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

With no annotations provided, the description carries the full behavioral burden and does reveal important traits: the call costs $0.02 via x402/USDC on Base, and the response includes a provenance chain and Ed25519 attestation. It does not mention read-only status or rate limits, but the payment and response-evidence behavior is meaningfully disclosed.

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 with no filler: the first states the core purpose and aggregation, and the second adds essential cost and response-evidence details. The highest-value information is front-loaded.

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?

Given the tool's simplicity—one optional parameter and no output schema—the description covers source, aggregation, cost, and response attestation. It could be more explicit about the exact date window or return shape, but those are minor omissions for a daily summary tool.

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?

The single payment parameter is already fully described in the schema, including the omit-to-get-a-quote behavior, so the baseline is 3. The description adds the dollar amount and settlement network, which complements the schema without needing to repeat it.

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 a specific resource (NVD CVEs published per day) and a specific action (counting by CVSS severity band). It is clearly distinguishable from siblings like cve_detail_lookup and kev_status_by_cve, which operate on individual CVEs or KEV status rather than aggregate daily summaries.

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?

The intended use is implied by the description: use this when you need a daily aggregate of published CVEs segmented by severity. However, there is no explicit when-to-use or when-not-to-use guidance, and no alternative sibling tools are named.

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