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

Annotations already declare readOnlyHint=true, openWorldHint=true, and idempotentHint=false. The description adds substantial context beyond that: the exact price, the product identifier, the USDC wallet-charging mechanism, budget-cap enforcement, and a prompt-injection caution about third-party data. This is rich behavioral disclosure for a paid 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?

Three front-loaded sentences with no padding: purpose first, then cost/payment, then a safety note. Efficient, though the pricing sentence is somewhat dense.

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 4-param read-only tool with no output schema, the description covers cost, safety, and lookup method, but leaves 'limit' semantics and the actual shape of returned CVE records underspecified. Adequate but with clear gaps.

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 50%, so the baseline of 3 applies. The description clarifies the id-vs-keyword split that maps to 'id' and 'q', and confirm_over_cap is well documented in the schema, but 'limit' remains undocumented in both the schema and the description.

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 and resource ('CVE records from the US National Vulnerability Database') and the lookup method ('by id or keyword'). The source is named precisely, which helps distinguish it from general search siblings, though it does not explicitly differentiate from other domain lookup tools like patent_lookup or company_lookup.

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 description implies usage ('by id or keyword') but offers no explicit when-to-use, when-not-to-use, or named alternatives among the many lookup siblings. The agent must infer that this is the CVE-specific tool.

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