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

Annotations already declare readOnlyHint=true and openWorldHint=false, but the description adds real behavioral detail: the default ordering is featured-stories-first rather than newest-first, the default page size is 5, and the returned fields are enumerated. It stops short of any rate-limit or pagination caveats.

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?

Front-loaded with the core action and source, then layers defaults, ordering, and return shape in a logical order. Slightly long with several illustrative examples, but each sentence carries usable information.

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 no output schema, the description compensates by describing the return payload (5 articles, each with headline, summary, date, age, link) and the ordering semantics. The only meaningful omission is the category filter, one of five parameters.

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 coverage is 100%, so the baseline is 3, but the description adds value beyond the schema by translating intent into parameters ("set by_date to true for strictly newest first", "use from/to for a specific period, e.g. 'news from last week'"). The category parameter is never mentioned in the description, leaving that gap to the schema alone.

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 and resource ("Get the latest crypto news from Cryptowisser") with a clear source. However, it never distinguishes itself from siblings like trending-stories or search-news, so an agent must infer the boundary between "latest" and "trending" or "search" on its own.

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?

Provides concrete triggering examples ("What's the latest crypto news?", "news from last week") and explains which parameter selection follows from each intent. It does not state when to prefer search-news or trending-stories instead, so alternatives are left implicit.

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