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

Beyond the annotations (readOnlyHint=false, destructiveHint=false), the description discloses real behavioral traits: each call consumes one token, a request creates an XBOSS job and stores the processing result, and the call is explicitly stated not to be purely read-only despite reading from agency source data. This resolves the tension an agent would otherwise feel between 'validate' and readOnlyHint=false. It loses a point for the trailing generic sentence about '기관 데이터 변경은 도구별 실행 내용과 기존 확인 절차를 따릅니다', which defers rather than informs.

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 and purpose lead, which is good, but the idempotency section runs several sentences of recovery mechanics that partially restate the schema field, and the closing Korean boilerplate about XBOSS jobs and per-tool confirmation procedures is generic filler. Tighter phrasing would preserve all the useful information at roughly half the length.

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 two-parameter, non-nested validation tool with no output schema, the description covers prerequisites, side effects, token cost, and idempotency behavior, which is close to complete. Return-value shape (missing_required_fields, field_errors) is documented in the input schema description rather than here, so that gap is covered elsewhere.

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 already 100%, so the schema carries baseline meaning, but the description adds genuine semantics for request_idempotency_key: generate one before the first request, reuse it only to recover that same request after a lost response, use a fresh key for a new execution, and keep any provider-specific idempotency_key distinct. It also explains the authentication scoping of the key. It adds nothing about account_link_id beyond what the schema already states.

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 states a specific verb and resource: validate a business establishment declaration draft, explicitly 'without submission'. That cleanly separates it from a submit-style operation and from the init sibling. It does not, however, distinguish itself from the many other domain-suffixed draft_validate siblings, so a 4 rather than a 5.

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 gives a hard prerequisite ('REQUIRES prior fourinsure__session__login call with same account_link_id') and a clear scope condition (validation only, no submission), which is actionable context an agent needs before calling. It stops short of naming an alternative to use when the caller actually wants to persist or submit the declaration, so no exclusions are stated.

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