reddit_subreddits_popular

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

Annotations already establish read-only and non-destructive behavior. The description adds valuable context about the return shape (subreddits list with specific fields) and the pagination cursor mechanism, enhancing transparency beyond what annotations provide.

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 succinct sentences: purpose, return format, and sibling-tool distinction. No filler, front-loaded with the core action, and every sentence adds unique value.

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 simple read-only browsing tool with two optional parameters and no output schema, the description covers purpose, return fields, pagination, and usage guidance. It is complete and self-sufficient for an AI agent to select and invoke correctly.

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 description coverage is 100%, so the schema fully documents both `after` and `limit` with detailed descriptions. The tool description only repeats the `after` cursor concept without adding new semantics, so a 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 uses a specific verb ('Browse') with a clear resource ('most-subscribed, trending subreddits'), explicitly noting no keyword is needed. It also distinguishes this tool from reddit_search_communities (search by keyword), making the purpose unambiguous.

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?

It clearly states when to use this tool (browsing by popularity, no keyword) and explicitly names reddit_search_communities as the alternative for keyword search. Pagination behavior via the `after` cursor is also mentioned, giving concrete usage context.

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