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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered externally. The description adds value by disclosing that results include both assigned and completed supplements (adherence status), which the annotations do not convey. It says nothing about history depth, missing-day behavior, or empty results.

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 efficient sentence with no filler, and the day-scoping qualifier is placed up front. Minor grammar awkwardness ('a student supplements') slightly hurts readability but not length.

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 no output schema, the description must convey what comes back; it does partially by noting both required and taken supplements. It does not say whether a supplement absent from the date is omitted or flagged, nor the shape of the response. Adequate but with a clear gap for a 2-required-param 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%: 'date' is documented as YYYY-MM-DD and 'studentId' points to list_students, so the schema carries the load. The description only implies that date scoping is the key parameter and adds no format or edge-case semantics. 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-resource pairing: it reports which supplements a student had to take on a given date and which were actually taken. That covers both the planned and completion aspects, which is more than a title restatement. It does not name or differentiate from the sibling list_student_supplements, so it falls short of a 5.

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 statement of when to use this versus list_student_supplements, which clearly covers the same supplement domain. The per-day framing is only implicit in the word 'on a date'. No prerequisites, no exclusions.

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