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

With no annotations, the description does real work: it discloses that results are limited to titles and links (not full articles), that only three named outlets are covered, and that freshness is capped by a 7 a.m./7 p.m. Hawaiʻi-time refresh cycle — so an agent knows it cannot retrieve older or full-text news here. It stops short of any failure-mode or rate-limit context.

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?

Two short sentences with zero waste. Content and sources are front-loaded, with the cadence detail placed second as supporting context.

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 zero-parameter tool with no annotations and no output schema, the description supplies everything needed: what comes back (titles and links), from where, and how fresh it is. Nothing required to call it correctly 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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. The description correctly does not invent filtering options such as topic or source selection, matching the empty schema.

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 (today's Hawaiʻi news headlines, titles and links) and names the three exact sources: Hawaii News Now, KHON2 and Civil Beat. An agent can immediately tell this apart from get_hawaii_alerts, get_hawaii_weather and search_hawaii without inspecting any 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?

The word 'Today's' plus the twice-daily update cadence implies the use case (current headlines), but the description never states when to prefer this over search_hawaii for older stories or list_hawaii_topics. Usage is implied rather than guided, and no alternatives are named.

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