces the form, so the workflow position is only implied.

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