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 cost ($0.01/call via x402, USDC on Base) and response traits (provenance chain, Ed25519 attestation), which are real behavioral value-adds. However, it doesn't describe what the summary actually contains beyond the severity bands, or any output shape, leaving meaningful gaps for a zero-annotation tool.

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 tight sentences with zero filler; the core purpose is front-loaded and the payment/attestation context follows. Every clause carries information.

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?

No output schema and no annotations, so the description must do heavier lifting, and it does cover purpose, cost, and response attestation. It is slightly silent on the output shape (what the severity-band counts look like) and any time-window semantics, but for a no-required-param summary tool it is largely sufficient.

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% for the single optional 'payment' parameter, and the schema itself explains the x402 header and free-quote behavior. The description adds no further parameter meaning, so baseline 3 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?

States a specific verb+resource+scope: 'CVEs published per day from the NVD feed, counted by CVSS severity band.' The aggregation-by-severity semantics clearly distinguish it from cve_detail_lookup and kev_status_by_cve, though it doesn't name those siblings explicitly.

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?

No when-to-use or when-not-to-use guidance is given, and no alternative tools are referenced. An agent must infer from the name/description that this is for aggregate daily counts rather than per-CVE detail. Sibling tools like cve_detail_lookup make a routing note genuinely useful here.

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