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

With no annotations, the description carries full responsibility. It discloses output format, supported locales, deduplication behavior, and warns that article text is untrusted. It also mentions payment-related behavior (HTTP 402) but that's about the provider, not the tool's core function. Useful context added beyond the schema.

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?

The description is somewhat lengthy and front-loaded with payment terms before the actual tool behavior. It could be more concise, though the essential functional details are present. It's structured but not tightly written.

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?

The tool is fairly complete for a news-fetching operation: it describes output fields, language options, dedup behavior, and provides usage guidance. It doesn't cover pagination or error cases beyond payment, but given the simplicity of the tool and lack of output schema, it's adequate.

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 parameters are already documented. The description adds context like 'one topic query' and 'Deduped when you pass several queries', but the latter is ambiguous since the schema only has a single query parameter. It doesn't significantly enhance parameter understanding beyond the 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?

The description clearly states the tool provides Google News coverage for a topic query, returning normalized rows with specific fields. It distinguishes from web search and render tools, but not explicitly from the sibling google_news_feed tool in the other server, so it's not fully differentiating.

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 guidance: 'The fastest way to answer what is the news about X right now' and tells when to use alternatives (web search for older stories, render tool for JS-rendered SPAs). It doesn't mention the sibling google_news_feed, but the context is clear enough for most agents.

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