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

Annotations already declare readOnlyHint and openWorldHint. The description adds that results are 'current' and limited to 'one public section', which is useful scope context but not deep behavioral detail such as rate limits, auth needs, or result-shape notes.

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?

One sentence, front-loaded with the purpose and then the parameter constraint. No filler or redundancy.

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?

For a simple one-parameter read tool with an output schema and annotations covering safety, the description covers purpose and the key parameter source. It leaves minor ambiguity about how it differs from gbnews_news, but that is a small gap for a low-complexity 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%, so the schema only says the parameter is a string. The description compensates by stating the section must come from gbnews_sections, telling the agent where to obtain valid values, though it does not specify the identifier format.

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 resource (GB News headlines) and scope (current, one public section). It routes the agent to gbnews_sections for valid section values, but does not explicitly distinguish itself from gbnews_news or gbnews_article, which keeps it from 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?

Gives one prerequisite: 'section must come from gbnews_sections.' That is useful routing, but it offers no guidance on when to choose this tool over sibling gbnews_news or gbnews_article, so usage is implied rather than explicit.

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