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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so safety is covered. The description adds genuine behavioral context beyond that: it discloses the payload contents (provenance fields, CUVEE, claim status, and a signed JWS record), which matters because there is no output schema.

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?

A single front-loaded sentence with the verb and key filter first, followed by a dense but relevant enumeration of returned fields. No wasted framing, though the semicolon-separated field list is slightly heavy to parse.

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 one-parameter read-only tool with no output schema, describing the return contents compensates well. It omits error behavior (invalid/unknown record_id) and auth expectations, which is the remaining gap for a lookup 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?

Schema coverage is 100% and the schema already documents record_id including its '<node>:<6 digits>' format. The description only restates 'by record_id', adding no new syntax, constraints, or failure semantics, so the 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 ('Read one product in full by record_id') and immediately enumerates what 'in full' means (every field with source page, reader, state, CUVEE, claim status, JWS). This is clearly a single-record fetch, distinguishable from list/query siblings such as search_drinks and compare_drinks.

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 never says when to reach for this tool versus search_drinks or any other sibling, nor does it state prerequisites (e.g., needing a valid record_id obtained elsewhere). Usage is only weakly implied by the verb 'Read one product'.

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