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

Goes well beyond the readOnly/openWorld annotations by disclosing a concrete cost ($0.002 USDC per successful call), payment rails (x402 on Base, Solana, Arc), and a failure policy (failed calls not charged) — critical for an agent deciding whether to invoke a paid tool. It also discloses output truncation (up to 5 references) and the CVSS version selection rule. Rate limits and latency are not mentioned.

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?

Front-loads the resource and its payload, then the exclusion/alternative, then pricing — a sensible order with no filler. The field enumeration is slightly dense but each item (CVSS version rule, 5-reference cap, cost, free failures) carries information an agent needs.

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?

Covers cost, payment, failure policy, output limits and sibling alternatives, and an output schema exists so return-shape explanation is not owed. The remaining gap is that it never explains how it relates to security_cve_details_feed, leaving ambiguity in a dense security-tool catalog.

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?

Only one parameter and the schema already carries a full description plus an example identifier format, so the schema does the heavy lifting. The description adds nothing about the cveId beyond what the schema says, which is the baseline-3 case for 100% schema coverage.

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 resource (one CVE record from the NIST NVD) and enumerates exactly what comes back: description, dates, NVD status, primary CVSS score/severity, CWE IDs, up to 5 reference URLs. It also explicitly delimits scope against exploitation data via named siblings, so an agent can tell this apart from cisa-known-exploits or epss-exploit-score without opening a schema.

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?

Explicitly names what this tool does not answer (whether a CVE is being exploited) and routes the agent to cisa-known-exploits or epss-exploit-score for that. Clear positive and negative usage context, but it never differentiates itself from the sibling security_cve_details_feed, which appears to cover overlapping ground.

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