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 the returned field set, but says nothing about pagination, how many 'recent articles' are returned, or failure behavior for non-canonical URLs.

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?

A single front-loaded sentence that packs the verb, resource, input constraint and return fields with no wasted words.

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-parameter read-only lookup with an output schema already defining the response shape, the description is nearly sufficient; it only lacks guidance on URL form and result limits, which for this simple a tool is a minor gap.

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 0% with a single undocumented 'url' parameter, so the description must carry the load. It does add one meaningful qualifier, 'canonical author URL', which steers input selection, but gives no format example or error behavior for malformed URLs.

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 (returns) and resource (Irish Times author profile), enumerating the fields delivered: name, job title, biography, headshot, contact details, recent articles. The resource is clearly distinct from irishtimes_article/headlines/news siblings, though it never names them explicitly.

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 phrase 'from a canonical author URL' implies the input must be an author-page URL rather than any arbitrary link, which is an implicit usage hint. However, there is no explicit when-to-use guidance, no statement of alternatives for finding an author, and no prerequisites.

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