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 enumerates returned fields, which is useful but largely mirrors the output schema, and it discloses nothing about pagination, rate limits, or how 'recent articles' is bounded. Adequate but not rich.

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 tight sentences with zero filler; the purpose and the field list are front-loaded before the sibling pointer.

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 an output schema explaining return values and annotations covering safety, the description needs only to establish scope and routing, which it does. The one small gap is any note on how the author URL is obtained or how 'recent' articles are limited, but that is minor for a single-param read 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 100% and the schema already states 'Canonical CBR author URL', which the description repeats verbatim. No added syntax, format, or lookup guidance is provided, so the baseline 3 applies.

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 ('Fetch') and resource ('CBR author's public profile') and enumerates what the profile contains (name, job title, headshot, biography, social links, recent articles). It also names the sibling cbr_article and what that tool does instead, so an agent can distinguish the two without opening either 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?

Explicitly routes the agent away from this tool when it wants a single story's content ('Use cbr_article for one story's content'). It gives a clear use context (author profile aggregation) but offers no exclusions or caveats beyond the one sibling pointer.

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