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 that sections come from two source types (editorial and RSS), a small but real behavioral detail beyond the annotations, though it says nothing about return format or count.

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 with no filler. It is telegraphic rather than a full sentence, but every word carries information about scope and consumer.

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 present and zero parameters, the description need not explain return values. It adequately conveys the resource and its purpose; the only minor gap is the absence of an explicit call-ordering hint relative to cbr_headlines.

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 tool takes zero parameters, so the baseline of 4 applies; there is nothing for the description to clarify about inputs.

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?

Identifies a specific resource (CBR sections) and scopes it precisely as 'public editorial or RSS sections', which distinguishes it from the sibling cbr_headlines/cbr_article tools. It lacks an explicit verb, but the resource and its relationship to cbr_headlines are unambiguous.

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 'accepted by cbr_headlines' implies the tool exists to supply valid section values for cbr_headlines, which is useful routing context. However, it never states when to call this versus cbr_headlines directly, nor any ordering prerequisite, so usage is only implied.

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