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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety and external-fetch profile is covered. The description adds that the result includes social links and recent articles, which is useful context, but it says nothing about auth needs, rate limits, pagination, or how many recent articles are returned. With annotations carrying the safety story, 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, front-loaded sentence that efficiently enumerates the profile contents with no wasted words. It is appropriately sized for a simple read tool, though the field list partly duplicates what the output schema already conveys.

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 spelled out, and annotations cover safety. The remaining gap is the unexplained 'url' parameter, which is the one thing an agent must get right to invoke the tool. Complete enough to call, but not fully self-sufficient.

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 single required parameter 'url' has zero schema description coverage and is never mentioned in the description. The agent is not told whether it should supply an author page URL, a profile slug, or an article URL that resolves to an author. This is a meaningful gap that the description does not compensate for.

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 specific resource (one CBR author's public profile) and enumerates what it contains: name, job title, headshot, biography, social links, recent articles. An agent can distinguish it from cbr_article, cbr_headlines, cbr_news and cbr_sections, which return different content. It stops short of an explicit verb like 'fetch/get' and does not name a sibling it is not, so it falls just under a 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 when-to-use guidance, no prerequisites, and no mention of alternatives. The description is purely a content inventory; the agent must infer that this tool is for retrieving an author profile. Nothing tells the agent when this tool is preferable to the article or headline tools.

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