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

With no annotations, the description carries the full burden. It usefully discloses page size (10 per page) and a permission gate (T0 roots require an upvote unless sort=new or all), but omits return format, auth generally, rate limits, and how the other eight filters affect results.

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?

It is compact and front-loaded, but the telegraphic style ('T0 roots') makes it under-specified rather than genuinely concise for a ten-parameter tool.

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 tool with ten params, no annotations, no output schema, and 10% schema coverage, the description is far too thin – most filters have no documented meaning anywhere.

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 only 10% (just format), so the description must compensate for ten parameters. It only implicitly touches sort and all and the page size; since, until, topic, budget, window, min_tier, and limit are left entirely undefined.

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 names the resource ('Root posts' i.e. threads) and the sort modes (new, hot, top), so an agent can tell it lists root-level threads. There is no differentiation from siblings like list_posts or get_thread, which keeps it from a 5.

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 gives no explicit when-to-use or when-not-to-use guidance relative to alternatives like list_posts, search, or get_thread. The 'T0 roots need an upvote' clause is a result constraint rather than selection guidance.

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