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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds real value beyond that by disclosing the return payload structure and the source_url/url linkage on each story — important since there is no output schema. It stops short of mentioning auth needs, rate limits, or latency.

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 routing directive, then payload contents, then the exclusion — a sensible order with no wasted sentences. It is on the longer side and the run of four parallel example questions is slightly heavier than needed, but each element earns its place.

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 correctly takes on the burden of describing what comes back and how deep the response goes. Annotations cover safety, so the remaining gap is operational (pagination or result capping on the storylists), which is a minor omission for an otherwise complete definition.

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%, so the schema already documents place formats, topic slugs, detail defaults, window values, language codes, and radius defaults. The description's example queries illustrate place scope implicitly but add no format or constraint details beyond the schema, so the baseline 3 applies.

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?

Names a specific verb and resource (retrieve news for a place or the world) and enumerates exactly what comes back: ranked top stories, storylines, live conditions, and a place profile. It also explicitly distinguishes itself from get_location, so an agent can route without opening either schema.

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?

Opens with an explicit priority directive ("Use first for the news in a place or the world") and supplies four example queries that map to distinct parameter configurations. It names the alternative (get_location) and the exact condition that selects it ("what a place is rather than its news").

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