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

Beyond the annotations, the description discloses several non-obvious traits: authentication is required, each call consumes one token, an XBOSS job is created and its result stored, and the call is explicitly not purely read-only even though it reads. This is exactly the kind of side-effect context the readOnlyHint=false flag alone cannot convey. There is mild internal tension between 'does not save or submit' and 'stores the processing result', but it is scoped to the agency source versus internal storage.

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 bloated and repetitive – the idempotency rule is restated three ways ('Reuse it...', 'Without it, calling again remains a new request', 'not available to anonymous taste calls') and the token/XBOSS paragraph reads like injected boilerplate. Mixed-language sentences slow parsing without adding decision-relevant information.

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 zero-required-parameter precheck with no output schema, the definition covers prerequisites, side effects and the idempotency contract. It never states what the check actually returns (presumably a count of existing entries) or what an agent should do with that result, leaving a meaningful gap for a tool whose entire value is its answer.

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 baseline would be 3, but the description adds real meaning: request_idempotency_key must be generated and saved before the first request, reused only with identical arguments to recover a lost response, replaced for a new execution, and it excludes anonymous calls while remaining distinct from a provider-specific idempotency_key. The account_link_id prerequisite (same link ID as the login) and the parent-coverage-number semantics of up_cvrc_no are also reinforced.

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 core sentence identifies a concrete check – counting existing entries under a parent coverage number before an acquisition report is written – which is a specific verb+resource. However, this is buried in mixed Korean/English boilerplate about tokens, XBOSS jobs and idempotency, and no sibling (acqs_init, acqs_save, acqs_draft_validate) is named to disambiguate. An agent can grasp the intent but must work through noise to get there.

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?

'자격취득 신고서를 쓰기 전에' implies a timing condition (call this before writing the report), and the first line states a hard prerequisite (prior login with the same account_link_id). No explicit when-not or named alternative tool is given, so routing among the several acqs_* siblings is left to inference.

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