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

With annotations already declaring readOnlyHint=false and destructiveHint=false, the description adds genuinely useful behavior: one token is consumed per call, request processing creates an XBOSS job and stores its result, and the call is explicitly 'not purely read-only' despite being a validation. It also discloses the idempotency contract (new key per execution, reuse only to recover a lost response) and that anonymous/test calls cannot use the key, which the annotations do not cover. Minor weakness: it leaves an internal tension with the schema text that says 'Nothing is saved,' without reconciling what a stored processing result means.

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 and the core purpose sentence follows, which is good ordering. But the middle block is repetitive boilerplate ('Without it, calling again remains a new request'), mixes English and Korean without a clear boundary, and contains a garbled phrase ('anonymous taste calls'). Several sentences restate the same idempotency idea 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?

For a two-parameter, non-destructive validation tool with no output schema, the definition covers the essentials: auth prerequisite, cost, server-side side effects, idempotency, and (via the schema text) that the response reports missing_required_fields and field_errors. The only real gap is the missing sequencing tie to chg_init, which lives in the schema description rather than the tool description.

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 fully documented in the schema, setting the baseline at 3. The description does add meaning for request_idempotency_key (generate and save before first request, reuse only for lost-response recovery, and distinguish it from a provider-specific idempotency_key field), but it says nothing about account_link_id beyond the login-matching prerequisite. Net addition is modest over an already-complete schema.

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 an employee qualification change draft without submitting it. That is clearly distinct from a save/submit operation, though it never names its actual siblings (acqs_draft_validate, dependent_draft_validate, los_draft_validate) to explain why an agent would pick this one over them. The purpose sentence is also buried behind an authentication prerequisite rather than front-loaded.

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 real precondition (a prior fourinsure__session__login with the same account_link_id) and states the call does not submit, which implies it is a pre-flight step. However, it never says explicitly when to use this versus the chg_init or a save tool, and the guidance about key reuse is about idempotency mechanics rather than tool selection. Usage is implied rather than spelled out.

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