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 shape of the result (name, bio, recent articles), which is useful context beyond annotations, but says nothing about how many articles are returned, pagination, or lookup failure behavior.

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 compact sentence with the resource front-loaded and zero filler. Efficient, though it spends its words on return fields rather than the missing parameter guidance.

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 not be explained, and the annotations carry the safety profile. The remaining gap is that neither the description nor the schema explains how to identify the contributor, leaving two required-in-practice parameters ambiguous.

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?

Both parameters (url, slug) have 0% schema description coverage and the description never mentions them. It does not explain that the author is identified by a URL or slug, nor the relationship between the two, so the schema gap is not compensated.

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+resource: returns one Foreign Policy contributor's public profile, enumerating the payload (name, bio, recent articles). The foreignpolicy_ prefix and 'author' vs 'article'/'headlines' siblings make the target clear, though it never explicitly contrasts with those siblings.

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?

No when-to-use guidance and no mention of alternatives such as foreignpolicy_article or foreignpolicy_headlines. An agent must infer that this tool is for author lookups and that one of url/slug is needed to select a contributor.

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