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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=false, so safety and idempotency are covered. The description adds that the record includes recalls, which hints at composite content, but says nothing about the point-in-time behavior (as_of snapshots) or what happens with unknown/expired ids. With annotations doing the safety work, a 3 is appropriate.

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 sentence that front-loads the verb+resource and then lists the returned fields. No wasted words, and the most important scoping information ('full record') comes first.

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 simple two-parameter read tool with rich annotations and a full schema, the description covers what it returns. However, without an output schema, it gives no sense of return shape or size (how deep the nested record is), and it omits the as_of snapshot semantics that the schema only briefly hints at. Adequate but with clear gaps for an agent deciding coverage.

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 both parameters (id, as_of) are documented in the schema, including format hints. The description restates the id as 'Pillwise drug id' but adds no new meaning beyond the schema, 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 ('full record for a Pillwise drug id') and enumerates the contents returned (names, ingredients, form, strength, packages, recalls). This clearly distinguishes it from siblings like get_packages, get_form_options, or list_recalls, which return subsets.

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?

No explicit guidance on when to use this tool versus alternatives. The sibling tools get_packages, get_form_options, and list_recalls cover overlapping data, but the description doesn't say to prefer get_drug for a complete record or when to use the narrower siblings instead. Usage is only implied by the word 'full'.

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