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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered; the description adds real behavioral context on top — that the returned directory is complete and current rather than a filtered page, and that 'q' matches locally against topic metadata instead of triggering a remote fetch. The explicit exclusion of article bodies prevents a common false expectation.

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 sentences, no filler, with the scope and the returned field list front-loaded and the negative constraint ('article bodies are not returned') placed last as a boundary check. Every clause carries information.

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 an output schema present, the agent does not need the description to explain return shape, so the field enumeration is mildly redundant but harmless. The key gaps left open are pagination/size limits on a 'complete current topic directory' and the Query naming/required ambiguity; neither is fatal for a read-only lookup 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 coverage is 100% and the schema already documents the search as case-insensitive substring over title, description and slug with a 100-character cap, so the structured field does most of the work. The description contributes only the 'local' search qualifier, which adds a little beyond the schema. It also uses 'q' while the parameter is named 'Query', and the schema marks Query required while its own description calls it optional — the description does not reconcile either point.

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?

A specific verb ('Returns') plus an explicit resource ('News sections and the complete current topic directory from Cricbuzz'), followed by an enumeration of the fields returned (title, slug, description, URL, premium flag). The closing clause 'article bodies are not returned' draws a hard boundary against the article/headline siblings, so an agent can pick between them without opening either 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?

Clear context for use: browse News sections plus the full topic directory, with 'q' as a metadata-only filter. It also rules out a class of expectation by stating article bodies are excluded, which implicitly routes the agent elsewhere for content. It stops short of naming the sibling tool to use instead (e.g. cricbuzz article/fetch), so there is no explicit alternative.

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