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

Annotations already declare readOnly, idempotent, closed-world and non-destructive, so the safety profile is covered. The description adds value beyond them by disclosing what each returned item contains — a stable ID, a one-line summary, and a verification tier — which matters because there is no output schema. Pagination or result-count behaviour remains unstated.

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?

Two sentences, front-loaded with the core action, then the domain examples and per-item fields. The Japanese parentheticals earn their place by pinning down what counts as a 'document', though the list is slightly long for its purpose.

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 one-optional-parameter listing tool with no output schema, the description covers domain scope and the shape of each returned record. Only ordering/pagination and the absence of user scoping are unaddressed, which is minor at this complexity.

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 the single 'category' enum is fully documented in the schema itself. The description never mentions the category filter or its semantics, so it adds nothing beyond structured data; baseline 3 applies.

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 all Easy Japanese documents on yasashii.org') and scopes it with concrete domain examples (転入届, 国民健康保険, 避難所). The plural 'list all' implicitly separates it from get_document, but no sibling is named, so the differentiation is left to inference.

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?

Usage is only implied: 'List all' suggests a browse/enumerate step that would typically precede a get_document lookup by ID. There is no explicit when-to-use, when-not-to-use, or pointer to search_terms as the alternative for keyword lookup.

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