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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds a non-obvious behavioral quirk, that byline archives are partitioned per subdomain, which an agent could not infer from the annotations or schema. It stops short of describing pagination or return shape, but an output schema exists.

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, both load-bearing, with the core purpose front-loaded and the per-subdomain caveat second. No filler or repetition of schema content.

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 annotations, a full parameter schema, and an output schema present, the description only needs to add the non-structured gotcha. It supplies the per-subdomain partitioning rule, so an agent can call it correctly; richer detail (pagination across pages, result ordering) is left to the output schema.

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 both params are already documented, including the page-overrides-url behavior. The description reinforces that the url must be the section's own byline URL, adding marginal but not substantial meaning. Baseline 3 is appropriate when the schema does the heavy lifting.

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: 'One Philippine Daily Inquirer byline's public archive page: name and their recent articles.' It also names the scope (one byline, one subdomain), which separates it from inquirer_article, inquirer_headlines, and inquirer_news without opening any schema.

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?

The second sentence gives an explicit routing rule: an author's articles from a different section require calling this tool again with that section's byline URL. That is real when-to-use guidance, though it does not name sibling tools (e.g. when to prefer inquirer_article) as alternatives.

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