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

Annotations already declare readOnlyHint=true and openWorldHint=false, so 'Read-only' is redundant, but the description adds substantial non-annotation context: the Bearer-key auth requirement and exactly what free users receive (headline, first steps, sources) versus subscribers (patch status, fixed version, affected check, verification, matching kit). That gating behavior is not derivable from structured fields.

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 tight sentences, front-loaded with the core action and then the tiered content breakdown. The parenthetical feature list is dense but every item carries information; nothing is filler.

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?

There is no output schema, so the description must explain what comes back, and it does so concretely for both free and subscriber tiers. The remaining gap is the id's origin/format, which an agent would need before it can call the tool successfully.

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 0% for the single required 'id' parameter, and the description adds no meaning beyond the word 'id' – it never says what an advisory id looks like, where to obtain one, or whether it must come from a search result. With low coverage the description is expected to compensate and does not.

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 advisory by id'), and 'one ... by id' implicitly distinguishes it from the list/search siblings like search_advisories and get_cyber_advisories. It does not name an alternative explicitly, so sibling differentiation is inferential rather than stated.

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 makes it clear you call this when you have a specific advisory id, and it discloses the free-vs-subscriber split, but it never says when to prefer this over search_advisories or get_cyber_advisories. Usage is implied rather than guided.

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