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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safe, open-web read nature is covered. The description adds the constraint that the section value must originate from dailystaruk_sections, but nothing about freshness, pagination, or result volume.

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 compact sentence front-loads the resource and scope, then appends the one constraint that matters. No filler and nothing to trim.

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 handling return values and annotations covering the safety profile, the description supplies what an agent needs: the resource, the scope, and where valid section values come from. Only minor behavioral detail is absent.

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 enumerates all documented section slugs, so the description adds no syntax beyond what the schema provides. Pointing to dailystaruk_sections as the authoritative source is mildly useful but redundant with the schema list.

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 (headlines) and resource (Daily Star UK), scoped to 'one public section'. It names dailystaruk_sections as the source of valid sections, which helps separate it from the article/news siblings, though it does not explicitly contrast headlines vs. dailystaruk_news.

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 clause 'section must come from dailystaruk_sections' gives an explicit prerequisite that routes the agent to the sibling tool first. There is no explicit when-not guidance, but the context for correct use is clear.

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