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

This is the description's strongest contribution: it discloses that the call returns null domains plus a review object, and that the review's data date is the layer's window end. That prevents an agent from misreading a null result as an error or as an empty result. The reason for withholding (false positives in open countries, stricter rule being rebuilt) adds useful trust context beyond the readOnly/openWorld annotations.

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 critical state ('Under review') is front-loaded, and the rest explains cause and effect in two compact sentences with no filler. The middle clause about false positives in open countries is slightly dense but earns its place as justification.

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 does the right thing by describing the actual return shape (null domains + review object + data date). What's missing is what an agent should do instead to obtain a comparable ranking, and whether a limit/category call has any effect while withheld. Adequate but with a clear routing gap for a tool that currently returns nothing.

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% and both parameters (limit, category) are documented in the schema. The description adds no parameter-level information, such as whether limit or category still apply given the withheld state. Baseline 3 applies when the schema carries the parameter burden.

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 specific resource and metric: a global ranking of domains by how many countries block them nationally, sourced from Voidly's national blocklist layer. It also states the tool is currently withheld, which is the essential fact about what it returns. It doesn't explicitly contrast with near-siblings like get_most_censored or get_national_blocklist, keeping it short of 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?

Implicit guidance comes from 'the ranking is withheld', which tells an agent not to call this expecting usable domain data, and the 'under review' framing implies deferring to another tool. However, no alternative is named for getting blocked-domain rankings and no condition for when calling is still worthwhile (e.g. to check review status) is stated.

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