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

With no annotations, the description carries the full disclosure burden and does well: it identifies the authoritative data source, implies reporting lag via '신고 데이터', documents the suppressed/fallback_region edge case, and states that responses include page_url or per-item url. It omits pagination, response size, and any latency or rate-limit context.

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 purpose and data-source caveat are front-loaded, and each subsequent sentence handles a distinct case (no region, suppressed sample, page_url). It is dense with instructions but no sentence is redundant; slight tightening would earn a 5.

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 one-parameter statistics tool with no output schema, the description covers the key unknowns: what the data source is, what happens with no region, how to handle suppressed regions, and what URL fields are returned. An agent can call this and interpret the response correctly without further information.

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% and the single region parameter is fully documented in the schema, including the omit-to-list-regions behavior, so the baseline is 3. The description reinforces the omitted-region semantics but adds no new format or matching details beyond what the schema 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 names the resource precisely: 제주 아파트 실거래 시세 통계, sourced from 국토교통부 실거래 신고 데이터, explicitly excluding asking prices (호가 아님). This cleanly separates it from listing-oriented siblings such as search_property_listings or upsert_property_listing, though no sibling is named outright.

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 a clear conditional usage path: call without region to get the list of supported regions, and on suppressed=true re-query with fallback_region rather than reporting 'no data'. It also tells the agent to surface page_url to the user. The only gap is that no alternative sibling tool is suggested for adjacent tasks.

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