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 one genuinely useful behavioral detail beyond that: the response bundles profile data with the author's recent articles, which signals a composite result. It says nothing about pagination, freshness, or authentication, so with annotations carrying the rest, a 3 is appropriate.

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 sentence that front-loads the resource ("One Collider author's public profile") and then enumerates the returned fields. There is no filler; every clause earns its place.

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 the return shape need not be re-explained and the field list is a reasonable preview. However, the only input parameter is undocumented and there is no hint about where the URL comes from, which is a real gap for a single-required-param tool.

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% and there is one parameter, "url", which the description never mentions. The sole input is undocumented in both the schema and the prose, leaving the agent without the expected format (author page URL vs. handle vs. ID) or validity constraints. This is below the 3 baseline because the description does not compensate for the coverage gap.

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 states precisely what the tool returns: a single Collider author's public profile plus the fields it contains (name, job title, headshot, biography, social links, recent articles). That distinguishes it well from collider_article/collider_headlines, which return editorial content rather than a person. It stops short of explicitly contrasting itself with any sibling tool, so it lands at 4 rather than 5.

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?

There is no statement of when to use this tool, no mention of the alternative author-related tools, and no clue about how to obtain the required URL or whether it must be a Collider author page. The agent is left to infer the entire invocation context from the name alone.

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