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

No annotations are supplied, so the description carries the behavioral burden. It discloses the main behavior (the full page body is returned), but it doesn't specify response format, errors, or access assumptions. This is adequate for a simple read tool but not rich.

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 compact sentences, each earning its place: the first states the core behavior, the second states the usage context. No filler or repetition.

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 single-parameter read tool with no output schema, the description covers what is returned, the source of the URL, and when to call it. It could be more complete by mentioning output format or failure behavior, but nothing essential is missing for a straightforward call.

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?

The schema already covers the url parameter 100%, so the baseline is 3. The description adds context that the URL should be for pages found via search_pages and that it contains work details, giving the parameter a purpose beyond its raw syntax.

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?

The description names a concrete operation: returns the body text of a page from start to finish ('「慈」のページの本文を、最初から最後まで返します'). It also ties the tool to a specific use case, reading details of works found via search_pages, which distinguishes it from siblings like search_pages and list_pages.

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?

It explicitly states when to use it: 'search_pages で見つけた作品の説明・サイズ・価格や、販売の条件をくわしく読むときに使います'. It doesn't enumerate when-not-to-use or mention list_pages/site_overview as alternatives, so it falls just short of full guidance.

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