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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint=false, so the safety profile is covered; the description adds real value by disclosing the returned structure and per-field `_provenance` metadata plus a citation obligation. It does not say what happens when the id does not exist, which is the main remaining behavioral gap.

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?

One tight sentence plus a short imperative about citing source_url; the payload list is front-loaded and every clause carries information an agent would otherwise have to guess.

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 usefully enumerates the return payload and provenance subtree, which is the right compensation. It falls short only on failure behavior for an invalid or missing id, minor for an idempotent read 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?

With one parameter at 0% schema description coverage, the description only restates that `id` is an integer, adding nothing about where the id should come from (e.g., a prior search result) or that it must be positive. The schema covers type and range, so the description neither compensates for the coverage gap nor contradicts 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?

"Fetch a full recall notice by integer id" gives a specific verb, resource, and key type, and the enumerated payload (products, parties with roles, hazard/remedy, provenance) tells the agent exactly what it gets. The word "full" implicitly contrasts with the narrower recalls_search sibling.

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: an agent can infer this is the drill-down call after recalls_search returns an id, but the description never states that sequencing or when not to use it. No explicit alternative is named despite recalls_search being the obvious one.

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