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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, open-world). The description adds genuinely new behavior: the job runs asynchronously, the same call both reports state and yields the population result once finished, and no API key is required. It does not mention polling cadence or task-id expiry, which keeps it out of the top band.

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 sentences plus a one-word auth note, with the purpose and then the workflow condition front-loaded. Nothing is repeated and every clause carries information an agent needs to invoke the tool correctly.

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, the description carries the return-value burden well: it explains that the response is a state and, once the job finishes, the population result. The async lifecycle and keyless access are covered, leaving only minor operational details (retry cadence, id lifetime) unstated.

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?

Only one parameter and schema coverage is 100%, so the schema already documents taskid and its origin. The description adds a small amount of meaning by tying the id to the runasync mode of worldpop_stats_polygon, but that is edge-level detail rather than real semantic enrichment.

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 pair (check or collect) plus the resource (a WorldPop stats job) and the identifier used to address it (task id). It also implicitly separates itself from the sibling worldpop_stats_polygon, which is described as the producer of the task id rather than the retriever of results.

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 says when to call it: pass the taskid returned by worldpop_stats_polygon when that call used runasync. That gives the agent the triggering condition and names the prerequisite tool. It stops short of stating when the tool is unnecessary (e.g. synchronous calls return results directly).

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