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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so safety is covered. The description adds a genuinely useful behavioral caveat beyond them: it does not include updates made after the page was loaded (読み込み後の更新は含みません). It does not mention truncation/pagination limits for very long pages.

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 is front-loaded in the first sentence, followed by usage and a caution, with no filler or repetition. Slightly prose-heavy for a one-parameter tool, but every sentence carries distinct information.

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?

An output schema exists, so return values need no explanation, and the description covers the remaining agent-critical gaps: what it returns, the precondition that the page is loaded, the freshness caveat, and which facts to verify before answering. Nothing needed to invoke it correctly is missing.

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 description coverage is 100%, so the single id parameter is already documented as accepting a search-result id, a URL, or a path, including Japanese characters. The description restates this almost verbatim and adds only that the id originates from search results, so 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: it returns the full body text of an already-loaded page on izakasu.jp, with concrete content types (持ち家の貸し方, 相続, 管理会社選び, 査定案内). The 'already-loaded page' scoping meaningfully separates it from the search siblings, though it never names which sibling to use instead (e.g. get_page).

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?

Explicit when-to-use: after finding an article via search, when you need to verify details such as fees, eligible properties, conditions, procedures, contract caveats and dates before answering. It gives no explicit when-not-to-use or named alternative, but the trigger condition is clear.

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