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

No annotations are provided, and the description does not disclose any behavioral traits such as the output format, limitations, or what happens with the query. The tool's behavior is completely opaque beyond the vague hint of comparing coverage.

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 brief (five words) but takes the form of a question rather than a clear instruction. It is underspecified and fails to communicate the tool's function effectively, making it an ineffective use of concise wording.

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 a simple one-parameter schema and no output schema, the description still fails to explain what the tool returns or how it operates. It is more complete than a tautology but far from adequate for an agent to use it reliably.

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 schema covers the only parameter 'query' with a description, so the parameter semantics are already documented. The description does not add any additional meaning beyond the schema, so the baseline of 3 is appropriate.

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 hints at the tool's purpose by saying 'How different news sources cover the same story,' but it lacks an explicit action verb like 'compare' or 'show.' It is a vague phrase rather than a clear verb+resource statement, and it does not differentiate from sibling tools such as related_queries or topic_deep_dive.

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?

There is no guidance on when to use this tool versus alternatives. The description does not mention any use cases, prerequisites, or exclusions, leaving the agent to guess when this comparison tool is appropriate.

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