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

Annotations only declare readOnlyHint/destructiveHint; the description adds meaningful behavior beyond that: the required authentication state, per-call token consumption ('호출마다 토큰 1소진'), and idempotency semantics including what happens when no key is supplied. The opaque sentence about the key being 'not available to anonymous taste calls' is confusing and detracts slightly.

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, but the core purpose statement is buried behind it and the idempotency guidance sprawls across five sentences, one of which ('anonymous taste calls') is unclear filler. The token-cost note is useful but tacked on in Korean at the end.

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?

With no output schema, an agent is left not knowing what the init returns (e.g., a prepared application handle or reference data) or what step follows, which matters for an init tool in a multi-step flow. Auth and idempotency are well covered, so it is adequate but not complete.

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 the baseline is 3, but the description adds real semantics the schema defers on: the idempotency key is for recovering a lost-response request with identical arguments, a new key is needed for a new execution, and provider-specific idempotency_key fields must be left untouched. account_link_id meaning is left entirely to the 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?

States a specific verb and resource: 'Initialize auto transfer cancellation application,' which an agent can act on directly. It does not, however, distinguish this tool from adjacent init-style siblings (e.g., fourinsure__b1__workplace__withdrawal__init) or describe what the initialization produces.

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?

Explicitly states the prerequisite: 'REQUIRES prior fourinsure__session__login call with same account_link_id,' which is the key gating condition. It also gives a concrete reuse-vs-new-key policy for request_idempotency_key, but names no exclusion or alternative tool for a different situation.

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