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

Annotations only declare readOnlyHint=false/destructiveHint=false; the description goes further by disclosing the login precondition, the per-call token cost ("호출마다 토큰 1소진"), and that the idempotency key is unavailable to anonymous calls. The idempotency/recovery semantics are explained in real depth, well beyond the annotations.

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-loading the login requirement is good, but the middle is padded with idempotency boilerplate and a confusing clause ("not available to anonymous taste calls"; "provider-specific idempotency_key... it is a different field") that costs more than it earns for a 2-parameter init tool.

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?

Covers auth, idempotency, and token cost for a simple 2-param, no-output-schema tool. It omits what initialization returns or which follow-up tool (e.g., dependent member lookup/save) should be called next, leaving the workflow incomplete.

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. The description nonetheless adds meaning to request_idempotency_key that the schema does not: reuse only to recover a lost-response request, generate a new key for a new execution, and do not conflate it with a provider-specific idempotency_key.

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?

States a specific verb and resource: "Initialize dependent qualification declaration." It is clearly a dependent (피부양자) qualification flow, distinguishable from the acqs/chg/los siblings by the resource name, though it never explicitly contrasts itself with those siblings.

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?

"REQUIRES prior fourinsure__session__login call with same account_link_id" gives a concrete prerequisite, which is useful. But there is no guidance on when to pick this over the sibling inits (acqs_init, chg_init, los_init) or what to do after initialization, so usage is only implied.

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