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

Adds real value beyond readOnlyHint/destructiveHint: no authentication needed, and a per-call cost ('호출마다 토큰 1소진'). However, the long idempotency-key paragraph is boilerplate that reads as contradictory for an anonymous read tool — it describes authenticated-call semantics and then says the key 'is not available to anonymous calls', leaving the agent unsure whether the parameter is usable here at all.

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?

Purpose and the cert_template linkage are correctly front-loaded in the first two sentences, but three sentences of idempotency boilerplate follow for a login-free, single-optional-param read. That material does not earn its place here and dilutes the actionable guidance.

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 simple zero-required-param read with annotations declaring it safe and non-destructive, the definition covers auth posture, cost, and how to consume the returned slugs downstream — enough to call it correctly. The remaining gap is the confusing idempotency paragraph, which is noise rather than a missing requirement.

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% and there is only one optional parameter, so the baseline is 3. The description does discuss request_idempotency_key, but its guidance is muddled given the tool requires no credential, adding confusion rather than clarifying when (if ever) the key should be supplied.

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 — list the certificate templates that can be applied for — and quantifies the result set ('9'), which tells an agent it is fetching a small fixed catalog rather than paging a variable record set. It also implicitly separates itself from hometax__certificate__list by framing the output as applicability templates rather than issued certificates.

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?

Gives a concrete downstream rule: 'The slugs returned here are exactly the values accepted by cert_template; nothing else is,' which effectively tells the agent to call this before apply_with_template. It also states the precondition ('No credential or login required'). It does not explicitly name the sibling tools or say when this call can be skipped.

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