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

Annotations already declare readOnly (safe) and openWorld (non-deterministic). Description adds that results are sorted by recency. Beyond that, no additional behavioral traits (rate limits, auth) are disclosed.

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 sentences, front-loaded with action and output. Efficient and no superfluous content, though could be slightly more compact.

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?

Adequately covers purpose, usage context, and return fields for a simple search tool. No output schema but description lists fields. Missing details like language/region filters but not critical for basic use.

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% and description largely restates schema parameter descriptions without adding new meaning. Baseline 3 is appropriate as no extra value beyond 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?

Clearly states it queries Google News for articles matching keywords, listing returned fields. Differentiates from siblings (specific sources) implicitly as a broader aggregated search, but does not explicitly contrast.

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?

Recommends use for targeted research on topics/people/events. Does not specify when not to use or mention alternatives, though sibling tools imply specific source constraints.

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