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

Annotations already declare readOnlyHint and openWorldHint, and the description adds genuinely new context: data is credential-free public data and upstream comment bodies are not exposed. The latter is a real capability boundary an agent needs to know. It does not cover pagination or freshness limits, keeping it below a 5.

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 core purpose is front-loaded in the first sentence, and the data-source caveat follows logically. The limit clause is redundant with the schema and slightly bloats the description, but overall it is tight and readable.

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 handling return values and annotations covering the safety profile, the description supplies what remains: selection logic, ordering, data provenance and the comment-body limitation. It is nearly complete, missing only pagination/freshness behavior.

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%, so both parameters are already documented. The description merely restates the limit parameter (default 10, max 25) and adds nothing about the optional topic slug, so it provides no meaning beyond the schema — baseline 3 applies.

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 (Returns) and resource (normalized Metaculus question rows) with the exact selection criterion — questions referenced by the most recent public comments — and the ordering (comment recency). It also differentiates itself from the sibling metaculus_top_comments by name, so an agent can route between them without opening schemas.

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?

The closing sentence explicitly routes the agent to the alternative ('Use metaculus_top_comments to retrieve metaculus top comments feed'), giving a clear when-to-use-other signal. It stops short of stating the inverse condition (when to prefer this feed over top_comments), so it is strong but not fully symmetric.

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