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

With no annotations, the description carries the behavioral burden and does disclose an important access constraint: the tool is paid and requires an AIS Gateway key or x402 payment. However, it does not disclose return format, failure behavior, or rate limits, so coverage is partial.

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?

A single dense sentence front-loads the payment requirement before stating the data scope. Every clause contributes useful information with no waste.

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 zero-parameter list tool, it clearly states source, freshness window, completeness, and included ranks. The main gap is that 'AIS ranks' is undefined and no output schema describes the return shape, but this is minor given the tool's simplicity.

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?

There are zero parameters and the schema is empty with 100% coverage, so the description has no parameter burden. The baseline of 4 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?

The description identifies a specific resource: CVEs newly added to CISA KEV in the last 7 days, described as a complete catalog with AIS ranks. It lacks an explicit verb like 'returns', but the scope is unambiguous and distinct from sibling tools such as top_cves_today.

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 explicit guidance on when to use this tool instead of siblings like cve_verdict or top_cves_today. The 'complete catalog' and 7-day window hint at relevance, but the agent must infer when this tool is preferred.

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