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

Annotations already declare readOnly, idempotent, non-destructive and open-world, so the safety profile is covered. The description adds genuinely non-structured context: that descriptions/URLs are untrusted third-party data and never instructions, plus the CPE naming convention for vendor/product values — real behavioral guidance beyond the annotations.

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 compact sentences: the capability and its payload are front-loaded, then the trust/CPE caveats follow. No filler, and each clause carries a distinct instruction.

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?

With rich annotations, a complete input schema, and an output schema that already defines return values, the description covers the remaining gaps an agent needs: the untrusted-data caveat and CPE semantics. Nothing essential is missing for a single-resource read.

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% and the single `id` parameter is fully documented with accepted formats, case, and whitespace handling. The description adds nothing beyond that for the parameter, 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 and resource ('Get one CVE's full detail') and enumerates the returned content (CVSS, weaknesses, references, products, versions, EPSS, KEV), which cleanly separates it from the plural sibling search_cves. An agent knows immediately this is the single-record fetch, not a query.

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?

Usage is only implied: you supply an ID and get the full record. The one explicit routing hint ('use find_product before filtering searches') is guidance for the search tools rather than for this lookup, and no alternative such as search_cves or cve_highlights is named as the way to obtain an ID.

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