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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds that the article is 'public', hinting no auth is required and only public content is reachable, but says nothing about rate limits or failure modes; with an output schema present, the content composition note ('metadata and body paragraphs') is largely redundant.

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?

Three tight sentences, front-loaded with the core action and followed by routing hints; every sentence earns its place with no filler or repetition.

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?

Output schema exists so return values needn't be explained, and annotations cover safety, leaving little for the description to carry. It is nearly complete, only omitting orientation toward the remaining livescience siblings, which is a minor gap for a single-param fetch tool.

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% with one parameter, so the baseline is 3. The description implies a single article per call ('one ... article's') but adds no URL format, canonicalization, or error semantics beyond what the schema's 'Canonical Live Science article URL' already states.

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 ('Fetch one public Live Science article') and names the deliverable content ('metadata and body paragraphs'). It also distinguishes itself from the two most likely confused siblings, livescience_headlines and livescience_news, so an agent can route without opening schemas.

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 explicit routing for two alternatives ('Use livescience_headlines to discover story cards', 'Use livescience_news for the general news feed'), which is clear context. It lacks an explicit 'when to use this tool' clause and does not address other siblings like livescience_author or livescience_sections, so it is clear but not fully enumerated.

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