Get Trending Subreddits

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

Annotations already declare readOnlyHint, but the description adds genuinely new context: the operation is anonymous (no auth needed) and it returns a {"data": [...], "after": cursor|null} envelope, which tells the agent how to paginate. It stops short of noting rate limits or throttling.

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 terse fragments with zero filler; the identity of the resource is front-loaded and the return shape follows. 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 no output schema present, the description steps in to describe the return envelope and the cursor, which is exactly what an agent needs for pagination. It omits secondary details like rate limits or ordering semantics, keeping it just short of complete.

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 both parameters (after, limit) are already fully documented with defaults and bounds. The mention of the "after" cursor confirms how pagination works but adds no detail beyond the 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?

States a specific verb+resource ("Currently popular subreddits") and anchors it to Reddit's /subreddits/popular listing, so an agent knows exactly what content comes back. It doesn't explicitly name a sibling it is not, but its listing/discovery role is distinct from browse_subreddit and get_subreddit_info.

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 when-to-use guidance and no named alternative. The agent must infer that this is a discovery tool rather than, say, search_reddit or browse_subreddit; no conditions for choosing between them are given.

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