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

With no annotations, the description carries the behavioral burden well by disclosing the x402 payment requirement, price, and the returned intelligence fields. It stops short of explicitly stating read-only behavior, side effects, rate limits, or error behavior.

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 purpose is front-loaded in a single dense sentence, and the price note is separate and direct. The output-field list is long but earns its place because there is no output schema.

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?

Because there is no output schema, it is useful that the description lists returned fields such as CVSS, CWE, KEV status, EPSS, and patch priority. It also explains payment, though it could say more about failure modes or sibling routing.

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 100%, so all five parameters are already documented in the schema. The description mentions severity, days, maxItems, and id/keyword lookup, but adds no meaningful syntax or semantic detail beyond the schema.

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 states a specific verb and resource: CVE lookup by exact id or NVD keyword search. It also exposes the main filters, but it does not differentiate this general lookup from siblings such as cve_kev or cve_packages.

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 identifies id-based and keyword-based modes, but gives no explicit guidance on when to use this tool versus cve_kev or cve_packages. There are no exclusions or routing hints for overlapping CVE-related siblings.

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