get_trending_subreddits

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

Description adds valuable behavioral context beyond the readOnlyHint and openWorldHint annotations: it explains the cached, time-varying nature of results and that it works anonymously. No contradiction with annotations.

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 focused sentences: the first states the purpose and behavior, the second gives alternative guidance. No filler, front-loaded and efficient.

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?

For a parameterless, read-only tool with no output schema, the description fully conveys what it returns (a list of subreddit names), its dynamic nature, and its constraints. It is complete for the tool's simplicity.

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?

With zero parameters, the description correctly notes 'no parameters,' which covers the empty schema. The baseline of 4 is appropriate since there is nothing to add semantically.

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?

Description clearly states the tool gets currently trending subreddits, using a specific verb and resource, and distinguishes itself from search_reddit by contrasting trend-based vs keyword-based retrieval.

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?

Explicitly states it works anonymously and is read-only, and provides a clear alternative ('use search_reddit with type='sr'') for keyword-based needs, making the when-to-use decision unambiguous.

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