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

Beyond the annotations (readOnlyHint=false, destructiveHint=false), the description adds real operational context: an auth prerequisite, per-call token cost ('호출마다 토큰 1소진'), idempotency behavior, and the note that the key is unavailable to anonymous taste calls. It does not state what server-side state the 'init' creates or how it is consumed downstream, which keeps it from a 5.

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?

Front-loaded correctly, leading with the hard prerequisite before the purpose and the idempotency mechanics. The idempotency boilerplate is somewhat generic-heavy relative to the two optional parameters and could be tightened, but no sentence is pure filler.

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 non-destructive init step with two optional params, no output schema, and annotation coverage, the description supplies the essential missing pieces: auth prerequisite, cost, and idempotency contract. The remaining gap is workflow context — what to call next (e.g., acqs_member_lookup / acqs_save) and what state this initializes.

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 is 3, but the description pays off the schema's forward reference ('see the tool description') by fully explaining request_idempotency_key semantics and clarifying that a provider-specific idempotency_key is a different field. account_link_id semantics are left to the schema, which is adequate.

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+resource: 'Initialize employee qualification acquisition declaration', matching the Korean title. An agent can tell what the tool creates, but there is no differentiation from close siblings such as acqs_precheck, acqs_save, chg_init, dependent_init, or los_init — the caller must infer the workflow position from the '_init' suffix.

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?

The prerequisite is explicit and front-loaded: 'REQUIRES prior fourinsure__session__login call with same account_link_id.' The idempotency-key paragraph gives clear when/when-not rules ('reuse ... only to recover that request', 'use a new key for a new execution'). It stops short of routing between sibling init/lookup/save tools, which is the main missing piece.

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