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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds modest context beyond that: 'Current' signals freshness, and 'one public section' signals the result is scoped to a single section rather than the whole site. Return shape and pagination are left unexplained (though an output schema exists).

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 verb+resource, with the scoping and prerequisite constraints appended. No filler text.

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 one-param read tool with an output schema and safety annotations, the description covers what the tool returns conceptually and how to supply a valid section. Only the exact section-value format is missing.

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% for the single required 'section' param, so the description must carry the meaning. It partially does by naming dailystaruk_sections as the authoritative source of valid values, but gives no format, casing, or example of a section identifier.

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 headlines) scoped to 'one public section', which lets an agent separate it from dailystaruk_article (single article) and dailystaruk_news. It does not explicitly contrast with dailystaruk_news, so sibling differentiation is implied rather than stated.

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' is an explicit prerequisite that routes the agent to the sibling it must call first to obtain valid values. It stops short of a 5 because it never states when this tool should be skipped in favour of dailystaruk_news or dailystaruk_article.

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